All ICD10 Codes
Chapter 6

G00–G99: Diseases of the Nervous System

Diseases of the Nervous System diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
All CodesBillable Only
Internal Codes
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  • G23.8—

    Other specified degenerative diseases of basal ganglia

  • G23.9—

    Degenerative disease of basal ganglia, unspecified

  • G24—

    Dystonia

  • G24.0—

    Drug induced dystonia

  • G24.01—

    Drug induced subacute dyskinesia

  • G24.02—

    Drug induced acute dystonia

  • G24.09—

    Other drug induced dystonia

  • G24.1—

    Genetic torsion dystonia

  • G24.2—

    Idiopathic nonfamilial dystonia

  • G24.3—

    Spasmodic torticollis

  • G24.4—

    Idiopathic orofacial dystonia

  • G24.5—

    Blepharospasm

  • G24.8—

    Other dystonia

  • G24.9—

    Dystonia, unspecified

  • 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

  • G25.61—

    Drug induced tics

  • G25.69—

    Other tics of organic origin

  • G25.7—

    Other and unspecified drug induced movement disorders

  • G25.70—

    Drug induced movement disorder, unspecified

  • G25.71—

    Drug induced 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

  • G30—

    Alzheimer's disease

  • G30.0—

    Alzheimer's disease with early onset

  • G30.1—

    Alzheimer's disease with late onset

  • G30.8—

    Other Alzheimer's disease

  • G30.9—

    Alzheimer's disease, unspecified

  • G31—

    Other degenerative diseases of nervous system, not elsewhere classified

  • G31.0—

    Frontotemporal dementia

  • G31.01—

    Pick's disease

  • G31.09—

    Other frontotemporal neurocognitive disorder

  • 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

  • G31.80—

    Leukodystrophy, unspecified

  • G31.81—

    Alpers disease

  • G31.82—

    Leigh's disease

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