ICD-10-CM > C00-D49 > C43-C44 > C4A > C4A.1 > C4A.11 C4A.11 Merkel cell carcinoma of right eyelid, including canthus Non-Billable/Non-Specific Codes C4A.111Merkel cell carcinoma of right upper eyelid, including canthusC4A.112Merkel cell carcinoma of right lower eyelid, including canthus