C20

ICD-10Billable

Malignant neoplasm of rectum

Official ICD-10-CM descriptor (FY2026)

Malignant neoplasm of rectum

C20 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

  • Malignant neoplasm of rectal ampulla

Excludes1

Not coded here. An Excludes1 code should never be reported at the same time as the code above it.

  • malignant carcinoid tumor of the rectum (C7A.026)

Where this code sits

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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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