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CMS Medicare Opt Out Affidavits 2026-08-01

First release we loaded: 57,587 records. Effective 2026-08-01; published 2026-10-25, 0 h after the source.

Changed records

The first release we loaded: every record is new, so there is no change list.

Records are keyed as the API keys them (codes without the dot). JSON: GET /v1/changes?dataset=medicare-opt-out&version=2026-08-01 (Builder plan and up).