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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  • G44.30—

    Post-traumatic headache, unspecified

  • G44.301—

    Post-traumatic headache, unspecified, intractable

  • G44.309—

    Post-traumatic headache, unspecified, not intractable

  • G44.31—

    Acute post-traumatic headache

  • G44.311—

    Acute post-traumatic headache, intractable

  • G44.319—

    Acute post-traumatic headache, not intractable

  • G44.32—

    Chronic post-traumatic headache

  • G44.321—

    Chronic post-traumatic headache, intractable

  • G44.329—

    Chronic post-traumatic headache, not intractable

  • G44.4—

    Drug-induced headache, not elsewhere classified

  • G44.40—

    Drug-induced headache, not elsewhere classified, not intractable

  • G44.41—

    Drug-induced headache, not elsewhere classified, intractable

  • G44.5—

    Complicated headache syndromes

  • G44.51—

    Hemicrania continua

  • G44.52—

    New daily persistent headache (NDPH)

  • G44.53—

    Primary thunderclap headache

  • G44.59—

    Other complicated headache syndrome

  • G44.8—

    Other specified headache syndromes

  • G44.81—

    Hypnic headache

  • G44.82—

    Headache associated with sexual activity

  • G44.83—

    Primary cough headache

  • G44.84—

    Primary exertional headache

  • G44.85—

    Primary stabbing headache

  • G44.86—

    Cervicogenic headache

  • G44.89—

    Other headache syndrome

  • G45—

    Transient cerebral ischemic attacks and related syndromes

  • G45.0—

    Vertebro-basilar artery syndrome

  • G45.1—

    Carotid artery syndrome (hemispheric)

  • G45.2—

    Multiple and bilateral precerebral artery syndromes

  • G45.3—

    Amaurosis fugax

  • G45.4—

    Transient global amnesia

  • G45.8—

    Other transient cerebral ischemic attacks and related syndromes

  • G45.9—

    Transient cerebral ischemic attack, unspecified

  • G46—

    Vascular syndromes of brain in cerebrovascular diseases

  • G46.0—

    Middle cerebral artery syndrome

  • G46.1—

    Anterior cerebral artery syndrome

  • G46.2—

    Posterior cerebral artery syndrome

  • G46.3—

    Brain stem stroke syndrome

  • G46.4—

    Cerebellar stroke syndrome

  • G46.5—

    Pure motor lacunar syndrome

  • G46.6—

    Pure sensory lacunar syndrome

  • G46.7—

    Other lacunar syndromes

  • G46.8—

    Other vascular syndromes of brain in cerebrovascular diseases

  • G47—

    Sleep disorders

  • G47.0—

    Insomnia

  • G47.00—

    Insomnia, unspecified

  • G47.01—

    Insomnia due to medical condition

  • G47.09—

    Other insomnia

  • G47.1—

    Hypersomnia

  • G47.10—

    Hypersomnia, unspecified

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