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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  • G71.3—

    Mitochondrial myopathy, not elsewhere classified

  • G71.8—

    Other primary disorders of muscles

  • G71.9—

    Primary disorder of muscle, unspecified

  • G72—

    Other and unspecified myopathies

  • G72.0—

    Drug-induced myopathy

  • G72.1—

    Alcoholic myopathy

  • G72.2—

    Myopathy due to other toxic agents

  • G72.3—

    Periodic paralysis

  • G72.4—

    Inflammatory and immune myopathies, not elsewhere classified

  • G72.41—

    Inclusion body myositis [IBM]

  • G72.49—

    Other inflammatory and immune myopathies, not elsewhere classified

  • G72.8—

    Other specified myopathies

  • G72.81—

    Critical illness myopathy

  • G72.89—

    Other specified myopathies

  • G72.9—

    Myopathy, unspecified

  • G73—

    Disorders of myoneural junction and muscle in diseases classified elsewhere

  • G73.1—

    Lambert-Eaton syndrome in neoplastic disease

  • G73.3—

    Myasthenic syndromes in other diseases classified elsewhere

  • G73.7—

    Myopathy in diseases classified elsewhere

  • G80—

    Cerebral palsy

  • G80.0—

    Spastic quadriplegic cerebral palsy

  • G80.1—

    Spastic diplegic cerebral palsy

  • G80.2—

    Spastic hemiplegic cerebral palsy

  • G80.3—

    Athetoid cerebral palsy

  • G80.4—

    Ataxic cerebral palsy

  • G80.8—

    Other cerebral palsy

  • G80.9—

    Cerebral palsy, unspecified

  • G81—

    Hemiplegia and hemiparesis

  • G81.0—

    Flaccid hemiplegia

  • G81.00—

    Flaccid hemiplegia affecting unspecified side

  • G81.01—

    Flaccid hemiplegia affecting right dominant side

  • G81.02—

    Flaccid hemiplegia affecting left dominant side

  • G81.03—

    Flaccid hemiplegia affecting right nondominant side

  • G81.04—

    Flaccid hemiplegia affecting left nondominant side

  • G81.1—

    Spastic hemiplegia

  • G81.10—

    Spastic hemiplegia affecting unspecified side

  • G81.11—

    Spastic hemiplegia affecting right dominant side

  • G81.12—

    Spastic hemiplegia affecting left dominant side

  • G81.13—

    Spastic hemiplegia affecting right nondominant side

  • G81.14—

    Spastic hemiplegia affecting left nondominant side

  • G81.9—

    Hemiplegia, unspecified

  • G81.90—

    Hemiplegia, unspecified affecting unspecified side

  • G81.91—

    Hemiplegia, unspecified affecting right dominant side

  • G81.92—

    Hemiplegia, unspecified affecting left dominant side

  • G81.93—

    Hemiplegia, unspecified affecting right nondominant side

  • G81.94—

    Hemiplegia, unspecified affecting left nondominant side

  • G82—

    Paraplegia (paraparesis) and quadriplegia (quadriparesis)

  • G82.2—

    Paraplegia

  • G82.20—

    Paraplegia, unspecified

  • G82.21—

    Paraplegia, complete

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