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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  • G93.32—

    Myalgic encephalomyelitis/chronic fatigue syndrome

  • G93.39—

    Other post infection and related fatigue syndromes

  • G93.4—

    Other and unspecified encephalopathy

  • G93.40—

    Encephalopathy, unspecified

  • G93.41—

    Metabolic encephalopathy

  • G93.42—

    Megalencephalic leukoencephalopathy with subcortical cysts

  • G93.43—

    Leukoencephalopathy with calcifications and cysts

  • G93.44—

    Adult-onset leukodystrophy with axonal spheroids

  • G93.45—

    Developmental and epileptic encephalopathy

  • G93.49—

    Other encephalopathy

  • G93.5—

    Compression of brain

  • G93.6—

    Cerebral edema

  • G93.7—

    Reye's syndrome

  • G93.8—

    Other specified disorders of brain

  • G93.81—

    Temporal sclerosis

  • G93.82—

    Brain death

  • G93.89—

    Other specified disorders of brain

  • G93.9—

    Disorder of brain, unspecified

  • G94—

    Other disorders of brain in diseases classified elsewhere

  • G95—

    Other and unspecified diseases of spinal cord

  • G95.0—

    Syringomyelia and syringobulbia

  • G95.1—

    Vascular myelopathies

  • G95.11—

    Acute infarction of spinal cord (embolic) (nonembolic)

  • G95.19—

    Other vascular myelopathies

  • G95.2—

    Other and unspecified cord compression

  • G95.20—

    Unspecified cord compression

  • G95.29—

    Other cord compression

  • G95.8—

    Other specified diseases of spinal cord

  • G95.81—

    Conus medullaris syndrome

  • G95.89—

    Other specified diseases of spinal cord

  • G95.9—

    Disease of spinal cord, unspecified

  • G96—

    Other disorders of central nervous system

  • G96.0—

    Cerebrospinal fluid leak

  • G96.00—

    Cerebrospinal fluid leak, unspecified

  • G96.01—

    Cranial cerebrospinal fluid leak, spontaneous

  • G96.02—

    Spinal cerebrospinal fluid leak, spontaneous

  • G96.08—

    Other cranial cerebrospinal fluid leak

  • G96.09—

    Other spinal cerebrospinal fluid leak

  • G96.1—

    Disorders of meninges, not elsewhere classified

  • G96.11—

    Dural tear

  • G96.12—

    Meningeal adhesions (cerebral) (spinal)

  • G96.19—

    Other disorders of meninges, not elsewhere classified

  • G96.191—

    Perineural cyst

  • G96.198—

    Other disorders of meninges, not elsewhere classified

  • G96.8—

    Other specified disorders of central nervous system

  • G96.81—

    Intracranial hypotension

  • G96.810—

    Intracranial hypotension, unspecified

  • G96.811—

    Intracranial hypotension, spontaneous

  • G96.819—

    Other intracranial hypotension

  • G96.89—

    Other specified disorders of central nervous system

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