G21.3 POSTENCEPHALITIC PARKINSONISM

Code Information

Diagnosis Code: G21.3
Short Description: Postencephalitic parkinsonism
Long Description: Postencephalitic parkinsonism
Code Version: 2025 ICD-10-CM

The code G21.3 is VALID for claim submission

Code Classification

Diseases of the nervous system (G00–G99)
- Extrapyramidal and movement disorders (G20-G26)
  - Secondary parkinsonism (G21)

Synonyms

Postencephalitic parkinsonism
Post-encephalitic syndrome

Crosswalk Information

ICD-10 Code		ICD-9 Code	ICD-9 Description
G21.3		332.1	Secondary parkinsonism

This ICD-10 to ICD-9 data is based on the 2018 General Equivalency Mapping (GEM) files published by the Centers for Medicare & Medicaid Services (CMS) for informational purposes only. The data is not an ICD-10 conversion tool and doesn’t guarantee clinical accuracy.

Similar Codes

ICD-10 Code	ICD-10 Description
G21	Secondary parkinsonism
G21.0	Malignant neuroleptic syndrome
G21.1	Other drug-induced secondary parkinsonism
G21.11	Neuroleptic induced parkinsonism
G21.19	Other drug induced secondary parkinsonism
G21.2	Secondary parkinsonism due to other external agents
G21.4	Vascular parkinsonism
G21.8	Other secondary parkinsonism
G21.9	Secondary parkinsonism, unspecified

This page was last updated on: 10/1/2025

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