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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  • G43.C1|

    Periodic headache syndromes in child or adult, intractable

  • G43.D0|

    Abdominal migraine, not intractable

  • G43.D1|

    Abdominal migraine, intractable

  • G43.E01|

    Chronic migraine with aura, not intractable, with status migrainosus

  • G43.E09|

    Chronic migraine with aura, not intractable, without status migrainosus

  • G43.E11|

    Chronic migraine with aura, intractable, with status migrainosus

  • G43.E19|

    Chronic migraine with aura, intractable, without status migrainosus

  • G44.001|

    Cluster headache syndrome, unspecified, intractable

  • G44.009|

    Cluster headache syndrome, unspecified, not intractable

  • G44.011|

    Episodic cluster headache, intractable

  • G44.019|

    Episodic cluster headache, not intractable

  • G44.021|

    Chronic cluster headache, intractable

  • G44.029|

    Chronic cluster headache, not intractable

  • G44.031|

    Episodic paroxysmal hemicrania, intractable

  • G44.039|

    Episodic paroxysmal hemicrania, not intractable

  • G44.041|

    Chronic paroxysmal hemicrania, intractable

  • G44.049|

    Chronic paroxysmal hemicrania, not intractable

  • G44.051|

    Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), intractable

  • G44.059|

    Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), not intractable

  • G44.091|

    Other trigeminal autonomic cephalgias (TAC), intractable

  • G44.099|

    Other trigeminal autonomic cephalgias (TAC), not intractable

  • G44.1|

    Vascular headache, not elsewhere classified

  • G44.201|

    Tension-type headache, unspecified, intractable

  • G44.209|

    Tension-type headache, unspecified, not intractable

  • G44.211|

    Episodic tension-type headache, intractable

  • G44.219|

    Episodic tension-type headache, not intractable

  • G44.221|

    Chronic tension-type headache, intractable

  • G44.229|

    Chronic tension-type headache, not intractable

  • G44.301|

    Post-traumatic headache, unspecified, intractable

  • G44.309|

    Post-traumatic headache, unspecified, not intractable

  • G44.311|

    Acute post-traumatic headache, intractable

  • G44.319|

    Acute post-traumatic headache, not intractable

  • G44.321|

    Chronic post-traumatic headache, intractable

  • G44.329|

    Chronic post-traumatic headache, not intractable

  • G44.40|

    Drug-induced headache, not elsewhere classified, not intractable

  • G44.41|

    Drug-induced headache, not elsewhere classified, intractable

  • G44.51|

    Hemicrania continua

  • G44.52|

    New daily persistent headache (NDPH)

  • G44.53|

    Primary thunderclap headache

  • G44.59|

    Other complicated headache syndrome

  • 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

  • G45.0|

    Vertebro-basilar artery syndrome

  • G45.1|

    Carotid artery syndrome (hemispheric)

  • G45.2|

    Multiple and bilateral precerebral artery syndromes

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