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  2. ICD-10-CM Codes List
  3. C00–D49
  4. C15-C26
  5. Malignant neoplasm of rectum (C20)

Malignant neoplasm of rectum (C20)

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.

Instructional Notations

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