CMS — Centers for Medicare & Medicaid Services · Authentication Profile

Cms Gov Authentication

Authentication

CMS — Centers for Medicare & Medicaid Services secures its APIs with apiKey, http, mutualTLS, and oauth2 across 4 declared security schemes, as derived from its OpenAPI definitions. OAuth 2.0 is offered via the authorizationCode flow(s).

HealthcareMedicareMedicaidFHIRBulk DataOpen DataGovernmentFederalClaimsInsuranceACAMarketplaceQuality

Methods: apiKey, http, mutualTLS, oauth2 Schemes: 4 OAuth flows: authorizationCode API key in: query

Security Schemes

BearerAuth http

scheme: bearer

MutualTLS mutualTLS

OAuth2 oauth2

· flows: authorizationCode

ApiKey apiKey

· in: query (apikey)

Source

Authentication Profile

generated: '2026-07-11'
method: derived
source: openapi/cms-gov-ab2d-openapi.yml, openapi/cms-gov-bcda-openapi.yml, openapi/cms-gov-bfd-openapi.yml,
  openapi/cms-gov-blue-button-2-openapi.yml, openapi/cms-gov-dpc-openapi.yml, openapi/cms-gov-marketplace-openapi.yml,
  openapi/cms-gov-qpp-openapi.yml
summary:
  types:
  - apiKey
  - http
  - mutualTLS
  - oauth2
  api_key_in:
  - query
  oauth2_flows:
  - authorizationCode
schemes:
- name: BearerAuth
  type: http
  scheme: bearer
  bearerFormat: JWT
  description: AB2D uses SMART Backend Services with okta-issued JWT bearer tokens.
  sources:
  - openapi/cms-gov-ab2d-openapi.yml
  - openapi/cms-gov-bcda-openapi.yml
  - openapi/cms-gov-dpc-openapi.yml
  - openapi/cms-gov-qpp-openapi.yml
- name: MutualTLS
  type: mutualTLS
  description: BFD requires X.509 client certificates issued by the CMS PKI; access is restricted
    to peering applications.
  sources:
  - openapi/cms-gov-bfd-openapi.yml
- name: OAuth2
  type: oauth2
  flows:
  - flow: authorizationCode
    authorizationUrl: https://api.bluebutton.cms.gov/v2/o/authorize/
    tokenUrl: https://api.bluebutton.cms.gov/v2/o/token/
    scopes: 4
  sources:
  - openapi/cms-gov-blue-button-2-openapi.yml
- name: ApiKey
  type: apiKey
  in: query
  parameter: apikey
  sources:
  - openapi/cms-gov-marketplace-openapi.yml