HL7 Segments

Sections:

Components of an HL7 Message HL7 Delimiter Characters Determining the Message Type HL7 Segments

Repeating and Optional Segments Custom Segments Present but Null Fields Segment Groups Segment Grammar Notation

The following sections provide more information about segments in HL7 messages and how they are organized and used. The topics that are covered are:

Repeating and optional segments;
Custom segments, also known as Z-segments;
Present but null fields in segments;
Segment groups;
The standard segment grammar notation.

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