Definition of FHIR
FHIR, which stands for Fast Healthcare Interoperability Resources, is a modern standard for exchanging healthcare information electronically. Developed and maintained by HL7 International, FHIR uses the same web technologies that power everyday internet applications — REST APIs, JSON, XML, and OAuth — making healthcare data exchange faster, cheaper, and far more developer-friendly than its predecessors.
FHIR was first published in 2014 and has rapidly become the dominant standard for new healthcare interoperability work. It is now mandated by both the Centers for Medicare & Medicaid Services (CMS) and the Office of the National Coordinator for Health IT (ONC) for patient data access in the United States.
In simple terms: FHIR is the modern API standard that lets healthcare systems share patient data the same way apps share data on the internet.
How FHIR Works in Healthcare
FHIR organizes health data into modular units called Resources. Each resource represents a specific clinical or administrative concept — a patient, a medication, a lab result, an appointment. There are over 150 FHIR resources defined in the standard.
These resources are accessed and exchanged using standard HTTP methods — the same ones used by any web API:
Example: To retrieve a patient record from a FHIR server, a developer simply makes an API call like:
GET https://fhir.example.com/Patient/12345The server returns a structured JSON response containing the patient’s demographics, identifiers, and contact information — in a format any developer can immediately work with.
This is fundamentally different from older HL7v2 interfaces, which required specialized parsing of pipe-delimited messages and often custom middleware to translate between systems.
Key FHIR Standards and Specifications
FHIR has gone through several versions. Here’s what matters in practice:
Implementation Considerations
How Taction Helps with FHIR
Taction’s engineering team builds production FHIR systems across the full stack — from FHIR server setup and EHR integration to patient-facing apps and regulatory compliance.
What we do:
Whether you’re building a new FHIR-based product from scratch, integrating with a payer or provider FHIR API, or ensuring your platform meets CMS interoperability mandates, Taction’s team has done it before.