> ## Documentation Index > Fetch the complete documentation index at: https://docs.metriport.com/llms.txt > Use this file to discover all available pages before exploring further. # 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). ## Properties | Name | Required | Type | Description | | --------------------- | -------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------- | | identifier | No | [Identifier](/medical-api/fhir/data-types/identifier)\[] | External Ids for this item | | status | Yes | code | proposed / pending / booked / arrived / fulfilled / cancelled / noshow / entered-in-error / checked-in / waitlist | | cancelationReason | No | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept) | The coded reason for the appointment being cancelled | | serviceCategory | No | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)\[] | A broad categorization of the service that is to be performed during this appointment | | serviceType | No | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)\[] | The specific service that is to be performed during this appointment | | specialty | No | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)\[] | The specialty of a practitioner that would be required to perform the service requested in this appointment | | appointmentType | No | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept) | The style of appointment or patient that has been booked in the slot (not service type) | | reasonCode | No | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)\[] | Coded reason this appointment is scheduled | | reasonReference | No | Reference\<[Condition](/medical-api/fhir/resources/condition) / [Procedure](/medical-api/fhir/resources/procedure) / [Observation](/medical-api/fhir/resources/observation) / [ImmunizationRecommendation](/medical-api/fhir/resources/immunizationrecommendation)>\[] | Reason the appointment is to take place (resource) | | priority | No | unsignedInt | Used to make informed decisions if needing to re-prioritize | | description | No | string | Shown on a subject line in a meeting request, or appointment list | | supportingInformation | No | Reference\\[] | Additional information to support the appointment | | start | No | instant | When appointment is to take place | | end | No | instant | When appointment is to conclude | | minutesDuration | No | positiveInt | Can be less than start/end (e.g. estimate) | | slot | No | Reference\<[Slot](/medical-api/fhir/resources/slot)>\[] | The slots that this appointment is filling | | created | No | dateTime | The date that this appointment was initially created | | comment | No | string | Additional comments | | patientInstruction | No | string | Detailed information and instructions for the patient | | basedOn | No | Reference\<[ServiceRequest](/medical-api/fhir/resources/servicerequest)>\[] | The service request this appointment is allocated to assess | | participant | Yes | AppointmentParticipant | Participants involved in appointment | | - id | No | string | Unique id for inter-element referencing | | - extension | No | [Extension](/medical-api/fhir/data-types/extension)\[] | Additional content defined by implementations | | - modifierExtension | No | [Extension](/medical-api/fhir/data-types/extension)\[] | Extensions that cannot be ignored even if unrecognized | | - type | No | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)\[] | Role of participant in the appointment | | - actor | No | Reference\<[Patient](/medical-api/fhir/resources/patient) / [Practitioner](/medical-api/fhir/resources/practitioner) / [PractitionerRole](/medical-api/fhir/resources/practitionerrole) / [RelatedPerson](/medical-api/fhir/resources/relatedperson) / [Device](/medical-api/fhir/resources/device) / [HealthcareService](/medical-api/fhir/resources/healthcareservice) / [Location](/medical-api/fhir/resources/location)> | Person, Location/HealthcareService or Device | | - required | No | code | required / optional / information-only | | - status | Yes | code | accepted / declined / tentative / needs-action | | - period | No | [Period](/medical-api/fhir/data-types/period) | Participation period of the actor | | requestedPeriod | No | [Period](/medical-api/fhir/data-types/period)\[] | Potential date/time interval(s) requested to allocate the appointment within | ## Search Parameters | Name | Type | Description | Expression | | ---------------- | --------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------- | | actor | reference | Any one of the individuals participating in the appointment | Appointment.participant.actor | | appointment-type | token | The style of appointment or patient that has been booked in the slot (not service type) | Appointment.appointmentType | | based-on | reference | The service request this appointment is allocated to assess | Appointment.basedOn | | date | date | Appointment date/time. | Appointment.start | | identifier | token | An Identifier of the Appointment | Appointment.identifier | | location | reference | This location is listed in the participants of the appointment | Appointment.participant.actor | | part-status | token | The Participation status of the subject, or other participant on the appointment. Can be used to locate participants that have not responded to meeting requests. | Appointment.participant.status | | patient | reference | One of the individuals of the appointment is this patient | Appointment.participant.actor | | practitioner | reference | One of the individuals of the appointment is this practitioner | Appointment.participant.actor | | reason-code | token | Coded reason this appointment is scheduled | Appointment.reasonCode | | reason-reference | reference | Reason the appointment is to take place (resource) | Appointment.reasonReference | | service-category | token | A broad categorization of the service that is to be performed during this appointment | Appointment.serviceCategory | | service-type | token | The specific service that is to be performed during this appointment | Appointment.serviceType | | slot | reference | The slots that this appointment is filling | Appointment.slot | | specialty | token | The specialty of a practitioner that would be required to perform the service requested in this appointment | Appointment.specialty | | status | token | The overall status of the appointment | Appointment.status | | supporting-info | reference | Additional information to support the appointment | Appointment.supportingInformation | ## Inherited Properties | Name | Required | Type | Description | | ----------------- | -------- | ------------------------------------------------------ | ------------------------------------------------------ | | id | No | string | Logical id of this artifact | | meta | No | [Meta](/medical-api/fhir/data-types/meta) | Metadata about the resource | | implicitRules | No | uri | A set of rules under which this content was created | | language | No | code | Language of the resource content | | text | No | [Narrative](/medical-api/fhir/data-types/narrative) | Text summary of the resource, for human interpretation | | contained | No | Resource\[] | Contained, inline Resources | | extension | No | [Extension](/medical-api/fhir/data-types/extension)\[] | Additional content defined by implementations | | modifierExtension | No | [Extension](/medical-api/fhir/data-types/extension)\[] | Extensions that cannot be ignored | To view the FHIR specification for this resource, see [Appointment](https://www.hl7.org/fhir/StructureDefinition/Appointment).