ICD-10 Code G40.11 – Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G40.11 – Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable
What it is
This code identifies a focal, symptomatic epilepsy syndrome with simple partial seizures that are difficult to control. The seizures begin in one brain region and do not cause loss of consciousness.
Clinical signs
Typical features include brief focal motor, sensory, or autonomic seizure activity with awareness preserved. Clinical features vary; refer to documentation for the seizure type, focal onset, and intractability.
When to use this code
Use G40.11 when the provider documents focal symptomatic epilepsy with simple partial seizures and states that it is intractable or medically refractory. Apply it when the record supports ongoing seizures despite appropriate management.
Check documentation for the specific epilepsy syndrome and seizure description. If the note does not clearly identify intractability or simple partial seizures, you should not assume this code.
Do not use for
Do not use this code for generalized epilepsy, absence seizures, or focal seizures with impaired awareness. Do not use it if the chart does not document intractability.
Coding tip
Verify both focal symptomatic epilepsy and intractable status in the provider note before assigning G40.11.