CPT code 31298 denotes endoscopic balloon dilation of the ostia of the frontal and sphenoid sinuses using a balloon-tipped catheter passed through the nasal cavity. This minimally invasive sinus procedure is used to enlarge sinus openings and restore ventilation and drainage, reducing symptoms associated with chronic rhinosinusitis and other obstructive sinus conditions. Nationally, the code is relevant to ambulatory surgical and hospital outpatient settings where otolaryngology practices and ear, nose, and throat specialists perform image-guided or endoscopic procedures.

Key payers covered in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication outlines payer coverage patterns, coding and billing benchmarks, clinical context for appropriate use, and relevant policy or reimbursement updates affecting outpatient endoscopic sinus interventions. Readers will find a concise clinical description, typical site-of-service guidance, common billing modifiers and codes when available, and comparative benchmarks where data exists. When specific input fields were not provided, the text notes that data is not available in the input. The intent is to give coding, billing, and policy stakeholders a clear, national-level reference for CPT code 31298 and its role in modern sinus care delivery.