ICD-10 Chapter VI: Diseases of the nervous system

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G00-G99 - Diseases of the nervous system

(G00-G09) Inflammatory diseases of the central nervous system

(G00) Bacterial meningitis, not elsewhere classified
- (G00.0) Haemophilus meningitis
- (G00.1) Pneumococcal meningitis
- (G00.2) Streptococcal meningitis
- (G00.3) Staphylococcal meningitis
- (G00.8) Other bacterial meningitis
  - Meningitis due to Escherichia coli
  - Meningitis due to Friedländer bacillus
  - Meningitis due to Klebsiella
- (G00.9) Bacterial meningitis, unspecified

(G01) Meningitis in bacterial diseases classified elsewhere
(G02) Meningitis in other infectious and parasitic diseases classified elsewhere

(G03) Meningitis due to other and unspecified causes
- (G03.0) Nonpyogenic meningitis
- (G03.1) Chronic meningitis
- (G03.2) Benign recurrent meningitis (Mollaret)
- (G03.8) Meningitis due to other specified causes
- (G03.9) Meningitis, unspecified
  - Arachnoiditis (spinal) NOS

(G04) Encephalitis, myelitis and encephalomyelitis
- (G04.0) Acute disseminated encephalitis
- (G04.1) Tropical spastic paraplegia
- (G04.2) Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified
- (G04.8) Other encephalitis, myelitis and encephalomyelitis
- (G04.9) Encephalitis, myelitis and encephalomyelitis, unspecified

(G05) Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere
(G06) Intracranial and intraspinal abscess and granuloma
(G07) Intracranial and intraspinal abscess and granuloma in diseases classified elsewhere
(G08) Intracranial and intraspinal phlebitis and thrombophlebitis
(G09) Sequelae of inflammatory diseases of central nervous system

(G10-G13) Systemic atrophies primarily affecting the central nervous system

(G10) Huntington's disease

(G11) Hereditary ataxia
- (G11.0) Congenital nonprogressive ataxia
- (G11.1) Early-onset cerebellar ataxia
- (G11.2) Late-onset cerebellar ataxia
- (G11.3) Cerebellar ataxia with defective DNA repair
  - Ataxia telangiectasia (Louis-Bar)
- (G11.4) Hereditary spastic paraplegia
- (G11.8) Other hereditary ataxias
- (G11.9) Hereditary ataxia, unspecified

(G12) Spinal muscular atrophy and related syndromes
- (G12.0) Werdnig-Hoffman disease (Type 1)
- (G12.1) Other inherited spinal muscular atrophy
  - Progressive bulbar palsy of childhood (Fazio-Londe)
  - Kugelberg-Welander disease (Type 3)
- (G12.2) Motor neuron disease

(G13) Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere
- (G13.0) Paraneoplastic neuromyopathy and neuropathy
- (G13.1) Other systemic atrophy primarily affecting central nervous system in neoplastic disease
  - Paraneoplastic limbic encephalopathy
- (G13.2) Systemic atrophy primarily affecting central nervous system in myxoedema
- (G13.8) Systemic atrophy primarily affecting central nervous system in other diseases classified elsewhere

(G20-G26) Extrapyramidal and movement disorders

(G20) Parkinson's disease

(G21) Secondary parkinsonism
- (G21.0) Malignant neuroleptic syndrome
- (G21.3) Postencephalitic parkinsonism

(G22) Parkinsonism in diseases classified elsewhere

(G23) Other degenerative diseases of basal ganglia
- (G23.0) Hallervorden-Spatz disease
- (G23.1) Progressive supranuclear ophthalmoplegia (Steele-Richardson-Olszewski)
- (G23.2) Striatonigral degeneration
- (G23.8) Other specified degenerative diseases of basal ganglia
- (G23.9) Degenerative disease of basal ganglia, unspecified

(G24) Dystonia
- (G24.0) Drug-induced dystonia
- (G24.1) Idiopathic familial dystonia
- (G24.2) Idiopathic nonfamilial dystonia
- (G24.3) Spasmodic torticollis
- (G24.4) Idiopathic orofacial dystonia
  - Orofacial dyskinesia
- (G24.5) Blepharospasm
- (G24.8) Other dystonia
- (G24.9) Dystonia, unspecified
  - Dyskinesia NOS

(G25) Other extrapyramidal and movement disorders
- (G25.0) Essential tremor
- (G25.1) Drug-induced tremor
- (G25.2) Other specified forms of tremor
- (G25.3) Myoclonus
- (G25.4) Drug-induced chorea
- (G25.5) Other chorea
- (G25.6) Drug-induced tics and other tics of organic origin
- (G25.8) Other specified extrapyramidal and movement disorders
  - Restless legs syndrome
  - Stiff-man syndrome
- (G25.9) Extrapyramidal and movement disorder, unspecified

(G26) Extrapyramidal and movement disorders in diseases classified elsewhere

(G30-G32) Other degenerative diseases of the nervous system

(G30) Alzheimer's disease

(G31) Other degenerative diseases of nervous system, not elsewhere classified
- (G31.0) Circumscribed brain atrophy
  - Pick's disease
- (G31.1) Senile degeneration of brain, not elsewhere classified
- (G31.2) Degeneration of nervous system due to alcohol
- (G31.8) Other specified degenerative diseases of nervous system
  - Grey-matter degeneration (Alpers)
  - Lewy body dementia
  - Subacute necrotizing encephalopathy (Leigh)
- (G31.9) Degenerative disease of nervous system, unspecified

(G32) Other degenerative disorders of nervous system in diseases classified elsewhere
- (G32.0) Subacute combined degeneration of spinal cord in diseases classified elsewhere
- (G32.8) Other specified degenerative disorders of nervous system in diseases classified elsewhere

(G35-G37) Demyelinating diseases of the central nervous system

(G35) Multiple sclerosis

(G36) Other acute disseminated demyelination
- (G36.0) Neuromyelitis optica (Devic)
- (G36.1) Acute and subacute haemorrhagic leukoencephalitis (Hurst)
- (G36.8) Other specified acute disseminated demyelination
- (G36.9) Acute disseminated demyelination, unspecified

(G37) Other demyelinating diseases of central nervous system
- (G37.0) Diffuse sclerosis
- (G37.1) Central demyelination of corpus callosum
- (G37.2) Central pontine myelinolysis
- (G37.3) Acute transverse myelitis in demyelinating disease of central nervous system
- (G37.4) Subacute necrotizing myelitis
- (G37.5) Concentric sclerosis (Baló)
- (G37.8) Other specified demyelinating diseases of central nervous system
- (G37.9) Demyelinating disease of central nervous system, unspecified

(G40-G47) Episodic and paroxysmal disorders

(G40) Epilepsy
- (G40.0) Localization-related (focal)(partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset
- (G40.1) Localization-related (focal)(partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures
- (G40.2) Localization-related (focal)(partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures
- (G40.3) Generalized idiopathic epilepsy and epileptic syndromes
  - Benign:
    - myoclonic epilepsy in infancy
    - neonatal convulsions (familial)
  - Childhood absence epilepsy (pyknolepsy)
  - Epilepsy with grand mal seizures on awakening
  - Juvenile:
    - absence epilepsy
    - myoclonic epilepsy (impulsive petit mal)
  - Nonspecific epileptic seizures:
    - atonic
    - clonic
    - myoclonic
    - tonic
    - tonic-clonic
- (G40.4) Other generalized epilepsy and epileptic syndromes
- (G40.5) Special epileptic syndromes
  - Epilepsia partialis continua (Kozhevnikof)
- (G40.6) Grand mal seizures, unspecified (with or without petit mal)
- (G40.7) Petit mal, unspecified, without grand mal seizures
- (G40.8) Other epilepsy
  - Epilepsies and epileptic syndromes undetermined as to whether they are focal or generalized
- (G40.9) Epilepsy, unspecified