Summary & Overview
CPT 31255: Anterior and Posterior Ethmoidectomy
CPT code 31255 represents an anterior and posterior ethmoidectomy — endoscopic surgical removal of ethmoid sinus cells involving both the anterior and posterior compartments. This sinus surgery code is used for procedures addressing widespread ethmoid sinus disease, commonly performed to treat chronic or recurrent sinusitis that compromises drainage and ventilation. Nationally, accurate coding for ethmoidectomy is important for clinical documentation, surgical quality tracking, and payer adjudication of otolaryngology services.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The coverage landscape for endoscopic sinus procedures typically hinges on documented medical necessity, prior conservative therapy, and clear operative reports describing the anatomic extent addressed.
Readers will find an overview of the clinical context for anterior and posterior ethmoidectomy, common sites of service where the procedure is performed, and the payer mix addressed. The publication summarizes benchmarks and policy considerations relevant to reimbursement and authorization practices for surgical sinus procedures, highlights documentation elements that commonly affect coverage decisions, and provides a concise reference for coding and billing teams. Data not available in the input is noted where specific payer policies, associated taxonomies, and ICD-10 diagnosis mappings are not supplied.
Billing Code Overview
CPT code 31255 describes an anterior and posterior ethmoidectomy, the surgical removal or excision of ethmoid sinus cells involving both the anterior and posterior compartments of the ethmoid sinus. This procedure is generally performed when sinusitis affects both regions of the ethmoid sinus and aims to restore normal drainage and ventilation of the paranasal sinuses.
Service type: Endoscopic sinus surgery / Otolaryngology surgical procedure
Typical site of service: Hospital outpatient department or ambulatory surgical center, with procedures performed under general anesthesia in an operating room or dedicated procedure suite.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult presenting with chronic or recurrent rhinosinusitis unresponsive to prolonged medical therapy (antibiotics, intranasal corticosteroids, saline irrigations) and imaging demonstrating disease in both the anterior and posterior ethmoid air cells. The workflow begins with outpatient evaluation by an otolaryngologist, including nasal endoscopy and CT sinus imaging. When medical management fails and CT shows opacified or diseased anterior and posterior ethmoid air cells, the surgeon schedules functional endoscopic sinus surgery (FESS) with 31255 for anterior and posterior ethmoidectomy. The procedure is commonly performed in an ambulatory surgery center or hospital operating room under general anesthesia. Preoperative steps include informed consent, medication reconciliation, and perioperative antibiotics or topical decongestants per surgeon protocol. Intraoperatively, endoscopic instruments and image guidance may be used to remove diseased ethmoid cells while preserving surrounding structures. Postoperative care involves short-term nasal packing or absorbable hemostatic agents as needed, nasal saline irrigations, topical corticosteroids, and follow-up endoscopic debridement in clinic. Indications include persistent purulent drainage, facial pain/pressure, obstructive symptoms, complications such as mucocele, or involvement of both anterior and posterior ethmoid compartments on imaging.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
25 | Significant, separately identifiable evaluation and management service by the same physician on the day of procedure |