Malig neoplm of ovrlp sites of lip, oral cavity and pharynx

This code signifies a malignant tumor that spans across two or more distinct anatomical sub-sites within the lip, oral cavity, or pharynx, where the point of origin cannot be definitively assigned to a single site. It indicates a primary malignant neoplasm affecting multiple contiguous or overlapping regions within this complex anatomical area.

Use this code when documentation clearly indicates a primary malignant neoplasm involving overlapping sites of the lip, oral cavity, or pharynx, and the specific origin cannot be isolated to one sub-site. This is often seen in advanced tumors that have spread locally across boundaries. Documentation should explicitly state involvement of multiple, contiguous sites without a clear primary focus.

• Do not use this code if the primary site can be identified, even if there is local extension.
• Carefully review documentation to ensure the neoplasm truly overlaps sites rather than being a single site with metastasis.
• Remember the Excludes1 note for 'book leaf' neoplasm of the ventral surface of the tongue and floor of mouth, which has a specific code (C06.89).