Healthcare Interoperability Standards: Comprehensive Guide to FHIR, HL7v2, X12, and DICOM

Details

This guide offers a comprehensive reference covering the major healthcare interoperability standards encountered by developers building health IT software. Each standard exists because it solves a different problem. **HL7 Version 2 (HL7v2)** is the most widely deployed messaging standard, handling event-driven data exchange between clinical systems (e.g., ADT for admission/discharge, ORM for orders). While FHIR is replacing it for new applications, HL7v2 remains in production use. **FHIR (Fast Healthcare Interoperability Resources)** is the modern standard, providing a RESTful API framework. Instead of message-based exchange, FHIR treats clinical data as resources that can be accessed and manipulated using standard HTTP methods (GET, POST). This facilitates managing patient demographics, observations, and diagnostic reports. **X12 EDI** is the mandated standard for administrative transactions in the U.S., covering insurance claims, eligibility checks, and payment remittances. It utilizes specific transaction sets like 837P (professional claim) and 270 (eligibility inquiry). The guide emphasizes that developers must select the appropriate standard based on the required function.