Centers for Medicare and Medicaid Services

The Centers for Medicare and Medicaid Services (CMS) provides a suite of public REST APIs enabling developers to access Medicare provider data, quality measures, drug spending, health plan finder, beneficiary claims, and public health insurance datasets. CMS APIs support interoperability standards including HL7 FHIR and OAuth 2.0 to power healthcare applications across the US health system.

Centers for Medicare and Medicaid Services publishes 11 APIs on the APIs.io network, including API Reference API, Bulk Data API, Code Search API, and 8 more. Tagged areas include Medicare, Medicaid, Healthcare, Health Insurance, and FHIR.

The Centers for Medicare and Medicaid Services catalog on APIs.io includes 2 JSON-LD contexts and 1 Spectral governance ruleset.

Centers for Medicare and Medicaid Services’ developer surface includes authentication, developer portal, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

36.7/100 thin ▼ -7.9 Agent 31/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessFreeOpen⚡ Free to try

16 APIs

MedicareMedicaidHealthcareHealth InsuranceFHIRFederal GovernmentDrug SpendingProvider DataQuality MeasuresClaims Data

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 36.7/100 · thin

Contract Quality 12.5 / 25

Developer Ergonomics 3.9 / 20

Commercial Clarity 7.9 / 20

Operational Transparency 0.7 / 13

Governance 7.0 / 12

Discoverability 7.4 / 10

Agent readiness — 31/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/cms: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 16

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

Rate Limits

0 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

JSON Schema 93

Standalone JSON Schema definitions for this provider's data models.

Scroll for all 93

Examples 10

Example request and response payloads for these APIs.

Scroll for all 10

Get Started 2

Portal, sign-up, and the first successful call

Portal

Portal

DataPortal

DataPortal

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Other 3

Properties that don't map to a standard resource type

ProviderDataCatalog

ProviderDataCatalog

InteroperabilityGuidance

InteroperabilityGuidance

PublicDatasets

PublicDatasets

Source (apis.yml)

aid: cms
name: Centers for Medicare and Medicaid Services
description: The Centers for Medicare and Medicaid Services (CMS) provides a suite of public REST APIs enabling developers
  to access Medicare provider data, quality measures, drug spending, health plan finder, beneficiary claims, and public health
  insurance datasets. CMS APIs support interoperability standards including HL7 FHIR and OAuth 2.0 to power healthcare applications
  across the US health system.
type: Index
accessModel:
  pricing: free
  onboarding: open
  trial: false
  try_now: true
  public: true
  label: Free · Open access
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/cms.png
url: https://raw.githubusercontent.com/api-evangelist/cms/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.19'
tags:
- Medicare
- Medicaid
- Healthcare
- Health Insurance
- FHIR
- Federal Government
- Drug Spending
- Provider Data
- Quality Measures
- Claims Data
apis:
- name: CMS Beneficiary Claims Data API (BCDA)
  description: Enables Medicare Accountable Care Organizations (ACOs) and alternative payment model participants to retrieve
    Medicare Part A, B, and D claims data for their attributed enrollees. Implements the HL7 Bulk FHIR Implementation Guide
    and delivers NDJSON formatted claims data updated at least weekly.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://bcda.cms.gov/
  baseURL: https://bcda.cms.gov
  tags:
  - Medicare
  - ACO
  - Claims Data
  - FHIR
  - Bulk Data
  - Part A
  - Part B
  - Part D
  properties:
  - type: Documentation
    url: https://bcda.cms.gov/api-documentation.html
  - type: GitHubRepository
    url: https://github.com/CMSgov/bcda-app
  contact:
  - FN: BCDA Developer Community
    url: https://groups.google.com/g/bc-api
- name: CMS AB2D API (Claims Data to Part D Sponsors)
  description: Enables stand-alone Medicare Part D Prescription Drug Plan sponsors to retrieve bulk Medicare Part A and B
    claims data for their active beneficiaries using the FHIR standard in NDJSON format. Authenticates via Okta-based OAuth
    2.0 bearer tokens.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://ab2d.cms.gov/
  baseURL: https://api.ab2d.cms.gov
  tags:
  - Medicare
  - Part D
  - Claims Data
  - FHIR
  - Bulk Data
  - Prescription Drug Plans
  properties:
  - type: Documentation
    url: https://ab2d.cms.gov/api-documentation
  - type: AdvancedGuide
    url: https://ab2d.cms.gov/advanced-user-guide.html
- name: CMS Data at the Point of Care (DPC) API
  description: Provides Original Medicare claims data to fee-for-service Medicare providers in a structured, standardized
    FHIR format at the point of care. Helps providers gain complete views of patient medical histories to improve care coordination
    and reduce redundant testing.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://dpc.cms.gov/
  baseURL: https://sandbox.dpc.cms.gov
  tags:
  - Medicare
  - FHIR
  - Provider
  - Point of Care
  - Claims Data
  - Care Coordination
  properties:
  - type: Documentation
    url: https://dpc.cms.gov/docsV1
  - type: GitHubRepository
    url: https://github.com/CMSgov/dpc-app
  contact:
  - FN: DPC API Developer Group
    url: https://groups.google.com/d/forum/dpc-api
- name: CMS Finder API
  description: The API behind Finder.Healthcare.gov that helps users find private health plans available outside the Health
    Insurance Marketplace. Supports individual plan lookups, small group plan searches, and geographic lookups by ZIP code.
    Rate limited to 1000 requests per minute.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developer.cms.gov/finder-api/
  baseURL: https://finder.healthcare.gov
  tags:
  - Health Insurance
  - Plan Finder
  - Individual Plans
  - Small Group Plans
  - Healthcare.gov
  properties:
  - type: Documentation
    url: https://finder.healthcare.gov/#services
  - type: Authentication
    url: https://developer.cms.gov/finder-api/key-request.html
- name: CMS Quality Payment Program (QPP) Submissions API
  description: Enables QPP participants to submit quality performance data and receive real-time performance scoring feedback.
    Supports Merit-based Incentive Payment System (MIPS) and Advanced Alternative Payment Model (APM) data submissions for
    Medicare quality reporting.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://cmsgov.github.io/qpp-submissions-docs/
  baseURL: https://qpp.cms.gov/api
  tags:
  - Quality Payment Program
  - QPP
  - MIPS
  - APM
  - Medicare Quality
  - Performance Scoring
  properties:
  - type: Documentation
    url: https://cmsgov.github.io/qpp-submissions-docs/
- aid: cms:cms-api-reference-api
  name: Centers for Medicare and Medicaid Services API Reference API
  description: Information about the state of Marketplace API.
  humanURL: https://developer.cms.gov/marketplace-api/
  baseURL: https://marketplace.api.healthcare.gov/api/v1
  tags:
  - API Reference
  properties:
  - type: OpenAPI
    url: openapi/cms-api-reference-api-openapi.yml
  - type: Documentation
    url: https://developer.cms.gov/marketplace-api/
  - type: Authentication
    url: https://developer.cms.gov/marketplace-api/key-request.html
  - type: Documentation
    url: https://bluebutton.cms.gov/api-documentation
  - type: Sandbox
    url: https://sandbox.bluebutton.cms.gov/v1/accounts/login
  - type: GitHubRepository
    url: https://github.com/CMSgov/bluebutton-web-server
  - type: Documentation
    url: https://developer.cms.gov/ppl-api/
- aid: cms:cms-bulk-data-api
  name: Centers for Medicare and Medicaid Services Bulk Data API
  description: Information about the bulk data json files maintained by Marketplace API.
  humanURL: https://developer.cms.gov/marketplace-api/
  baseURL: https://marketplace.api.healthcare.gov/api/v1
  tags:
  - Bulk Data
  properties:
  - type: OpenAPI
    url: openapi/cms-bulk-data-api-openapi.yml
  - type: Documentation
    url: https://developer.cms.gov/marketplace-api/
  - type: Authentication
    url: https://developer.cms.gov/marketplace-api/key-request.html
  - type: Documentation
    url: https://bluebutton.cms.gov/api-documentation
  - type: Sandbox
    url: https://sandbox.bluebutton.cms.gov/v1/accounts/login
  - type: GitHubRepository
    url: https://github.com/CMSgov/bluebutton-web-server
  - type: Documentation
    url: https://developer.cms.gov/ppl-api/
- aid: cms:cms-code-search-api
  name: Centers for Medicare and Medicaid Services Code Search API
  description: Search CPT/HCPCS codes by procedure codes or terms describing medical procedures. Get code details for a given
    procedure code.
  humanURL: https://developer.cms.gov/marketplace-api/
  baseURL: https://marketplace.api.healthcare.gov/api/v1
  tags:
  - Code Search
  properties:
  - type: OpenAPI
    url: openapi/cms-code-search-api-openapi.yml
  - type: Documentation
    url: https://developer.cms.gov/marketplace-api/
  - type: Authentication
    url: https://developer.cms.gov/marketplace-api/key-request.html
  - type: Documentation
    url: https://bluebutton.cms.gov/api-documentation
  - type: Sandbox
    url: https://sandbox.bluebutton.cms.gov/v1/accounts/login
  - type: GitHubRepository
    url: https://github.com/CMSgov/bluebutton-web-server
  - type: Documentation
    url: https://developer.cms.gov/ppl-api/
- aid: cms:cms-cost-search-api
  name: Centers for Medicare and Medicaid Services Cost Search API
  description: For a given procedure code or entire set of codes, get national averages for the amount Medicare pays hospitals
    or surgical centers, and the national average copay amounts.
  humanURL: https://developer.cms.gov/marketplace-api/
  baseURL: https://marketplace.api.healthcare.gov/api/v1
  tags:
  - Cost Search
  properties:
  - type: OpenAPI
    url: openapi/cms-cost-search-api-openapi.yml
  - type: Documentation
    url: https://developer.cms.gov/marketplace-api/
  - type: Authentication
    url: https://developer.cms.gov/marketplace-api/key-request.html
  - type: Documentation
    url: https://bluebutton.cms.gov/api-documentation
  - type: Sandbox
    url: https://sandbox.bluebutton.cms.gov/v1/accounts/login
  - type: GitHubRepository
    url: https://github.com/CMSgov/bluebutton-web-server
  - type: Documentation
    url: https://developer.cms.gov/ppl-api/
- aid: cms:cms-enrollments-api
  name: Centers for Medicare and Medicaid Services Enrollments API
  description: Enrollment grouping validation and information.
  humanURL: https://developer.cms.gov/marketplace-api/
  baseURL: https://marketplace.api.healthcare.gov/api/v1
  tags:
  - Enrollments
  properties:
  - type: OpenAPI
    url: openapi/cms-enrollments-api-openapi.yml
  - type: Documentation
    url: https://developer.cms.gov/marketplace-api/
  - type: Authentication
    url: https://developer.cms.gov/marketplace-api/key-request.html
  - type: Documentation
    url: https://bluebutton.cms.gov/api-documentation
  - type: Sandbox
    url: https://sandbox.bluebutton.cms.gov/v1/accounts/login
  - type: GitHubRepository
    url: https://github.com/CMSgov/bluebutton-web-server
  - type: Documentation
    url: https://developer.cms.gov/ppl-api/
- aid: cms:cms-geography-api
  name: Centers for Medicare and Medicaid Services Geography API
  description: Geographic data, including information on states, counties, and zipcodes.
  humanURL: https://developer.cms.gov/marketplace-api/
  baseURL: https://marketplace.api.healthcare.gov/api/v1
  tags:
  - Geography
  properties:
  - type: OpenAPI
    url: openapi/cms-geography-api-openapi.yml
  - type: Documentation
    url: https://developer.cms.gov/marketplace-api/
  - type: Authentication
    url: https://developer.cms.gov/marketplace-api/key-request.html
  - type: Documentation
    url: https://bluebutton.cms.gov/api-documentation
  - type: Sandbox
    url: https://sandbox.bluebutton.cms.gov/v1/accounts/login
  - type: GitHubRepository
    url: https://github.com/CMSgov/bluebutton-web-server
  - type: Documentation
    url: https://developer.cms.gov/ppl-api/
- aid: cms:cms-households-eligibility-api
  name: Centers for Medicare and Medicaid Services Households & Eligibility API
  description: Household specific calculations, including eligibility information, out of pocket costs, poverty levels, and
    cost benchmarks.
  humanURL: https://developer.cms.gov/marketplace-api/
  baseURL: https://marketplace.api.healthcare.gov/api/v1
  tags:
  - Households & Eligibility
  properties:
  - type: OpenAPI
    url: openapi/cms-households-eligibility-api-openapi.yml
  - type: Documentation
    url: https://developer.cms.gov/marketplace-api/
  - type: Authentication
    url: https://developer.cms.gov/marketplace-api/key-request.html
  - type: Documentation
    url: https://bluebutton.cms.gov/api-documentation
  - type: Sandbox
    url: https://sandbox.bluebutton.cms.gov/v1/accounts/login
  - type: GitHubRepository
    url: https://github.com/CMSgov/bluebutton-web-server
  - type: Documentation
    url: https://developer.cms.gov/ppl-api/
- aid: cms:cms-insurance-issuers-api
  name: Centers for Medicare and Medicaid Services Insurance Issuers API
  description: Data related to health insurance issuers on the marketplace.
  humanURL: https://developer.cms.gov/marketplace-api/
  baseURL: https://marketplace.api.healthcare.gov/api/v1
  tags:
  - Insurance Issuers
  properties:
  - type: OpenAPI
    url: openapi/cms-insurance-issuers-api-openapi.yml
  - type: Documentation
    url: https://developer.cms.gov/marketplace-api/
  - type: Authentication
    url: https://developer.cms.gov/marketplace-api/key-request.html
  - type: Documentation
    url: https://bluebutton.cms.gov/api-documentation
  - type: Sandbox
    url: https://sandbox.bluebutton.cms.gov/v1/accounts/login
  - type: GitHubRepository
    url: https://github.com/CMSgov/bluebutton-web-server
  - type: Documentation
    url: https://developer.cms.gov/ppl-api/
- aid: cms:cms-insurance-plans-api
  name: Centers for Medicare and Medicaid Services Insurance Plans API
  description: Data on both health and dental insurance plans.
  humanURL: https://developer.cms.gov/marketplace-api/
  baseURL: https://marketplace.api.healthcare.gov/api/v1
  tags:
  - Insurance Plans
  properties:
  - type: OpenAPI
    url: openapi/cms-insurance-plans-api-openapi.yml
  - type: Documentation
    url: https://developer.cms.gov/marketplace-api/
  - type: Authentication
    url: https://developer.cms.gov/marketplace-api/key-request.html
  - type: Documentation
    url: https://bluebutton.cms.gov/api-documentation
  - type: Sandbox
    url: https://sandbox.bluebutton.cms.gov/v1/accounts/login
  - type: GitHubRepository
    url: https://github.com/CMSgov/bluebutton-web-server
  - type: Documentation
    url: https://developer.cms.gov/ppl-api/
- aid: cms:cms-plans-api
  name: Centers for Medicare and Medicaid Services Plans API
  description: The Plans API from Centers for Medicare and Medicaid Services — 1 operation(s) for plans.
  humanURL: https://developer.cms.gov/marketplace-api/
  baseURL: https://marketplace.api.healthcare.gov/api/v1
  tags:
  - Plans
  properties:
  - type: OpenAPI
    url: openapi/cms-plans-api-openapi.yml
  - type: Documentation
    url: https://developer.cms.gov/marketplace-api/
  - type: Authentication
    url: https://developer.cms.gov/marketplace-api/key-request.html
  - type: Documentation
    url: https://bluebutton.cms.gov/api-documentation
  - type: Sandbox
    url: https://sandbox.bluebutton.cms.gov/v1/accounts/login
  - type: GitHubRepository
    url: https://github.com/CMSgov/bluebutton-web-server
  - type: Documentation
    url: https://developer.cms.gov/ppl-api/
- aid: cms:cms-provider-drug-coverage-api
  name: Centers for Medicare and Medicaid Services Provider & Drug Coverage API
  description: Lookup information on providers, drugs, and what is covered under what plans.
  humanURL: https://developer.cms.gov/marketplace-api/
  baseURL: https://marketplace.api.healthcare.gov/api/v1
  tags:
  - Provider & Drug Coverage
  properties:
  - type: OpenAPI
    url: openapi/cms-provider-drug-coverage-api-openapi.yml
  - type: Documentation
    url: https://developer.cms.gov/marketplace-api/
  - type: Authentication
    url: https://developer.cms.gov/marketplace-api/key-request.html
  - type: Documentation
    url: https://bluebutton.cms.gov/api-documentation
  - type: Sandbox
    url: https://sandbox.bluebutton.cms.gov/v1/accounts/login
  - type: GitHubRepository
    url: https://github.com/CMSgov/bluebutton-web-server
  - type: Documentation
    url: https://developer.cms.gov/ppl-api/
common:
- type: AgenticAccess
  url: agentic-access/cms-agentic-access.yml
- type: DomainSecurity
  url: security/cms-domain-security.yml
- type: Authentication
  url: authentication/cms-authentication.yml
- type: Portal
  url: https://developer.cms.gov/
- type: DataPortal
  url: https://data.cms.gov/
- type: ProviderDataCatalog
  url: https://data.cms.gov/provider-data/
- type: GitHubOrganization
  url: https://github.com/cmsgov
- type: InteroperabilityGuidance
  url: https://www.cms.gov/priorities/burden-reduction/overview/interoperability/implementation-guides-standards/application-programming-interfaces-apis-relevant-standards-implementation-guides-igs
- type: PublicDatasets
  url: https://www.cms.gov/data-research/cms-data/data-available-everyone
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Centers for Medicare and Medicaid Services

APIs 16

Pricing Plans 1

Rate Limits 1

FinOps 1

Semantic Vocabularies 2

Spectral Rules 1

JSON Schema 93

Examples 10

Security Posture 2

Agentic Access 1