Summary & Overview
CPT 31233: Diagnostic Endoscopic Access to Maxillary Sinus
CPT code 31233 denotes a diagnostic endoscopic entry into the maxillary sinus via perforation of the canine fossa or inferior meatus, followed by opening of the sinus for direct visualization. This procedure is clinically significant for diagnosing sinus disease, evaluating persistent or complex maxillary sinus pathology, and guiding subsequent therapeutic interventions. Nationally, accurate use of this surgical endoscopy code is important for procedural tracking, clinical documentation, and appropriate payment for otolaryngology services.
Key payers covered in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The summary addresses how payers typically classify and reimburse surgical endoscopy services, common billing considerations, and procedural context relevant to hospital and ambulatory surgical settings.
Readers will learn the clinical scope of the code, typical settings where the procedure is performed, and the types of benchmarks and policy considerations that commonly accompany this category of surgical endoscopy codes. The publication also outlines documentation elements that support use of CPT code 31233, summarizes common modifiers used with surgical procedures, and identifies where data is unavailable in the supplied input. Data not available in the input includes detailed payer-specific rates, associated taxonomies, ICD-10 pairings, and related codes.
Billing Code Overview
CPT code 31233 describes a diagnostic endoscopic procedure in which the provider perforates the canine fossa or inferior meatus to advance an endoscope into the maxillary sinus and then opens the maxillary sinus to perform diagnostic endoscopy. This procedure is an endoscopic evaluation of the maxillary sinus typically performed by an otolaryngologist (ENT).
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Service type: Diagnostic endoscopic maxillary sinus access and inspection
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Typical site of service: Ambulatory surgical center or hospital operating room, often under monitored anesthesia care or general anesthesia
Data not available in the input for payers, associated taxonomies, ICD-10 diagnoses, related codes, and service line.
Clinical & Coding Specifications
Clinical Context
A 42-year-old patient presents to the otolaryngology clinic with several months of unilateral nasal obstruction, purulent rhinorrhea, facial pressure over the maxillary region, and decreased sense of smell despite multiple courses of oral antibiotics. Nasal endoscopy in clinic demonstrates mucopurulent drainage from the middle meatus and suspicion for chronic maxillary sinus disease. CT imaging of the sinuses shows opacification of the ipsilateral maxillary sinus with possible antral polypoid change. The patient is scheduled for an operative diagnostic nasal endoscopy under monitored anesthesia care or general anesthesia. In the operating room, the surgeon performs transantral access by perforating the canine fossa or inferior meatus to advance an endoscope into the maxillary sinus and opens the sinus ostium for diagnostic evaluation and targeted culture or biopsy if indicated. Typical site of service is an ambulatory surgery center or hospital outpatient surgery department. Usual workflow includes preoperative consent and imaging review, intraoperative diagnostic endoscopy of the maxillary sinus using 31233, possible concurrent procedures based on findings, and postoperative recovery with topical or systemic therapy directed by endoscopic findings and cultures.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier applicable; standard reporting | Rarely used; default when no specific modifier applies |