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G20-G26
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G21
G21
Secondary parkinsonism
G21.0
Malignant neuroleptic syndrome
Billable
Notes
G21.1
Other drug-induced secondary parkinsonism
G21.2
Secondary parkinsonism due to other external agents
Billable
Notes
G21.3
Postencephalitic parkinsonism
Billable
Notes
G21.4
Vascular parkinsonism
Billable
Notes
G21.8
Other secondary parkinsonism
Billable
Notes
G21.9
Secondary parkinsonism, unspecified
Billable
Notes