Not Valid for Submission
C21 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of malignant neoplasm of anus and anal canal. The code is not specific and is NOT valid for the year 2022 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.
Specific Coding for Malignant neoplasm of anus and anal canal
Non-specific codes like C21 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for malignant neoplasm of anus and anal canal:
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:
Type 2 ExcludesType 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
- malignant carcinoid tumors of the colon C7A.02
- malignant melanoma of anal margin C43.51
- malignant melanoma of anal skin C43.51
- malignant melanoma of perianal skin C43.51
- other and unspecified malignant neoplasm of anal margin C44.500 C44.510 C44.520 C44.590
- other and unspecified malignant neoplasm of anal skin C44.500 C44.510 C44.520 C44.590
- other and unspecified malignant neoplasm of perianal skin C44.500 C44.510 C44.520 C44.590
Information for Patients
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
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