C4A — Merkel cell carcinoma
Not billable
Is C4A billable?
No — C4A is a non-billable header code. C4A 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 24 billable codes beneath C4A.
Billable codes under this header
- C4A.0Merkel cell carcinoma of lip
- C4A.4Merkel cell carcinoma of scalp and neck
- C4A.8Merkel cell carcinoma of overlapping sites
- C4A.9Merkel cell carcinoma, unspecified
- C4A.10Merkel cell carcinoma of unspecified eyelid, including canthus
- C4A.20Merkel cell carcinoma of unspecified ear and external auricular canal
- C4A.21Merkel cell carcinoma of right ear and external auricular canal
- C4A.22Merkel cell carcinoma of left ear and external auricular canal
- C4A.30Merkel cell carcinoma of unspecified part of face
- C4A.31Merkel cell carcinoma of nose
- C4A.39Merkel cell carcinoma of other parts of face
- C4A.51Merkel cell carcinoma of anal skin
- C4A.52Merkel cell carcinoma of skin of breast
- C4A.59Merkel cell carcinoma of other part of trunk
- C4A.60Merkel cell carcinoma of unspecified upper limb, including shoulder
- C4A.61Merkel cell carcinoma of right upper limb, including shoulder
- C4A.62Merkel cell carcinoma of left upper limb, including shoulder
- C4A.70Merkel cell carcinoma of unspecified lower limb, including hip
- C4A.71Merkel cell carcinoma of right lower limb, including hip
- C4A.72Merkel cell carcinoma of left lower limb, including hip
- C4A.111Merkel cell carcinoma of right upper eyelid, including canthus
- C4A.112Merkel cell carcinoma of right lower eyelid, including canthus
- C4A.121Merkel cell carcinoma of left upper eyelid, including canthus
- C4A.122Merkel cell carcinoma of left lower eyelid, including canthus
C4A at a glance
| Code | C4A |
|---|---|
| Description | Merkel cell carcinoma |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
What codes fall under C4A? (10)
- 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.5Merkel cell carcinoma of trunknot billable
- 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
How long has C4A existed?
C4A 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.