ICD-10 Diagnosis Code C20

Malignant neoplasm of rectum

Diagnosis Code C20

ICD-10: C20
Short Description: Malignant neoplasm of rectum
Long Description: Malignant neoplasm of rectum
This is the 2018 version of the ICD-10-CM diagnosis code C20

Valid for Submission
The code C20 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Neoplasms (C00–D48)
    • Malignant neoplasms of digestive organs (C15-C26)
      • Malignant neoplasm of rectum (C20)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code C20 is grouped in the following Diagnostic Related Group(s) (MS-DRG V34.0)


Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.
  • 154.1 - Malignant neopl rectum

  • Adenocarcinoma of anorectum
  • Adenocarcinoma of large intestine
  • Adenocarcinoma of rectum
  • Local recurrence of malignant tumor of rectum
  • Malignant epithelial neoplasm of upper rectum
  • Malignant melanoma of rectum
  • Malignant tumor of rectum
  • Metastasis from malignant tumor of rectum
  • Overlapping malignant neoplasm of colon
  • Overlapping malignant neoplasm of colon and rectum
  • Overlapping malignant neoplasm of gastrointestinal tract
  • Primary malignant neoplasm of rectum
  • Primary malignant neoplasm of rectum
  • Primary malignant neuroendocrine neoplasm of large intestine
  • Primary malignant neuroendocrine neoplasm of rectum

Index of Diseases and Injuries
References found for the code C20 in the Index of Diseases and Injuries:

Table of Neoplasms

The code C20 is included in the table of neoplasms by anatomical site. For each site there are six possible code numbers according to whether the neoplasm in question is malignant, benign, in situ, of uncertain behavior, or of unspecified nature. The description of the neoplasm will often indicate which of the six columns is appropriate.

Where such descriptors are not present, the remainder of the Index should be consulted where guidance is given to the appropriate column for each morphological (histological) variety listed. However, the guidance in the Index can be overridden if one of the descriptors mentioned above is present.

The Tabular must be reviewed for the complete diagnosis code.

Neoplasm, neoplastic Malignant
CaInSitu Benign Uncertain
»rectum (ampulla)

Information for Patients

Colorectal Cancer

Also called: Colon cancer, Rectal cancer

The colon and rectum are part of the large intestine. Colorectal cancer occurs when tumors form in the lining of the large intestine. It is common in both men and women. The risk of developing colorectal cancer rises after age 50. You're also more likely to get it if you have colorectal polyps, a family history of colorectal cancer, ulcerative colitis or Crohn's disease, eat a diet high in fat, or smoke.

Symptoms of colorectal cancer include

  • Diarrhea or constipation
  • A feeling that your bowel does not empty completely
  • Blood (either bright red or very dark) in your stool
  • Stools that are narrower than usual
  • Frequent gas pains or cramps, or feeling full or bloated
  • Weight loss with no known reason
  • Fatigue
  • Nausea or vomiting

Because you may not have symptoms at first, it's important to have screening tests. Everyone over 50 should get screened. Tests include colonoscopy and tests for blood in the stool. Treatments for colorectal cancer include surgery, chemotherapy, radiation, or a combination. Surgery can usually cure it when it is found early.

NIH: National Cancer Institute

  • Abdominal radiation - discharge (Medical Encyclopedia)
  • After chemotherapy - discharge (Medical Encyclopedia)
  • Colon cancer (Medical Encyclopedia)
  • Colon cancer screening (Medical Encyclopedia)
  • Large bowel resection (Medical Encyclopedia)
  • Lower GI Series - NIH (National Institute of Diabetes and Digestive and Kidney Diseases)
  • Understanding Chemotherapy - NIH - Easy-to-Read (National Cancer Institute)
  • What to Know about External Beam Radiation Therapy - NIH - Easy-to-Read (National Cancer Institute)

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