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ICD-10 CM Code G21
G21
Secondary parkinsonism
G21.0
Malignant neuroleptic syndrome
G21.1
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
Excludes Type 1
dementia with Parkinsonism (G31.83)
Huntington's disease (G10)
Shy-Drager syndrome (G90.3)
syphilitic Parkinsonism (A52.19)
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