Squamous cell carcinoma of skin of breast

This code identifies a malignant neoplasm originating from the squamous cells of the epidermis, specifically located on the skin covering the breast. It represents a type of non-melanoma skin cancer affecting this particular anatomical site.

Apply this code when documentation confirms a biopsy-proven squamous cell carcinoma of the skin of the breast. It is appropriate for primary diagnoses of this specific malignancy, distinguishing it from other skin cancers or breast tissue malignancies.

• Differentiate from squamous cell carcinoma of the underlying breast tissue (C50.-), which is a primary breast cancer.
• Ensure the documentation explicitly states "skin of breast" to support this code, rather than just "breast."
• Code any associated metastatic disease separately, if applicable.