ICD-10 Diagnosis Code C18.1

Malignant neoplasm of appendix

Diagnosis Code C18.1

ICD-10: C18.1
Short Description: Malignant neoplasm of appendix
Long Description: Malignant neoplasm of appendix
This is the 2019 version of the ICD-10-CM diagnosis code C18.1

Valid for Submission
The code C18.1 is valid for submission for HIPAA-covered transactions.

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

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code C18.1 is grouped in the following Diagnostic Related Group(s) (MS-DRG V35.0)

  • 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 to ICD-9
  • 153.5 - Malignant neo appendix

Synonyms
  • 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

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

Also called: Colon cancer, Rectal 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

  • Abdominal radiation - discharge (Medical Encyclopedia)
  • After chemotherapy - discharge (Medical Encyclopedia)
  • Colon cancer (Medical Encyclopedia)
  • Colon cancer screening (Medical Encyclopedia)
  • Large bowel resection (Medical Encyclopedia)
  • Lower GI Series - NIH (National Institute of Diabetes and Digestive and Kidney Diseases)
  • Understanding Chemotherapy - NIH - Easy-to-Read (National Cancer Institute)
  • What to Know about External Beam Radiation Therapy - NIH - Easy-to-Read (National Cancer Institute)

[Read More]

ICD-10 Footnotes

General Equivalence Map Definitions
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Approximate Flag - The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
  • No Map Flag - The no map flag indicates that a code in the source system is not linked to any code in the target system.
  • Combination Flag - The combination flag indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system.

Present on Admission
The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement.

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