Malignant neoplasm of ovrlp sites of right female breast

This code signifies a cancerous tumor involving multiple contiguous sites within the right female breast, where the origin cannot be definitively assigned to a single anatomical subsite. This typically occurs when a single lesion spans across boundaries of two or more breast quadrants, or extends from a quadrant into the central portion of the breast.

Apply this code when documentation specifies a malignant neoplasm of the right breast that involves overlapping anatomical sites, such as a tumor extending from the upper-outer quadrant into the central portion. The medical record should clearly indicate the involvement of multiple, non-discrete breast regions on the right side.

• Ensure the documentation explicitly states "overlapping sites" or describes a tumor spanning multiple contiguous breast regions.
• Do not use this code if the tumor is clearly confined to a single breast quadrant or subsite; instead, use the specific C50.x11 code for that site.
• Confirm laterality (right breast) is clearly documented.