Chronic maxillary sinusitis

This code represents a persistent, long-standing inflammation of the maxillary sinus, which is one of the paranasal sinuses located in the cheekbones. It is characterized by symptoms such as facial pain or pressure, nasal congestion, and discharge that have lasted for 12 weeks or more.

Use this code when documentation clearly indicates a diagnosis of chronic inflammation specifically affecting the maxillary sinus. This diagnosis is typically supported by a physician's assessment, imaging studies (e.g., CT scan), and a history of symptoms exceeding three months.

• Differentiate from acute maxillary sinusitis, which has a shorter duration of symptoms.
• Ensure documentation specifies "maxillary" to avoid confusion with other chronic sinusitis types.
• Look for physician notes explicitly stating "chronic maxillary sinusitis" or "chronic inflammation of the maxillary sinus."