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MSG-X12

Message Text. ANSI ASC X12 segment whose function is to carry free-form descriptive text on a line.

Definition

The MSG segment (Message Text) belongs to the ANSI ASC X12 segment directory. Its purpose: carry free-form descriptive text on a line.

Origin

Published by ASC X12 — the Accredited Standards Committee chartered by ANSI in 1979. Segments are released version by version (004010, 005010, 006020) and refined by Implementation Guides or TR3 documents (HIPAA).

Use

The MSG segment is used in X12 810 Invoice and 850 Purchase Order to attach a comment to a line. Like every X12 segment, it starts with its three-character identifier, followed by elements separated by the data element separator declared in the ISA.

  • ISA — X12 interchange header.
  • GS — functional group header.
  • ST — Transaction Set header.

Last updated: May 14, 2026