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Updated: Jun 27, 2026

Improving IV Insulin Administration in a Community Hospital
Published on: June 11, 2012
Effect of an out-of-pocket insulin cap in Medicare part D
Yevgeniy Feyman1, Thomas Buchmueller2
1School of Pharmacy, University of Washington, Seattle, WA 98195, United States.
Introduction:
Out-of-pocket (OOP) costs can often impede patients' access to prescription drugs. The Inflation Reduction Act of 2022 (IRA) limited OOP costs for insulin products covered by the Medicare Part B and Part D programs to no more than $35 for a one-month supply.
Methods:
This analysis uses prescription drug data from Medicare Part D and commercially insured patients along with a difference-in-differences specification to estimate changes in OOP costs among Medicare Part D enrollees after policy implementation.
Results:
We estimate that the Part D enrollees most likely to be affected by the policy saw a $34.71 reduction in average OOP costs per prescription across all insulins compared to what might have occurred absent the policy in 2023.
Conclusion:
These findings suggest that targeted limits on OOP costs for high-value drugs can reduce the cost burden for patients.
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