Search Browse Crosswalk Fees Tools Pricing

Codelle

AI-powered medical coding assistant for healthcare practices and billers.

Pricing Privacy Terms

© 2026 Codelle. All rights reserved.

CPT® copyright 2026 American Medical Association. All rights reserved. CPT is a registered trademark of the American Medical Association. Applicable FARS/DFARS restrictions apply to government use. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use.

ICD-10-CM G21 — Secondary parkinsonism | Codelle

G21

ICD-10-CM

Secondary parkinsonism

Clinical Notes

Excludes 1 — Not coded here

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

Code Hierarchy

Subcodes (7)

G21.0Malignant neuroleptic syndrome

G21.1Other drug-induced secondary parkinsonism

G21.2Secondary parkinsonism due to other external agents

G21.3Postencephalitic parkinsonism

G21.4Vascular parkinsonism

G21.8Other secondary parkinsonism

G21.9Secondary parkinsonism, unspecified

Same Category

G21.0Malignant neuroleptic syndrome G21.1Other drug-induced secondary parkinsonism G21.11Neuroleptic induced parkinsonism G21.19Other drug induced secondary parkinsonism G21.2Secondary parkinsonism due to other external agents G21.3Postencephalitic parkinsonism G21.4Vascular parkinsonism

G21.8Other secondary parkinsonism

G21.9Secondary parkinsonism, unspecified