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C21

Malignant neoplasm of anus and anal canal

• malignant carcinoid tumors of the colon (C7A.02-)
• malignant melanoma of anal margin (C43.51)
• malignant melanoma of anal skin (C43.51)
• malignant melanoma of perianal skin (C43.51)
• other and unspecified malignant neoplasm of anal margin (C44.500, C44.510, C44.520, C44.590)
• other and unspecified malignant neoplasm of anal skin (C44.500, C44.510, C44.520, C44.590)
• other and unspecified malignant neoplasm of perianal skin (C44.500, C44.510, C44.520, C44.590)

C21.0

Malignant neoplasm of anus, unspecified

C21.1

Malignant neoplasm of anal canal

• Malignant neoplasm of anal sphincter

C21.2

Malignant neoplasm of cloacogenic zone

C21.8

Malignant neoplasm of overlapping sites of rectum, anus and anal canal

• Malignant neoplasm of anorectal junction
• Malignant neoplasm of anorectum
• Primary malignant neoplasm of two or more contiguous sites of rectum, anus and anal canal