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FHIR R6 is coming. What changes, what moves, and what to do now

calendar_today June 25, 2026 person Ward Weistra domain firely-server

FHIR R4 has been the interoperability baseline for the better part of a decade. Most national programs, most payer mandates, most implementation guides in active use today were built on R4. That is not going to change overnight.

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