ICD-10-CM Code C18.9

Malignant neoplasm of colon, unspecified

Version 2020 Billable Code Neoplasm Malignant Primary

Valid for Submission

C18.9 is a billable code used to specify a medical diagnosis of malignant neoplasm of colon, unspecified. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code C18.9 might also be used to specify conditions or terms like 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, etc

The following anatomical sites found in the Table of Neoplasms apply to this code given the correct histological behavior: colon [See Also: Neoplasm, intestine, large] or intestine, intestinal large or intestine, intestinal large colon .

ICD-10:C18.9
Short Description:Malignant neoplasm of colon, unspecified
Long Description: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 guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code C18.9:

Inclusion Terms

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 large intestine NOS

Index to Diseases and Injuries

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 the code C18.9 are found in the index:


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
  • Local recurrence of malignant tumor of colon
  • Lymphoma of colon
  • Lymphoma of intestine
  • 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

Diagnostic Related Groups

The ICD-10 code C18.9 is grouped in the following groups for version MS-DRG V37.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2020 through 09/30/2020.

  • 374 - DIGESTIVE MALIGNANCY WITH MCC
  • 375 - DIGESTIVE MALIGNANCY WITH CC
  • 376 - DIGESTIVE MALIGNANCY WITHOUT CC/MCC

Convert C18.9 to ICD-9

  • 153.9 - Malignant neo colon NOS

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

Table of Neoplasms

The code C18.9 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.

Neoplasm, neoplastic Malignant
Primary
Malignant
Secondary
CaInSitu Benign Uncertain
Behavior
Unspecified
Behavior
»colon [See Also: Neoplasm, intestine, large]
C18.9C78.5
»intestine, intestinal
  »large
C18.9C78.5D01.0D12.6D37.4D49.0
»intestine, intestinal
  »large
    »colon
C18.9C78.5D01.0D12.6D37.4D49.0

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

  • 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


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