ICD-10-CM > C00-D49 > C43-C44 > C4A > C4A.6 C4A.6 Merkel cell carcinoma of upper limb, including shoulder Non-Billable/Non-Specific Codes C4A.60Merkel cell carcinoma of unspecified upper limb, including shoulderC4A.61Merkel cell carcinoma of right upper limb, including shoulderC4A.62Merkel cell carcinoma of left upper limb, including shoulder