Summary & Overview
CPT 31070: Trephination to Create Opening into Frontal Sinus
CPT code 31070 denotes trephination to create an opening into the frontal sinus, a surgical approach used to access frontal sinus air cells for drainage, inspection, or adjunctive procedures. This code is relevant nationally for otolaryngology and specialty surgical billing because frontal sinus procedures carry specific operative considerations and impact facility and professional payment pathways. Key payers in typical comparisons include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will find clinical context about the procedure, the typical site of service (operating room or ambulatory surgical center), and the service type (surgical, otolaryngology/head and neck). The publication also summarizes payer coverage patterns and benchmarking where available, highlights common billing and coding themes for frontal sinus access procedures, and outlines areas where policy updates or payer-specific rules commonly affect reimbursement. Data not available in the input are noted as such in detailed sections. The material is intended for billing managers, clinicians involved in sinus surgery, and policy analysts seeking a concise national overview of CPT code 31070 and its clinical and administrative implications.
Billing Code Overview
CPT code 31070 describes a trephination to create an opening into the frontal sinus, a surgical procedure in which the provider punctures the skull to access the frontal sinus air spaces located above the eye orbits. The service involves creating a direct opening into the frontal sinus to facilitate drainage, inspection, or other surgical interventions related to frontal sinus disease.
Service Type: Surgical, Otolaryngology/Head and Neck Surgery
Typical Site of Service: Operating room or ambulatory surgical center, with procedures performed under appropriate anesthesia and sterile conditions.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult presenting to the emergency department or otolaryngology clinic with acute frontal sinusitis complicated by frontal sinus mucocele, subperiosteal abscess, or refractory frontal sinus obstruction with intolerable pain and risk of intracranial extension. The patient often has a history of persistent frontal headache, fever, purulent nasal discharge, and focal tenderness over the frontal sinus. Imaging (CT of the sinuses) demonstrates frontal sinus opacification, air-fluid level, or bony erosion suggesting retained infection or mucocele. Initial management includes IV antibiotics, nasal decongestants, and analgesia. When conservative therapy fails or there is a localized abscess or need for immediate drainage, the surgical team performs trephination of the frontal sinus (31070) to create a small opening through the frontal bone for drainage and irrigation. The procedure typically occurs in an operating room or procedure suite under local anesthesia with sedation or general anesthesia depending on patient factors and concurrent procedures. Post-procedure care includes sinus irrigation, culture of purulent material, short course IV or oral antibiotics, wound care, and follow-up with otolaryngology to plan definitive endoscopic frontal sinusotomy if indicated.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when substantially greater work is required (e.g., difficult trephination with extensive dissection, unexpected intraoperative findings). |