G40.84

Non-billable

KCNQ2-related epilepsy

G40.84 is the ICD-10-CM code for KCNQ2-related epilepsy. It is a non-billable category code — use a more specific child code such as G40.841 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 G40.84?
G40.84 is the ICD-10-CM code for "KCNQ2-related epilepsy". It falls under G00-G99 Diseases of the nervous system.
Is G40.84 a billable code?
No — G40.84 is a non-billable header code. Use a more specific child code (such as G40.841) for billing.
What are the subcodes of G40.84?
G40.84 has 4 more specific child codes, including G40.841, G40.842, G40.843.

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

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