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
PrevNext
  • G43.B0—

    Ophthalmoplegic migraine, not intractable

  • G43.B1—

    Ophthalmoplegic migraine, intractable

  • G43.C—

    Periodic headache syndromes in child or adult

  • G43.C0—

    Periodic headache syndromes in child or adult, not intractable

  • G43.C1—

    Periodic headache syndromes in child or adult, intractable

  • G43.D—

    Abdominal migraine

  • G43.D0—

    Abdominal migraine, not intractable

  • G43.D1—

    Abdominal migraine, intractable

  • G43.E—

    Chronic migraine with aura

  • G43.E0—

    Chronic migraine with aura, not intractable

  • G43.E01—

    Chronic migraine with aura, not intractable, with status migrainosus

  • G43.E09—

    Chronic migraine with aura, not intractable, without status migrainosus

  • G43.E1—

    Chronic migraine with aura, intractable

  • G43.E11—

    Chronic migraine with aura, intractable, with status migrainosus

  • G43.E19—

    Chronic migraine with aura, intractable, without status migrainosus

  • G44—

    Other headache syndromes

  • G44.0—

    Cluster headaches and other trigeminal autonomic cephalgias (TAC)

  • G44.00—

    Cluster headache syndrome, unspecified

  • G44.001—

    Cluster headache syndrome, unspecified, intractable

  • G44.009—

    Cluster headache syndrome, unspecified, not intractable

  • G44.01—

    Episodic cluster headache

  • G44.011—

    Episodic cluster headache, intractable

  • G44.019—

    Episodic cluster headache, not intractable

  • G44.02—

    Chronic cluster headache

  • G44.021—

    Chronic cluster headache, intractable

  • G44.029—

    Chronic cluster headache, not intractable

  • G44.03—

    Episodic paroxysmal hemicrania

  • G44.031—

    Episodic paroxysmal hemicrania, intractable

  • G44.039—

    Episodic paroxysmal hemicrania, not intractable

  • G44.04—

    Chronic paroxysmal hemicrania

  • G44.041—

    Chronic paroxysmal hemicrania, intractable

  • G44.049—

    Chronic paroxysmal hemicrania, not intractable

  • G44.05—

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

  • 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

  • G44.09—

    Other trigeminal autonomic cephalgias (TAC)

  • G44.091—

    Other trigeminal autonomic cephalgias (TAC), intractable

  • G44.099—

    Other trigeminal autonomic cephalgias (TAC), not intractable

  • G44.1—

    Vascular headache, not elsewhere classified

  • G44.2—

    Tension-type headache

  • G44.20—

    Tension-type headache, unspecified

  • G44.201—

    Tension-type headache, unspecified, intractable

  • G44.209—

    Tension-type headache, unspecified, not intractable

  • G44.21—

    Episodic tension-type headache

  • G44.211—

    Episodic tension-type headache, intractable

  • G44.219—

    Episodic tension-type headache, not intractable

  • G44.22—

    Chronic tension-type headache

  • G44.221—

    Chronic tension-type headache, intractable

  • G44.229—

    Chronic tension-type headache, not intractable

  • G44.3—

    Post-traumatic headache

PreviousPage 8 of 19Next