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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  • G62.9—

    Polyneuropathy, unspecified

  • G63—

    Polyneuropathy in diseases classified elsewhere

  • G64—

    Other disorders of peripheral nervous system

  • G65—

    Sequelae of inflammatory and toxic polyneuropathies

  • G65.0—

    Sequelae of Guillain-Barré syndrome

  • G65.1—

    Sequelae of other inflammatory polyneuropathy

  • G65.2—

    Sequelae of toxic polyneuropathy

  • G70—

    Myasthenia gravis and other myoneural disorders

  • G70.0—

    Myasthenia gravis

  • 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

  • G70.8—

    Other specified myoneural disorders

  • 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—

    Primary disorders of muscles

  • G71.0—

    Muscular dystrophy

  • G71.00—

    Muscular dystrophy, unspecified

  • G71.01—

    Duchenne or Becker muscular dystrophy

  • G71.02—

    Facioscapulohumeral muscular dystrophy

  • G71.03—

    Limb girdle muscular dystrophies

  • 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

  • G71.034—

    Limb girdle muscular dystrophy due to sarcoglycan dysfunction

  • G71.0340—

    Limb girdle muscular dystrophy due to sarcoglycan dysfunction, unspecified

  • G71.0341—

    Limb girdle muscular dystrophy due to alpha sarcoglycan dysfunction

  • G71.0342—

    Limb girdle muscular dystrophy due to beta sarcoglycan dysfunction

  • G71.0349—

    Limb girdle muscular dystrophy due to other sarcoglycan dysfunction

  • G71.035—

    Limb girdle muscular dystrophy due to anoctamin-5 dysfunction

  • G71.036—

    Limb girdle muscular dystrophy due to fukutin related protein dysfunction

  • G71.038—

    Other limb girdle muscular dystrophy

  • G71.039—

    Limb girdle muscular dystrophy, unspecified

  • G71.09—

    Other specified muscular dystrophies

  • G71.1—

    Myotonic disorders

  • G71.11—

    Myotonic muscular dystrophy

  • G71.12—

    Myotonia congenita

  • G71.13—

    Myotonic chondrodystrophy

  • G71.14—

    Drug induced myotonia

  • G71.19—

    Other specified myotonic disorders

  • G71.2—

    Congenital myopathies

  • G71.20—

    Congenital myopathy, unspecified

  • G71.21—

    Nemaline myopathy

  • G71.22—

    Centronuclear myopathy

  • G71.220—

    X-linked myotubular myopathy

  • G71.228—

    Other centronuclear myopathy

  • G71.29—

    Other congenital myopathy

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