CPT code 66174 captures a glaucoma-related surgical procedure that expands the eye's aqueous outflow (drainage) canal without placing a device or stent. Nationally relevant for ophthalmology practices and surgical centers, the code distinguishes non-implant canaloplasty or trabecular expansion techniques from device-based interventions and affects coding, billing, and clinical documentation for glaucoma pressure-management procedures. Key payers in typical analyses include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

This publication explains the clinical intent of CPT code 66174, clarifies common service settings and procedural scope, and summarizes what readers can expect about coverage and billing practice differences across major payers. Topics covered include procedural definition and clinical context, common billing considerations, typical sites of service, and where to look for payer-specific coverage guidance. The content highlights how the code is used in surgical workflows and documentation, and identifies areas where payers commonly request additional supporting information. Data not available in the input is noted where payer-specific policies, reimbursement rates, or associated ICD-10 mappings would normally be detailed.