MCMedicalCodingSoftware
G21.1

G21.1: Other drug-induced secondary parkinsonism

Non-billable headerICD-10-CM

G21.1 is a non-billable header ICD-10-CM code for other drug-induced secondary parkinsonism. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 inherited from the categories above G21.1

A category’s note binds every code beneath it.

Written on G21: Secondary parkinsonism

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

Other codes that can never be billed with G21.1

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • G20.CParkinsonism, unspecified
  • G21.0Malignant neuroleptic syndrome

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead G21.1

2 child codes. Green means billable.

Other codes under G21

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.