Malignant neoplasm of maxillary sinus

This code signifies a primary cancerous tumor originating within the mucosal lining of the maxillary sinus, which is the largest paranasal sinus located in the cheekbones. This malignancy is an aggressive form of head and neck cancer that can invade surrounding structures.

Apply this code when documentation confirms a primary malignant neoplasm specifically located in the maxillary sinus. This typically follows a biopsy and pathological confirmation of malignancy. Use this code for initial diagnosis and subsequent encounters related to the primary tumor.

• Ensure the documentation clearly specifies "maxillary sinus" and not another paranasal sinus.
• Distinguish from secondary malignancies or metastatic disease to the maxillary sinus, which would require different codes.
• Code laterality (right, left, bilateral) if specified in the clinical record, using appropriate sub-codes.