C21 - Malignant neoplasm of anus and anal canal
C21.8 - Malignant neoplasm of overlapping sites of rectum, anus and anal canal
InclusionTerm:
-Malignant neoplasm of anorectal junction
-Malignant neoplasm of anorectum
-Primary malignant neoplasm of two or more contiguous sites of rectum, anus and anal canal