ICD-10 Code G40.001 – Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, with status epilepticus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G40.001 – Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, with status epilepticus
What it is
This code identifies idiopathic focal epilepsy with seizures that begin in one area of the brain and progress to status epilepticus. Use it when the record states the epilepsy is not intractable and the seizure episode is prolonged or continuous.
Clinical signs
Typical documentation may describe recurrent focal seizures, localized onset, and prolonged seizure activity consistent with status epilepticus. Clinical features vary; refer to documentation for the seizure type and whether consciousness or motor activity is affected.
When to use this code
Use G40.001 when the provider documents idiopathic focal epilepsy with localized-onset seizures and also identifies status epilepticus. You should confirm that the condition is not intractable and that the record supports an epileptic syndrome rather than a single isolated seizure. If the chart does not clearly state these elements, check documentation.
Do not use for
Do not use this code for generalized epilepsy, intractable epilepsy, or seizures without documented status epilepticus. Do not assign it when the seizure type or localization is unclear.
Coding tip
Verify both the focal onset and the status epilepticus wording before coding, because missing either detail can change the code selection.