# CMS AB2D API (Claims Data to Part D Sponsors)

**Canonical:** https://apis.io/apis/cms/cms-ab2d-api-claims-data-to-part-d-sponsors/  
**Provider:** Centers for Medicare and Medicaid Services — https://apis.io/providers/cms/  
**Base URL:** https://api.ab2d.cms.gov  
**Documentation:** https://ab2d.cms.gov/

CMS AB2D API (Claims Data to Part D Sponsors) is one of 26 APIs that [Centers for Medicare and Medicaid Services](https://apis.io/providers/cms/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Medicare, Part D, Claims Data, FHIR, and Bulk Data. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, an API reference, a GitHub repository, and a support channel.

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.

## Machine-readable artifacts (10)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/cms/refs/heads/main/openapi/cms-ab2d-openapi.yml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/cms/refs/heads/main/overlays/cms-ab2d-overlay.yaml
- **AgentSkill** — https://raw.githubusercontent.com/api-evangelist/cms/refs/heads/main/skills/cms-export-partd-claims-ab2d.md
- **Documentation** — https://ab2d.cms.gov/api-documentation
- **APIReference** — https://sandbox.ab2d.cms.gov/swagger-ui/index.html
- **StatusPage** — https://ab2d.cms.gov/status
- **Sandbox** — https://sandbox.ab2d.cms.gov
- **GitHubRepository** — https://github.com/CMSgov/ab2d
- **Support** — https://groups.google.com/u/0/g/cms-ab2d-api
- **AdvancedGuide** — https://ab2d.cms.gov/advanced-user-guide.html

## Other Centers for Medicare and Medicaid Services APIs (12)

- [CMS Beneficiary Claims Data API (BCDA)](https://apis.io/apis/cms/cms-beneficiary-claims-data-api-bcda/)
- [CMS Data at the Point of Care (DPC) API](https://apis.io/apis/cms/cms-data-at-the-point-of-care-dpc-api/)
- [CMS Finder API](https://apis.io/apis/cms/cms-finder-api/)
- [CMS Quality Payment Program (QPP) Submissions API](https://apis.io/apis/cms/cms-quality-payment-program-qpp-submissions-api/)
- [Centers for Medicare and Medicaid Services API Reference API](https://apis.io/apis/cms/cms-api-reference-api/)
- [Centers for Medicare and Medicaid Services Bulk Data API](https://apis.io/apis/cms/cms-bulk-data-api/)
- [Centers for Medicare and Medicaid Services Code Search API](https://apis.io/apis/cms/cms-code-search-api/)
- [Centers for Medicare and Medicaid Services Cost Search API](https://apis.io/apis/cms/cms-cost-search-api/)
- [Centers for Medicare and Medicaid Services Enrollments API](https://apis.io/apis/cms/cms-enrollments-api/)
- [Centers for Medicare and Medicaid Services Geography API](https://apis.io/apis/cms/cms-geography-api/)
- [Centers for Medicare and Medicaid Services Households & Eligibility API](https://apis.io/apis/cms/cms-households-eligibility-api/)
- [Centers for Medicare and Medicaid Services Insurance Issuers API](https://apis.io/apis/cms/cms-insurance-issuers-api/)

## Tags

Medicare, Part D, Claims Data, FHIR, Bulk Data, Prescription Drug Plans

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/cms/cms-ab2d-api-claims-data-to-part-d-sponsors/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/cms/.