ICD-10-CM Book 2026 Edition

Chapters  /  Chapter 6  /  G20-G26

Extrapyramidal and movement disorders (G20-G26)

G20 Parkinson's disease
Hemiparkinsonism
Idiopathic Parkinsonism or Parkinson's disease
Paralysis agitans
Primary Parkinsonism or Parkinson's disease
UseAdditionalCode code, if applicable, to identify:
dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4)
dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-)
dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3)
dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2)
dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0)
mild neurocognitive disorder due to known physiological condition (F06.7-)
G20.A Parkinson's disease without dyskinesia
G20.A1 Parkinson's disease without dyskinesia, without mention of fluctuations
Parkinson's disease NOS
Parkinson's disease without dyskinesia, without mention of OFF episodes
G20.A2 Parkinson's disease without dyskinesia, with fluctuations
Parkinson's disease without dyskinesia, with OFF episodes
G20.B Parkinson's disease with dyskinesia
Excludes1 drug induced dystonia (G24.0-)
G20.B1 Parkinson's disease with dyskinesia, without mention of fluctuations
Parkinson's disease with dyskinesia, without mention of OFF episodes
G20.B2 Parkinson's disease with dyskinesia, with fluctuations
Parkinson's disease with dyskinesia, with OFF episodes
G20.C Parkinsonism, unspecified
Parkinsonism, NOS
Excludes1 Parkinson's disease NOS (G20.A1)
Parkinson's disease with dyskinesia (G20.B-)
Parkinson's disease without dyskinesia (G20.A-)
secondary parkinsonism (G21.-)
G21 Secondary parkinsonism
Excludes1 Huntington's disease (G10)
neurocognitive disorder with Lewy bodies (G31.83)
Shy-Drager syndrome (G90.3)
syphilitic Parkinsonism (A52.19)
G21.0 Malignant neuroleptic syndrome
UseAdditionalCode code for adverse effect, if applicable, to identify drug (T43.3X5, T43.4X5, T43.505, T43.595)
Excludes1 neuroleptic induced parkinsonism (G21.11)
G21.1 Other drug-induced secondary parkinsonism
G21.11 Neuroleptic induced parkinsonism
UseAdditionalCode code for adverse effect, if applicable, to identify drug (T43.3X5, T43.4X5, T43.505, T43.595)
Excludes1 malignant neuroleptic syndrome (G21.0)
G21.19 Other drug induced secondary parkinsonism
Other medication-induced parkinsonism
UseAdditionalCode 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
CodeFirst (T51-T65) to identify external agent
G21.3 Postencephalitic parkinsonism
G21.4 Vascular parkinsonism
G21.8 Other secondary parkinsonism
G21.9 Secondary parkinsonism, unspecified
G23 Other degenerative diseases of basal ganglia
Excludes2 multi-system degeneration of the autonomic nervous system (G90.3)
G23.0 Hallervorden-Spatz disease
Pigmentary pallidal degeneration
G23.1 Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]
Progressive supranuclear palsy
G23.2 Striatonigral degeneration
G23.3 Hypomyelination with atrophy of the basal ganglia and cerebellum
H-ABC
TUBB4A-related neurologic disorders
G23.8 Other specified degenerative diseases of basal ganglia
Calcification of basal ganglia
G23.9 Degenerative disease of basal ganglia, unspecified
G24 Dystonia
Includes dyskinesia
Excludes2 athetoid cerebral palsy (G80.3)
G24.0 Drug induced dystonia
UseAdditionalCode code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
G24.01 Drug induced subacute dyskinesia
Drug induced blepharospasm
Drug induced orofacial dyskinesia
Neuroleptic induced tardive dyskinesia
Tardive dyskinesia
G24.02 Drug induced acute dystonia
Acute dystonic reaction to drugs
Neuroleptic induced acute dystonia
G24.09 Other drug induced dystonia
G24.1 Genetic torsion dystonia
Dystonia deformans progressiva
Dystonia musculorum deformans
Familial torsion dystonia
Idiopathic familial dystonia
Idiopathic (torsion) dystonia NOS
(Schwalbe-) Ziehen-Oppenheim disease
G24.2 Idiopathic nonfamilial dystonia
G24.3 Spasmodic torticollis
Excludes1 congenital torticollis (Q68.0)
hysterical torticollis (F44.4)
ocular torticollis (R29.891)
psychogenic torticollis (F45.8)
torticollis NOS (M43.6)
traumatic recurrent torticollis (S13.4)
G24.4 Idiopathic orofacial dystonia
Orofacial dyskinesia
Excludes1 drug induced orofacial dyskinesia (G24.01)
G24.5 Blepharospasm
Excludes1 drug induced blepharospasm (G24.01)
G24.8 Other dystonia
Acquired torsion dystonia NOS
G24.9 Dystonia, unspecified
Dyskinesia NOS
G25 Other extrapyramidal and movement disorders
Excludes2 sleep related movement disorders (G47.6-)
G25.0 Essential tremor
Familial tremor
Excludes1 tremor NOS (R25.1)
G25.1 Drug-induced tremor
UseAdditionalCode code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
G25.2 Other specified forms of tremor
Intention tremor
G25.3 Myoclonus
Drug-induced myoclonus
Palatal myoclonus
UseAdditionalCode code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
Excludes1 facial myokymia (G51.4)
myoclonic epilepsy (G40.-)
G25.4 Drug-induced chorea
UseAdditionalCode code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
G25.5 Other chorea
Chorea NOS
Excludes1 chorea NOS with heart involvement (I02.0)
Huntington's chorea (G10)
rheumatic chorea (I02.-)
Sydenham's chorea (I02.-)
G25.6 Drug induced tics and other tics of organic origin
G25.61 Drug induced tics
UseAdditionalCode code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
G25.69 Other tics of organic origin
Excludes1 habit spasm (F95.9)
tic NOS (F95.9)
Tourette's syndrome (F95.2)
G25.7 Other and unspecified drug induced movement disorders
UseAdditionalCode code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
G25.70 Drug induced movement disorder, unspecified
G25.71 Drug induced akathisia
Drug induced acathisia
Neuroleptic induced acute akathisia
Tardive akathisia
G25.79 Other drug induced movement disorders
G25.8 Other specified extrapyramidal and movement disorders
G25.81 Restless legs syndrome
G25.82 Stiff-man syndrome
G25.83 Benign shuddering attacks
G25.89 Other specified extrapyramidal and movement disorders
G25.9 Extrapyramidal and movement disorder, unspecified
G26 Extrapyramidal and movement disorders in diseases classified elsewhere
CodeFirst underlying disease
nonPrimary Yes