Malignant neoplasm of unspecified site of left male breast

This code signifies a cancerous tumor originating in the breast tissue of a male patient, specifically located in the left breast, where the exact anatomical site within the breast is not documented. It indicates a primary malignancy rather than a metastatic lesion.

Use this code when documentation confirms a primary malignant neoplasm of the left breast in a male patient, but the specific quadrant or central portion of the breast is not specified. This code is appropriate when the pathology report confirms malignancy but lacks further site detail.

• Ensure the documentation clearly states "left breast" and "male."
• Avoid using this code if a more specific site (e.g., upper-outer quadrant) is documented; instead, use the appropriate subcategory.
• Always sequence this code as the primary diagnosis when it represents the reason for the encounter or treatment.