ICD-10 Code G40.812 – Lennox-Gastaut syndrome, not intractable, without status epilepticus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G40.812 – Lennox-Gastaut syndrome, not intractable, without status epilepticus
What it is
This code identifies Lennox-Gastaut syndrome, a severe childhood-onset epilepsy syndrome, when seizures are not described as intractable and there is no status epilepticus. Use it for the specific diagnosis, not for general seizure disorders.
Clinical signs
Typical features include multiple seizure types, developmental delay or intellectual impairment, and abnormal EEG findings. Clinical features vary; refer to documentation.
When to use this code
Use G40.812 when the record clearly documents Lennox-Gastaut syndrome and states the condition is not intractable. It also applies when the provider specifies no status epilepticus is present. If the note only says epilepsy or seizures, check documentation.
Do not use for
Do not use this code for Lennox-Gastaut syndrome described as intractable, or when status epilepticus is documented. Also avoid it if the chart does not confirm the syndrome itself. Check documentation.
Coding tip
Verify both qualifiers, not intractable and without status epilepticus, before assigning G40.812.