C4A.2
C4A.2 — Merkel cell carcinoma of ear and external auricular canal
Non-billable headerICD-10-CM
C4A.2 is a non-billable header ICD-10-CM code for merkel cell carcinoma of ear and external auricular canal. It cannot be billed on its own: choose one of the more specific child codes below.
Risk adjustment
C4A.2 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code to one of these instead C4A.2
3 child codes. Green means billable.
Related codes at this level
Codes that share C4A. If C4A.2 is not quite right, the correct code is usually one of these.
- C4A.0Merkel cell carcinoma of lip
- C4A.1Merkel cell carcinoma of eyelid, including canthus
- C4A.3Merkel cell carcinoma of other and unspecified parts of face
- C4A.4Merkel cell carcinoma of scalp and neck
- C4A.5Merkel cell carcinoma of trunk
- C4A.6Merkel cell carcinoma of upper limb, including shoulder
- C4A.7Merkel cell carcinoma of lower limb, including hip
- C4A.8Merkel cell carcinoma of overlapping sites
- C4A.9Merkel cell carcinoma, unspecified
Questions about C4A.2
- Is C4A.2 a billable ICD-10-CM code?
- No. C4A.2 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does C4A.2 sit in the tabular list?
- Neoplasms (C00-D49), in the block Melanoma and other malignant neoplasms of skin (C43-C44).