C4A - Merkel cell carcinoma
C4A.1 - Merkel cell carcinoma of eyelid, including canthus
C4A.10 - Merkel cell carcinoma of unspecified eyelid, including canthus
C4A.11 - Merkel cell carcinoma of right eyelid, including canthus
C4A.12 - Merkel cell carcinoma of left eyelid, including canthus