Malignant neoplasm of anterior portion of floor of mouth

This code identifies a cancerous growth originating in the front part of the floor of the mouth, the area beneath the tongue and behind the lower front teeth. This malignancy typically involves squamous cell carcinoma, the most common type of oral cancer.

Apply this code when documentation clearly indicates a primary malignant neoplasm located specifically in the anterior floor of the mouth. Supporting documentation should include pathology reports confirming malignancy and precise anatomical location, as well as physician notes detailing the tumor site.

• Differentiate carefully from malignancies of the posterior floor of the mouth or other oral cavity sites.
• Ensure the pathology report confirms malignancy; do not use for benign or uncertain neoplasms.
• Sequence this code as the primary diagnosis when it is the reason for the encounter, followed by any relevant secondary diagnoses.