Summary & Overview
CPT 31297: Endoscopic Dilation of Sphenoid Sinus Ostium
CPT code 31297 represents endoscopic dilation of the sphenoid sinus ostium via a transnasal endoscopic approach. The procedure targets the sphenoid sinus opening to improve drainage and ventilation and is part of surgical management for sphenoid sinus disease. Nationally, this code matters as a specific, procedure-level descriptor used for claims, utilization tracking, and policy decisions related to sinus surgery and otolaryngology practice patterns.
Major payers typically included in coverage and benchmarking for this service are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. These payers commonly influence prior authorization, medical necessity criteria, and reimbursement rates for endoscopic sinus procedures.
Readers will learn the clinical context for the code, typical sites of service, and how the procedure is classified for billing. The publication presents benchmarks and policy-relevant information such as utilization trends, payer coverage considerations, and coding guidance to inform billing, compliance, and operational decision-making. Data not available in the input for specific payer policies, associated taxonomies, and ICD-10 diagnoses are noted as unavailable where applicable.
Billing Code Overview
CPT code 31297 describes endoscopic dilation of the sphenoid sinus ostium performed by passing an endoscope through the nasal cavity to enlarge the opening of the sphenoid sinus. This procedure is an endoscopic sinus surgery technique focused on restoring drainage and ventilation of the sphenoid sinus.
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Service type: Endoscopic sinus dilation procedure
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Typical site of service: Ambulatory surgery center or hospital outpatient department
Clinical & Coding Specifications
Clinical Context
A 48-year-old patient presents to an otolaryngology clinic with persistent postnasal drainage, facial pressure localized to the sphenoid region, and recurrent headaches despite medical therapy including intranasal corticosteroids and antibiotics. Nasal endoscopy and CT sinus imaging demonstrate sphenoid ostial narrowing with mucosal thickening and retention consistent with chronic sphenoid sinusitis and ostial stenosis. The patient is scheduled for an in-office or operating room endoscopic procedure under monitored anesthesia care or general anesthesia.
The procedure involves passage of a nasal endoscope through the nasal cavity to visualize the sphenoethmoidal recess and identify the sphenoid ostium. Under direct visualization, the provider dilates the sphenoid ostium (balloon or mechanical dilation) to re-establish drainage and ventilation of the sphenoid sinus. Intraoperative steps include topical decongestion, endoscopic inspection, ostial localization, controlled dilation of the ostium, hemostasis, and postoperative nasal packing or splinting if indicated. Typical perioperative documentation includes indication, informed consent, preoperative imaging findings, anesthesia type, procedural technique (instrumentation and dilation method), ostium size pre- and post-dilation, estimated blood loss, complications, and postoperative instructions for saline irrigations and follow-up endoscopy.
Typical site of service: ambulatory surgical center or hospital outpatient/operating room; selected cases may be performed in a procedure room under local anesthesia.
Typical patient scenario modifiers: patients may have prior sinus surgery, bilateral disease, or require concurrent procedures such as septoplasty or ethmoidectomy; documentation should support any modifier applied (e.g., laterality, increased procedural services, or unrelated concurrent procedures).
Coding Specifications
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