G40 Epilepsy and recurrent seizures
ICD-10-CM category G40 sits in Chapter 6 (Diseases of the nervous system, G00-G99). It contains 58 billable codes for FY2027, effective October 1, 2026 to September 30, 2027. Always code to the most specific code available: a code with more characters that describes the diagnosis more precisely takes priority over a shorter one.
Subcategories
G40.0 Local-rel (focal) idio epilepsy w seizures of loc onsetG40.00 Local-rel (focal) idio epi w seiz of loc onset, not ntrctG40.01 Local-rel (focal) idio epi w seizures of loc onset, ntrctG40.1 Local-rel (focal) symptc epilepsy w simple partial seizuresG40.10 Local-rel symptc epi w simple partial seiz, not ntrctG40.11 Local-rel (focal) symptc epi w simple partial seiz, ntrctG40.2 Local-rel (focal) symptc epilepsy w complex partial seizuresG40.20 Local-rel symptc epi w complex partial seiz, not ntrctG40.21 Local-rel (focal) symptc epi w complex partial seiz, ntrctG40.3 Generalized idiopathic epilepsy and epileptic syndromesG40.30 Generalized idiopathic epilepsy, not intractableG40.31 Generalized idiopathic epilepsy, intractableG40.4 Other generalized epilepsy and epileptic syndromesG40.40 Oth generalized epilepsy, not intractableG40.41 Oth generalized epilepsy, intractableG40.5 Epileptic seizures related to external causesG40.50 Epileptic seizures related to external causes, not ntrctG40.8 Other epilepsy and recurrent seizuresG40.80 Other epilepsyG40.81 Lennox-Gastaut syndromeG40.82 Epileptic spasmsG40.83 Dravet syndromeG40.84 KCNQ2-related epilepsyG40.9 Epilepsy, unspecifiedG40.90 Epilepsy, unspecified, not intractableG40.91 Epilepsy, unspecified, intractableG40.A Absence epileptic syndromeG40.A0 Absence epileptic syndrome, not intractableG40.A1 Absence epileptic syndrome, intractableG40.B Juvenile myoclonic epilepsy [impulsive petit mal]G40.B0 Juvenile myoclonic epilepsy, not intractableG40.B1 Juvenile myoclonic epilepsy, intractableG40.C Lafora progressive myoclonus epilepsyG40.C0 Lafora progressive myoclonus epilepsy, not intractableG40.C1 Lafora progressive myoclonus epilepsy, intractable
Billable codes in G40
| Code | Description |
|---|---|
G40.001 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, with status epilepticus |
G40.009 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, without status epilepticus |
G40.011 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, with status epilepticus |
G40.019 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, without status epilepticus |
G40.101 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, with status epilepticus |
G40.109 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, without status epilepticus |
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 |
G40.201 | 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 |
G40.211 | 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 |
G40.301 | Generalized idiopathic epilepsy and epileptic syndromes, not intractable, with status epilepticus |
G40.309 | Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus |
G40.311 | Generalized idiopathic epilepsy and epileptic syndromes, intractable, with status epilepticus |
G40.319 | Generalized idiopathic epilepsy and epileptic syndromes, intractable, without status epilepticus |
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 |
G40.411 | 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 |
G40.501 | Epileptic seizures related to external causes, not intractable, with status epilepticus |
G40.509 | Epileptic seizures related to external causes, not intractable, without status epilepticus |
G40.801 | 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 |
G40.811 | 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 |
G40.821 | 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 |
G40.833 | Dravet syndrome, intractable, with status epilepticus |
G40.834 | Dravet syndrome, intractable, without status epilepticus |
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 |
G40.901 | Epilepsy, unspecified, not intractable, with status epilepticus |
G40.909 | Epilepsy, unspecified, not intractable, without status epilepticus |
G40.911 | Epilepsy, unspecified, intractable, with status epilepticus |
G40.919 | Epilepsy, unspecified, intractable, without status epilepticus |
G40.A01 | Absence epileptic syndrome, not intractable, with status epilepticus |
G40.A09 | Absence epileptic syndrome, not intractable, without status epilepticus |
G40.A11 | Absence epileptic syndrome, intractable, with status epilepticus |
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 |
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