2022 ICD-10-CM Code C21.8

Malignant neoplasm of overlapping sites of rectum, anus and anal canal

Version 2021

Valid for Submission

ICD-10:C21.8
Short Description:Malig neoplasm of ovrlp sites of rectum, anus and anal canal
Long Description:Malignant neoplasm of overlapping sites of rectum, anus and anal canal

Code Classification

  • Neoplasms (C00–D48)
    • Malignant neoplasms of digestive organs (C15-C26)
      • Malignant neoplasm of anus and anal canal (C21)

C21.8 is a billable diagnosis code used to specify a medical diagnosis of malignant neoplasm of overlapping sites of rectum, anus and anal canal. The code C21.8 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 C21.8 might also be used to specify conditions or terms like anorectal adenocarcinoma, malignant neoplasm of anorectum, malignant tumor of anorectal junction or overlapping malignant neoplasm of rectum, anus and anal canal.

The following anatomical sites found in the Table of Neoplasms apply to this code given the correct histological behavior: anorectum, anorectal (junction) ; anus, anal overlapping lesion with rectosigmoid junction or rectum ; crypt of Morgagni ; junction ; junction anorectal ; rectosigmoid (junction) overlapping lesion with anus or rectum ; rectum (ampulla) overlapping lesion with anus or rectosigmoid junction ; etc

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 the code C21.8:


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.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

Convert C21.8 to ICD-9 Code

The General Equivalency Mapping (GEM) crosswalk indicates an approximate mapping between the ICD-10 code C21.8 its ICD-9 equivalent. The approximate mapping means there is not an exact match between the ICD-10 code and the ICD-9 code and the mapped code is not a precise representation of the original code.

Table of Neoplasms

The code C21.8 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
»anorectum, anorectal (junction)
C21.8C78.5D01.3D12.9D37.8D49.0
»anus, anal
  »overlapping lesion with rectosigmoid junction or rectum
C21.8
»crypt of Morgagni
C21.8C78.5D01.3D12.9D37.8D49.0
»junction
C21.8C78.5D01.3D12.9D37.8D49.0
»junction
  »anorectal
C21.8C78.5D01.3D12.9D37.8D49.0
»rectosigmoid (junction)
  »overlapping lesion with anus or rectum
C21.8
»rectum (ampulla)
  »overlapping lesion with anus or rectosigmoid junction
C21.8

Information for Patients


Anal Cancer

The anus is where stool leaves your body when you go to the bathroom. It is made up of your outer layers of skin and the end of your large intestine. Anal cancer is a disease in which cancer cells form in the tissues of the anus.

Anal cancer is rare. It is more common in smokers and people over 50. You are also at higher risk if you have HPV, have anal sex, or have many sexual partners.

Symptoms include bleeding, pain, or lumps in the anal area. Anal itching and discharge can also be signs of anal cancer.

Doctors use tests that examine the anus to diagnose anal cancer. They include a physical exam, endoscopy, ultrasound, and biopsy.

Treatments include radiation therapy, chemotherapy, and surgery.

NIH: National Cancer Institute


[Learn More in MedlinePlus]

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

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]

Code History

  • 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)