ICD-10-CM · Chapter 6 · G00-G99
G40 Epilepsy and recurrent seizures
Excludes 1 (cannot be coded together)
- conversion disorder with seizures (F44.5)
- convulsions NOS (R56.9)
- post traumatic seizures (R56.1)
- seizure (convulsive) NOS (R56.9)
- seizure of newborn (P90)
Excludes 2 (not included here)
- hippocampal sclerosis (G93.81)
- mesial temporal sclerosis (G93.81)
- temporal sclerosis (G93.81)
- Todd's paralysis (G83.84)
Notes
- the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
Subcodes
Each subcode links to a detail page with full clinical annotations.
| Code | Description | Billable |
|---|---|---|
| G40..0 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset | No |
| G40..00 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable | No |
| G40..001 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, with status epilepticus | Yes |
| G40..009 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, without status epilepticus | Yes |
| G40..01 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable | No |
| G40..011 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, with status epilepticus | Yes |
| G40..019 | Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, without status epilepticus | Yes |
| G40..1 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures | No |
| G40..10 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable | No |
| G40..101 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, with status epilepticus | Yes |
| G40..109 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, without status epilepticus | Yes |
| G40..11 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable | No |
| G40..111 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable, with status epilepticus | Yes |
| G40..119 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable, without status epilepticus | Yes |
| G40..2 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures | No |
| G40..20 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable | No |
| G40..201 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, with status epilepticus | Yes |
| G40..209 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, without status epilepticus | Yes |
| G40..21 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable | No |
| G40..211 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable, with status epilepticus | Yes |
| G40..219 | Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable, without status epilepticus | Yes |
| G40..3 | Generalized idiopathic epilepsy and epileptic syndromes | No |
| G40..30 | Generalized idiopathic epilepsy and epileptic syndromes, not intractable | No |
| G40..301 | Generalized idiopathic epilepsy and epileptic syndromes, not intractable, with status epilepticus | Yes |
| G40..309 | Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus | Yes |
| G40..31 | Generalized idiopathic epilepsy and epileptic syndromes, intractable | No |
| G40..311 | Generalized idiopathic epilepsy and epileptic syndromes, intractable, with status epilepticus | Yes |
| G40..319 | Generalized idiopathic epilepsy and epileptic syndromes, intractable, without status epilepticus | Yes |
| G40..A | Absence epileptic syndrome | No |
| G40..A0 | Absence epileptic syndrome, not intractable | No |
| G40..A01 | Absence epileptic syndrome, not intractable, with status epilepticus | Yes |
| G40..A09 | Absence epileptic syndrome, not intractable, without status epilepticus | Yes |
| G40..A1 | Absence epileptic syndrome, intractable | No |
| G40..A11 | Absence epileptic syndrome, intractable, with status epilepticus | Yes |
| G40..A19 | Absence epileptic syndrome, intractable, without status epilepticus | Yes |
| G40..B | Juvenile myoclonic epilepsy [impulsive petit mal] | No |
| G40..B0 | Juvenile myoclonic epilepsy, not intractable | No |
| G40..B01 | Juvenile myoclonic epilepsy, not intractable, with status epilepticus | Yes |
| G40..B09 | Juvenile myoclonic epilepsy, not intractable, without status epilepticus | Yes |
| G40..B1 | Juvenile myoclonic epilepsy, intractable | No |
| G40..B11 | Juvenile myoclonic epilepsy, intractable, with status epilepticus | Yes |
| G40..B19 | Juvenile myoclonic epilepsy, intractable, without status epilepticus | Yes |
| G40..C | Lafora progressive myoclonus epilepsy | No |
| G40..C0 | Lafora progressive myoclonus epilepsy, not intractable | No |
| G40..C01 | Lafora progressive myoclonus epilepsy, not intractable, with status epilepticus | Yes |
| G40..C09 | Lafora progressive myoclonus epilepsy, not intractable, without status epilepticus | Yes |
| G40..C1 | Lafora progressive myoclonus epilepsy, intractable | No |
| G40..C11 | Lafora progressive myoclonus epilepsy, intractable, with status epilepticus | Yes |
| G40..C19 | Lafora progressive myoclonus epilepsy, intractable, without status epilepticus | Yes |
| G40..4 | Other generalized epilepsy and epileptic syndromes | No |
| G40..40 | Other generalized epilepsy and epileptic syndromes, not intractable | No |
| G40..401 | Other generalized epilepsy and epileptic syndromes, not intractable, with status epilepticus | Yes |
| G40..409 | Other generalized epilepsy and epileptic syndromes, not intractable, without status epilepticus | Yes |
| G40..41 | Other generalized epilepsy and epileptic syndromes, intractable | No |
| G40..411 | Other generalized epilepsy and epileptic syndromes, intractable, with status epilepticus | Yes |
| G40..419 | Other generalized epilepsy and epileptic syndromes, intractable, without status epilepticus | Yes |
| G40..42 | Cyclin-Dependent Kinase-Like 5 Deficiency Disorder | Yes |
| G40..5 | Epileptic seizures related to external causes | No |
| G40..50 | Epileptic seizures related to external causes, not intractable | No |
| G40..501 | Epileptic seizures related to external causes, not intractable, with status epilepticus | Yes |
| G40..509 | Epileptic seizures related to external causes, not intractable, without status epilepticus | Yes |
| G40..8 | Other epilepsy and recurrent seizures | No |
| G40..80 | Other epilepsy | No |
| G40..801 | Other epilepsy, not intractable, with status epilepticus | Yes |
| G40..802 | Other epilepsy, not intractable, without status epilepticus | Yes |
| G40..803 | Other epilepsy, intractable, with status epilepticus | Yes |
| G40..804 | Other epilepsy, intractable, without status epilepticus | Yes |
| G40..81 | Lennox-Gastaut syndrome | No |
| G40..811 | Lennox-Gastaut syndrome, not intractable, with status epilepticus | Yes |
| G40..812 | Lennox-Gastaut syndrome, not intractable, without status epilepticus | Yes |
| G40..813 | Lennox-Gastaut syndrome, intractable, with status epilepticus | Yes |
| G40..814 | Lennox-Gastaut syndrome, intractable, without status epilepticus | Yes |
| G40..82 | Epileptic spasms | No |
| G40..821 | Epileptic spasms, not intractable, with status epilepticus | Yes |
| G40..822 | Epileptic spasms, not intractable, without status epilepticus | Yes |
| G40..823 | Epileptic spasms, intractable, with status epilepticus | Yes |
| G40..824 | Epileptic spasms, intractable, without status epilepticus | Yes |
| G40..83 | Dravet syndrome | No |
| G40..833 | Dravet syndrome, intractable, with status epilepticus | Yes |
| G40..834 | Dravet syndrome, intractable, without status epilepticus | Yes |
| G40..84 | KCNQ2-related epilepsy | No |
| G40..841 | KCNQ2-related epilepsy, not intractable, with status epilepticus | Yes |
| G40..842 | KCNQ2-related epilepsy, not intractable, without status epilepticus | Yes |
| G40..843 | KCNQ2-related epilepsy, intractable, with status epilepticus | Yes |
| G40..844 | KCNQ2-related epilepsy, intractable, without status epilepticus | Yes |
| G40..89 | Other seizures | Yes |
| G40..9 | Epilepsy, unspecified | No |
| G40..90 | Epilepsy, unspecified, not intractable | No |
| G40..901 | Epilepsy, unspecified, not intractable, with status epilepticus | Yes |
| G40..909 | Epilepsy, unspecified, not intractable, without status epilepticus | Yes |
| G40..91 | Epilepsy, unspecified, intractable | No |
| G40..911 | Epilepsy, unspecified, intractable, with status epilepticus | Yes |
| G40..919 | Epilepsy, unspecified, intractable, without status epilepticus | Yes |
Plain-language term for this code
The following entry in the US Medical Glossary corresponds to ICD-10-CM category G40:
- Epilepsy — Epilepsia
Last reviewed: September 2026