Malignant neoplasm of rectum (C20) ICD-10-CM
The C20 code range covers malignant neoplasm of rectum with 1 ICD-10-CM diagnosis codes. 1 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
- Malignant neoplasm of rectal ampulla
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- malignant carcinoid tumor of the rectum C7A.026
Codes in the C20 Range 1 codes · 1 billable
- C20 Malignant neoplasm of rectum
About the C20 Code Range
The ICD-10 code C20 is used specifically for identifying a malignant neoplasm of the rectum, commonly referred to as rectal cancer. This code is critical for classifying cancers originating in the rectal area.
This code covers several types of rectal cancer, including adenocarcinoma of the rectum, primary squamous cell carcinoma of the rectum, and rarer forms like leiomyosarcoma and malignant melanoma of the rectum. It also includes terms such as anorectal adenocarcinoma, carcinoma of upper rectum, and overlapping malignant neoplasms of colon and rectum. By recognizing these synonyms and related diagnoses, medical coders can accurately assign the ICD-10 code for malignant neoplasm of the rectum (C20), ensuring proper classification and reporting of gastrointestinal cancers, particularly those affecting the colorectal region.
Questions About This Page
How many billable codes are in the C20 range?
Of the 1 codes in this range, 1 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the C20 range classify?
The range classifies malignant neoplasm of rectum. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
