C4A.5 — Merkel cell carcinoma of trunk
Not billable
Is C4A.5 billable?
No — C4A.5 is a non-billable header code. C4A.5 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 3 billable codes beneath C4A.5.
C4A.5 at a glance
| Code | C4A.5 |
|---|---|
| Description | Merkel cell carcinoma of trunk |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes2 — not included here
The conditions below are not part of C4A.5, but a patient may have both at the same time. When documentation supports it, C4A.5 and the excluded code may both be reported.
What codes fall under C4A.5? (3)
How long has C4A.5 existed?
C4A.5 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
What other codes are in the C4A family? (9)
- C4A.0Merkel cell carcinoma of lip
- C4A.1Merkel cell carcinoma of eyelid, including canthusnot billable
- C4A.2Merkel cell carcinoma of ear and external auricular canalnot billable
- C4A.3Merkel cell carcinoma of other and unspecified parts of facenot billable
- C4A.4Merkel cell carcinoma of scalp and neck
- C4A.6Merkel cell carcinoma of upper limb, including shouldernot billable
- C4A.7Merkel cell carcinoma of lower limb, including hipnot billable
- C4A.8Merkel cell carcinoma of overlapping sites
- C4A.9Merkel cell carcinoma, unspecified