Malignant neoplasm of overlapping sites of right male breast

This code signifies a cancerous tumor involving multiple contiguous sites within the right male breast, where the origin cannot be assigned to a single specific anatomical site. This typically involves the tumor spanning across different quadrants or extending from one quadrant into another without a clear primary focus in one distinct area.

Use this code when documentation explicitly states a malignant neoplasm affecting overlapping or contiguous sites of the right male breast. This applies when the physician's assessment indicates the tumor crosses boundaries of defined breast regions, such as involving both the upper-outer and lower-outer quadrants, or extending from the central portion into an adjacent quadrant.

• Ensure documentation clearly specifies "overlapping sites" or similar language indicating involvement of multiple contiguous areas, not just a large tumor within one site.
• Distinguish from codes for specific quadrants (e.g., C50.421) or central portion (C50.121) when the tumor is confined to a single anatomical region.
• Always sequence this code as the primary diagnosis when it represents the reason for the encounter, followed by any relevant secondary diagnoses.