CPT 31235: Diagnostic Endoscopy of the Sphenoid Sinus
CPT code 31235 represents a diagnostic endoscopic evaluation of the sphenoid sinus, performed either via puncture or through the natural ostium. This code captures a targeted sinonasal diagnostic procedure used to directly visualize the sphenoid sinus for assessment or sampling. Nationally, it is relevant for otolaryngology practice patterns, facility coding for ambulatory and hospital outpatient settings, and payer coverage determinations tied to sinus disease management.
Key payers included in this overview are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical intent and settings for the procedure, typical coding considerations, and what to expect in payer coverage reviews. The publication outlines benchmarks and utilization context, highlights common modifier usage provided in the input, and summarizes implications for facility and professional billing workflows.
The content is organized to clarify clinical context, typical sites of service, and the role of this diagnostic endoscopy in evaluating sphenoid sinus disease. Data not available in the input is noted where applicable. The piece is intended for coding professionals, health plan reviewers, and clinicians who need a succinct reference to CPT code 31235 in national billing and coverage conversations.
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Billing Code Overview
CPT code 31235 describes a diagnostic endoscopy of the sphenoid sinus, performed either through a direct puncture of the sinus or via the sinus's natural ostium. The procedure is intended to visualize the sphenoid sinus cavity for diagnostic purposes, which may include inspection, sampling, or assessment of sinus pathology.
Service type: Diagnostic endoscopy (sphenoid sinus)
Typical site of service: Hospital outpatient department or ambulatory surgical center, and may also be performed in specialized clinic procedure rooms equipped for endoscopic sinus procedures when appropriate equipment and clinical support are available.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult presenting to an otolaryngology clinic or an ambulatory surgery center with recurrent or persistent sphenoid sinus symptoms such as deep-seated retro-orbital pressure, persistent post-nasal drip, or refractory sinusitis despite medical therapy. After clinical evaluation and CT imaging suggest isolated sphenoid sinus disease (mucous retention cyst, focal opacification, or suspected fungal infection), the provider schedules a diagnostic sphenoid endoscopy to directly visualize the sphenoid sinus ostium. The procedure is performed under local anesthesia with sedation or general anesthesia depending on patient tolerance and comorbidities. Endoscopic access is obtained through the nasal cavity via the natural ostium or via a puncture approach to sample sinus contents, inspect mucosa, and obtain cultures or tissue biopsy. Typical workflow includes preoperative consent, image review, intraoperative endoscopic inspection with targeted sampling, hemostasis, and brief recovery. This procedure is commonly performed in the ambulatory surgical center or hospital outpatient department when diagnostic sampling or direct visualization of the sphenoid sinus is required.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | When work or time is substantially greater than typical for the procedure due to extensive scarring or anatomic complexity |
23 | Unusual anesthesia | When a medically necessary general anesthesia is used but normally local anesthesia is expected |
26 | Professional component | When billing only the physician’s interpretation/visualization and technical component billed separately |
52 | Reduced services | When the procedure is partially completed or limited in scope |
53 | Discontinued procedure | When procedure is started but halted for patient safety reasons prior to completion |
59 | Distinct procedural service | When another distinct, separate endoscopic sinus procedure is performed the same day and needs separation |
62 | Two surgeons | When two surgeons with different specialties perform distinct portions of the procedure |
66 | Surgical team | When a surgical team approach is documented for complex intraoperative management |
78 | Return to operating room for related procedure during postoperative period | When an immediate postoperative return to OR is required for a complication related to the initial procedure |
79 | (Not in source list) | Data not available in the input. |
LT | Left side | To designate procedure performed on the left sphenoid sinus when laterality reporting is required |
RT | Right side | To designate procedure performed on the right sphenoid sinus when laterality reporting is required |
TC | Technical component | When billing only the technical component (facility/equipment) and physician bills separately |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| 207P00000X | Otolaryngology | Primary specialty performing diagnostic sphenoid endoscopy |
| 2084P0800X | Otolaryngology - Head & Neck Surgery | Often involved for more complex sinonasal disease and biopsies |
| 207L00000X | Allergy & Immunology | May refer patients with chronic rhinosinusitis and allergic contributors |
| 364S00000X | Anesthesiology | Provides sedation/general anesthesia when required |
| 363A00000X | Emergency Medicine | Occasionally involved if performed emergently in hospital settings |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
J01.30 | Acute sphenoid sinusitis, unspecified | Direct indication for diagnostic sphenoid endoscopy to confirm infection and obtain cultures |
J32.1 | Chronic sphenoid sinusitis | Common chronic indication when symptoms persist despite medical therapy and endoscopic assessment or sampling is required |
J33.8 | Other nasal polyp | Polyps extending toward the sphenoid may prompt endoscopic examination and sampling |
J34.89 | Other specified disorders of nose and nasal sinuses | Used for atypical sinonasal pathology localized to sphenoid requiring diagnostic endoscopy |
B44.0 | Invasive pulmonary aspergillosis (sinus involvement) | Fungal sinus disease suspicion may necessitate sphenoid endoscopic sampling for fungal identification |
R07.82 | Throat and chest pain | Symptom code that may accompany sphenoid sinus disease prompting diagnostic evaluation |
R09.81 | Nasal congestion | A presenting symptom that can lead to diagnostic endoscopy when localized to sphenoid sinus |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
31237 | Nasal/sinus endoscopy, surgical; with biopsy, polypectomy or debridement (separate procedure) | May be performed if biopsy or debridement of sphenoid sinus mucosa is required beyond diagnostic visualization |
31276 | Nasal/sinus endoscopy, surgical; with dilation of frontal or sphenoid sinus ostium | Performed when the diagnostic endoscopy identifies obstructive anatomy requiring dilation of the sphenoid ostium |
31267 | Nasal/sinus endoscopy, surgical; with removal of impacted tissue or foreign body | Used when endoscopic removal of impacted material from the sphenoid is undertaken during the same session |
31575 | Laryngoscopy, flexible or rigid, diagnostic | May be performed in the same setting for concurrent evaluation of adjacent airway structures |
31231 | Nasal/sinus endoscopy, diagnostic; with biopsy, or culture of nasal/sinus mucosa | Similar diagnostic utility for other paranasal sinuses and may be billed when multiple sinus sites are sampled |