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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