C4A - Merkel cell carcinoma
C4A.5 - Merkel cell carcinoma of trunk
Excludes 2:
-malignant neoplasm of anus NOS C21.0)
-malignant neoplasm of scrotum C63.2)
C4A.51 - Merkel cell carcinoma of anal skin
C4A.52 - Merkel cell carcinoma of skin of breast
C4A.59 - Merkel cell carcinoma of other part of trunk