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G40.81

Non-billable

Lennox-Gastaut syndrome

G40.81 is the ICD-10-CM code for Lennox-Gastaut syndrome. It is a non-billable category code — use a more specific child code such as G40.811 for billing.

Status
Header (non-billable)
Chapter
G00-G99
Parent
G40.8
Subcodes
4
Edition
FY2026

G00-G99 Diseases of the nervous system

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code G40.81?
G40.81 is the ICD-10-CM code for "Lennox-Gastaut syndrome". It falls under G00-G99 Diseases of the nervous system.
Is G40.81 a billable code?
No — G40.81 is a non-billable header code. Use a more specific child code (such as G40.811) for billing.
What are the subcodes of G40.81?
G40.81 has 4 more specific child codes, including G40.811, G40.812, G40.813.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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