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PWK

Paperwork. ANSI ASC X12 segment whose function is to identify a paperwork document attached to the transaction.

Definition

The PWK segment (Paperwork) belongs to the ANSI ASC X12 segment directory. Its purpose: identify a paperwork document attached to the transaction.

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 PWK segment is used in X12 837 Healthcare Claim under HIPAA to declare attached clinical documents. 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