ICD-10 Code G40 – Epilepsy and recurrent seizures (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G40 – Epilepsy and recurrent seizures
What it is
G40 identifies epilepsy, a disorder marked by recurrent unprovoked seizures. Use it when the record documents epilepsy or repeated seizure episodes rather than a single isolated event.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records describe recurrent seizures, altered awareness, convulsions, or postictal confusion, with seizure type or syndrome sometimes specified.
When to use this code
Use G40 when the clinician documents epilepsy, recurrent seizures, or a seizure disorder. Choose the most specific subcode available if the note identifies seizure type, intractability, or status epilepticus. Check documentation when the record only says “seizure” without confirming epilepsy.
Do not use for
Do not use G40 for a single, provoked seizure or for events due to fever, syncope, or other non-epileptic causes. Check documentation if the diagnosis is uncertain.
Coding tip
Code the documented epilepsy type and any associated status, rather than defaulting to the unspecified category.