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The complete specification for the HL7 Version 2.x messages is in Appendix C. The following is a summary of the messages used in the various transactions. This section contains the required content according to this implementation guide. It is intended as a summary reference.

Proposal (Hans Buitendijk): Change MSH-4 and MSH-6 optional; pre-adopt MSH-22 and MSH-23 where MSH-22 is R and MSH-23 is RE.  This will allow distinction between physical facility vs. organization where we know organization to send the request/etc., but not the facility.

6.3.1 Base Data Types

The following data types represent a single value, and can be referenced directly from within a field in a given segment, or they can be components of a complex data type. When viewing the message and segment descriptions below, the expansion stops at a base data type.

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