openapi: 3.2.0
info:
  title: CMS Blue Button 2.0 User Info API
  description: Blue Button 2.0 is the Centers for Medicare & Medicaid Services (CMS) patient-facing API that lets Medicare beneficiaries share their Parts A, B, and D claims data with applications they authorize.
  version: '2.0'
  contact:
    name: CMS Blue Button 2.0
    url: https://bluebutton.cms.gov
  termsOfService: https://bluebutton.cms.gov/terms/
servers:
- url: https://api.bluebutton.cms.gov/v2/fhir
  description: Production (approved applications only)
- url: https://sandbox.bluebutton.cms.gov/v2/fhir
  description: Sandbox (synthetic Medicare enrollee data, self-serve)
security:
- oauth2:
  - patient/ExplanationOfBenefit.read
  - patient/Patient.read
  - patient/Coverage.read
tags:
- name: User Info
  description: OpenID Connect userinfo for the authorizing beneficiary.
paths:
  /connect/userinfo:
    servers:
    - url: https://api.bluebutton.cms.gov/v2
      description: Production (userinfo lives outside the /fhir base path)
    - url: https://sandbox.bluebutton.cms.gov/v2
      description: Sandbox
    get:
      operationId: getUserInfo
      tags:
      - User Info
      summary: Retrieve the authorizing user's OpenID Connect profile
      description: Full path is /v2/connect/userinfo (outside the /fhir base). Returns the authorizing beneficiary's user profile (name, family name, email) when the openid and profile scopes were granted.
      responses:
        '200':
          description: OpenID Connect userinfo JSON.
          content:
            application/json:
              schema:
                type: object
                properties:
                  sub:
                    type: string
                  name:
                    type: string
                  given_name:
                    type: string
                  family_name:
                    type: string
                  email:
                    type: string
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  responses:
    Unauthorized:
      description: Missing, expired, or invalid OAuth 2.0 access token.
  securitySchemes:
    oauth2:
      type: oauth2
      description: OAuth 2.0 authorization-code flow with mandatory PKCE (S256 only). Beneficiaries log in with their Medicare.gov credentials and choose whether to share demographic data. Access tokens expire after 1 hour. One-time-use refresh tokens are issued only to approved 13-month and research application types. Sandbox uses https://sandbox.bluebutton.cms.gov/v2/o/authorize/ and https://sandbox.bluebutton.cms.gov/v2/o/token/.
      flows:
        authorizationCode:
          authorizationUrl: https://api.bluebutton.cms.gov/v2/o/authorize/
          tokenUrl: https://api.bluebutton.cms.gov/v2/o/token/
          refreshUrl: https://api.bluebutton.cms.gov/v2/o/token/
          scopes:
            patient/Patient.read: Read the beneficiary's Patient demographic resource.
            patient/ExplanationOfBenefit.read: Read the beneficiary's Medicare claims.
            patient/Coverage.read: Read the beneficiary's Medicare coverage.
            openid: OpenID Connect authentication.
            profile: Access the userinfo profile endpoint.
            launch/patient: Receive the patient FHIR id in the token response.