NPI Atlas

ICD-10 Code for Lennox-Gastaut Syndrome

The default ICD-10-CM 2027 code for lennox-gastaut syndrome is G40.812 – Lennox-Gastaut syndrome, not intractable, without status epilepticus. More specific codes depend on the details documented, as listed in the official index (4 codes, 4 billable).

Main code: G40.812 – Lennox-Gastaut syndrome, not intractable, without status epilepticus
Billable: Yes

Index entries for Lennox-Gastaut syndrome

intractable – G40.814
- with status epilepticus – G40.813
- without status epilepticus – G40.814
not intractable – G40.812
- with status epilepticus – G40.811
- without status epilepticus – G40.812

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.