This reference lists every HL7 v2.4 segment with its fields, components and subcomponents, including names, data types and optionality codes (R = required, O = optional, C = conditional, B = backward compatible).
Free Resources
- HL7 Version 2.x Standard - The official HL7 v2 specification covering message structure, segment definitions and trigger events.
- hl7-dictionary (npm) - Complete HL7 v2.x segment, field and datatype definitions as JSON.
- HAPI HL7v2 Library - Open-source Java library for parsing and generating HL7 v2 messages.
- NextGen Connect (Mirth) - Free, open-source HL7 interface engine.
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