Canvas Medical Medication Prescribing

arazzo: 1.0.1
info:
  title: Canvas Medical Medication Prescribing
  summary: Read the patient, check existing allergies and active medications for safety, then write a new prescription and confirm it.
  description: >-
    A medication prescribing flow against the Canvas FHIR R4 API, following US Core
    Medication conventions. Before prescribing, the patient is read and their
    AllergyIntolerances and active MedicationRequests are pulled so an
    interaction / allergy check can be performed; a new MedicationRequest is then
    created and read back to confirm. 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: medication-prescribing
  summary: Prescribe a medication after an allergy and active-medication safety check.
  description: >-
    Reads the patient, retrieves allergies and active medications for a safety
    check, creates a MedicationRequest, and reads it back to confirm.
  inputs:
    type: object
    required:
    - patientId
    - medicationRequest
    properties:
      patientId:
        type: string
        description: The FHIR Patient id the prescription is for.
      medicationRequest:
        type: object
        description: The FHIR R4 MedicationRequest resource to create.
  steps:
  - stepId: readPatient
    description: Read the patient the prescription will be written for.
    operationId: readPatient
    parameters:
    - name: id
      in: path
      value: $inputs.patientId
    successCriteria:
    - condition: $statusCode == 200
  - stepId: checkAllergies
    description: Retrieve the patient's allergies for an allergy / contraindication check.
    operationId: searchAllergyIntolerance
    parameters:
    - name: patient
      in: query
      value: $inputs.patientId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      allergies: $response.body
  - stepId: checkActiveMedications
    description: Retrieve the patient's active medication orders for an interaction check.
    operationId: searchMedicationRequest
    parameters:
    - name: patient
      in: query
      value: $inputs.patientId
    - name: status
      in: query
      value: active
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      activeMedications: $response.body
  - stepId: createPrescription
    description: Create the new MedicationRequest for the patient.
    operationId: createMedicationRequest
    requestBody:
      contentType: application/fhir+json
      payload: $inputs.medicationRequest
    successCriteria:
    - condition: $statusCode == 201
    outputs:
      medicationRequestId: $response.body#/id
  - stepId: confirmPrescription
    description: Read the created MedicationRequest back to confirm it was written.
    operationId: readMedicationRequest
    parameters:
    - name: id
      in: path
      value: $steps.createPrescription.outputs.medicationRequestId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      medicationRequest: $response.body
  outputs:
    medicationRequestId: $steps.createPrescription.outputs.medicationRequestId
    medicationRequest: $steps.confirmPrescription.outputs.medicationRequest