G21 SECONDARY PARKINSONISM

Code Information

Diagnosis Code: G21

Short Description: Secondary parkinsonism

Long Description: Secondary parkinsonism

The code G21 is NOT VALID for claim submission

Code Classification:

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

Code Version: 2022 ICD-10-CM

The code G21 has the following ICD-10-CM references to the Index of Diseases and Injuries

Type 1 Excludes Notes:
- dementia with Parkinsonism (@G31.83*)
- Huntington's disease (@G10*)
- Shy-Drager syndrome (@G90.3*)
- syphilitic Parkinsonism (@A52.19*)

ICD-10 Code	ICD-10 Description
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
G21.3	Postencephalitic parkinsonism
G21.4	Vascular parkinsonism
G21.8	Other secondary parkinsonism
G21.9	Secondary parkinsonism, unspecified

This page was last updated on: 10/1/2023