Malignant neoplasm of ovrlp sites of left bronchus and lung

This code signifies a cancerous tumor that spans across multiple contiguous anatomical subdivisions within the left bronchus and lung, making it impossible to assign to a single, more specific site. This indicates a primary malignancy originating in the left lung or bronchus that has grown to involve adjacent structures.

Apply this code when documentation clearly states a primary malignant neoplasm of the left lung or bronchus that involves overlapping sites, such as the main bronchus and an adjacent lobe, or multiple lobes without a clear single point of origin. This is appropriate when the tumor's extent prevents more precise localization within the left lung.

• Ensure the documentation explicitly states "overlapping sites" or describes involvement of multiple contiguous left bronchopulmonary segments.
• Do not use this code if the malignancy is clearly confined to a single lobe or bronchus; instead, use a more specific C34.xx code.
• Confirm the laterality is definitively "left" as specified in the code description.