Five-Year, Private Sector Cost Comparison of iStent inject® W, Trabeculectomy, Glaucoma Medications for Primary Open-Angle Glaucoma With and Without Phacoemulsification: A Filipino Patient Perspective

Abstract

Objective: To perform a cost comparison of the 5-year total direct medical costs of iStent inject® W vs. trabeculectomy vs. glaucoma medications for the treatment of primary open-angle glaucoma, with and without phacoemulsification, from the perspective of Filipino patients.

Methods: This cost-comparative analysis compared total private sector costs of surgery, post-operative care, and medication usage over 5 years on combined phacoemulsification (combined) or standalone (SA) procedures using iStent inject W, trabeculectomy, and glaucoma medications for the general population and senior citizens/individuals with disabilities. Data, including unit costs and frequencies, were obtained from published literature and local primary research. Scenario analysis consisted of three payment models: 100% out-of-pocket (OOP), coverage from PhilHealth public health insurance, and combined subsidies from both private and PhilHealth insurance.

Results: iStent inject W was less costly than glaucoma medications in all scenarios and patient populations. When compared with trabeculectomy, iStent inject W, was less costly in all patient populations in the OOP scenario, providing savings of 5% for SA procedures and 5% to 6% for combined procedures. It was also less costly as a combined procedure in all populations in the combined private health and PhilHealth insurance scenario, offering 6% savings in the general population and 9% in elderly and disabled patients. However, it was costlier by 1% in the PhilHealth scenario. As an SA procedure, it was costlier vs. trabeculectomy in both populations in the PhilHealth and PhilHealth plus private health insurance scenarios by 18% to 22% and 101% to 109%, respectively. The highest incremental cost for iStent inject W was US$1,662 vs. trabeculectomy as an SA procedure in the general population under the combined private health and PhilHealth insurance scenario.

Conclusion: For Filipino glaucoma patients who are treated in the private sector, iStent inject W, whether combined or as an SA procedure, may be cost-saving compared with glaucoma medications over a 5-year period; however, it may be costlier compared with trabeculectomy depending on health insurance coverage scenarios.