ICD-10-CM Code C18.1

Malignant neoplasm of appendix

Version 2020 Billable Code Neoplasm Malignant Primary

Valid for Submission

C18.1 is a billable code used to specify a medical diagnosis of malignant neoplasm of appendix. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code C18.1 might also be used to specify conditions or terms like adenocarcinoma of appendix, carcinoma of appendix, malignant tumor of appendix, mucinous adenocarcinoma of gastrointestinal tract, primary malignant neoplasm of appendix, primary mucinous adenocarcinoma of appendix, etc

ICD-10:C18.1
Short Description:Malignant neoplasm of appendix
Long Description:Malignant neoplasm of appendix

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 C18.1 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 appendix
  • Carcinoma of appendix
  • Malignant tumor of appendix
  • Mucinous adenocarcinoma of gastrointestinal tract
  • Primary malignant neoplasm of appendix
  • Primary mucinous adenocarcinoma of appendix
  • Primary mucinous carcinoma of digestive organ
  • pT1: Tumor invades submucosa
  • pT2: Tumor invades muscularis propria
  • pT3: Tumor invades through the muscularis propria into the subserosa or into mesoappendix
  • pT4: Tumor directly invades other organs or structures and/or perforates visceral peritoneum

Diagnostic Related Groups

The ICD-10 code C18.1 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.

  • 338 - APPENDECTOMY WITH COMPLICATED PRINCIPAL DIAGNOSIS WITH MCC
  • 339 - APPENDECTOMY WITH COMPLICATED PRINCIPAL DIAGNOSIS WITH CC
  • 340 - APPENDECTOMY WITH COMPLICATED PRINCIPAL DIAGNOSIS WITHOUT CC/MCC

Convert C18.1 to ICD-9

  • 153.5 - Malignant neo appendix

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 C18.1 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
Primary
Malignant
Secondary
CaInSitu Benign Uncertain
Behavior
Unspecified
Behavior
»appendix
C18.1C78.5D01.0D12.1D37.3D49.0
»intestine, intestinal
  »large
    »appendix
C18.1C78.5D01.0D12.1D37.3D49.0

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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