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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  • G40.109—

    Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, without status epilepticus

  • G40.11—

    Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable

  • G40.111—

    Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable, with status epilepticus

  • G40.119—

    Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable, without status epilepticus

  • G40.2—

    Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures

  • G40.20—

    Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable

  • G40.201—

    Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, with status epilepticus

  • G40.209—

    Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, without status epilepticus

  • G40.21—

    Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable

  • G40.211—

    Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable, with status epilepticus

  • G40.219—

    Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable, without status epilepticus

  • G40.3—

    Generalized idiopathic epilepsy and epileptic syndromes

  • G40.30—

    Generalized idiopathic epilepsy and epileptic syndromes, not intractable

  • G40.301—

    Generalized idiopathic epilepsy and epileptic syndromes, not intractable, with status epilepticus

  • G40.309—

    Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus

  • G40.31—

    Generalized idiopathic epilepsy and epileptic syndromes, intractable

  • G40.311—

    Generalized idiopathic epilepsy and epileptic syndromes, intractable, with status epilepticus

  • G40.319—

    Generalized idiopathic epilepsy and epileptic syndromes, intractable, without status epilepticus

  • G40.4—

    Other generalized epilepsy and epileptic syndromes

  • G40.40—

    Other generalized epilepsy and epileptic syndromes, not intractable

  • G40.401—

    Other generalized epilepsy and epileptic syndromes, not intractable, with status epilepticus

  • G40.409—

    Other generalized epilepsy and epileptic syndromes, not intractable, without status epilepticus

  • G40.41—

    Other generalized epilepsy and epileptic syndromes, intractable

  • G40.411—

    Other generalized epilepsy and epileptic syndromes, intractable, with status epilepticus

  • G40.419—

    Other generalized epilepsy and epileptic syndromes, intractable, without status epilepticus

  • G40.42—

    Cyclin-Dependent Kinase-Like 5 Deficiency Disorder

  • G40.5—

    Epileptic seizures related to external causes

  • G40.50—

    Epileptic seizures related to external causes, not intractable

  • G40.501—

    Epileptic seizures related to external causes, not intractable, with status epilepticus

  • G40.509—

    Epileptic seizures related to external causes, not intractable, without status epilepticus

  • G40.8—

    Other epilepsy and recurrent seizures

  • G40.80—

    Other epilepsy

  • G40.801—

    Other epilepsy, not intractable, with status epilepticus

  • G40.802—

    Other epilepsy, not intractable, without status epilepticus

  • G40.803—

    Other epilepsy, intractable, with status epilepticus

  • G40.804—

    Other epilepsy, intractable, without status epilepticus

  • G40.81—

    Lennox-Gastaut syndrome

  • G40.811—

    Lennox-Gastaut syndrome, not intractable, with status epilepticus

  • G40.812—

    Lennox-Gastaut syndrome, not intractable, without status epilepticus

  • G40.813—

    Lennox-Gastaut syndrome, intractable, with status epilepticus

  • G40.814—

    Lennox-Gastaut syndrome, intractable, without status epilepticus

  • G40.82—

    Epileptic spasms

  • G40.821—

    Epileptic spasms, not intractable, with status epilepticus

  • G40.822—

    Epileptic spasms, not intractable, without status epilepticus

  • G40.823—

    Epileptic spasms, intractable, with status epilepticus

  • G40.824—

    Epileptic spasms, intractable, without status epilepticus

  • G40.83—

    Dravet syndrome

  • G40.833—

    Dravet syndrome, intractable, with status epilepticus

  • G40.834—

    Dravet syndrome, intractable, without status epilepticus

  • G40.84—

    KCNQ2-related epilepsy

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