Other specified malignant neoplasm of skin of breast

This code signifies a malignant tumor of the skin covering the breast, which is not a melanoma, basal cell carcinoma, or squamous cell carcinoma. It encompasses rare or less common types of skin cancers originating on the breast's external surface.

Apply this code when documentation specifies a malignant neoplasm of the breast skin that doesn't fit into the categories of basal cell, squamous cell, or melanoma. This includes diagnoses such as Merkel cell carcinoma, sebaceous carcinoma, or atypical fibroxanthoma of the breast skin. The pathology report should clearly identify the specific type of non-melanoma, non-basal, non-squamous skin cancer.

• Ensure the pathology report explicitly states the type of skin cancer and its location on the breast.
• Do not use this code for malignant neoplasms of the breast tissue itself; this code is specifically for the skin of the breast.
• Distinguish carefully between this code and codes for melanoma (C43.5x), basal cell carcinoma (C44.51x), or squamous cell carcinoma (C44.52x) of the breast skin.