1. Association of State Insulin Out-of-Pocket Caps With Insulin Cost-Sharing and Use Among Commercially Insured Patients With Diabetes : A Pre-Post Study With a Control Group.
- Author
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Garabedian LF, Zhang F, Costa R, Argetsinger S, Ross-Degnan D, and Wharam JF
- Subjects
- Humans, United States, Control Groups, Cost Sharing, Health Expenditures, Insulin therapeutic use, Diabetes Mellitus drug therapy
- Abstract
Background: Twenty-five states have implemented insulin out-of-pocket (OOP) cost caps, but their effectiveness is uncertain., Objective: To examine the effect of state insulin OOP caps on insulin use and OOP costs among commercially insured persons with diabetes., Design: Pre-post study with control group., Setting: Eight states implementing insulin OOP caps of $25 to $30, $50, or $100 in January 2021, and 17 control states., Participants: Commercially insured persons with diabetes and insulin users younger than 65 years. Subgroups of particular interest included members from states with insulin OOP caps of $25 to $30, enrollees with health savings accounts (HSAs) that require high insulin OOP payments, and lower-income members., Measurements: Mean monthly 30-day insulin fills and OOP costs., Results: State insulin caps were not associated with changes in insulin use in the overall population (relative change in fills per month, 1.8% [95% CI, -3.2% to 6.9%]). Insulin users in intervention states saw a 17.4% (CI, -23.9% to -10.9%) relative reduction in insulin OOP costs, largely driven by reductions among HSA enrollees; there was no difference in OOP costs among nonaccount plan members. More generous ($25 to $30) state insulin OOP caps were associated with insulin OOP cost reductions of 40.0% (CI, -62.5% to -17.6%), again primarily driven by a larger reduction in the subgroup with HSA plans., Limitations: Single national insurer; 9-month follow-up., Conclusion: Insulin OOP caps were associated with reduced insulin OOP costs but no overall increases in insulin use. A proposed national insulin cap of $35 for commercially insured persons might lead to meaningful insulin OOP savings but have a limited effect on insulin use., Primary Funding Source: Centers for Disease Control and Prevention and National Institute of Diabetes and Digestive and Kidney Diseases., Competing Interests: Disclosures: Disclosures can be viewed at www.acponline.org/authors/icmje/ConflictOfInterestForms.do?msNum=M23-1965.
- Published
- 2024
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