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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  • G40.841—

    KCNQ2-related epilepsy, not intractable, with status epilepticus

  • G40.842—

    KCNQ2-related epilepsy, not intractable, without status epilepticus

  • G40.843—

    KCNQ2-related epilepsy, intractable, with status epilepticus

  • G40.844—

    KCNQ2-related epilepsy, intractable, without status epilepticus

  • G40.89—

    Other seizures

  • G40.9—

    Epilepsy, unspecified

  • G40.90—

    Epilepsy, unspecified, not intractable

  • G40.901—

    Epilepsy, unspecified, not intractable, with status epilepticus

  • G40.909—

    Epilepsy, unspecified, not intractable, without status epilepticus

  • G40.91—

    Epilepsy, unspecified, intractable

  • G40.911—

    Epilepsy, unspecified, intractable, with status epilepticus

  • G40.919—

    Epilepsy, unspecified, intractable, without status epilepticus

  • G40.A—

    Absence epileptic syndrome

  • G40.A0—

    Absence epileptic syndrome, not intractable

  • G40.A01—

    Absence epileptic syndrome, not intractable, with status epilepticus

  • G40.A09—

    Absence epileptic syndrome, not intractable, without status epilepticus

  • G40.A1—

    Absence epileptic syndrome, intractable

  • G40.A11—

    Absence epileptic syndrome, intractable, with status epilepticus

  • G40.A19—

    Absence epileptic syndrome, intractable, without status epilepticus

  • G40.B—

    Juvenile myoclonic epilepsy [impulsive petit mal]

  • G40.B0—

    Juvenile myoclonic epilepsy, not intractable

  • G40.B01—

    Juvenile myoclonic epilepsy, not intractable, with status epilepticus

  • G40.B09—

    Juvenile myoclonic epilepsy, not intractable, without status epilepticus

  • G40.B1—

    Juvenile myoclonic epilepsy, intractable

  • G40.B11—

    Juvenile myoclonic epilepsy, intractable, with status epilepticus

  • G40.B19—

    Juvenile myoclonic epilepsy, intractable, without status epilepticus

  • G40.C—

    Lafora progressive myoclonus epilepsy

  • G40.C0—

    Lafora progressive myoclonus epilepsy, not intractable

  • G40.C01—

    Lafora progressive myoclonus epilepsy, not intractable, with status epilepticus

  • G40.C09—

    Lafora progressive myoclonus epilepsy, not intractable, without status epilepticus

  • G40.C1—

    Lafora progressive myoclonus epilepsy, intractable

  • G40.C11—

    Lafora progressive myoclonus epilepsy, intractable, with status epilepticus

  • G40.C19—

    Lafora progressive myoclonus epilepsy, intractable, without status epilepticus

  • G43—

    Migraine

  • G43.0—

    Migraine without aura

  • G43.00—

    Migraine without aura, not intractable

  • G43.001—

    Migraine without aura, not intractable, with status migrainosus

  • G43.009—

    Migraine without aura, not intractable, without status migrainosus

  • G43.01—

    Migraine without aura, intractable

  • G43.011—

    Migraine without aura, intractable, with status migrainosus

  • G43.019—

    Migraine without aura, intractable, without status migrainosus

  • G43.1—

    Migraine with aura

  • G43.10—

    Migraine with aura, not intractable

  • G43.101—

    Migraine with aura, not intractable, with status migrainosus

  • G43.109—

    Migraine with aura, not intractable, without status migrainosus

  • G43.11—

    Migraine with aura, intractable

  • G43.111—

    Migraine with aura, intractable, with status migrainosus

  • G43.119—

    Migraine with aura, intractable, without status migrainosus

  • G43.4—

    Hemiplegic migraine

  • G43.40—

    Hemiplegic migraine, not intractable

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