Malignant neoplasm of overlapping sites of larynx

This code signifies a primary cancerous tumor that spans across two or more contiguous anatomical sub-sites within the larynx, making it impossible to assign to a single specific laryngeal sub-site. This includes malignancies affecting areas such as the glottis, supraglottis, and subglottis simultaneously.

This code is appropriate when documentation clearly indicates a laryngeal malignancy that has spread across or originated in multiple adjacent laryngeal regions. It should be used when the physician's assessment explicitly states the overlapping nature of the tumor's involvement within the larynx, precluding a more specific site assignment.

• Ensure physician documentation explicitly states "overlapping sites" or describes involvement of multiple contiguous laryngeal sub-sites.
• Do not use this code if the tumor is confined to a single laryngeal sub-site (e.g., glottis, supraglottis, subglottis); use the more specific code for that site.
• Sequence this code as the primary diagnosis when it represents the reason for the encounter or treatment.