Summary & Overview
CPT 66170: Trabeculostomy and Trabecular Meshwork Excision for Glaucoma
CPT code 66170 denotes an ophthalmic surgical procedure that creates a fistula and removes part of the trabecular meshwork to treat glaucoma and lower intraocular pressure. This intervention is a clinically significant option for patients with open-angle glaucoma or other forms of medically uncontrolled intraocular hypertension where improving aqueous outflow is indicated. Nationally, procedural codes for glaucoma surgery are important for tracking utilization of operative interventions as alternatives to medical therapy and for monitoring access to specialty surgical care.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The coverage and reimbursement policies for glaucoma surgery vary across these payers and between commercial and government programs, influencing site-of-service choices such as ambulatory surgery centers versus hospital operating rooms.
Readers will learn the clinical context of the procedure, typical settings where it is performed, and which major payers are relevant for coverage considerations. The publication also outlines typical benchmarking and policy themes that affect billing and utilization for operative glaucoma treatments. Data not available in the input are indicated where applicable.
Billing Code Overview
CPT code 66170 describes a surgical procedure in which the provider creates a fistula and excises part of the trabecular meshwork to treat glaucoma and reduce intraocular pressure. This procedure is an operative glaucoma surgery focused on enhancing aqueous outflow by removing a portion of the eye's drainage tissue.
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Service type: Surgical ophthalmology procedure
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Typical site of service: Hospital operating room or ambulatory surgery center
Clinical & Coding Specifications
Clinical Context
A 68-year-old patient with a history of primary open-angle glaucoma presents with progressive visual field loss and uncontrolled intraocular pressure (IOP) despite maximally tolerated topical medical therapy. The ophthalmologist performs a trabeculectomy-style procedure to create a controlled fistula and excise part of the trabecular meshwork to enhance aqueous outflow and lower IOP. Typical preoperative workflow includes ophthalmic history, slit-lamp exam, gonioscopy, IOP measurement, and informed consent. The procedure is most often performed in an ambulatory surgical center or hospital outpatient department under monitored anesthesia care or local/regional anesthesia. Postoperative workflow includes topical antibiotics and steroids, IOP checks, suture adjustment or bleb management as needed, and follow-up visits at day 1, week 1, and month 1 to monitor pressure, bleb function, and complications such as hypotony, bleb leak, or infection.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When reporting only the surgeon's professional component separate from technical ASC facility billing (rare for this operative code). |
50 | Bilateral procedure |