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Each HL7 segment consists of one or more fields of data. To reduce the size of the HL7 message, the fields are encoded using either:

  • Standardized codes that are provided by HL7 or other organizations such as ISO
  • User-defined codes

This guide lists the user-defined code sets employed in a standard Orion Health solution implementation. The code sets are stored in Enterprise Master Patient Index (EMPI) or the Orion Health terminology service. Participants and vendors must use these code sets to convert the local codes in their HL7 messages so that they can be processed correctly.


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