Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Appointment	C	0..*	Appointment	A booking of a healthcare event among patient(s), practitioner(s), related person(s) and/or device(s) for a specific date/time. This may result in one or more Encounter(s) Constraints: app-2, app-3, app-4, patient-or-data-absent-reason
meta	Σ	1..1	Meta	Metadata about the resource
source	ΣC	1..1	uri	HPI Facility ID from where the record is sourced Constraints: hpi-location-url-format
Slices for tag	Σ	1..*	Coding	Tags applied to this resource Slice: Unordered, Open by value:system Binding: CommonTags (example): Codes that represent various types of tags, commonly workflow-related; e.g. "Needs review by Dr. Jones".
tag:correlationId	Σ	1..1	Coding	Tags applied to this resource Binding: CommonTags (example): Codes that represent various types of tags, commonly workflow-related; e.g. "Needs review by Dr. Jones".
system	Σ	1..1	uri	Hub correlation ID system Required Pattern: https://hub.services.digital.health.nz/ns/correlation-id
code	Σ	1..1	code	Symbol in syntax defined by the system
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
modifierExtension	?!	0..*	Extension	Extensions that cannot be ignored
identifier	Σ	0..1	Identifier	External Ids for this item
use	?!Σ	0..1	code	usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .
system	Σ	1..1	uri	The namespace for the identifier value Example General: http://www.acme.com/identifiers/patient
value	Σ	1..1	string	The value that is unique Example General: 123456
status	?!Σ	1..1	code	proposed | pending | booked | arrived | fulfilled | cancelled | noshow | entered-in-error | checked-in | waitlist Binding: AppointmentStatus (required): The free/busy status of an appointment.
reasonCode	Σ	1..*	CodeableConcept	Coded reason this appointment is scheduled Binding: NZ Appointment Reason Codes Code System (required)
supportingInformation		1..1	Reference(Organization)	The provider organisation that owns this appointment
type	Σ	1..1	uri	Type the reference refers to (e.g. "Patient") Binding: ResourceType (extensible): Aa resource (or, for logical models, the URI of the logical model). Required Pattern: Organization
identifier	ΣC	1..1	Identifier	Logical reference, when literal reference is not known Constraints: hpiOrganizationIdPattern
use	?!Σ	0..1	code	usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known . Required Pattern: official
system	Σ	1..1	uri	The namespace for the identifier value Required Pattern: https://standards.digital.health.nz/ns/hpi-organisation-id
value	Σ	1..1	string	The value that is unique Example General: 123456
created	C	0..1	dateTime	The date that this appointment was initially created Constraints: full-datetime-with-timezone
Slices for participant	C	1..*	BackboneElement	Participants involved in appointment Slice: Unordered, Open by pattern:actor.type Constraints: app-1
participant:All Slices				Content/Rules for all slices
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
status	Σ	1..1	code	accepted | declined | tentative | needs-action Binding: ParticipationStatus (required): The Participation status of an appointment.
participant:patient	C	0..1	BackboneElement	Participants involved in appointment Constraints: app-1
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
actor	Σ	1..1	Reference(NZ Patient | Patient)	Person, Location/HealthcareService or Device
type	Σ	1..1	uri	Type the reference refers to (e.g. "Patient") Binding: ResourceType (extensible): Aa resource (or, for logical models, the URI of the logical model). Required Pattern: Patient
identifier	Σ	1..1	Identifier	Logical reference, when literal reference is not known
use	?!Σ	0..1	code	usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .
system	Σ	1..1	uri	The namespace for the identifier value Fixed Value: https://standards.digital.health.nz/ns/nhi-id
value	ΣC	1..1	string	Must be an absolute URL reference to the patient on the NHI system. See constraints for details. Constraints: nhi-value-format Example General: 123456
status	Σ	1..1	code	accepted | declined | tentative | needs-action Binding: ParticipationStatus (required): The Participation status of an appointment.
Documentation for this format

Terminology Bindings

Path	Status	Usage	ValueSet	Version	Source
Appointment.meta.tag	Base	example	Common Tags	📍4.0.1	FHIR Std.
Appointment.meta.tag:correlationId	Base	example	Common Tags	📍4.0.1	FHIR Std.
Appointment.identifier.​use	Base	required	IdentifierUse	📍4.0.1	FHIR Std.
Appointment.status	Base	required	AppointmentStatus	📍4.0.1	FHIR Std.
Appointment.reasonCode	Base	required	NZ Appointment Reason Codes Code System	📦0.4.5	This IG
Appointment.supportingInformation.​type	Base	extensible	ResourceType	📍4.0.1	FHIR Std.
Appointment.supportingInformation.​identifier.use	Base	required	IdentifierUse	📍4.0.1	FHIR Std.
Appointment.participant.​status	Base	required	ParticipationStatus	📍4.0.1	FHIR Std.
Appointment.participant:patient.​actor.type	Base	extensible	ResourceType	📍4.0.1	FHIR Std.
Appointment.participant:patient.​actor.identifier.use	Base	required	IdentifierUse	📍4.0.1	FHIR Std.
Appointment.participant:patient.​status	Base	required	ParticipationStatus	📍4.0.1	FHIR Std.

Constraints

Id	Grade	Path(s)	Description	Expression
app-1	error	Appointment.participant, Appointment.participant:patient	Either the type or actor on the participant SHALL be specified	type.exists() or actor.exists()
app-2	error	Appointment	Either start and end are specified, or neither	start.exists() = end.exists()
app-3	error	Appointment	Only proposed or cancelled appointments can be missing start/end dates	(start.exists() and end.exists()) or (status in ('proposed' | 'cancelled' | 'waitlist'))
app-4	error	Appointment	Cancelation reason is only used for appointments that have been cancelled, or no-show	Appointment.cancelationReason.exists() implies (Appointment.status='no-show' or Appointment.status='cancelled')
dom-2	error	Appointment	If the resource is contained in another resource, it SHALL NOT contain nested Resources	contained.contained.empty()
dom-3	error	Appointment	If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource	contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()
dom-4	error	Appointment	If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated	contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()
dom-5	error	Appointment	If a resource is contained in another resource, it SHALL NOT have a security label	contained.meta.security.empty()
dom-6	best practice	Appointment	A resource should have narrative for robust management	text.`div`.exists()
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children	hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both	extension.exists() != value.exists()
full-datetime-with-timezone	error	Appointment.created	DateTime must be ISO 8601 format with time and timezone (e.g., 2026-01-01T00:00:00+13:00 or 2026-01-01T00:00:00Z). Date-only values are not accepted.	toString().matches('^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\\.[0-9]+)?(Z|[+-][0-9]{2}:[0-9]{2})$')
hpi-location-url-format	error	Appointment.meta.source	Reference must be an HPI facility URL with format https://standards.digital.health.nz/ns/hpi-facility-id/FZZ111-A	matches('^https://standards.digital.health.nz/ns/hpi-facility-id/F[A-Za-z0-9]{2}[0-9]{3}-[A-Za-z0-9]$')
hpiOrganizationIdPattern	error	Appointment.supportingInformation.identifier	HPI Organisation ID must conform to format (GXXnnn-C).	system = 'https://standards.digital.health.nz/ns/hpi-organisation-id' implies value.matches('^G[a-zA-Z0-9]{2}[0-9]{3}-[a-zA-Z0-9]$')
nhi-value-format	error	Appointment.participant:patient.actor.identifier.value	Reference must be an NHI Patient URL with format ZZZ1111 or ZZZ11AA	matches('^[A-Z]{3}([0-9]{4}|[0-9]{2}[A-Z]{2})$')
patient-or-data-absent-reason	error	Appointment	Either a patient participant must be present, or a participant with a data-absent-reason extension on actor must be provided, but not both.	participant.where(actor.type = 'Patient').exists() xor participant.where(actor.extension.where(url = 'http://hl7.org/fhir/StructureDefinition/data-absent-reason').exists()).exists()

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Appointment	C	0..*	Appointment	A booking of a healthcare event among patient(s), practitioner(s), related person(s) and/or device(s) for a specific date/time. This may result in one or more Encounter(s) Constraints: patient-or-data-absent-reason
meta		1..1	Meta	Metadata about the resource
source	C	1..1	uri	HPI Facility ID from where the record is sourced Constraints: hpi-location-url-format
Slices for tag		1..*	Coding	Tags applied to this resource Slice: Unordered, Open by value:system
tag:correlationId		1..1	Coding	Tags applied to this resource
system		1..1	uri	Hub correlation ID system Required Pattern: https://hub.services.digital.health.nz/ns/correlation-id
code		1..1	code	Symbol in syntax defined by the system
contained		0..0		Contained, inline Resources
identifier		0..1	Identifier	External Ids for this item
system		1..1	uri	The namespace for the identifier value
value		1..1	string	The value that is unique
serviceCategory		0..0		A broad categorization of the service that is to be performed during this appointment
serviceType		0..0		The specific service that is to be performed during this appointment
specialty		0..0		The specialty of a practitioner that would be required to perform the service requested in this appointment
appointmentType		0..0		The style of appointment or patient that has been booked in the slot (not service type)
reasonCode		1..*	CodeableConcept	Coded reason this appointment is scheduled Binding: NZ Appointment Reason Codes Code System (required)
reasonReference		0..0		Reason the appointment is to take place (resource)
priority		0..0		Used to make informed decisions if needing to re-prioritize
supportingInformation		1..1	Reference(Organization)	The provider organisation that owns this appointment
type		1..1	uri	Type the reference refers to (e.g. "Patient") Required Pattern: Organization
identifier	C	1..1	Identifier	Logical reference, when literal reference is not known Constraints: hpiOrganizationIdPattern
use		0..1	code	usual | official | temp | secondary | old (If known) Required Pattern: official
system		1..1	uri	The namespace for the identifier value Required Pattern: https://standards.digital.health.nz/ns/hpi-organisation-id
value		1..1	string	The value that is unique
minutesDuration		0..0		Can be less than start/end (e.g. estimate)
created	C	0..1	dateTime	The date that this appointment was initially created Constraints: full-datetime-with-timezone
patientInstruction		0..0		Detailed information and instructions for the patient
basedOn		0..0		The service request this appointment is allocated to assess
Slices for participant		1..*	BackboneElement	Participants involved in appointment Slice: Unordered, Open by pattern:actor.type
participant:patient		0..1	BackboneElement	Participants involved in appointment
actor		1..1	Reference(NZ Patient | Patient)	Person, Location/HealthcareService or Device
type		1..1	uri	Type the reference refers to (e.g. "Patient") Required Pattern: Patient
identifier		1..1	Identifier	Logical reference, when literal reference is not known
system		1..1	uri	The namespace for the identifier value Fixed Value: https://standards.digital.health.nz/ns/nhi-id
value	C	1..1	string	Must be an absolute URL reference to the patient on the NHI system. See constraints for details. Constraints: nhi-value-format
display		0..0		Remove from all examples. Never return in a response. Never save if provided.
Documentation for this format

Terminology Bindings (Differential)

Path	Status	Usage	ValueSet	Version	Source
Appointment.reasonCode	Base	required	NZ Appointment Reason Codes Code System	📦0.4.5	This IG

Constraints

Id	Grade	Path(s)	Description	Expression
full-datetime-with-timezone	error	Appointment.created	DateTime must be ISO 8601 format with time and timezone (e.g., 2026-01-01T00:00:00+13:00 or 2026-01-01T00:00:00Z). Date-only values are not accepted.	toString().matches('^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\\.[0-9]+)?(Z|[+-][0-9]{2}:[0-9]{2})$')
hpi-location-url-format	error	Appointment.meta.source	Reference must be an HPI facility URL with format https://standards.digital.health.nz/ns/hpi-facility-id/FZZ111-A	matches('^https://standards.digital.health.nz/ns/hpi-facility-id/F[A-Za-z0-9]{2}[0-9]{3}-[A-Za-z0-9]$')
hpiOrganizationIdPattern	error	Appointment.supportingInformation.identifier	HPI Organisation ID must conform to format (GXXnnn-C).	system = 'https://standards.digital.health.nz/ns/hpi-organisation-id' implies value.matches('^G[a-zA-Z0-9]{2}[0-9]{3}-[a-zA-Z0-9]$')
nhi-value-format	error	Appointment.participant:patient.actor.identifier.value	Reference must be an NHI Patient URL with format ZZZ1111 or ZZZ11AA	matches('^[A-Z]{3}([0-9]{4}|[0-9]{2}[A-Z]{2})$')
patient-or-data-absent-reason	error	Appointment	Either a patient participant must be present, or a participant with a data-absent-reason extension on actor must be provided, but not both.	participant.where(actor.type = 'Patient').exists() xor participant.where(actor.extension.where(url = 'http://hl7.org/fhir/StructureDefinition/data-absent-reason').exists()).exists()

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Appointment	C	0..*	Appointment	A booking of a healthcare event among patient(s), practitioner(s), related person(s) and/or device(s) for a specific date/time. This may result in one or more Encounter(s) Constraints: app-2, app-3, app-4, patient-or-data-absent-reason
id	Σ	0..1	id	Logical id of this artifact
meta	Σ	1..1	Meta	Metadata about the resource
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
versionId	Σ	0..1	id	Version specific identifier
lastUpdated	Σ	0..1	instant	When the resource version last changed
source	ΣC	1..1	uri	HPI Facility ID from where the record is sourced Constraints: hpi-location-url-format
profile	Σ	0..*	canonical(StructureDefinition)	Profiles this resource claims to conform to
security	Σ	0..*	Coding	Security Labels applied to this resource Binding: All Security Labels (extensible): Security Labels from the Healthcare Privacy and Security Classification System.
Slices for tag	Σ	1..*	Coding	Tags applied to this resource Slice: Unordered, Open by value:system Binding: CommonTags (example): Codes that represent various types of tags, commonly workflow-related; e.g. "Needs review by Dr. Jones".
tag:correlationId	Σ	1..1	Coding	Tags applied to this resource Binding: CommonTags (example): Codes that represent various types of tags, commonly workflow-related; e.g. "Needs review by Dr. Jones".
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
system	Σ	1..1	uri	Hub correlation ID system Required Pattern: https://hub.services.digital.health.nz/ns/correlation-id
version	Σ	0..1	string	Version of the system - if relevant
code	Σ	1..1	code	Symbol in syntax defined by the system
display	Σ	0..1	string	Representation defined by the system
userSelected	Σ	0..1	boolean	If this coding was chosen directly by the user
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
language		0..1	code	Language of the resource content Binding: CommonLanguages (preferred): A human language. Additional Bindings Purpose AllLanguages Max Binding
text		0..1	Narrative	Text summary of the resource, for human interpretation This profile does not constrain the narrative in regard to content, language, or traceability to data elements
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!	0..*	Extension	Extensions that cannot be ignored
identifier	Σ	0..1	Identifier	External Ids for this item
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
use	?!Σ	0..1	code	usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .
type	Σ	0..1	CodeableConcept	Description of identifier Binding: Identifier Type Codes (extensible): A coded type for an identifier that can be used to determine which identifier to use for a specific purpose.
system	Σ	1..1	uri	The namespace for the identifier value Example General: http://www.acme.com/identifiers/patient
value	Σ	1..1	string	The value that is unique Example General: 123456
period	Σ	0..1	Period	Time period when id is/was valid for use
assigner	Σ	0..1	Reference(Organization)	Organization that issued id (may be just text)
status	?!Σ	1..1	code	proposed | pending | booked | arrived | fulfilled | cancelled | noshow | entered-in-error | checked-in | waitlist Binding: AppointmentStatus (required): The free/busy status of an appointment.
cancelationReason	Σ	0..1	CodeableConcept	The coded reason for the appointment being cancelled Binding: AppointmentCancellationReason (example)
reasonCode	Σ	1..*	CodeableConcept	Coded reason this appointment is scheduled Binding: NZ Appointment Reason Codes Code System (required)
description		0..1	string	Shown on a subject line in a meeting request, or appointment list
supportingInformation		1..1	Reference(Organization)	The provider organisation that owns this appointment
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
reference	ΣC	0..1	string	Literal reference, Relative, internal or absolute URL
type	Σ	1..1	uri	Type the reference refers to (e.g. "Patient") Binding: ResourceType (extensible): Aa resource (or, for logical models, the URI of the logical model). Required Pattern: Organization
identifier	ΣC	1..1	Identifier	Logical reference, when literal reference is not known Constraints: hpiOrganizationIdPattern
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
use	?!Σ	0..1	code	usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known . Required Pattern: official
type	Σ	0..1	CodeableConcept	Description of identifier Binding: Identifier Type Codes (extensible): A coded type for an identifier that can be used to determine which identifier to use for a specific purpose.
system	Σ	1..1	uri	The namespace for the identifier value Required Pattern: https://standards.digital.health.nz/ns/hpi-organisation-id
value	Σ	1..1	string	The value that is unique Example General: 123456
period	Σ	0..1	Period	Time period when id is/was valid for use
assigner	Σ	0..1	Reference(Organization)	Organization that issued id (may be just text)
display	Σ	0..1	string	Text alternative for the resource
start	Σ	0..1	instant	When appointment is to take place
end	Σ	0..1	instant	When appointment is to conclude
slot		0..*	Reference(Slot)	The slots that this appointment is filling
created	C	0..1	dateTime	The date that this appointment was initially created Constraints: full-datetime-with-timezone
comment		0..1	string	Additional comments
Slices for participant	C	1..*	BackboneElement	Participants involved in appointment Slice: Unordered, Open by pattern:actor.type Constraints: app-1
participant:All Slices				Content/Rules for all slices
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
type	Σ	0..*	CodeableConcept	Role of participant in the appointment Binding: ParticipantType (extensible): Role of participant in encounter.
actor	Σ	0..1	Reference(Patient | Practitioner | PractitionerRole | RelatedPerson | Device | HealthcareService | Location)	Person, Location/HealthcareService or Device
required	Σ	0..1	code	required | optional | information-only Binding: ParticipantRequired (required): Is the Participant required to attend the appointment.
status	Σ	1..1	code	accepted | declined | tentative | needs-action Binding: ParticipationStatus (required): The Participation status of an appointment.
period		0..1	Period	Participation period of the actor
participant:patient	C	0..1	BackboneElement	Participants involved in appointment Constraints: app-1
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
type	Σ	0..*	CodeableConcept	Role of participant in the appointment Binding: ParticipantType (extensible): Role of participant in encounter.
actor	Σ	1..1	Reference(NZ Patient | Patient)	Person, Location/HealthcareService or Device
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
reference	ΣC	0..1	string	Literal reference, Relative, internal or absolute URL
type	Σ	1..1	uri	Type the reference refers to (e.g. "Patient") Binding: ResourceType (extensible): Aa resource (or, for logical models, the URI of the logical model). Required Pattern: Patient
identifier	Σ	1..1	Identifier	Logical reference, when literal reference is not known
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
use	?!Σ	0..1	code	usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .
type	Σ	0..1	CodeableConcept	Description of identifier Binding: Identifier Type Codes (extensible): A coded type for an identifier that can be used to determine which identifier to use for a specific purpose.
system	Σ	1..1	uri	The namespace for the identifier value Fixed Value: https://standards.digital.health.nz/ns/nhi-id
value	ΣC	1..1	string	Must be an absolute URL reference to the patient on the NHI system. See constraints for details. Constraints: nhi-value-format Example General: 123456
period	Σ	0..1	Period	Time period when id is/was valid for use
assigner	Σ	0..1	Reference(Organization)	Organization that issued id (may be just text)
required	Σ	0..1	code	required | optional | information-only Binding: ParticipantRequired (required): Is the Participant required to attend the appointment.
status	Σ	1..1	code	accepted | declined | tentative | needs-action Binding: ParticipationStatus (required): The Participation status of an appointment.
period		0..1	Period	Participation period of the actor
requestedPeriod		0..*	Period	Potential date/time interval(s) requested to allocate the appointment within
Documentation for this format

Terminology Bindings

Path	Status	Usage	ValueSet	Version	Source
Appointment.meta.security	Base	extensible	SecurityLabels	📍4.0.1	FHIR Std.
Appointment.meta.tag	Base	example	Common Tags	📍4.0.1	FHIR Std.
Appointment.meta.tag:correlationId	Base	example	Common Tags	📍4.0.1	FHIR Std.
Appointment.language	Base	preferred	Common Languages	📍4.0.1	FHIR Std.
Appointment.identifier.​use	Base	required	IdentifierUse	📍4.0.1	FHIR Std.
Appointment.identifier.​type	Base	extensible	IdentifierType	📍4.0.1	FHIR Std.
Appointment.status	Base	required	AppointmentStatus	📍4.0.1	FHIR Std.
Appointment.cancelationReason	Base	example	Appointment cancellation reason	📍4.0.1	FHIR Std.
Appointment.reasonCode	Base	required	NZ Appointment Reason Codes Code System	📦0.4.5	This IG
Appointment.supportingInformation.​type	Base	extensible	ResourceType	📍4.0.1	FHIR Std.
Appointment.supportingInformation.​identifier.use	Base	required	IdentifierUse	📍4.0.1	FHIR Std.
Appointment.supportingInformation.​identifier.type	Base	extensible	IdentifierType	📍4.0.1	FHIR Std.
Appointment.participant.​type	Base	extensible	Participant type	📍4.0.1	FHIR Std.
Appointment.participant.​required	Base	required	ParticipantRequired	📍4.0.1	FHIR Std.
Appointment.participant.​status	Base	required	ParticipationStatus	📍4.0.1	FHIR Std.
Appointment.participant:patient.​type	Base	extensible	Participant type	📍4.0.1	FHIR Std.
Appointment.participant:patient.​actor.type	Base	extensible	ResourceType	📍4.0.1	FHIR Std.
Appointment.participant:patient.​actor.identifier.use	Base	required	IdentifierUse	📍4.0.1	FHIR Std.
Appointment.participant:patient.​actor.identifier.type	Base	extensible	IdentifierType	📍4.0.1	FHIR Std.
Appointment.participant:patient.​required	Base	required	ParticipantRequired	📍4.0.1	FHIR Std.
Appointment.participant:patient.​status	Base	required	ParticipationStatus	📍4.0.1	FHIR Std.

Constraints

Id	Grade	Path(s)	Description	Expression
app-1	error	Appointment.participant, Appointment.participant:patient	Either the type or actor on the participant SHALL be specified	type.exists() or actor.exists()
app-2	error	Appointment	Either start and end are specified, or neither	start.exists() = end.exists()
app-3	error	Appointment	Only proposed or cancelled appointments can be missing start/end dates	(start.exists() and end.exists()) or (status in ('proposed' | 'cancelled' | 'waitlist'))
app-4	error	Appointment	Cancelation reason is only used for appointments that have been cancelled, or no-show	Appointment.cancelationReason.exists() implies (Appointment.status='no-show' or Appointment.status='cancelled')
dom-2	error	Appointment	If the resource is contained in another resource, it SHALL NOT contain nested Resources	contained.contained.empty()
dom-3	error	Appointment	If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource	contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()
dom-4	error	Appointment	If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated	contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()
dom-5	error	Appointment	If a resource is contained in another resource, it SHALL NOT have a security label	contained.meta.security.empty()
dom-6	best practice	Appointment	A resource should have narrative for robust management	text.`div`.exists()
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children	hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both	extension.exists() != value.exists()
full-datetime-with-timezone	error	Appointment.created	DateTime must be ISO 8601 format with time and timezone (e.g., 2026-01-01T00:00:00+13:00 or 2026-01-01T00:00:00Z). Date-only values are not accepted.	toString().matches('^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\\.[0-9]+)?(Z|[+-][0-9]{2}:[0-9]{2})$')
hpi-location-url-format	error	Appointment.meta.source	Reference must be an HPI facility URL with format https://standards.digital.health.nz/ns/hpi-facility-id/FZZ111-A	matches('^https://standards.digital.health.nz/ns/hpi-facility-id/F[A-Za-z0-9]{2}[0-9]{3}-[A-Za-z0-9]$')
hpiOrganizationIdPattern	error	Appointment.supportingInformation.identifier	HPI Organisation ID must conform to format (GXXnnn-C).	system = 'https://standards.digital.health.nz/ns/hpi-organisation-id' implies value.matches('^G[a-zA-Z0-9]{2}[0-9]{3}-[a-zA-Z0-9]$')
nhi-value-format	error	Appointment.participant:patient.actor.identifier.value	Reference must be an NHI Patient URL with format ZZZ1111 or ZZZ11AA	matches('^[A-Z]{3}([0-9]{4}|[0-9]{2}[A-Z]{2})$')
patient-or-data-absent-reason	error	Appointment	Either a patient participant must be present, or a participant with a data-absent-reason extension on actor must be provided, but not both.	participant.where(actor.type = 'Patient').exists() xor participant.where(actor.extension.where(url = 'http://hl7.org/fhir/StructureDefinition/data-absent-reason').exists()).exists()

Summary

Mandatory: 12 elements(7 nested mandatory elements)
Fixed: 1 element
Prohibited: 11 elements

Structures

This structure refers to these other structures:

• NZ Patient (http://hl7.org.nz/fhir/StructureDefinition/NzPatient)

Slices

This structure defines the following Slices:

• The element 1 is sliced based on the value of Appointment.meta.tag
• The element 1 is sliced based on the value of Appointment.participant

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Appointment	C	0..*	Appointment	A booking of a healthcare event among patient(s), practitioner(s), related person(s) and/or device(s) for a specific date/time. This may result in one or more Encounter(s) Constraints: app-2, app-3, app-4, patient-or-data-absent-reason
meta	Σ	1..1	Meta	Metadata about the resource
source	ΣC	1..1	uri	HPI Facility ID from where the record is sourced Constraints: hpi-location-url-format
Slices for tag	Σ	1..*	Coding	Tags applied to this resource Slice: Unordered, Open by value:system Binding: CommonTags (example): Codes that represent various types of tags, commonly workflow-related; e.g. "Needs review by Dr. Jones".
tag:correlationId	Σ	1..1	Coding	Tags applied to this resource Binding: CommonTags (example): Codes that represent various types of tags, commonly workflow-related; e.g. "Needs review by Dr. Jones".
system	Σ	1..1	uri	Hub correlation ID system Required Pattern: https://hub.services.digital.health.nz/ns/correlation-id
code	Σ	1..1	code	Symbol in syntax defined by the system
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
modifierExtension	?!	0..*	Extension	Extensions that cannot be ignored
identifier	Σ	0..1	Identifier	External Ids for this item
use	?!Σ	0..1	code	usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .
system	Σ	1..1	uri	The namespace for the identifier value Example General: http://www.acme.com/identifiers/patient
value	Σ	1..1	string	The value that is unique Example General: 123456
status	?!Σ	1..1	code	proposed | pending | booked | arrived | fulfilled | cancelled | noshow | entered-in-error | checked-in | waitlist Binding: AppointmentStatus (required): The free/busy status of an appointment.
reasonCode	Σ	1..*	CodeableConcept	Coded reason this appointment is scheduled Binding: NZ Appointment Reason Codes Code System (required)
supportingInformation		1..1	Reference(Organization)	The provider organisation that owns this appointment
type	Σ	1..1	uri	Type the reference refers to (e.g. "Patient") Binding: ResourceType (extensible): Aa resource (or, for logical models, the URI of the logical model). Required Pattern: Organization
identifier	ΣC	1..1	Identifier	Logical reference, when literal reference is not known Constraints: hpiOrganizationIdPattern
use	?!Σ	0..1	code	usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known . Required Pattern: official
system	Σ	1..1	uri	The namespace for the identifier value Required Pattern: https://standards.digital.health.nz/ns/hpi-organisation-id
value	Σ	1..1	string	The value that is unique Example General: 123456
created	C	0..1	dateTime	The date that this appointment was initially created Constraints: full-datetime-with-timezone
Slices for participant	C	1..*	BackboneElement	Participants involved in appointment Slice: Unordered, Open by pattern:actor.type Constraints: app-1
participant:All Slices				Content/Rules for all slices
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
status	Σ	1..1	code	accepted | declined | tentative | needs-action Binding: ParticipationStatus (required): The Participation status of an appointment.
participant:patient	C	0..1	BackboneElement	Participants involved in appointment Constraints: app-1
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
actor	Σ	1..1	Reference(NZ Patient | Patient)	Person, Location/HealthcareService or Device
type	Σ	1..1	uri	Type the reference refers to (e.g. "Patient") Binding: ResourceType (extensible): Aa resource (or, for logical models, the URI of the logical model). Required Pattern: Patient
identifier	Σ	1..1	Identifier	Logical reference, when literal reference is not known
use	?!Σ	0..1	code	usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .
system	Σ	1..1	uri	The namespace for the identifier value Fixed Value: https://standards.digital.health.nz/ns/nhi-id
value	ΣC	1..1	string	Must be an absolute URL reference to the patient on the NHI system. See constraints for details. Constraints: nhi-value-format Example General: 123456
status	Σ	1..1	code	accepted | declined | tentative | needs-action Binding: ParticipationStatus (required): The Participation status of an appointment.
Documentation for this format

Terminology Bindings

Path	Status	Usage	ValueSet	Version	Source
Appointment.meta.tag	Base	example	Common Tags	📍4.0.1	FHIR Std.
Appointment.meta.tag:correlationId	Base	example	Common Tags	📍4.0.1	FHIR Std.
Appointment.identifier.​use	Base	required	IdentifierUse	📍4.0.1	FHIR Std.
Appointment.status	Base	required	AppointmentStatus	📍4.0.1	FHIR Std.
Appointment.reasonCode	Base	required	NZ Appointment Reason Codes Code System	📦0.4.5	This IG
Appointment.supportingInformation.​type	Base	extensible	ResourceType	📍4.0.1	FHIR Std.
Appointment.supportingInformation.​identifier.use	Base	required	IdentifierUse	📍4.0.1	FHIR Std.
Appointment.participant.​status	Base	required	ParticipationStatus	📍4.0.1	FHIR Std.
Appointment.participant:patient.​actor.type	Base	extensible	ResourceType	📍4.0.1	FHIR Std.
Appointment.participant:patient.​actor.identifier.use	Base	required	IdentifierUse	📍4.0.1	FHIR Std.
Appointment.participant:patient.​status	Base	required	ParticipationStatus	📍4.0.1	FHIR Std.

Constraints

Id	Grade	Path(s)	Description	Expression
app-1	error	Appointment.participant, Appointment.participant:patient	Either the type or actor on the participant SHALL be specified	type.exists() or actor.exists()
app-2	error	Appointment	Either start and end are specified, or neither	start.exists() = end.exists()
app-3	error	Appointment	Only proposed or cancelled appointments can be missing start/end dates	(start.exists() and end.exists()) or (status in ('proposed' | 'cancelled' | 'waitlist'))
app-4	error	Appointment	Cancelation reason is only used for appointments that have been cancelled, or no-show	Appointment.cancelationReason.exists() implies (Appointment.status='no-show' or Appointment.status='cancelled')
dom-2	error	Appointment	If the resource is contained in another resource, it SHALL NOT contain nested Resources	contained.contained.empty()
dom-3	error	Appointment	If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource	contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()
dom-4	error	Appointment	If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated	contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()
dom-5	error	Appointment	If a resource is contained in another resource, it SHALL NOT have a security label	contained.meta.security.empty()
dom-6	best practice	Appointment	A resource should have narrative for robust management	text.`div`.exists()
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children	hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both	extension.exists() != value.exists()
full-datetime-with-timezone	error	Appointment.created	DateTime must be ISO 8601 format with time and timezone (e.g., 2026-01-01T00:00:00+13:00 or 2026-01-01T00:00:00Z). Date-only values are not accepted.	toString().matches('^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\\.[0-9]+)?(Z|[+-][0-9]{2}:[0-9]{2})$')
hpi-location-url-format	error	Appointment.meta.source	Reference must be an HPI facility URL with format https://standards.digital.health.nz/ns/hpi-facility-id/FZZ111-A	matches('^https://standards.digital.health.nz/ns/hpi-facility-id/F[A-Za-z0-9]{2}[0-9]{3}-[A-Za-z0-9]$')
hpiOrganizationIdPattern	error	Appointment.supportingInformation.identifier	HPI Organisation ID must conform to format (GXXnnn-C).	system = 'https://standards.digital.health.nz/ns/hpi-organisation-id' implies value.matches('^G[a-zA-Z0-9]{2}[0-9]{3}-[a-zA-Z0-9]$')
nhi-value-format	error	Appointment.participant:patient.actor.identifier.value	Reference must be an NHI Patient URL with format ZZZ1111 or ZZZ11AA	matches('^[A-Z]{3}([0-9]{4}|[0-9]{2}[A-Z]{2})$')
patient-or-data-absent-reason	error	Appointment	Either a patient participant must be present, or a participant with a data-absent-reason extension on actor must be provided, but not both.	participant.where(actor.type = 'Patient').exists() xor participant.where(actor.extension.where(url = 'http://hl7.org/fhir/StructureDefinition/data-absent-reason').exists()).exists()

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Appointment	C	0..*	Appointment	A booking of a healthcare event among patient(s), practitioner(s), related person(s) and/or device(s) for a specific date/time. This may result in one or more Encounter(s) Constraints: patient-or-data-absent-reason
meta		1..1	Meta	Metadata about the resource
source	C	1..1	uri	HPI Facility ID from where the record is sourced Constraints: hpi-location-url-format
Slices for tag		1..*	Coding	Tags applied to this resource Slice: Unordered, Open by value:system
tag:correlationId		1..1	Coding	Tags applied to this resource
system		1..1	uri	Hub correlation ID system Required Pattern: https://hub.services.digital.health.nz/ns/correlation-id
code		1..1	code	Symbol in syntax defined by the system
contained		0..0		Contained, inline Resources
identifier		0..1	Identifier	External Ids for this item
system		1..1	uri	The namespace for the identifier value
value		1..1	string	The value that is unique
serviceCategory		0..0		A broad categorization of the service that is to be performed during this appointment
serviceType		0..0		The specific service that is to be performed during this appointment
specialty		0..0		The specialty of a practitioner that would be required to perform the service requested in this appointment
appointmentType		0..0		The style of appointment or patient that has been booked in the slot (not service type)
reasonCode		1..*	CodeableConcept	Coded reason this appointment is scheduled Binding: NZ Appointment Reason Codes Code System (required)
reasonReference		0..0		Reason the appointment is to take place (resource)
priority		0..0		Used to make informed decisions if needing to re-prioritize
supportingInformation		1..1	Reference(Organization)	The provider organisation that owns this appointment
type		1..1	uri	Type the reference refers to (e.g. "Patient") Required Pattern: Organization
identifier	C	1..1	Identifier	Logical reference, when literal reference is not known Constraints: hpiOrganizationIdPattern
use		0..1	code	usual | official | temp | secondary | old (If known) Required Pattern: official
system		1..1	uri	The namespace for the identifier value Required Pattern: https://standards.digital.health.nz/ns/hpi-organisation-id
value		1..1	string	The value that is unique
minutesDuration		0..0		Can be less than start/end (e.g. estimate)
created	C	0..1	dateTime	The date that this appointment was initially created Constraints: full-datetime-with-timezone
patientInstruction		0..0		Detailed information and instructions for the patient
basedOn		0..0		The service request this appointment is allocated to assess
Slices for participant		1..*	BackboneElement	Participants involved in appointment Slice: Unordered, Open by pattern:actor.type
participant:patient		0..1	BackboneElement	Participants involved in appointment
actor		1..1	Reference(NZ Patient | Patient)	Person, Location/HealthcareService or Device
type		1..1	uri	Type the reference refers to (e.g. "Patient") Required Pattern: Patient
identifier		1..1	Identifier	Logical reference, when literal reference is not known
system		1..1	uri	The namespace for the identifier value Fixed Value: https://standards.digital.health.nz/ns/nhi-id
value	C	1..1	string	Must be an absolute URL reference to the patient on the NHI system. See constraints for details. Constraints: nhi-value-format
display		0..0		Remove from all examples. Never return in a response. Never save if provided.
Documentation for this format

Terminology Bindings (Differential)

Path	Status	Usage	ValueSet	Version	Source
Appointment.reasonCode	Base	required	NZ Appointment Reason Codes Code System	📦0.4.5	This IG

Constraints

Id	Grade	Path(s)	Description	Expression
full-datetime-with-timezone	error	Appointment.created	DateTime must be ISO 8601 format with time and timezone (e.g., 2026-01-01T00:00:00+13:00 or 2026-01-01T00:00:00Z). Date-only values are not accepted.	toString().matches('^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\\.[0-9]+)?(Z|[+-][0-9]{2}:[0-9]{2})$')
hpi-location-url-format	error	Appointment.meta.source	Reference must be an HPI facility URL with format https://standards.digital.health.nz/ns/hpi-facility-id/FZZ111-A	matches('^https://standards.digital.health.nz/ns/hpi-facility-id/F[A-Za-z0-9]{2}[0-9]{3}-[A-Za-z0-9]$')
hpiOrganizationIdPattern	error	Appointment.supportingInformation.identifier	HPI Organisation ID must conform to format (GXXnnn-C).	system = 'https://standards.digital.health.nz/ns/hpi-organisation-id' implies value.matches('^G[a-zA-Z0-9]{2}[0-9]{3}-[a-zA-Z0-9]$')
nhi-value-format	error	Appointment.participant:patient.actor.identifier.value	Reference must be an NHI Patient URL with format ZZZ1111 or ZZZ11AA	matches('^[A-Z]{3}([0-9]{4}|[0-9]{2}[A-Z]{2})$')
patient-or-data-absent-reason	error	Appointment	Either a patient participant must be present, or a participant with a data-absent-reason extension on actor must be provided, but not both.	participant.where(actor.type = 'Patient').exists() xor participant.where(actor.extension.where(url = 'http://hl7.org/fhir/StructureDefinition/data-absent-reason').exists()).exists()

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Appointment	C	0..*	Appointment	A booking of a healthcare event among patient(s), practitioner(s), related person(s) and/or device(s) for a specific date/time. This may result in one or more Encounter(s) Constraints: app-2, app-3, app-4, patient-or-data-absent-reason
id	Σ	0..1	id	Logical id of this artifact
meta	Σ	1..1	Meta	Metadata about the resource
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
versionId	Σ	0..1	id	Version specific identifier
lastUpdated	Σ	0..1	instant	When the resource version last changed
source	ΣC	1..1	uri	HPI Facility ID from where the record is sourced Constraints: hpi-location-url-format
profile	Σ	0..*	canonical(StructureDefinition)	Profiles this resource claims to conform to
security	Σ	0..*	Coding	Security Labels applied to this resource Binding: All Security Labels (extensible): Security Labels from the Healthcare Privacy and Security Classification System.
Slices for tag	Σ	1..*	Coding	Tags applied to this resource Slice: Unordered, Open by value:system Binding: CommonTags (example): Codes that represent various types of tags, commonly workflow-related; e.g. "Needs review by Dr. Jones".
tag:correlationId	Σ	1..1	Coding	Tags applied to this resource Binding: CommonTags (example): Codes that represent various types of tags, commonly workflow-related; e.g. "Needs review by Dr. Jones".
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
system	Σ	1..1	uri	Hub correlation ID system Required Pattern: https://hub.services.digital.health.nz/ns/correlation-id
version	Σ	0..1	string	Version of the system - if relevant
code	Σ	1..1	code	Symbol in syntax defined by the system
display	Σ	0..1	string	Representation defined by the system
userSelected	Σ	0..1	boolean	If this coding was chosen directly by the user
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
language		0..1	code	Language of the resource content Binding: CommonLanguages (preferred): A human language. Additional Bindings Purpose AllLanguages Max Binding
text		0..1	Narrative	Text summary of the resource, for human interpretation This profile does not constrain the narrative in regard to content, language, or traceability to data elements
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!	0..*	Extension	Extensions that cannot be ignored
identifier	Σ	0..1	Identifier	External Ids for this item
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
use	?!Σ	0..1	code	usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .
type	Σ	0..1	CodeableConcept	Description of identifier Binding: Identifier Type Codes (extensible): A coded type for an identifier that can be used to determine which identifier to use for a specific purpose.
system	Σ	1..1	uri	The namespace for the identifier value Example General: http://www.acme.com/identifiers/patient
value	Σ	1..1	string	The value that is unique Example General: 123456
period	Σ	0..1	Period	Time period when id is/was valid for use
assigner	Σ	0..1	Reference(Organization)	Organization that issued id (may be just text)
status	?!Σ	1..1	code	proposed | pending | booked | arrived | fulfilled | cancelled | noshow | entered-in-error | checked-in | waitlist Binding: AppointmentStatus (required): The free/busy status of an appointment.
cancelationReason	Σ	0..1	CodeableConcept	The coded reason for the appointment being cancelled Binding: AppointmentCancellationReason (example)
reasonCode	Σ	1..*	CodeableConcept	Coded reason this appointment is scheduled Binding: NZ Appointment Reason Codes Code System (required)
description		0..1	string	Shown on a subject line in a meeting request, or appointment list
supportingInformation		1..1	Reference(Organization)	The provider organisation that owns this appointment
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
reference	ΣC	0..1	string	Literal reference, Relative, internal or absolute URL
type	Σ	1..1	uri	Type the reference refers to (e.g. "Patient") Binding: ResourceType (extensible): Aa resource (or, for logical models, the URI of the logical model). Required Pattern: Organization
identifier	ΣC	1..1	Identifier	Logical reference, when literal reference is not known Constraints: hpiOrganizationIdPattern
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
use	?!Σ	0..1	code	usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known . Required Pattern: official
type	Σ	0..1	CodeableConcept	Description of identifier Binding: Identifier Type Codes (extensible): A coded type for an identifier that can be used to determine which identifier to use for a specific purpose.
system	Σ	1..1	uri	The namespace for the identifier value Required Pattern: https://standards.digital.health.nz/ns/hpi-organisation-id
value	Σ	1..1	string	The value that is unique Example General: 123456
period	Σ	0..1	Period	Time period when id is/was valid for use
assigner	Σ	0..1	Reference(Organization)	Organization that issued id (may be just text)
display	Σ	0..1	string	Text alternative for the resource
start	Σ	0..1	instant	When appointment is to take place
end	Σ	0..1	instant	When appointment is to conclude
slot		0..*	Reference(Slot)	The slots that this appointment is filling
created	C	0..1	dateTime	The date that this appointment was initially created Constraints: full-datetime-with-timezone
comment		0..1	string	Additional comments
Slices for participant	C	1..*	BackboneElement	Participants involved in appointment Slice: Unordered, Open by pattern:actor.type Constraints: app-1
participant:All Slices				Content/Rules for all slices
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
type	Σ	0..*	CodeableConcept	Role of participant in the appointment Binding: ParticipantType (extensible): Role of participant in encounter.
actor	Σ	0..1	Reference(Patient | Practitioner | PractitionerRole | RelatedPerson | Device | HealthcareService | Location)	Person, Location/HealthcareService or Device
required	Σ	0..1	code	required | optional | information-only Binding: ParticipantRequired (required): Is the Participant required to attend the appointment.
status	Σ	1..1	code	accepted | declined | tentative | needs-action Binding: ParticipationStatus (required): The Participation status of an appointment.
period		0..1	Period	Participation period of the actor
participant:patient	C	0..1	BackboneElement	Participants involved in appointment Constraints: app-1
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
type	Σ	0..*	CodeableConcept	Role of participant in the appointment Binding: ParticipantType (extensible): Role of participant in encounter.
actor	Σ	1..1	Reference(NZ Patient | Patient)	Person, Location/HealthcareService or Device
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
reference	ΣC	0..1	string	Literal reference, Relative, internal or absolute URL
type	Σ	1..1	uri	Type the reference refers to (e.g. "Patient") Binding: ResourceType (extensible): Aa resource (or, for logical models, the URI of the logical model). Required Pattern: Patient
identifier	Σ	1..1	Identifier	Logical reference, when literal reference is not known
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
use	?!Σ	0..1	code	usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .
type	Σ	0..1	CodeableConcept	Description of identifier Binding: Identifier Type Codes (extensible): A coded type for an identifier that can be used to determine which identifier to use for a specific purpose.
system	Σ	1..1	uri	The namespace for the identifier value Fixed Value: https://standards.digital.health.nz/ns/nhi-id
value	ΣC	1..1	string	Must be an absolute URL reference to the patient on the NHI system. See constraints for details. Constraints: nhi-value-format Example General: 123456
period	Σ	0..1	Period	Time period when id is/was valid for use
assigner	Σ	0..1	Reference(Organization)	Organization that issued id (may be just text)
required	Σ	0..1	code	required | optional | information-only Binding: ParticipantRequired (required): Is the Participant required to attend the appointment.
status	Σ	1..1	code	accepted | declined | tentative | needs-action Binding: ParticipationStatus (required): The Participation status of an appointment.
period		0..1	Period	Participation period of the actor
requestedPeriod		0..*	Period	Potential date/time interval(s) requested to allocate the appointment within
Documentation for this format

Terminology Bindings

Path	Status	Usage	ValueSet	Version	Source
Appointment.meta.security	Base	extensible	SecurityLabels	📍4.0.1	FHIR Std.
Appointment.meta.tag	Base	example	Common Tags	📍4.0.1	FHIR Std.
Appointment.meta.tag:correlationId	Base	example	Common Tags	📍4.0.1	FHIR Std.
Appointment.language	Base	preferred	Common Languages	📍4.0.1	FHIR Std.
Appointment.identifier.​use	Base	required	IdentifierUse	📍4.0.1	FHIR Std.
Appointment.identifier.​type	Base	extensible	IdentifierType	📍4.0.1	FHIR Std.
Appointment.status	Base	required	AppointmentStatus	📍4.0.1	FHIR Std.
Appointment.cancelationReason	Base	example	Appointment cancellation reason	📍4.0.1	FHIR Std.
Appointment.reasonCode	Base	required	NZ Appointment Reason Codes Code System	📦0.4.5	This IG
Appointment.supportingInformation.​type	Base	extensible	ResourceType	📍4.0.1	FHIR Std.
Appointment.supportingInformation.​identifier.use	Base	required	IdentifierUse	📍4.0.1	FHIR Std.
Appointment.supportingInformation.​identifier.type	Base	extensible	IdentifierType	📍4.0.1	FHIR Std.
Appointment.participant.​type	Base	extensible	Participant type	📍4.0.1	FHIR Std.
Appointment.participant.​required	Base	required	ParticipantRequired	📍4.0.1	FHIR Std.
Appointment.participant.​status	Base	required	ParticipationStatus	📍4.0.1	FHIR Std.
Appointment.participant:patient.​type	Base	extensible	Participant type	📍4.0.1	FHIR Std.
Appointment.participant:patient.​actor.type	Base	extensible	ResourceType	📍4.0.1	FHIR Std.
Appointment.participant:patient.​actor.identifier.use	Base	required	IdentifierUse	📍4.0.1	FHIR Std.
Appointment.participant:patient.​actor.identifier.type	Base	extensible	IdentifierType	📍4.0.1	FHIR Std.
Appointment.participant:patient.​required	Base	required	ParticipantRequired	📍4.0.1	FHIR Std.
Appointment.participant:patient.​status	Base	required	ParticipationStatus	📍4.0.1	FHIR Std.

Constraints

Id	Grade	Path(s)	Description	Expression
app-1	error	Appointment.participant, Appointment.participant:patient	Either the type or actor on the participant SHALL be specified	type.exists() or actor.exists()
app-2	error	Appointment	Either start and end are specified, or neither	start.exists() = end.exists()
app-3	error	Appointment	Only proposed or cancelled appointments can be missing start/end dates	(start.exists() and end.exists()) or (status in ('proposed' | 'cancelled' | 'waitlist'))
app-4	error	Appointment	Cancelation reason is only used for appointments that have been cancelled, or no-show	Appointment.cancelationReason.exists() implies (Appointment.status='no-show' or Appointment.status='cancelled')
dom-2	error	Appointment	If the resource is contained in another resource, it SHALL NOT contain nested Resources	contained.contained.empty()
dom-3	error	Appointment	If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource	contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()
dom-4	error	Appointment	If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated	contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()
dom-5	error	Appointment	If a resource is contained in another resource, it SHALL NOT have a security label	contained.meta.security.empty()
dom-6	best practice	Appointment	A resource should have narrative for robust management	text.`div`.exists()
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children	hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both	extension.exists() != value.exists()
full-datetime-with-timezone	error	Appointment.created	DateTime must be ISO 8601 format with time and timezone (e.g., 2026-01-01T00:00:00+13:00 or 2026-01-01T00:00:00Z). Date-only values are not accepted.	toString().matches('^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\\.[0-9]+)?(Z|[+-][0-9]{2}:[0-9]{2})$')
hpi-location-url-format	error	Appointment.meta.source	Reference must be an HPI facility URL with format https://standards.digital.health.nz/ns/hpi-facility-id/FZZ111-A	matches('^https://standards.digital.health.nz/ns/hpi-facility-id/F[A-Za-z0-9]{2}[0-9]{3}-[A-Za-z0-9]$')
hpiOrganizationIdPattern	error	Appointment.supportingInformation.identifier	HPI Organisation ID must conform to format (GXXnnn-C).	system = 'https://standards.digital.health.nz/ns/hpi-organisation-id' implies value.matches('^G[a-zA-Z0-9]{2}[0-9]{3}-[a-zA-Z0-9]$')
nhi-value-format	error	Appointment.participant:patient.actor.identifier.value	Reference must be an NHI Patient URL with format ZZZ1111 or ZZZ11AA	matches('^[A-Z]{3}([0-9]{4}|[0-9]{2}[A-Z]{2})$')
patient-or-data-absent-reason	error	Appointment	Either a patient participant must be present, or a participant with a data-absent-reason extension on actor must be provided, but not both.	participant.where(actor.type = 'Patient').exists() xor participant.where(actor.extension.where(url = 'http://hl7.org/fhir/StructureDefinition/data-absent-reason').exists()).exists()

Summary

Mandatory: 12 elements(7 nested mandatory elements)
Fixed: 1 element
Prohibited: 11 elements

Structures

This structure refers to these other structures:

• NZ Patient (http://hl7.org.nz/fhir/StructureDefinition/NzPatient)

Slices

This structure defines the following Slices:

• The element 1 is sliced based on the value of Appointment.meta.tag
• The element 1 is sliced based on the value of Appointment.participant