ICD-10-CM · Chapter 2 · C00-D49
C4A Merkel cell carcinoma
Subcodes
Each subcode links to a detail page with full clinical annotations.
| Code | Description | Billable |
|---|---|---|
| C4A..0 | Merkel cell carcinoma of lip | Yes |
| C4A..1 | Merkel cell carcinoma of eyelid, including canthus | No |
| C4A..10 | Merkel cell carcinoma of unspecified eyelid, including canthus | Yes |
| C4A..11 | Merkel cell carcinoma of right eyelid, including canthus | No |
| C4A..111 | Merkel cell carcinoma of right upper eyelid, including canthus | Yes |
| C4A..112 | Merkel cell carcinoma of right lower eyelid, including canthus | Yes |
| C4A..12 | Merkel cell carcinoma of left eyelid, including canthus | No |
| C4A..121 | Merkel cell carcinoma of left upper eyelid, including canthus | Yes |
| C4A..122 | Merkel cell carcinoma of left lower eyelid, including canthus | Yes |
| C4A..2 | Merkel cell carcinoma of ear and external auricular canal | No |
| C4A..20 | Merkel cell carcinoma of unspecified ear and external auricular canal | Yes |
| C4A..21 | Merkel cell carcinoma of right ear and external auricular canal | Yes |
| C4A..22 | Merkel cell carcinoma of left ear and external auricular canal | Yes |
| C4A..3 | Merkel cell carcinoma of other and unspecified parts of face | No |
| C4A..30 | Merkel cell carcinoma of unspecified part of face | Yes |
| C4A..31 | Merkel cell carcinoma of nose | Yes |
| C4A..39 | Merkel cell carcinoma of other parts of face | Yes |
| C4A..4 | Merkel cell carcinoma of scalp and neck | Yes |
| C4A..5 | Merkel cell carcinoma of trunk | No |
| C4A..51 | Merkel cell carcinoma of anal skin | Yes |
| C4A..52 | Merkel cell carcinoma of skin of breast | Yes |
| C4A..59 | Merkel cell carcinoma of other part of trunk | Yes |
| C4A..6 | Merkel cell carcinoma of upper limb, including shoulder | No |
| C4A..60 | Merkel cell carcinoma of unspecified upper limb, including shoulder | Yes |
| C4A..61 | Merkel cell carcinoma of right upper limb, including shoulder | Yes |
| C4A..62 | Merkel cell carcinoma of left upper limb, including shoulder | Yes |
| C4A..7 | Merkel cell carcinoma of lower limb, including hip | No |
| C4A..70 | Merkel cell carcinoma of unspecified lower limb, including hip | Yes |
| C4A..71 | Merkel cell carcinoma of right lower limb, including hip | Yes |
| C4A..72 | Merkel cell carcinoma of left lower limb, including hip | Yes |
| C4A..8 | Merkel cell carcinoma of overlapping sites | Yes |
| C4A..9 | Merkel cell carcinoma, unspecified | Yes |
Related pages
Last reviewed: September 2026