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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