G40.84 — KCNQ2-related epilepsy
Is G40.84 billable?
No — G40.84 is a non-billable header code. G40.84 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 4 billable codes beneath G40.84.
Billable codes under this header
G40.84 at a glance
| Code | G40.84 |
|---|---|
| Description | KCNQ2-related epilepsy |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together — inherited from G40
The conditions below can never be reported together with G40.84 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes2 — not included here — inherited from Chapter 6
The conditions below are not part of G40.84, but a patient may have both at the same time. When documentation supports it, G40.84 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Excludes2 — not included here — inherited from G40
The conditions below are not part of G40.84, but a patient may have both at the same time. When documentation supports it, G40.84 and the excluded code may both be reported.
What codes fall under G40.84? (4)
How long has G40.84 existed?
G40.84 first appears in FY2025.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.