Malignant neoplasm of lateral portion of floor of mouth

This code identifies a cancerous growth originating in the side areas of the floor of the mouth, the U-shaped region beneath the tongue. This malignancy specifically affects the lateral aspects, distinguishing it from tumors of the central or anterior floor of the mouth.

Apply this code for documented cases of primary malignant neoplasms confirmed to be located in the lateral portion of the floor of the mouth. Supporting documentation should include pathology reports confirming malignancy and precise anatomical location, or physician notes clearly specifying the tumor site.

• Differentiate carefully from malignancies of the anterior or central floor of mouth, or other oral cavity sites.
• Ensure documentation specifies "lateral portion" to avoid miscoding to a more general floor of mouth neoplasm.
• Sequence as the primary diagnosis when this is the reason for the encounter or treatment.