ICD-10-CM › G00-G99 › G20-G26 › G codes › G21

G21

Secondary parkinsonism

Not billableICD-10-CM diagnosis code.

This code exists but cannot be submitted on its own. It groups the more specific codes beneath it.

A category header for its whole life, FY2016 onwards. It has never been valid for submission on its own.

Submit one of these 7 more specific codes instead:

  • G21.0 Malignant neuroleptic syndrome
  • G21.1 Other drug-induced secondary parkinsonism (also a header)
  • G21.2 Secondary parkinsonism due to other external agents
  • G21.3 Postencephalitic parkinsonism
  • G21.4 Vascular parkinsonism
  • G21.8 Other secondary parkinsonism
  • G21.9 Secondary parkinsonism, unspecified

What has happened to this code

Every change the publisher made, from 2012 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.

  1. FY2012 Added to the draft code set draft Secondary parkinsonism

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

This code

Excludes1 - never coded here

  • Huntington's disease (G10)
  • neurocognitive disorder with Lewy bodies (G31.83)
  • Shy-Drager syndrome (G90.3)
  • syphilitic Parkinsonism (A52.19)