ICD-10-CM Code C18

Malignant neoplasm of colon

Version 2021 Non-Billable Code

Not Valid for Submission

C18 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of malignant neoplasm of colon. The code is NOT valid for the year 2021 for the submission of HIPAA-covered transactions.

ICD-10:C18
Short Description:Malignant neoplasm of colon
Long Description:Malignant neoplasm of colon

Consider the following ICD-10 codes with a higher level of specificity:

  • C18.0 - Malignant neoplasm of cecum
  • C18.1 - Malignant neoplasm of appendix
  • C18.2 - Malignant neoplasm of ascending colon
  • C18.3 - Malignant neoplasm of hepatic flexure
  • C18.4 - Malignant neoplasm of transverse colon
  • C18.5 - Malignant neoplasm of splenic flexure
  • C18.6 - Malignant neoplasm of descending colon
  • C18.7 - Malignant neoplasm of sigmoid colon
  • C18.8 - Malignant neoplasm of overlapping sites of colon
  • C18.9 - ... unspecified

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code C18:

Type 1 Excludes

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 tumors of the colon C7A.02

Code Classification

  • Neoplasms (C00–D48)
    • Malignant neoplasms of digestive organs (C15-C26)
      • Malignant neoplasm of colon (C18)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

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)

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