C4A Merkel cell carcinoma
ICD-10-CM category C4A sits in Chapter 2 (Neoplasms, C00-D49). It contains 24 billable codes for FY2027, effective October 1, 2026 to September 30, 2027. Always code to the most specific code available: a code with more characters that describes the diagnosis more precisely takes priority over a shorter one.
Subcategories
C4A.1 Merkel cell carcinoma of eyelid, including canthusC4A.11 Merkel cell carcinoma of right eyelid, including canthusC4A.12 Merkel cell carcinoma of left eyelid, including canthusC4A.2 Merkel cell carcinoma of ear and external auricular canalC4A.3 Merkel cell carcinoma of other and unspecified parts of faceC4A.5 Merkel cell carcinoma of trunkC4A.6 Merkel cell carcinoma of upper limb, including shoulderC4A.7 Merkel cell carcinoma of lower limb, including hip
Billable codes in C4A
| Code | Description |
|---|---|
C4A.0 | Merkel cell carcinoma of lip |
C4A.10 | Merkel cell carcinoma of unspecified eyelid, including canthus |
C4A.111 | Merkel cell carcinoma of right upper eyelid, including canthus |
C4A.112 | Merkel cell carcinoma of right lower eyelid, including canthus |
C4A.121 | Merkel cell carcinoma of left upper eyelid, including canthus |
C4A.122 | Merkel cell carcinoma of left lower eyelid, including canthus |
C4A.20 | Merkel cell carcinoma of unspecified ear and external auricular canal |
C4A.21 | Merkel cell carcinoma of right ear and external auricular canal |
C4A.22 | Merkel cell carcinoma of left ear and external auricular canal |
C4A.30 | Merkel cell carcinoma of unspecified part of face |
C4A.31 | Merkel cell carcinoma of nose |
C4A.39 | Merkel cell carcinoma of other parts of face |
C4A.4 | Merkel cell carcinoma of scalp and neck |
C4A.51 | Merkel cell carcinoma of anal skin |
C4A.52 | Merkel cell carcinoma of skin of breast |
C4A.59 | Merkel cell carcinoma of other part of trunk |
C4A.60 | Merkel cell carcinoma of unspecified upper limb, including shoulder |
C4A.61 | Merkel cell carcinoma of right upper limb, including shoulder |
C4A.62 | Merkel cell carcinoma of left upper limb, including shoulder |
C4A.70 | Merkel cell carcinoma of unspecified lower limb, including hip |
C4A.71 | Merkel cell carcinoma of right lower limb, including hip |
C4A.72 | Merkel cell carcinoma of left lower limb, including hip |
C4A.8 | Merkel cell carcinoma of overlapping sites |
C4A.9 | Merkel cell carcinoma, unspecified |
Search within ICD-10-CM for C4A and related codes