openapi: 3.1.0
info:
  title: Varian ARIA FHIR AllergyIntolerance Observation API
  description: The Varian ARIA FHIR R4 API provides SMART on FHIR access to oncology clinical data from the ARIA Oncology Information System (OIS). Enables EHR systems, clinical applications, and research tools to access patient-level oncology data including conditions, procedures, observations, care plans, medication requests, and diagnostic reports. The API is read-only and supports standard FHIR R4 search operations. Varian is a Siemens Healthineers company.
  version: R4-6.0.101
  contact:
    name: Varian FHIR Developer Portal
    url: https://varian.dynamicfhir.com
  termsOfService: https://varian.dynamicfhir.com
  license:
    name: Proprietary
    url: https://www.varian.com
servers:
- url: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4
  description: Varian ARIA FHIR R4 API Server
security:
- OAuthSMARTonFHIR:
  - launch/patient
  - patient/Patient.read
  - patient/Condition.read
  - patient/Procedure.read
  - patient/Observation.read
tags:
- name: Observation
  description: Labs, vitals, and clinical measurements
paths:
  /Observation:
    get:
      operationId: searchObservations
      summary: Search Observations
      description: Search for clinical observations including lab results, vital signs, and treatment-related measurements for oncology patients.
      tags:
      - Observation
      parameters:
      - name: patient
        in: query
        required: true
        schema:
          type: string
        description: Patient reference
      - name: code
        in: query
        schema:
          type: string
        description: Observation LOINC or SNOMED code
      - name: date
        in: query
        schema:
          type: string
        description: Observation date
      - name: category
        in: query
        schema:
          type: string
        description: Observation category (laboratory, vital-signs, etc.)
      - name: _count
        in: query
        schema:
          type: integer
      responses:
        '200':
          description: Bundle of Observation resources
          content:
            application/fhir+json:
              schema:
                $ref: '#/components/schemas/Bundle'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /Observation/{id}:
    get:
      operationId: getObservation
      summary: Get Observation
      description: Retrieve a specific observation by ID.
      tags:
      - Observation
      parameters:
      - name: id
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Observation resource
          content:
            application/fhir+json:
              schema:
                $ref: '#/components/schemas/FHIRResource'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  responses:
    NotFound:
      description: Resource not found
      content:
        application/fhir+json:
          schema:
            $ref: '#/components/schemas/OperationOutcome'
    Unauthorized:
      description: Unauthorized — missing or invalid SMART on FHIR token
      content:
        application/fhir+json:
          schema:
            $ref: '#/components/schemas/OperationOutcome'
  schemas:
    Bundle:
      type: object
      description: FHIR Bundle containing search results
      properties:
        resourceType:
          type: string
          enum:
          - Bundle
        id:
          type: string
        meta:
          type: object
        type:
          type: string
          enum:
          - searchset
          - collection
        total:
          type: integer
          description: Total number of matching resources
        link:
          type: array
          items:
            type: object
            properties:
              relation:
                type: string
              url:
                type: string
                format: uri
        entry:
          type: array
          items:
            type: object
            properties:
              fullUrl:
                type: string
                format: uri
              resource:
                $ref: '#/components/schemas/FHIRResource'
              search:
                type: object
                properties:
                  mode:
                    type: string
    FHIRResource:
      type: object
      description: Generic FHIR R4 resource
      properties:
        resourceType:
          type: string
          description: FHIR resource type
        id:
          type: string
          description: Logical resource ID
        meta:
          type: object
          properties:
            versionId:
              type: string
            lastUpdated:
              type: string
              format: date-time
        text:
          type: object
          description: Human-readable narrative
      additionalProperties: true
    OperationOutcome:
      type: object
      description: FHIR OperationOutcome for errors
      properties:
        resourceType:
          type: string
          enum:
          - OperationOutcome
        issue:
          type: array
          items:
            type: object
            properties:
              severity:
                type: string
                enum:
                - fatal
                - error
                - warning
                - information
              code:
                type: string
              details:
                type: object
              diagnostics:
                type: string
  securitySchemes:
    OAuthSMARTonFHIR:
      type: oauth2
      description: SMART on FHIR OAuth 2.0 authorization
      flows:
        authorizationCode:
          authorizationUrl: https://varian-smart.dynamicfhir.com/core/connect/authorize
          tokenUrl: https://varian-smart.dynamicfhir.com/core/connect/token
          scopes:
            launch/patient: Patient context launch
            patient/Patient.read: Read patient demographics
            patient/Condition.read: Read patient conditions/diagnoses
            patient/Procedure.read: Read patient procedures
            patient/Observation.read: Read patient observations/labs
            patient/DiagnosticReport.read: Read diagnostic reports
            patient/CarePlan.read: Read care plans
            patient/MedicationRequest.read: Read medication requests
            patient/AllergyIntolerance.read: Read allergy records
            patient/DocumentReference.read: Read document references
            patient/Goal.read: Read treatment goals