Malig neoplm of ovrlp sites of heart, mediastinum and pleura

This code signifies a cancerous tumor that spans across multiple primary sites within the thoracic cavity, specifically involving the heart, mediastinum, and/or pleura. It indicates that the exact origin cannot be localized to a single anatomical structure within these regions.

Apply this code when documentation clearly states a malignant neoplasm affecting overlapping boundaries of the heart, mediastinum, and/or pleura. This is appropriate when the tumor's extent makes it impossible to assign a more specific primary site code within these areas.

• Ensure the physician's documentation explicitly states "overlapping sites" or similar language indicating involvement of multiple, contiguous thoracic structures.
• Do not use this code if a specific primary site (e.g., primary malignant neoplasm of the heart) can be identified, even if there is extension to adjacent areas.
• Always sequence this code as the primary diagnosis when it represents the reason for the encounter, followed by codes for any associated metastases or complications.