C21.0

Approximate Synonyms

• Cancer anal melanoma

• Cancer of the anus

• Cancer of the anus, adenocarcinoma

• Cancer of the anus, squamous cell

• Malignant melanoma of anus

• Primary adenocarcinoma of anus

• Primary malignant neoplasm of anus

• Squamous cell carcinoma of anal margin

Clinical Information

• A primary or metastatic malignant neoplasm that affects the anal canal or perianal skin. Representative examples include carcinomas, lymphomas, and melanomas.

• Cancer relating to the anus. Tumors of the anal margin below the anal verge and involving the perianal hair-bearing skin) are classified with skin tumors.

Details

• C21.0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.

• The 2023 edition of ICD-10-CM C21.0 became effective on October 1, 2022.

• This is the American ICD-10-CM version of C21.0 – other international versions of ICD-10 C21.0 may differ.