C21.8
Billable codeMalignant neoplasm of overlapping sites of rectum, anus and anal canal
The ICD-10 code for malignant neoplasm of overlapping sites of rectum, anus and anal canal is C21.8.
Clinical notes
Also known as
Alternate wording, synonyms, or specific conditions that fall under this code, listed to help confirm you've picked the right one.
- Malignant neoplasm of anorectal junction
- Malignant neoplasm of anorectum
- Primary malignant neoplasm of two or more contiguous sites of rectum, anus and anal canal
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- C21.0Malignant neoplasm of anus, unspecified
- C21.1Malignant neoplasm of anal canal
- C21.2Malignant neoplasm of cloacogenic zone
- C21.8Malignant neoplasm of overlapping sites of rectum, anus and anal canal
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 1548Approximate match
Associated MS-DRGs
C21.8 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.