Malignant neoplasm of overlapping sites of stomach

This code signifies a cancerous tumor originating in the stomach that spans across two or more contiguous anatomical sub-sites within the stomach, making it impossible to assign to a single specific sub-site. This includes neoplasms that involve the cardia, fundus, body, antrum, pylorus, or lesser/greater curvature simultaneously.

Use this code when documentation clearly indicates a primary malignant neoplasm of the stomach that has spread across or involves multiple adjacent regions of the stomach. This is typically supported by pathology reports, operative notes, or imaging studies describing the extent and location of the tumor.

• Do not use this code if the tumor's origin can be definitively localized to a single stomach sub-site (e.g., cardia, fundus).
• Ensure the documentation explicitly states "overlapping sites" or describes involvement of multiple contiguous stomach regions.
• Sequence this code as the primary diagnosis when it represents the reason for the encounter, followed by any relevant secondary diagnoses.