ICD-10-CM category
G40: Epilepsy and recurrent seizures
Codes under G40 (Epilepsy and recurrent seizures). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| G40.0 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset | — |
| G40.0 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset | — |
| G40.00 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable | — |
| G40.00 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable | — |
| G40.001 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, with status epilepticus | ✓ |
| G40.001 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, with status epilepticus | ✓ |
| G40.01 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable | — |
| G40.01 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable | — |
| G40.1 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures | — |
| G40.1 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures | — |
| G40.2 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures | — |
| G40.2 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures | — |
| G40.3 | Generalized idiopathic epilepsy and epileptic syndromes | — |
| G40.3 | Generalized idiopathic epilepsy and epileptic syndromes | — |
| G40.4 | Other generalized epilepsy and epileptic syndromes | — |
| G40.4 | Other generalized epilepsy and epileptic syndromes | — |
| G40.5 | Epileptic seizures related to external causes | — |
| G40.5 | Epileptic seizures related to external causes | — |
| G40.8 | Other epilepsy and recurrent seizures | — |
| G40.8 | Other epilepsy and recurrent seizures | — |
| G40.009 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, without status epilepticus | ✓ |
| G40.009 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, without status epilepticus | ✓ |
| G40.9 | Epilepsy, unspecified | — |
| G40.9 | Epilepsy, unspecified | — |
| G40.10 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable | — |
| G40.10 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable | — |
| G40.011 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, with status epilepticus | ✓ |
| G40.011 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, with status epilepticus | ✓ |
| G40.11 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable | — |
| G40.11 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable | — |
| G40.019 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, without status epilepticus | ✓ |
| G40.019 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, without status epilepticus | ✓ |
| G40.20 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable | — |
| G40.20 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable | — |
| G40.21 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable | — |
| G40.21 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable | — |
| G40.30 | Generalized idiopathic epilepsy and epileptic syndromes, not intractable | — |
| G40.30 | Generalized idiopathic epilepsy and epileptic syndromes, not intractable | — |
| G40.31 | Generalized idiopathic epilepsy and epileptic syndromes, intractable | — |
| G40.31 | Generalized idiopathic epilepsy and epileptic syndromes, intractable | — |
| G40.40 | Other generalized epilepsy and epileptic syndromes, not intractable | — |
| G40.40 | Other generalized epilepsy and epileptic syndromes, not intractable | — |
| G40.41 | Other generalized epilepsy and epileptic syndromes, intractable | — |
| G40.41 | Other generalized epilepsy and epileptic syndromes, intractable | — |
| G40.42 | Cyclin-Dependent Kinase-Like 5 Deficiency Disorder | ✓ |
| G40.42 | Cyclin-Dependent Kinase-Like 5 Deficiency Disorder | ✓ |
| G40.50 | Epileptic seizures related to external causes, not intractable | — |
| G40.50 | Epileptic seizures related to external causes, not intractable | — |
| G40.80 | Other epilepsy | — |
| G40.80 | Other epilepsy | — |
| G40.81 | Lennox-Gastaut syndrome | — |
| G40.81 | Lennox-Gastaut syndrome | — |
| G40.82 | Epileptic spasms | — |
| G40.82 | Epileptic spasms | — |
| G40.83 | Dravet syndrome | — |
| G40.83 | Dravet syndrome | — |
| G40.84 | KCNQ2-related epilepsy | — |
| G40.84 | KCNQ2-related epilepsy | — |
| G40.89 | Other seizures | ✓ |
| G40.89 | Other seizures | ✓ |
| G40.90 | Epilepsy, unspecified, not intractable | — |
| G40.90 | Epilepsy, unspecified, not intractable | — |
| G40.91 | Epilepsy, unspecified, intractable | — |
| G40.91 | Epilepsy, unspecified, intractable | — |
| G40.101 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, with 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 | ✓ |
| G40.109 | 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 | ✓ |
| G40.111 | 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 | ✓ |
| G40.119 | 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 | ✓ |
| G40.201 | 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 | ✓ |
| G40.209 | 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 | ✓ |
| G40.211 | 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 | ✓ |
| G40.219 | 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 | ✓ |
| G40.301 | Generalized idiopathic epilepsy and epileptic syndromes, not intractable, with status epilepticus | ✓ |
| G40.309 | Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus | ✓ |
| G40.309 | Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus | ✓ |
| G40.311 | Generalized idiopathic epilepsy and epileptic syndromes, intractable, with status epilepticus | ✓ |
| G40.311 | Generalized idiopathic epilepsy and epileptic syndromes, intractable, with status epilepticus | ✓ |
| G40.319 | Generalized idiopathic epilepsy and epileptic syndromes, intractable, without 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 | ✓ |
| G40.401 | Other generalized epilepsy and epileptic syndromes, not intractable, with status epilepticus | ✓ |
| G40.409 | Other generalized epilepsy and epileptic syndromes, not intractable, without status epilepticus | ✓ |
| G40.409 | Other generalized epilepsy and epileptic syndromes, not intractable, without status epilepticus | ✓ |
| G40.411 | Other generalized epilepsy and epileptic syndromes, intractable, with status epilepticus | ✓ |
| G40.411 | Other generalized epilepsy and epileptic syndromes, intractable, with status epilepticus | ✓ |
| G40.419 | Other generalized epilepsy and epileptic syndromes, intractable, without status epilepticus | ✓ |
| G40.419 | Other generalized epilepsy and epileptic syndromes, intractable, without status epilepticus | ✓ |
| G40.501 | Epileptic seizures related to external causes, not intractable, with status epilepticus | ✓ |
| 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 | ✓ |
| G40.509 | Epileptic seizures related to external causes, not intractable, without status epilepticus | ✓ |
| G40.801 | Other epilepsy, not intractable, with status epilepticus | ✓ |
| G40.801 | Other epilepsy, not intractable, with status epilepticus | ✓ |
| G40.802 | Other epilepsy, not intractable, without status epilepticus | ✓ |
| G40.802 | Other epilepsy, not intractable, without status epilepticus | ✓ |
| G40.803 | Other epilepsy, intractable, with status epilepticus | ✓ |
| G40.803 | Other epilepsy, intractable, with status epilepticus | ✓ |
| G40.804 | Other epilepsy, intractable, without status epilepticus | ✓ |
| G40.804 | Other epilepsy, intractable, without status epilepticus | ✓ |
| G40.811 | Lennox-Gastaut syndrome, not intractable, with status epilepticus | ✓ |
| G40.811 | Lennox-Gastaut syndrome, not intractable, with status epilepticus | ✓ |
| G40.812 | Lennox-Gastaut syndrome, not intractable, without status epilepticus | ✓ |
| G40.812 | Lennox-Gastaut syndrome, not intractable, without status epilepticus | ✓ |
| G40.813 | Lennox-Gastaut syndrome, intractable, with status epilepticus | ✓ |
| G40.813 | Lennox-Gastaut syndrome, intractable, with status epilepticus | ✓ |
| G40.814 | Lennox-Gastaut syndrome, intractable, without status epilepticus | ✓ |
| G40.814 | Lennox-Gastaut syndrome, intractable, without status epilepticus | ✓ |
| G40.821 | Epileptic spasms, not intractable, with status epilepticus | ✓ |
| G40.821 | Epileptic spasms, not intractable, with status epilepticus | ✓ |
| G40.822 | Epileptic spasms, not intractable, without status epilepticus | ✓ |
| G40.822 | Epileptic spasms, not intractable, without status epilepticus | ✓ |
| G40.823 | Epileptic spasms, intractable, with status epilepticus | ✓ |
| G40.823 | Epileptic spasms, intractable, with status epilepticus | ✓ |
| G40.824 | Epileptic spasms, intractable, without status epilepticus | ✓ |
| G40.824 | Epileptic spasms, intractable, without status epilepticus | ✓ |
| G40.833 | Dravet syndrome, intractable, with status epilepticus | ✓ |
| G40.833 | Dravet syndrome, intractable, with status epilepticus | ✓ |
| G40.834 | Dravet syndrome, intractable, without status epilepticus | ✓ |
| G40.834 | Dravet syndrome, intractable, without status epilepticus | ✓ |
| G40.841 | KCNQ2-related epilepsy, not intractable, with status epilepticus | ✓ |
| G40.841 | KCNQ2-related epilepsy, not intractable, with status epilepticus | ✓ |
| G40.842 | KCNQ2-related epilepsy, not intractable, without status epilepticus | ✓ |
| G40.842 | KCNQ2-related epilepsy, not intractable, without status epilepticus | ✓ |
| G40.843 | KCNQ2-related epilepsy, intractable, with status epilepticus | ✓ |
| G40.843 | KCNQ2-related epilepsy, intractable, with status epilepticus | ✓ |
| G40.844 | KCNQ2-related epilepsy, intractable, without status epilepticus | ✓ |
| G40.844 | KCNQ2-related epilepsy, intractable, without status epilepticus | ✓ |
| G40.901 | Epilepsy, unspecified, not intractable, with status epilepticus | ✓ |
| G40.901 | Epilepsy, unspecified, not intractable, with status epilepticus | ✓ |
| G40.909 | Epilepsy, unspecified, not intractable, without status epilepticus | ✓ |
| G40.909 | Epilepsy, unspecified, not intractable, without status epilepticus | ✓ |
| G40.911 | Epilepsy, unspecified, intractable, with status epilepticus | ✓ |
| G40.911 | Epilepsy, unspecified, intractable, with status epilepticus | ✓ |
| G40.919 | Epilepsy, unspecified, intractable, without status epilepticus | ✓ |
| G40.919 | Epilepsy, unspecified, intractable, without status epilepticus | ✓ |
| G40.A | Absence epileptic syndrome | — |
| G40.A | Absence epileptic syndrome | — |
| G40.A0 | Absence epileptic syndrome, not intractable | — |
| G40.A0 | Absence epileptic syndrome, not intractable | — |
| G40.A01 | Absence epileptic syndrome, not intractable, with status epilepticus | ✓ |
| G40.A01 | Absence epileptic syndrome, not intractable, with status epilepticus | ✓ |
| G40.A1 | Absence epileptic syndrome, intractable | — |
| G40.A1 | Absence epileptic syndrome, intractable | — |
| G40.A09 | Absence epileptic syndrome, not intractable, without status epilepticus | ✓ |
| G40.A09 | Absence epileptic syndrome, not intractable, without status epilepticus | ✓ |
| G40.A11 | Absence epileptic syndrome, intractable, with status epilepticus | ✓ |
| G40.A11 | Absence epileptic syndrome, intractable, with status epilepticus | ✓ |
| G40.A19 | Absence epileptic syndrome, intractable, without status epilepticus | ✓ |
| G40.A19 | Absence epileptic syndrome, intractable, without status epilepticus | ✓ |
| G40.B | Juvenile myoclonic epilepsy [impulsive petit mal] | — |
| G40.B | Juvenile myoclonic epilepsy [impulsive petit mal] | — |
| G40.B0 | Juvenile myoclonic epilepsy, not intractable | — |
| G40.B0 | Juvenile myoclonic epilepsy, not intractable | — |
| G40.B01 | Juvenile myoclonic epilepsy, not intractable, with status epilepticus | ✓ |
| G40.B01 | Juvenile myoclonic epilepsy, not intractable, with status epilepticus | ✓ |
| G40.B1 | Juvenile myoclonic epilepsy, intractable | — |
| G40.B1 | Juvenile myoclonic epilepsy, intractable | — |
| G40.B09 | Juvenile myoclonic epilepsy, not intractable, without status epilepticus | ✓ |
| G40.B09 | Juvenile myoclonic epilepsy, not intractable, without status epilepticus | ✓ |
| G40.B11 | Juvenile myoclonic epilepsy, intractable, with status epilepticus | ✓ |
| G40.B11 | Juvenile myoclonic epilepsy, intractable, with status epilepticus | ✓ |
| G40.B19 | Juvenile myoclonic epilepsy, intractable, without status epilepticus | ✓ |
| G40.B19 | Juvenile myoclonic epilepsy, intractable, without status epilepticus | ✓ |
| G40.C | Lafora progressive myoclonus epilepsy | — |
| G40.C | Lafora progressive myoclonus epilepsy | — |
| G40.C0 | Lafora progressive myoclonus epilepsy, not intractable | — |
| G40.C0 | Lafora progressive myoclonus epilepsy, not intractable | — |
| G40.C01 | Lafora progressive myoclonus epilepsy, not intractable, with status epilepticus | ✓ |
| G40.C01 | Lafora progressive myoclonus epilepsy, not intractable, with status epilepticus | ✓ |
| G40.C1 | Lafora progressive myoclonus epilepsy, intractable | — |
| G40.C1 | Lafora progressive myoclonus epilepsy, intractable | — |
| G40.C09 | Lafora progressive myoclonus epilepsy, not intractable, without status epilepticus | ✓ |
| G40.C09 | Lafora progressive myoclonus epilepsy, not intractable, without status epilepticus | ✓ |
| G40.C11 | Lafora progressive myoclonus epilepsy, intractable, with status epilepticus | ✓ |
| G40.C11 | Lafora progressive myoclonus epilepsy, intractable, with status epilepticus | ✓ |
| G40.C19 | Lafora progressive myoclonus epilepsy, intractable, without status epilepticus | ✓ |
| G40.C19 | Lafora progressive myoclonus epilepsy, intractable, without status epilepticus | ✓ |
Frequently asked questions
What is ICD-10-CM code G40?
G40 is an ICD-10-CM category covering Epilepsy and recurrent seizures. It contains 186 more specific diagnosis codes, 116 of which are billable.
Is G40 a billable code?
No — G40 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example G40.0 — Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset). 116 of the 186 codes under G40 are billable.
What codes fall under G40?
G40 includes G40.0, G40.0, G40.00, G40.00, G40.001, plus 181 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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