ICD-10 Code G40.A09 – Absence epileptic syndrome, not intractable, without status epilepticus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G40.A09 – Absence epileptic syndrome, not intractable, without status epilepticus
What it is
This code identifies absence epileptic syndrome in a patient whose seizures are not intractable and who is not in status epilepticus. It refers to a seizure disorder marked by recurrent absence seizures rather than a single isolated event.
Clinical signs
Typical findings include brief staring spells, sudden loss of awareness, and immediate return to baseline. Clinical features vary; refer to documentation for seizure type, frequency, and any EEG-supported diagnosis.
When to use this code
Use this code when the record clearly documents absence epileptic syndrome and states that the condition is not intractable. It also applies when there is no status epilepticus present. If the note only says “absence seizures,” check documentation to confirm the syndrome diagnosis.
Do not use for
Do not use this code for intractable absence epilepsy or for episodes documented as status epilepticus. Do not assign it when the diagnosis is uncertain or the chart only mentions a seizure history without absence epileptic syndrome.
Coding tip
Verify both “not intractable” and “without status epilepticus” in the provider’s documentation before selecting G40.A09.