ICD-10 Code G40.10 – Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G40.10 – Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable
What it is
This code identifies focal epilepsy caused by an underlying brain lesion or condition, with simple partial seizures and no intractability. Use it when the seizure focus is localized and awareness is preserved.
Clinical signs
Typical findings include brief focal motor, sensory, autonomic, or psychic seizure symptoms without loss of consciousness. Clinical features vary; refer to documentation.
When to use this code
Use G40.10 when the provider documents symptomatic focal epilepsy with simple partial seizures and states it is not intractable. It may also fit when records describe a localized seizure disorder due to a known structural or symptomatic cause. Check documentation for seizure type and refractoriness.
Do not use for
Do not use this code for generalized epilepsy, complex partial seizures, or intractable epilepsy. If the record does not clearly state “simple partial” or “not intractable,” check documentation.
Coding tip
Confirm both the focal seizure type and the nonintractable status in the provider note before assigning G40.10.