Malignant neoplasm of lateral floor of mouth

This code identifies a primary cancerous tumor originating in the lateral floor of the mouth. This area encompasses the tissue between the mandible and the tongue, extending laterally towards the alveolar ridge. The malignancy is characterized by uncontrolled cell growth with the potential for local invasion and metastasis.

Assign this code when documentation explicitly states a malignant neoplasm of the lateral floor of the mouth. This typically occurs following a biopsy confirming malignancy and specifying the exact anatomical location. Use this code for primary tumors, not for metastatic lesions to this site.

• Differentiate from other oral cavity sites; ensure documentation specifies "lateral floor of mouth" and not just "floor of mouth" or "oral cavity, unspecified."
• Always sequence this code as the primary diagnosis when it is the reason for the encounter, unless specific coding guidelines dictate otherwise (e.g., for prophylactic organ removal).
• Confirm laterality if specified in the documentation, although this particular code does not differentiate left/right.