ICD-10 Code G40.109 – Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, without status epilepticus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G40.109 – Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, without status epilepticus
What it is
This code identifies focal symptomatic epilepsy with simple partial seizures that are not intractable and do not include status epilepticus. Use it when the seizure starts in one brain area and awareness is preserved.
Clinical signs
Typical findings include brief focal motor, sensory, autonomic, or psychic seizure activity with retained awareness. Clinical features vary; refer to documentation for the seizure type and whether it is symptomatic.
When to use this code
Use G40.109 when the record documents focal symptomatic epilepsy, simple partial seizures, and no status epilepticus. The provider should also indicate that the condition is not intractable, or the chart should clearly support that interpretation. Check documentation if laterality or seizure details are unclear.
Do not use for
Do not use this code for intractable epilepsy, status epilepticus, or generalized seizure disorders. If the note describes a different focal seizure type, choose the more specific documented code.
Coding tip
Verify that the record supports both “simple partial” and “not intractable” before assigning G40.109.