Diseases of the nervous system G00G99

Extrapyramidal and movement disorders (G20-G26)

Parkinson's disease

Hemiparkinsonism Paralysis agitans

Parkinsonism or Parkinson's disease:

■ idiopathic

|_| Secondary parkinsonism

G21.0 Malignant neuroleptic syndrome

Use additional external cause code (Chapter XX), if desired, to identify drug.

G21.1 Other drug-induced secondary parkinsonism

Use additional external cause code (Chapter XX), if desired, to identify drug.

G21.2 Secondary parkinsonism due to other external agents

Use additional external cause code (Chapter XX), if desired, to identify external agent.

G21.3 Postencephalitic parkinsonism G21.8 Other secondary parkinsonism G21.9 Secondary parkinsonism, unspecified

I_I Other degenerative diseases of basal ganglia

Excludes: multi-system degeneration ( G90.3 ) G23.0 Hallervorden-Spatz disease

Pigmentary pallidal degeneration

G23.1 Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]

G23.2 Striatonigral degeneration

Parkinsonism in diseases classified elsewhere

Syphilitic parkinsonism ( A52.1+ )

Other specified degenerative diseases of basal ganglia

Calcification of basal ganglia

Degenerative disease of basal ganglia, unspecified

_ Dystonia

Includes: dyskinesia

Excludes: athetoid cerebral palsy ( G80.3 ) G24.0 Drug-induced dystonia

Use additional external cause code (Chapter XX), if desired, to identify drug. G24.1 Idiopathic familial dystonia

Idiopathic dystonia NOS G24.2 Idiopathic nonfamilial dystonia G24.3 Spasmodic torticollis

Excludes: torticollis NOS ( M43.6 ) G24.4 Idiopathic orofacial dystonia

Orofacial dyskinesia G24.5 Blepharospasm G24.8 Other dystonia G24.9 Dystonia, unspecified Dyskinesia NOS

_ Other extrapyramidal and movement disorders

G25.0 Essential tremor

Familial tremor

Excludes: tremor NOS ( R25.1 ) G25.1 Drug-induced tremor

Use additional external cause code (Chapter XX), if desired, to identify drug. G25.2 Other specified forms of tremor

Intention tremor G25.3 Myoclonus

Drug-induced myoclonus

Use additional external cause code (Chapter XX), if desired, to identify drug, if drug-induced.

Excludes: facial myokymia ( G51.4 ) myoclonic epilepsy ( G40.- )

G25.4 Drug-induced chorea

Use additional external cause code (Chapter XX), if desired, to identify drug. G25.5 Other chorea

Chorea NOS

G25.6

G25.8 G25.9

G26*

Excludes: chorea NOS with heart involvement ( I02.0 ) Huntington's chorea ( G10 ) rheumatic chorea ( I02.- ) Sydenham's chorea ( I02.- )

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