arazzo: 1.0.1
info:
  title: Canvas Medical Patient Registration (Upsert)
  summary: Search for an existing patient by identifier and update it if found, otherwise create a new US Core Patient.
  description: >-
    A patient demographic upsert against the Canvas FHIR R4 API, following US Core
    Patient conventions. The patient is searched by a business identifier (for
    example an MRN); when a match is found the existing Patient is updated, and
    when no match is found a new Patient is created. This is the standard
    deduplicating intake step at the front of most clinical integrations. Every
    step inlines its request so the flow is self-contained.
  version: 1.0.0
sourceDescriptions:
- name: canvasFhir
  url: ../openapi/canvas-medical-fhir-api-openapi.yml
  type: openapi
workflows:
- workflowId: patient-registration-upsert
  summary: Upsert a US Core Patient by business identifier.
  description: >-
    Searches for a patient by identifier and branches to update the matched
    Patient or create a new one.
  inputs:
    type: object
    required:
    - identifier
    - patient
    properties:
      identifier:
        type: string
        description: Business identifier (e.g. system|value MRN) used to detect an existing patient.
      patient:
        type: object
        description: The FHIR R4 Patient resource to create or use as the update body.
  steps:
  - stepId: findPatient
    description: Search for an existing patient by business identifier.
    operationId: searchPatient
    parameters:
    - name: identifier
      in: query
      value: $inputs.identifier
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      matchedPatientId: $response.body#/entry/0/resource/id
    onSuccess:
    - name: patientExists
      type: goto
      stepId: updatePatient
      criteria:
      - context: $response.body
        condition: $.total > 0
        type: jsonpath
    - name: patientMissing
      type: goto
      stepId: createPatient
      criteria:
      - context: $response.body
        condition: $.total == 0
        type: jsonpath
  - stepId: updatePatient
    description: Update the matched Patient resource with the supplied demographics.
    operationId: updatePatient
    parameters:
    - name: id
      in: path
      value: $steps.findPatient.outputs.matchedPatientId
    requestBody:
      contentType: application/fhir+json
      payload: $inputs.patient
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      patientId: $response.body#/id
    onSuccess:
    - name: done
      type: end
  - stepId: createPatient
    description: Create a new Patient when no existing record matched the identifier.
    operationId: createPatient
    requestBody:
      contentType: application/fhir+json
      payload: $inputs.patient
    successCriteria:
    - condition: $statusCode == 201
    outputs:
      patientId: $response.body#/id
  outputs:
    updatedPatientId: $steps.updatePatient.outputs.patientId
    createdPatientId: $steps.createPatient.outputs.patientId