C21.0
Malignant neoplasm of anus, unspecified
- Release
- FY 2027
- Effective
Hierarchy
Where C21.0 sits in the official hierarchy. Each level is the code it is classified under.
- C21 Parent Malignant neoplasm of anus and anal canal
- C21.0 This code Malignant neoplasm of anus, unspecified
Official Coding Notes
Reproduced verbatim from the FY 2027 ICD-10-CM files. Notes labelled as inherited are declared on a parent code and apply here too.
Excludes2
malignant carcinoid tumors of the colon ( C7A.02- )
Inherited from C21 — Malignant neoplasm of anus and anal canal
Excludes2
malignant melanoma of anal margin ( C43.51 )
Inherited from C21 — Malignant neoplasm of anus and anal canal
Excludes2
malignant melanoma of anal skin ( C43.51 )
Inherited from C21 — Malignant neoplasm of anus and anal canal
Excludes2
malignant melanoma of perianal skin ( C43.51 )
Inherited from C21 — Malignant neoplasm of anus and anal canal
Excludes2
other and unspecified malignant neoplasm of anal margin ( C44.500 , C44.510 , C44.520 , C44.590 )
Inherited from C21 — Malignant neoplasm of anus and anal canal
Version History
How C21.0 appears in each release imported from the official files, newest first.
-
FY 2027 Effective
CurrentMalignant neoplasm of anus, unspecified
-
FY 2026 Effective
UnchangedMalignant neoplasm of anus, unspecified
Related Codes
Other codes under C21
Codes whose official notes reference C21.0
Data Source
Code information on this page is derived from the FY 2027 ICD-10-CM files published by CDC NCHS and CMS.
- Release
- FY 2027
- Effective
- Source file
- icd10cm-code-descriptions-2027.zip
Official ICD-10-CM source files (opens in a new tab)
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