Valid for Submission
C18.1 is a billable diagnosis code used to specify a medical diagnosis of malignant neoplasm of appendix. The code C18.1 is valid during the fiscal year 2022 from October 01, 2021 through September 30, 2022 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.
The following anatomical sites found in the Table of Neoplasms apply to this code given the correct histological behavior: appendix or intestine, intestinal large 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:
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 - MS-DRG Mapping
|MS-DRG||MS-DRG Title||MCD||Relative Weight|
|338||APPENDECTOMY WITH COMPLICATED PRINCIPAL DIAGNOSIS WITH MCC||06||2.7988|
|339||APPENDECTOMY WITH COMPLICATED PRINCIPAL DIAGNOSIS WITH CC||06||1.695|
|340||APPENDECTOMY WITH COMPLICATED PRINCIPAL DIAGNOSIS WITHOUT CC/MCC||06||1.2284|
The relative weight of a diagnostic related group determines the reimbursement rate based on the severity of a patient's illness and the associated cost of care during hospitalization.
Convert C18.1 to ICD-9 Code
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.
Information for Patients
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
- 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]