Prior authorization is becoming an API.
In the United States, prior authorization still largely runs on fax, phone calls and payer portals. The CMS Interoperability and Prior Authorization Final Rule (CMS-0057-F) changes the default: since 2026, impacted payers must decide within set timeframes and publish prior-authorization metrics, and by January 2027 most of them must offer a FHIR-based Prior Authorization API. Every EHR, revenue-cycle platform and health-API company now needs a clear way to say what it connects. The domain says it in three words.
Market context — 2026