G40.4
ICD-10Non-billable categoryOther generalized epilepsy and epileptic syndromes
Official ICD-10-CM descriptor (FY2026)
Other generalized epilepsy and epileptic syndromes
G40.4 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Inclusion terms
- Epilepsy with grand mal seizures on awakening
- Epilepsy with myoclonic absences
- Epilepsy with myoclonic-astatic seizures
- Grand mal seizure NOS
- Nonspecific atonic epileptic seizures
- Nonspecific clonic epileptic seizures
- Nonspecific myoclonic epileptic seizures
- Nonspecific tonic epileptic seizures
- Nonspecific tonic-clonic epileptic seizures
- Symptomatic early myoclonic encephalopathy
ICD-10-CM FY2026 defines 3 codes beneath G40.4. See the ICD-10-CM index for what this site publishes.
Related codes in G40
- G40.0Local-rel (focal) idio epilepsy w seizures of loc onsetcategory
- G40.1Local-rel (focal) symptc epilepsy w simple partial seizurescategory
- G40.2Local-rel (focal) symptc epilepsy w complex partial seizurescategory
- G40.3Generalized idiopathic epilepsy and epileptic syndromescategory
- G40.AAbsence epileptic syndromecategory
- G40.BJuvenile myoclonic epilepsy [impulsive petit mal]category
- G40.CLafora progressive myoclonus epilepsycategory
- G40.5Epileptic seizures related to external causescategory
- G40.8Other epilepsy and recurrent seizurescategory
- G40.9Epilepsy, unspecifiedcategory
Where this code sits
- Parent code
- G40
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.