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HL-X12

Hierarchical Level. ANSI ASC X12 segment whose function is to identify a level in a hierarchical structure.

Definition

The HL segment (Hierarchical Level) belongs to the ANSI ASC X12 segment directory. Its purpose: identify a level in a hierarchical structure.

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 HL segment is used in X12 856 ASN (Shipment-Order-Pack-Item hierarchy) and 837 Healthcare Claim. 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