Malignant neoplasm of overlapping sites of bladder

This code signifies a primary malignant tumor that originates in and spans across two or more contiguous or overlapping anatomical sites within the bladder. This indicates the tumor's boundaries are not confined to a single, distinct region of the bladder.

This code is appropriate when documentation specifies a bladder malignancy involving multiple adjacent sites, such as a tumor extending from the trigone to the lateral wall, or from the dome to the anterior wall. The physician's operative report, pathology report, or imaging studies should clearly indicate the involvement of overlapping bladder regions.

• Do not use this code if the malignancy is clearly confined to a single, specified bladder site (e.g., trigone, dome, lateral wall).
• Ensure the documentation explicitly states "overlapping sites" or describes the tumor's extension across multiple contiguous bladder regions.
• Sequence this code as the primary diagnosis when the bladder malignancy is the reason for the encounter.