ICD-10 Code G40.20 – Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G40.20 – Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable
What it is
This code identifies symptomatic focal epilepsy with complex partial seizures that are not intractable. It is used when seizures begin in one brain region and the condition is not described as difficult to control.
Clinical signs
Complex partial seizures typically involve impaired awareness, staring, automatisms, or brief confusion. Clinical features vary; refer to documentation for the seizure type, focal onset, and whether awareness is affected.
When to use this code
Use G40.20 when the record documents focal or partial symptomatic epilepsy with complex partial seizures and does not state intractable or refractory disease. You should also have documentation that supports an epileptic syndrome rather than a single isolated seizure.
If the provider specifies a structural or symptomatic cause, this code may still apply as long as the seizure type and nonintractable status are clear. Check documentation when the wording is incomplete or when seizure classification is uncertain.
Do not use for
Do not use this code for generalized epilepsy, simple partial seizures, or seizures described as intractable. If the note only says “seizure” without epilepsy type or control status, check documentation.
Coding tip
Confirm both focal/partial epilepsy and the “not intractable” wording before assigning G40.20.