Category C21

Malignant neoplasm of anus and anal canal

Clinical Classification Guidelines

Specific Diagnosis Codes

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