A new study by economists Amanda Starc of Northwestern’s Kellogg School of Management and Robert Town of the University of Texas highlights how “profit-maximizing” Part D plans are incentivized to limit benefits or increase costs for Medicare beneficiaries because they are not responsible for costs incurred by other parts of the Medicare (ex. hospitalizations). As detailed in the study, Part D plans are motivated by incentives that are sometimes counter to the best interests of patients; they are explicitly incentivized to reduce drug spending, while they have no financial responsibility for the holistic health of the patient. In the study, the authors conclude that in covering drugs less generously, Part D plans end up costing traditional Medicare $475 million per year – a stat that does not account for other social costs, such as the inconvenience and suffering of beneficiaries who end up in the hospital. This study highlights the importance of Medicare’s six protected classes, which ensure that patients with the most complex conditions are guaranteed access to the full range of drugs under Medicare Part D – limiting future medical complications, hospitalizations, and additional costs to the Medicare program.