ICD-10 Code for Lennox-Gastaut syndrome

The ICD-10-CM code for lennox-gastaut syndrome is G40.812 — Lennox-Gastaut syndrome, not intractable, without status epilepticus. This is the code the Alphabetic Index gives for lennox-gastaut syndrome with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).

Billable

Which lennox-gastaut syndrome code should you use?

The Alphabetic Index lists 4 codes under Lennox-Gastaut syndrome. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.

By type

intractable	G40.814	Lennox-Gastaut syndrome, intractable, without status epilepticus
not intractable	G40.812	Lennox-Gastaut syndrome, not intractable, without status epilepticus

Lennox-Gastaut syndrome intractable

with status epilepticus	G40.813	Lennox-Gastaut syndrome, intractable, with status epilepticus
without status epilepticus	G40.814	Lennox-Gastaut syndrome, intractable, without status epilepticus

Lennox-Gastaut syndrome not intractable

with status epilepticus	G40.811	Lennox-Gastaut syndrome, not intractable, with status epilepticus
without status epilepticus	G40.812	Lennox-Gastaut syndrome, not intractable, without status epilepticus

Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources