Malignant neoplasm of lower gum

This code signifies a primary cancerous tumor originating in the gingival tissue of the mandible. It refers specifically to the lower gum, distinguishing it from neoplasms of the upper gum or other oral cavity sites. This malignancy involves uncontrolled growth of abnormal cells within the lower gingiva.

Apply this code when documentation clearly indicates a primary malignant neoplasm affecting the lower gum. This typically includes biopsy results confirming malignancy, surgical pathology reports, or physician notes detailing a diagnosis of lower gingival carcinoma. Use for initial diagnosis and subsequent treatment of this specific cancer.

• Differentiate carefully between upper (maxillary) and lower (mandibular) gum involvement; laterality is crucial.
• Ensure documentation specifies "malignant" and not benign or uncertain behavior.
• Do not use for secondary metastatic lesions to the lower gum; use codes for secondary malignancy and the primary site.