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ICD-10-CM-2023 Diagnosis Codes Overview
ICD-10-CM-2023 > G00-G99 > G20-G26 > G21
G20-G26
Extrapyramidal and movement disorders
G21

Secondary parkinsonism

Excl1.:
dementia with Parkinsonism (G31.83)
Huntington's disease (G10)
Shy-Drager syndrome (G90.3)
syphilitic Parkinsonism (A52.19)
G21.0
Malignant neuroleptic syndrome
Use add'l
code for adverse effect, if applicable, to identify drug (T43.3X5, T43.4X5, T43.505, T43.595)
Excl1.:
neuroleptic induced parkinsonism (G21.11)
G21.1

Other drug-induced secondary parkinsonism

G21.11
Neuroleptic induced parkinsonism
Use add'l
code for adverse effect, if applicable, to identify drug (T43.3X5, T43.4X5, T43.505, T43.595)
Excl1.:
malignant neuroleptic syndrome (G21.0)
G21.19
Other drug induced secondary parkinsonism
Info:
Other medication-induced parkinsonism
Use add'l
code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
G21.2
Secondary parkinsonism due to other external agents
Code first
(T51-T65) to identify external agent
G21.3
Postencephalitic parkinsonism
G21.4
Vascular parkinsonism
G21.8
Other secondary parkinsonism
G21.9
Secondary parkinsonism, unspecified

 

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