What question did this study set out to answer?

This study aimed to evaluate how the Inflation Reduction Act's annual out-of-pocket spending caps for Medicare altered prescription medication fills.

June 20, 2026JAMA Health ForumOpen Access

Changes in Medication Use After Medicare Part D Annual Out-of-Pocket Spending Caps

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Authors

CCChristopher L. CaiBrigham and Women's Hospital KAKelly E. AndersonBrigham and Women's Hospital AKAaron S. KesselheimBrigham and Women's Hospital

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Implication

Randomized trial evaluates medication access post-Medicare spending caps in the Medicare population, suggesting improved access for high-cost medications.

Key Points

This study aimed to evaluate how the Inflation Reduction Act's annual out-of-pocket spending caps for Medicare altered prescription medication fills.
Used an all-payer pharmacy database from 2022 to 2025
Compared quarterly prescription fills before and after the IRA's implementation
Applied difference-in-differences analysis to assess medication access changes
Very-high-cost medication use increased by 22.7% (95% CI, 6.0% to 42.0%; P = .01) after cap implementation
Increased use of high-cost medications by 23.1% (95% CI, 2.7% to 47.4%)
Overall medication use in Medicare compared to commercial insurance increased by 4.1% by Q4 2025.

Cite This Study

Cai et al. (2026) studied this question.

synapsesocial.com/papers/6a362e91db0793dc1a5363be https://doi.org/10.1001/jamahealthforum.2026.1545

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Implication

Randomized trial evaluates medication access post-Medicare spending caps in the Medicare population, suggesting improved access for high-cost medications.

Changes in Medication Use After Medicare Part D Annual Out-of-Pocket Spending Caps

Discussion

Member takes

Implication

Key Points

Cite This Study

Changes in Medication Use After Medicare Part D Annual Out-of-Pocket Spending Caps

Discussion

Member takes

Implication

Key Points

Cite This Study

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