Malignant neoplasm of overlapping sites of corpus uteri

This code signifies a cancerous tumor that originates in the main body of the uterus (corpus uteri) and extends across or involves two or more contiguous anatomical sub-sites within the corpus uteri, making it impossible to precisely assign to a single sub-site. This includes malignancies that span the fundus, body, and/or isthmus of the uterus.

Apply this code when documentation clearly indicates a primary malignant neoplasm of the uterine corpus that involves multiple overlapping sub-sites, such as a tumor extending from the fundus into the body. Pathological reports and operative notes describing the tumor's extent across contiguous regions of the corpus uteri are essential for accurate assignment.

• Do not use this code if the tumor is confined to a single, definable sub-site within the corpus uteri (e.g., fundus, body, or isthmus).
• Ensure documentation explicitly states "overlapping" or "contiguous" involvement of multiple corpus uteri sub-sites.
• Distinguish from neoplasms of the cervix uteri (C53.-) or uterus, part unspecified (C55).