C31.0

HCC Category Mapping

What This Code Means

Cancer that develops in the maxillary sinus, the large air-filled cavity in the cheekbone above the teeth.

Coding Tips

• •Maxillary sinus cancer often presents late; document extent of invasion into adjacent structures
• •Distinguish from other paranasal sinus cancers and ensure correct sinus site is coded

Clinical Significance

Maxillary sinus cancer is the most common paranasal sinus malignancy, often presenting at advanced stages because early symptoms mimic sinusitis. Treatment typically requires radical surgery (maxillectomy) with adjuvant radiation, resulting in high healthcare resource utilization. Accurate coding supports appropriate risk adjustment for these complex patients.

Documentation Requirements

• ✓Pathology confirmation with histological type (squamous cell most common, adenoid cystic, mucosal melanoma)
• ✓Imaging documenting extent of disease and invasion of adjacent structures (orbit, palate, infratemporal fossa)
• ✓TNM staging specific to maxillary sinus (Ohngren line relevant for prognosis)
• ✓Treatment plan including surgical approach and radiation therapy
• ✓Clear documentation distinguishing maxillary sinus from other paranasal sinuses

Commonly Confused Codes