About The Study: Despite rapid expansion of ultraexpensive drugs in Medicare Part D, this cohort study found that availability in comparable economies remains limited, and internationally unavailable products often have higher per-beneficiary spending, underscoring their fiscal significance.
Corresponding Author: To contact the corresponding author, So-Yeon Kang, PhD, MBA, email soyeon.kang@georgetown.edu .
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(doi:10.1001/jamanetworkopen.2026.10053)
Editor’s Note: Please see the article for additional information, including other authors, author contributions and affiliations, conflict of interest and financial disclosures, and funding and support.
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