ICD-10-CM > C00-D49 > C43-C44 > C4A > C4A.5 C4A.5 Merkel cell carcinoma of trunk Non-Billable/Non-Specific Type 2 Excludes malignant neoplasm of anus NOS (C21.0)malignant neoplasm of scrotum (C63.2) Codes C4A.51Merkel cell carcinoma of anal skinC4A.52Merkel cell carcinoma of skin of breastC4A.59Merkel cell carcinoma of other part of trunk