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)
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Internal Codes
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  • G00|

    Bacterial meningitis, not elsewhere classified

  • G00.0|

    Hemophilus meningitis

  • G00.1|

    Pneumococcal meningitis

  • G00.2|

    Streptococcal meningitis

  • G00.3|

    Staphylococcal meningitis

  • G00.8|

    Other bacterial meningitis

  • G00.9|

    Bacterial meningitis, unspecified

  • G01|

    Meningitis in bacterial diseases classified elsewhere

  • G02|

    Meningitis in other infectious and parasitic diseases classified elsewhere

  • G03|

    Meningitis due to other and unspecified causes

  • G03.0|

    Nonpyogenic meningitis

  • G03.1|

    Chronic meningitis

  • G03.2|

    Benign recurrent meningitis [Mollaret]

  • G03.8|

    Meningitis due to other specified causes

  • G03.9|

    Meningitis, unspecified

  • G04|

    Encephalitis, myelitis and encephalomyelitis

  • G04.0|

    Acute disseminated encephalitis and encephalomyelitis (ADEM)

  • G04.00|

    Acute disseminated encephalitis and encephalomyelitis, unspecified

  • G04.01|

    Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)

  • G04.02|

    Postimmunization acute disseminated encephalitis, myelitis and encephalomyelitis

  • G04.1|

    Tropical spastic paraplegia

  • G04.2|

    Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified

  • G04.3|

    Acute necrotizing hemorrhagic encephalopathy

  • G04.30|

    Acute necrotizing hemorrhagic encephalopathy, unspecified

  • G04.31|

    Postinfectious acute necrotizing hemorrhagic encephalopathy

  • G04.32|

    Postimmunization acute necrotizing hemorrhagic encephalopathy

  • G04.39|

    Other acute necrotizing hemorrhagic encephalopathy

  • G04.8|

    Other encephalitis, myelitis and encephalomyelitis

  • G04.81|

    Other encephalitis and encephalomyelitis

  • G04.82|

    Acute flaccid myelitis

  • G04.89|

    Other myelitis

  • G04.9|

    Encephalitis, myelitis and encephalomyelitis, unspecified

  • G04.90|

    Encephalitis and encephalomyelitis, unspecified

  • G04.91|

    Myelitis, unspecified

  • G05|

    Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere

  • G05.3|

    Encephalitis and encephalomyelitis in diseases classified elsewhere

  • G05.4|

    Myelitis in diseases classified elsewhere

  • G06|

    Intracranial and intraspinal abscess and granuloma

  • G06.0|

    Intracranial abscess and granuloma

  • G06.1|

    Intraspinal abscess and granuloma

  • G06.2|

    Extradural and subdural abscess, unspecified

  • G07|

    Intracranial and intraspinal abscess and granuloma in diseases classified elsewhere

  • G08|

    Intracranial and intraspinal phlebitis and thrombophlebitis

  • G09|

    Sequelae of inflammatory diseases of central nervous system

  • G10|

    Huntington's disease

  • G11|

    Hereditary ataxia

  • G11.0|

    Congenital nonprogressive ataxia

  • G11.1|

    Early-onset cerebellar ataxia

  • G11.10|

    Early-onset cerebellar ataxia, unspecified

  • G11.11|

    Friedreich ataxia

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