openapi: 3.0.3
info:
  title: CMS AB2D API
  description: |
    AB2D delivers Medicare Parts A, B, and D claims data to Part D Prescription Drug Plan
    sponsors via the HL7 FHIR Bulk Data Access specification. Asynchronous $export returns
    ExplanationOfBenefit NDJSON for all enrolled Medicare beneficiaries since 2020.
  version: '2.0'
  contact:
    name: AB2D Help
    url: https://ab2d.cms.gov/
    email: ab2d@cms.hhs.gov
  license:
    name: Public Domain (U.S. Government Work)
    url: https://www.usa.gov/government-works
servers:
- url: https://api.ab2d.cms.gov/api/v2
  description: Production
- url: https://sandbox.ab2d.cms.gov/api/v2
  description: Sandbox
security:
- BearerAuth: []
paths:
  /Patient/$export:
    get:
      summary: Export Patient Claims
      operationId: exportPatient
      description: Asynchronously kick off a bulk export of ExplanationOfBenefit resources.
      tags: [Bulk Export]
      parameters:
      - { name: _type, in: query, schema: { type: string, default: ExplanationOfBenefit } }
      - { name: _since, in: query, schema: { type: string, format: date-time } }
      - { name: _outputFormat, in: query, schema: { type: string, enum: ['application/fhir+ndjson', 'application/ndjson', 'ndjson'] } }
      - { name: Prefer, in: header, required: true, schema: { type: string, enum: ['respond-async'] } }
      - { name: Accept, in: header, required: true, schema: { type: string } }
      responses:
        '202':
          description: Export job created; poll Content-Location.
          headers:
            Content-Location: { schema: { type: string, format: uri } }
  /Group/{contractId}/$export:
    get:
      summary: Export Contract Population
      operationId: exportContract
      tags: [Bulk Export]
      parameters:
      - { name: contractId, in: path, required: true, schema: { type: string } }
      - { name: _type, in: query, schema: { type: string } }
      - { name: _since, in: query, schema: { type: string, format: date-time } }
      - { name: Prefer, in: header, required: true, schema: { type: string } }
      responses:
        '202': { description: Accepted }
  /Job/{jobUuid}/$status:
    get:
      summary: Get Job Status
      operationId: getJobStatus
      tags: [Bulk Export]
      parameters:
      - { name: jobUuid, in: path, required: true, schema: { type: string, format: uuid } }
      responses:
        '200':
          description: Job complete with manifest
          content:
            application/json:
              schema:
                type: object
                properties:
                  transactionTime: { type: string, format: date-time }
                  output: { type: array, items: { type: object } }
                  error: { type: array, items: { type: object } }
        '202': { description: Job still processing }
    delete:
      summary: Cancel Job
      operationId: cancelJob
      tags: [Bulk Export]
      parameters:
      - { name: jobUuid, in: path, required: true, schema: { type: string, format: uuid } }
      responses:
        '202': { description: Cancelled }
  /Job/{jobUuid}/file/{filename}:
    get:
      summary: Download Job Output File
      operationId: downloadOutput
      tags: [Bulk Export]
      parameters:
      - { name: jobUuid, in: path, required: true, schema: { type: string, format: uuid } }
      - { name: filename, in: path, required: true, schema: { type: string } }
      responses:
        '200':
          description: NDJSON file
          content:
            application/fhir+ndjson:
              schema: { type: string, format: binary }
components:
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: AB2D uses SMART Backend Services with okta-issued JWT bearer tokens.