Format guide
FHIR
Fast Healthcare Interoperability Resources (HL7 R4)
FHIR is HL7's modern healthcare data standard — REST APIs over JSON resources (Patient, Observation, Condition, MedicationRequest, etc.) plus a Bundle wrapper for batch transfer. Released as Standard for Trial Use in 2014, R4 (current normative release) finalized 2019. Adopted by Apple Health, Epic's MyChart API, the U.S. ONC Cures Act 21st Century interoperability rules, every EHR vendor. Replacing HL7 v2 for new integrations though v2 remains dominant for legacy systems.
How to open a FHIR file
FHIR is JSON, so any text editor + JSON viewer. Specialized tools: Postman with FHIR collections, HAPI FHIR's reference server, Inferno test harness. Most modern EHRs expose FHIR endpoints directly via OAuth-secured REST.
Primary use
Modern healthcare API integrations and clinical data exchange.
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