G40.84Header code — not billable
KCNQ2-related epilepsy
- Chapter
- 6. Diseases of the nervous system
- Category
- G40
- Effective date
- October 1, 2026
Related codes in category G40
G40Epilepsy and recurrent seizuresG40.0Local-rel (focal) idio epilepsy w seizures of loc onsetG40.00Local-rel (focal) idio epi w seiz of loc onset, not ntrctG40.001Local-rel idio epi w seiz of loc onst, not ntrct, w stat epiYesG40.009Local-rel idio epi w seiz of loc onst,not ntrct,w/o stat epiYesG40.01Local-rel (focal) idio epi w seizures of loc onset, ntrctG40.011Local-rel idio epi w seiz of loc onset, ntrct, w stat epiYesG40.019Local-rel idio epi w seiz of loc onset, ntrct, w/o stat epiYesG40.1Local-rel (focal) symptc epilepsy w simple partial seizuresG40.10Local-rel symptc epi w simple partial seiz, not ntrctG40.101Local-rel symptc epi w simp part seiz, not ntrct, w stat epiYesG40.109Local-rel symptc epi w simp prt seiz,not ntrct, w/o stat epiYes
Frequently asked questions
What is ICD-10 code G40.84?
G40.84 is an ICD-10-CM diagnosis code for KCNQ2-related epilepsy.
Is G40.84 a billable code?
No. G40.84 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is G40.84 in?
G40.84 falls under Chapter 6: Diseases of the nervous system.
When did G40.84 become effective?
G40.84 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to G40.84?
G40.84 belongs to category G40, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.