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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  • G57.81—

    Other specified mononeuropathies of right lower limb

  • G57.82—

    Other specified mononeuropathies of left lower limb

  • G57.83—

    Other specified mononeuropathies of bilateral lower limbs

  • G57.90—

    Unspecified mononeuropathy of unspecified lower limb

  • G57.91—

    Unspecified mononeuropathy of right lower limb

  • G57.92—

    Unspecified mononeuropathy of left lower limb

  • G57.93—

    Unspecified mononeuropathy of bilateral lower limbs

  • G58.0—

    Intercostal neuropathy

  • G58.7—

    Mononeuritis multiplex

  • G58.8—

    Other specified mononeuropathies

  • G58.9—

    Mononeuropathy, unspecified

  • G59—

    Mononeuropathy in diseases classified elsewhere

  • G60.0—

    Hereditary motor and sensory neuropathy

  • G60.1—

    Refsum's disease

  • G60.2—

    Neuropathy in association with hereditary ataxia

  • G60.3—

    Idiopathic progressive neuropathy

  • G60.8—

    Other hereditary and idiopathic neuropathies

  • G60.9—

    Hereditary and idiopathic neuropathy, unspecified

  • G61.0—

    Guillain-Barre syndrome

  • G61.1—

    Serum neuropathy

  • G61.81—

    Chronic inflammatory demyelinating polyneuritis

  • G61.82—

    Multifocal motor neuropathy

  • G61.89—

    Other inflammatory polyneuropathies

  • G61.9—

    Inflammatory polyneuropathy, unspecified

  • G62.0—

    Drug-induced polyneuropathy

  • G62.1—

    Alcoholic polyneuropathy

  • G62.2—

    Polyneuropathy due to other toxic agents

  • G62.81—

    Critical illness polyneuropathy

  • G62.82—

    Radiation-induced polyneuropathy

  • G62.89—

    Other specified polyneuropathies

  • G62.9—

    Polyneuropathy, unspecified

  • G63—

    Polyneuropathy in diseases classified elsewhere

  • G64—

    Other disorders of peripheral nervous system

  • G65.0—

    Sequelae of Guillain-Barré syndrome

  • G65.1—

    Sequelae of other inflammatory polyneuropathy

  • G65.2—

    Sequelae of toxic polyneuropathy

  • G70.00—

    Myasthenia gravis without (acute) exacerbation

  • G70.01—

    Myasthenia gravis with (acute) exacerbation

  • G70.1—

    Toxic myoneural disorders

  • G70.2—

    Congenital and developmental myasthenia

  • G70.80—

    Lambert-Eaton syndrome, unspecified

  • G70.81—

    Lambert-Eaton syndrome in disease classified elsewhere

  • G70.89—

    Other specified myoneural disorders

  • G70.9—

    Myoneural disorder, unspecified

  • G71.00—

    Muscular dystrophy, unspecified

  • G71.01—

    Duchenne or Becker muscular dystrophy

  • G71.02—

    Facioscapulohumeral muscular dystrophy

  • G71.031—

    Autosomal dominant limb girdle muscular dystrophy

  • G71.032—

    Autosomal recessive limb girdle muscular dystrophy due to calpain-3 dysfunction

  • G71.033—

    Limb girdle muscular dystrophy due to dysferlin dysfunction

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