Malignant neoplasm of frontal sinus

This code signifies the presence of a cancerous tumor originating within the frontal sinus, one of the paranasal sinuses located in the forehead. It represents a primary malignancy, meaning the cancer started in this specific anatomical site rather than spreading from another location.

Apply this code when documentation clearly states a primary malignant neoplasm of the frontal sinus. This diagnosis is typically established through biopsy and confirmed by pathology reports, often following imaging studies like CT or MRI that identify a mass in the frontal sinus.

• Ensure documentation specifies "primary" malignancy; if metastatic, a secondary site code would be appropriate.
• Confirm the specific sinus involved; do not use for malignancies of other paranasal sinuses (e.g., maxillary, ethmoid, sphenoid).
• Always review pathology reports for definitive diagnosis and laterality if specified.