CMS-0057-F
CMS Interoperability and Prior Authorization Final Rule
CMS-0057-F requires impacted US payers to stand up four FHIR APIs — Patient Access, Provider Access, Payer-to-Payer, and Prior Authorization (PARDD) — with API compliance generally due January 1, 2027.
CMS-0057-F, the CMS Interoperability and Prior Authorization Final Rule, is the dominant near-term demand driver in US healthcare interoperability. It obligates impacted payers to build four FHIR APIs: Patient Access (expanded), Provider Access, Payer-to-Payer, and a Prior Authorization API (PARDD).
The timeline is staged. Operational provisions — including specific denial reasons, shortened decision timeframes (7 calendar days for standard, 72 hours for expedited), and public prior-authorization metrics reporting — generally begin January 1, 2026, while the API development and enhancement requirements are generally due January 1, 2027 (exact dates vary by payer type).
Roughly 365 parent payer organizations are impacted: Medicare Advantage organizations, state Medicaid and CHIP fee-for-service programs, Medicaid and CHIP managed-care plans, and QHP issuers on the Federally-Facilitated Exchanges. The mandated technical stack is FHIR R4.0.1, US Core STU 3.1.1, SMART App Launch 1.0.0, FHIR Bulk Data STU 1, OpenID Connect Core 1.0, and USCDI data content.
Readiness is uneven: an October 2025 WEDI survey found roughly 43% of payers and 47% of providers had not yet begun implementation — a large, deadline-pressured pool of buyers who need tooling now.
How this relates to Health1st
CMS-0057-F is a deadline, not a project. Health1st's Prior-Authorization Agent and Transformation Agent map internal payer data models to the mandated US Core FHIR stack and bridge legacy claims and clinical data into the four required APIs — the fastest path from "not started" to conformant.
Related terms
PARDD is the CMS-0057-F Prior Authorization API that lets providers query coverage requirements, gather documentation, and submit and track authorization decisions via FHIR.
A FHIR-based API that automates the prior-authorization workflow — checking requirements, gathering documentation, and exchanging decisions — as required by CMS-0057-F.
US Core is the HL7 implementation guide that constrains FHIR resources into the specific profiles US regulation requires, binding them to USCDI data elements.
Da Vinci is the HL7 accelerator that publishes FHIR implementation guides for payer–provider workflows, including prior authorization, coverage, and data exchange.
Bulk FHIR is the FHIR Bulk Data ("$export") specification for efficiently moving large populations of FHIR resources as NDJSON, used for analytics and payer-to-payer exchange.
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