Category · FY2027
C21 Malignant neoplasm of anus and anal canal
- Header · not billable
C21 is not billable. The category heads 4 billable codes in FY2027: the 4 codes directly below it.
Index → code
Where it sits
- Chapter 2 Neoplasms (C00-D49)
- C15-C26 Malignant neoplasms of digestive organs (C15-C26)
- C21 Malignant neoplasm of anus and anal canal
- Billable codes
- 4
- Subdivisions
- 4
- CC / MCC codes
- 4 / 0
- HCC V28 codes
- 4
- New FY2027
- 0
- Index entries
- 2
Codes in C21
- C21.0Malignant neoplasm of anus, unspecifiedBillableCC22
- C21.1Malignant neoplasm of anal canalBillableCC22
Inclusion terms 1
Inclusion terms
- Malignant neoplasm of anal sphincter
- C21.2Malignant neoplasm of cloacogenic zoneBillableCC22
- C21.8Malignant neoplasm of overlapping sites of rectum, anus and anal canalBillableCC22
Inclusion terms 3
Inclusion terms
- Malignant neoplasm of anorectal junction
- Malignant neoplasm of anorectum
- Primary malignant neoplasm of two or more contiguous sites of rectum, anus and anal canal
CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).
Instructions
At C21
Excludes2
- malignant carcinoid tumors of the colon (C7A.02-) C7A.02
- malignant melanoma of anal margin (C43.51) C43.51
- malignant melanoma of anal skin (C43.51) C43.51
- malignant melanoma of perianal skin (C43.51) C43.51
- other and unspecified malignant neoplasm of anal margin (C44.500, C44.510, C44.520, C44.590) C44.500 C44.510 C44.520 C44.590
- other and unspecified malignant neoplasm of anal skin (C44.500, C44.510, C44.520, C44.590) C44.500 C44.510 C44.520 C44.590
- other and unspecified malignant neoplasm of perianal skin (C44.500, C44.510, C44.520, C44.590) C44.500 C44.510 C44.520 C44.590
Notes that also apply
Block C15-C26 instructions (Excludes1 1, Excludes2 1): printed on the block page.
Chapter 2 instructions (Notes 8): printed on the chapter 2 page.
Index entries
NCHS Alphabetic Index. Index first, then the Tabular List.