C18.9 - Malignant neoplasm of colon, unspecified
| ICD-10: | C18.9 |
| Short Description: | Malignant neoplasm of colon, unspecified |
| Long Description: | Malignant neoplasm of colon, unspecified |
| Status: | Valid for Submission |
| Version: | ICD-10-CM 2023 |
| Code Classification: |
C18.9 is a billable ICD-10 code used to specify a medical diagnosis of malignant neoplasm of colon, unspecified. The code is valid during the fiscal year 2023 from October 01, 2022 through September 30, 2023 for the submission of HIPAA-covered transactions.
The following anatomical sites found in the Table of Neoplasms reference this diagnosis code given the correct histological behavior: Neoplasm, neoplastic colon [See Also: Neoplasm, intestine, large] or Neoplasm, neoplastic intestine, intestinal large or Neoplasm, neoplastic intestine, intestinal large colon .
Unspecified diagnosis codes like C18.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.
Approximate Synonyms
The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:
- Adenocarcinoma of large intestine
- Carcinoma of colon
- Carcinoma of colon, stage I
- Carcinoma of colon, stage II
- Carcinoma of colon, stage III
- Carcinoma of colon, stage IV
- HNPCC - hereditary nonpolyposis colon cancer
- Leiomyosarcoma of colon
- Local recurrence of malignant tumor of colon
- Lymphoma of colon
- Malignant tumor of colon
- Malignant tumor of large intestine
- Metastasis from malignant tumor of colon
- Neoplasm of colon distant metastasis staging category M0: No distant metastasis
- Neoplasm of colon distant metastasis staging category M1: Distant metastasis
- Neoplasm of colon distant metastasis staging category M1a: Metastasis confine to one organ or site
- Neoplasm of colon distant metastasis staging category M1b: Metastasis in more than one organ or site or peritoneum
- Neoplasm of colon distant metastasis staging category N0: No regional lymph node metastasis
- Neoplasm of colon primary tumor staging category T1: Tumor invades submucosa
- Neoplasm of colon primary tumor staging category T2: Tumor invades muscularis propria
- Neoplasm of colon primary tumor staging category T3: Tumor invades through muscularis propria into pericolorectal tissues
- Neoplasm of colon primary tumor staging category T4a: Tumor penetrates to surface of visceral peritoneum
- Neoplasm of colon primary tumor staging category T4b: Tumor directly invades or is adherent to other organ or structure
- Neoplasm of colon primary tumor staging category TX: Primary tumor cannot be assessed
- Neoplasm of colon regional lymph node staging category N1: Metastasis in 1-3 regional lymph nodes
- Neoplasm of colon regional lymph node staging category N1b: Metastasis in 2-3 regional lymph nodes
- Neoplasm of colon regional lymph node staging category N1c: Tumor deposit in subserosa, mesentery, or nonperitonealized pericolic or perirectal tissues without regional nodal metastasis
- Neoplasm of colon regional lymph node staging category N2: Metastasis in 4 or more regional lymph nodes
- Neoplasm of colon regional lymph node staging category N2a: Metastasis in 4-6 regional lymph nodes
- Neoplasm of colon regional lymph node staging category N2b: Metastasis in 7 or more regional lymph nodes
- Neoplasm of colon regional lymph node staging category NX: regional lymph nodes cannot be assessed
- pN1: Metastasis in 1 to 3 regional lymph nodes
- pN2: Metastasis in 4 or more regional lymph nodes
- Primary adenocarcinoma of colon
- Primary malignant neoplasm of colon
- Primary malignant neoplasm of large intestine
- pT1: Tumor invades submucosa
- pT2: Tumor invades muscularis propria
- pT3: Tumor invades through the muscularis propria into the subserosa or into non-peritonealized pericolic or perirectal tissues
- pT3a,b category
- pT3a,b: Tumor invades through the muscularis propria into the subserosa or into non-peritonealized pericolic or perirectal tissues, invades 5 mm or less beyond the border of the muscularis propria
- pT3c,d category
- pT3c,d: Tumor invades through the muscularis propria into the subserosa or into non-peritonealized pericolic or perirectal tissues, invades greater than 5 mm beyond the border of the muscularis propria
- pT4: Tumor directly invades other organs or structures and/or perforates visceral peritoneum
- Squamous cell carcinoma of colon
- T1: Tumor invades submucosa
- T3: Colon/rectum tumor invades through the muscularis propria into the subserosa or the nonperitonealized pericolic or perirectal soft tissues
- T3c,d: Colon/rectum tumor invades >5 mm beyond the border of the muscularis propria
- T4a: Colon/rectum tumor directly invades other organs or structures
- T4b: Colon/rectum tumor penetrates the visceral peritoneum
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 this diagnosis code:
Inclusion Terms
Inclusion TermsThese 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 large intestine NOS
Index to Diseases and Injuries References
The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for this diagnosis code are found in the injuries and diseases index:
- - Adenocarcinoma - See Also: Neoplasm, malignant, by site;
- - in
- - adenomatous
- - polyposis coli - C18.9
- - adenomatous
- - in
- - Carcinoma (malignant) - See Also: Neoplasm, by site, malignant;
- - in
- - adenomatous
- - polyposis coli - C18.9
- - adenomatous
- - in
- - Polyposis - See Also: Polyp;
- - coli (adenomatous) - D12.6
- - adenocarcinoma in - C18.9
- - carcinoma in - C18.9
- - coli (adenomatous) - D12.6
Convert to ICD-9 Code
| Source ICD-10 Code | Target ICD-9 Code | |
|---|---|---|
| C18.9 | 153.9 - Malignant neo colon NOS |
Table of Neoplasms
This code is referenced 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.
| Neoplasm, neoplastic | Malignant Primary |
Malignant Secondary |
CaInSitu | Benign | Uncertain Behavior |
Unspecified Behavior |
|---|---|---|---|---|---|---|
| »Neoplasm, neoplastic »colon [See Also: Neoplasm, intestine, large] | C18.9 | C78.5 | ||||
| »Neoplasm, neoplastic »intestine, intestinal »large | C18.9 | C78.5 | D01.0 | D12.6 | D37.4 | D49.0 |
| »Neoplasm, neoplastic »intestine, intestinal »large »colon | C18.9 | C78.5 | D01.0 | D12.6 | D37.4 | D49.0 |
Patient Education
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:
- 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
[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 2023 - No Change, effective from 10/1/2022 through 9/30/2023
- FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
- 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)