Centers for Medicare and Medicaid Services

The Centers for Medicare and Medicaid Services (CMS) is the federal agency that provides health coverage to more than 160 million Americans through Medicare, Medicaid, the Children's Health Insurance Program (CHIP), and the Health Insurance Marketplace. CMS operates one of the largest public API programs in the U.S. government, including the FHIR-based Blue Button 2.0, Beneficiary Claims Data API (BCDA), and Data at the Point of Care (DPC); the data.cms.gov Socrata Open Data API covering Medicare claims, provider, and enrollment datasets; the Medicare Provider Data Catalog (Hospital Compare, Nursing Home Compare); the Healthcare.gov Marketplace API; NPPES and NPI Registry APIs; the QPP Measures API; and Medicaid Transformed Medicaid Statistical Information System (T-MSIS) resources.