Malignant neoplasm of overlapping sites of vulva

This code signifies a primary cancerous tumor that originates in the vulva and extends across or involves multiple distinct anatomical sub-sites of the vulva, making it impossible to assign to a single specific sub-site. This includes malignancies that span areas such as the labia majora, labia minora, clitoris, or vestibule.

Use this code when medical record documentation clearly indicates a primary malignant neoplasm of the vulva that involves two or more contiguous or overlapping sub-sites. This is appropriate when the tumor's origin cannot be localized to a single specific vulvar region.

• Only use this code when the documentation explicitly states "overlapping sites" or describes a tumor spanning multiple vulvar sub-sites.
• Avoid using this code if the tumor is clearly confined to a single specific vulvar sub-site (e.g., labium majus, clitoris), even if large.
• Always sequence this code as the primary diagnosis when it represents the reason for the encounter or treatment.