ICD-10 Code G40.4 – Other generalized epilepsy and epileptic syndromes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G40.4 – Other generalized epilepsy and epileptic syndromes
What it is
This code identifies generalized epilepsy syndromes that do not fit a more specific ICD-10 category. Use it when the seizure disorder is generalized from onset and the record supports an epileptic syndrome, but documentation is not more specific.
Clinical signs
Clinical features vary; refer to documentation. Typical generalized epilepsy may include seizures affecting both sides of the brain at onset, with possible absence, tonic-clonic, or myoclonic events.
When to use this code
Use G40.4 when the clinician documents a generalized epilepsy syndrome and no more specific subtype is named. It also fits when the chart states “other generalized epilepsy” or a generalized epileptic syndrome that cannot be classified elsewhere. Check documentation for the exact syndrome name and seizure type.
Do not use for
Do not use this code for focal epilepsy, single unprovoked seizures, or seizure-like events without an epilepsy diagnosis. If the record names a more specific generalized epilepsy code, code that instead.
Coding tip
Match the diagnosis wording exactly; if the note is vague, query for the specific generalized epilepsy syndrome.