ICD-10 Code G40.30 – Generalized idiopathic epilepsy and epileptic syndromes, not intractable (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G40.30 – Generalized idiopathic epilepsy and epileptic syndromes, not intractable
What it is
This code identifies generalized idiopathic epilepsy or an epileptic syndrome that is not documented as intractable. It applies when seizures are generalized and the record does not support drug resistance.
Clinical signs
Clinical features vary; refer to documentation. Typical records may describe generalized seizure activity, absence of focal onset, and an idiopathic or primary epilepsy pattern.
When to use this code
Use G40.30 when the provider documents generalized idiopathic epilepsy or a generalized epileptic syndrome and does not state that it is intractable. Apply it when the diagnosis is established and the chart supports a non-intractable course. Check documentation if seizure type, syndrome, or control status is unclear.
Do not use for
Do not use this code if the epilepsy is documented as intractable or if the record specifies a different epilepsy type. Check documentation for focal, symptomatic, or unspecified seizure disorders.
Coding tip
Code the seizure syndrome exactly as documented, and verify whether “not intractable” is stated or implied by the provider.