ICD-10 Code G40.011 – Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, with status epilepticus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G40.011 – Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, with status epilepticus
What it is
This code identifies focal idiopathic epilepsy with localized-onset seizures that are difficult to control and have progressed to status epilepticus. Use it when the documentation clearly states both intractability and ongoing seizure activity consistent with status epilepticus.
Clinical signs
Clinical features vary; refer to documentation. Typical records describe recurrent focal seizures with onset in one brain region, poor response to therapy, and an episode of prolonged or repeated seizures without full recovery between events.
When to use this code
Use G40.011 when the provider documents idiopathic focal epilepsy, seizures of localized onset, and that the condition is intractable. It also requires status epilepticus to be documented, not just a single brief seizure. If the note does not confirm all elements, check documentation.
Do not use for
Do not use this code for controlled focal epilepsy, generalized seizure disorders, or epilepsy without status epilepticus. Do not assume intractability unless the record explicitly states it.
Coding tip
Verify that the chart supports focal onset, idiopathic epilepsy, intractability, and status epilepticus before assigning G40.011.