C21 - Malignant neoplasm of anus and anal canal

The ICD 10 Code for Malignant neoplasm of anus and anal canal is listed as C21.
Additional information concerning this code and description can be found below including ICD 9 crosswalks / GEMS, chapter information, and DRGs where available.

ICD 10 CM Field	Value
Diagnosis Code:	C21
Description:	Malignant neoplasm of anus and anal canal Excludes2: 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)

Chapter	Neoplasms (C00-D49)
ICD-10-CM Children (deeper level / typically more specific) of 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