Neoplasm of uncertain behavior of lip, oral cavity, and pharynx

This code signifies a tumor originating in the lip, oral cavity, or pharynx where the pathologist cannot definitively determine if it is benign or malignant. These neoplasms exhibit features that are neither clearly benign nor overtly malignant, requiring further investigation or observation.

Apply this code when pathology reports describe a lesion of the lip, oral cavity, or pharynx as "uncertain behavior," "borderline malignancy," or "indeterminate." Documentation must explicitly state the uncertain nature of the neoplasm and its anatomical site within the specified regions.

• Do not use this code if the pathology definitively states benign or malignant; assign the appropriate benign or malignant neoplasm code.
• Ensure the documentation specifies the exact location (e.g., lip, tongue, tonsil) within the oral cavity or pharynx.
• Sequence this code as the primary diagnosis when the uncertain neoplasm is the reason for the encounter.