C21.8

ICD-10Billable

Malig neoplasm of ovrlp sites of rectum, anus and anal canal

Official ICD-10-CM descriptor (FY2026)

Malignant neoplasm of overlapping sites of rectum, anus and anal canal

C21.8 is valid for submission on a claim — CMS flags it as a billable, specific code.

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

Related codes in C21

Where this code sits

Parent code
C21

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.

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