2022 ICD-10-CM Code C18

Malignant neoplasm of colon

Version 2021

Not Valid for Submission

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

Code Classification

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

C18 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of malignant neoplasm of colon. The code is not specific and is NOT valid for the year 2022 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding for Malignant neoplasm of colon

Non-specific codes like C18 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for malignant neoplasm of colon:

  • BILLABLE CODE - Use C18.0 for Malignant neoplasm of cecum
  • BILLABLE CODE - Use C18.1 for Malignant neoplasm of appendix
  • BILLABLE CODE - Use C18.2 for Malignant neoplasm of ascending colon
  • BILLABLE CODE - Use C18.3 for Malignant neoplasm of hepatic flexure
  • BILLABLE CODE - Use C18.4 for Malignant neoplasm of transverse colon
  • BILLABLE CODE - Use C18.5 for Malignant neoplasm of splenic flexure
  • BILLABLE CODE - Use C18.6 for Malignant neoplasm of descending colon
  • BILLABLE CODE - Use C18.7 for Malignant neoplasm of sigmoid colon
  • BILLABLE CODE - Use C18.8 for Malignant neoplasm of overlapping sites of colon
  • BILLABLE CODE - Use C18.9 for Malignant neoplasm of colon, 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 coding notes and 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.

Information for Patients


Colorectal 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

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


[Learn More in MedlinePlus]

Colon Cancer Summary Learn about colon cancer risk factors, symptoms, tests to diagnose, factors affecting prognosis, staging, and treatment.
[Learn More in MedlinePlus]

Code History

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