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.
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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 |
11 | Physician or other qualified health care professional service | Use to indicate the usual or routine service by the reporting clinician |
22 | Increased procedural services | Use when work required is substantially greater than typically required (document rationale) |
23 | Unusual anesthesia | Use when general anesthesia is required for a procedure normally performed with local or no anesthesia |
26 | Professional component | Use if separate professional component is billed for interpretation when applicable (e.g., imaging interpretation tied to procedure) |
50 | Bilateral procedure | Use when the procedure is performed on both maxillary sinuses in the same session |
51 | Multiple procedures | Use when 31233 is reported with other distinct CPT procedures during the same operative session |
52 | Reduced services | Use when the procedure is partially reduced or not completed as planned (document extent) |
53 | Discontinued procedure | Use when the procedure is started but terminated due to extenuating circumstances or patient condition |
58 | Staged or related procedure or service by the same physician during the postoperative period | Use when this procedure is planned as a staged component of care |
62 | Two surgeons | Use when two surgeons work together as primary surgeons performing distinct portions of the procedure |
63 | Procedure performed on infants less than 4 kg | Rarely applicable; use only when patient weight meets criteria |
QX | Service furnished under an employer or underwritten by a worker’s compensation plan | Use when billing an applicable third-party arrangement (modifier set QX often indicates non-physician practitioner services) |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
207P00000X | Otolaryngology | Primary specialty performing diagnostic endoscopy of the maxillary sinus |
207L00000X | Facial Plastic and Reconstructive Surgery | May perform transantral endoscopic procedures in complex sinonasal cases |
207R00000X | Allergy & Immunology | Involved perioperatively for allergic disease management though not typically performing the procedure |
363A00000X | Anesthesiology | Provides monitored anesthesia care or general anesthesia in the outpatient or hospital setting |
2080P0003X | Oral and Maxillofacial Surgery | May be involved when transantral access intersects dental or maxillofacial considerations |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
J32.0 | Chronic maxillary sinusitis | Direct indication for diagnostic maxillary sinus endoscopy and transantral access |
J01.90 | Acute sinusitis, unspecified | Acute exacerbations with localized maxillary disease may prompt diagnostic endoscopy |
J33.0 | Polyp of nasal cavity | Nasal polyps can obstruct ostia and necessitate diagnostic and therapeutic sinus endoscopy |
J34.2 | Deviated nasal septum | Contributes to ostial obstruction and may be addressed during the same operative session |
K08.8 | Other specified disorders of teeth and supporting structures | Dental origin sinus disease (odontogenic sinusitis) may require transantral evaluation |
D49.2 | Neoplasm of uncertain behavior of respiratory and intrathoracic organs | Mass or suspicious lesion within the maxillary sinus identified on imaging may require diagnostic endoscopy with biopsy |
B95.3 | Streptococcus, as the cause of diseases classified elsewhere | Positive cultures obtained via diagnostic endoscopy may identify causative organisms guiding therapy |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
31237 | Nasal/sinus endoscopy, surgical; with biopsy, polypectomy, or debridement (intranasal, including maxillary antrostomy) | Often performed concurrently if therapeutic sinus opening or polypectomy is required after diagnostic 31233 |
31288 | Nasal/sinus endoscopy, surgical, with ethmoidectomy; total (anterior and posterior) | Performed when disease extends beyond the maxillary sinus into the ethmoid complex and broader surgical management is needed |
31267 | Nasal/sinus endoscopy, surgical with balloon dilation of maxillary ostium | Alternative or adjunctive technique for maxillary ostium dilation; may be used instead of or following diagnostic access |
31575 | Laryngoscopy, flexible fiberoptic; diagnostic conversion to operative laryngoscopy when direct interventions are performed | Provides parallel concept for diagnostic endoscopy converted to therapeutic intervention when pathology requires |
30130 | Submucous resection, inferior turbinate; partial or complete | Common adjunct when treating nasal obstruction contributing to sinus disease; may be performed in the same operative session |
69210 | Removal of impacted cerumen using irrigation/diagnostic ear procedures | Data not available in the input. |