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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  • G25.70—

    Drug induced movement disorder, unspecified

  • G25.71—

    Drug induced akathisia

  • G25.79—

    Other drug induced 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

  • G30.0—

    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

  • G31.01—

    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

  • G31.80—

    Leukodystrophy, unspecified

  • G31.81—

    Alpers disease

  • G31.82—

    Leigh's disease

  • G31.83—

    Neurocognitive disorder with Lewy bodies

  • G31.84—

    Mild cognitive impairment of uncertain or unknown etiology

  • G31.85—

    Corticobasal degeneration

  • G31.86—

    Alexander disease

  • G31.87—

    Primary progressive apraxia of speech

  • G31.89—

    Other specified degenerative diseases of nervous system

  • G31.9—

    Degenerative disease of nervous system, unspecified

  • G32.0—

    Subacute combined degeneration of spinal cord in diseases classified elsewhere

  • G32.81—

    Cerebellar ataxia in diseases classified elsewhere

  • G32.89—

    Other specified degenerative disorders of nervous system in diseases classified elsewhere

  • G35.A—

    Relapsing-remitting multiple sclerosis

  • G35.B0—

    Primary progressive multiple sclerosis, unspecified

  • G35.B1—

    Active primary progressive multiple sclerosis

  • G35.B2—

    Non-active primary progressive multiple sclerosis

  • G35.C0—

    Secondary progressive multiple sclerosis, unspecified

  • G35.C1—

    Active secondary progressive multiple sclerosis

  • G35.C2—

    Non-active secondary progressive multiple sclerosis

  • G35.D—

    Multiple sclerosis, unspecified

  • G36.0—

    Neuromyelitis optica [Devic]

  • G36.1—

    Acute and subacute hemorrhagic leukoencephalitis [Hurst]

  • G36.8—

    Other specified acute disseminated demyelination

  • G36.9—

    Acute disseminated demyelination, unspecified

  • G37.0—

    Diffuse sclerosis of central nervous system

  • 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 of central nervous system

  • G37.5—

    Concentric sclerosis [Balo] of central nervous system

  • G37.81—

    Myelin oligodendrocyte glycoprotein antibody disease

  • G37.89—

    Other specified demyelinating diseases of central nervous system

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