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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  • G40.A19|

    Absence epileptic syndrome, intractable, without status epilepticus

  • G40.B01|

    Juvenile myoclonic epilepsy, not intractable, with status epilepticus

  • G40.B09|

    Juvenile myoclonic epilepsy, not intractable, without status epilepticus

  • G40.B11|

    Juvenile myoclonic epilepsy, intractable, with status epilepticus

  • G40.B19|

    Juvenile myoclonic epilepsy, intractable, without status epilepticus

  • G40.C01|

    Lafora progressive myoclonus epilepsy, not intractable, with status epilepticus

  • G40.C09|

    Lafora progressive myoclonus epilepsy, not intractable, without status epilepticus

  • G40.C11|

    Lafora progressive myoclonus epilepsy, intractable, with status epilepticus

  • G40.C19|

    Lafora progressive myoclonus epilepsy, intractable, without status epilepticus

  • G43.001|

    Migraine without aura, not intractable, with status migrainosus

  • G43.009|

    Migraine without aura, not intractable, without status migrainosus

  • G43.011|

    Migraine without aura, intractable, with status migrainosus

  • G43.019|

    Migraine without aura, intractable, without status migrainosus

  • G43.101|

    Migraine with aura, not intractable, with status migrainosus

  • G43.109|

    Migraine with aura, not intractable, without status migrainosus

  • G43.111|

    Migraine with aura, intractable, with status migrainosus

  • G43.119|

    Migraine with aura, intractable, without status migrainosus

  • G43.401|

    Hemiplegic migraine, not intractable, with status migrainosus

  • G43.409|

    Hemiplegic migraine, not intractable, without status migrainosus

  • G43.411|

    Hemiplegic migraine, intractable, with status migrainosus

  • G43.419|

    Hemiplegic migraine, intractable, without status migrainosus

  • G43.501|

    Persistent migraine aura without cerebral infarction, not intractable, with status migrainosus

  • G43.509|

    Persistent migraine aura without cerebral infarction, not intractable, without status migrainosus

  • G43.511|

    Persistent migraine aura without cerebral infarction, intractable, with status migrainosus

  • G43.519|

    Persistent migraine aura without cerebral infarction, intractable, without status migrainosus

  • G43.601|

    Persistent migraine aura with cerebral infarction, not intractable, with status migrainosus

  • G43.609|

    Persistent migraine aura with cerebral infarction, not intractable, without status migrainosus

  • G43.611|

    Persistent migraine aura with cerebral infarction, intractable, with status migrainosus

  • G43.619|

    Persistent migraine aura with cerebral infarction, intractable, without status migrainosus

  • G43.701|

    Chronic migraine without aura, not intractable, with status migrainosus

  • G43.709|

    Chronic migraine without aura, not intractable, without status migrainosus

  • G43.711|

    Chronic migraine without aura, intractable, with status migrainosus

  • G43.719|

    Chronic migraine without aura, intractable, without status migrainosus

  • G43.801|

    Other migraine, not intractable, with status migrainosus

  • G43.809|

    Other migraine, not intractable, without status migrainosus

  • G43.811|

    Other migraine, intractable, with status migrainosus

  • G43.819|

    Other migraine, intractable, without status migrainosus

  • G43.821|

    Menstrual migraine, not intractable, with status migrainosus

  • G43.829|

    Menstrual migraine, not intractable, without status migrainosus

  • G43.831|

    Menstrual migraine, intractable, with status migrainosus

  • G43.839|

    Menstrual migraine, intractable, without status migrainosus

  • G43.901|

    Migraine, unspecified, not intractable, with status migrainosus

  • G43.909|

    Migraine, unspecified, not intractable, without status migrainosus

  • G43.911|

    Migraine, unspecified, intractable, with status migrainosus

  • G43.919|

    Migraine, unspecified, intractable, without status migrainosus

  • G43.A0|

    Cyclical vomiting, in migraine, not intractable

  • G43.A1|

    Cyclical vomiting, in migraine, intractable

  • G43.B0|

    Ophthalmoplegic migraine, not intractable

  • G43.B1|

    Ophthalmoplegic migraine, intractable

  • G43.C0|

    Periodic headache syndromes in child or adult, not intractable

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