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
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.
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.