C21 Malignant neoplasm of anus and anal canal

Non-billable header with 4 child codes.

Excludes2 (not included here)

• 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)

Applies from C21 Malignant neoplasm of anus and anal canal

Excludes2 (not included here)

• 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)

Codes under C21

• C21.0 Malignant neoplasm of anus, unspecified
• C21.1 Malignant neoplasm of anal canal
• C21.2 Malignant neoplasm of cloacogenic zone
• C21.8 Malignant neoplasm of overlapping sites of rectum, anus and anal canal

Nearby codes

• C21 Malignant neoplasm of anus and anal canal (this code)
• C21.0 Malignant neoplasm of anus, unspecified
• C21.1 Malignant neoplasm of anal canal
• C21.2 Malignant neoplasm of cloacogenic zone
• C21.8 Malignant neoplasm of overlapping sites of rectum, anus and anal canal