In this issue of JAMA Internal Medicine, Feldman and colleagues 1 report that Medicare spending on insulin for patients with diabetes was an estimated $7.8 billion, which is $4.4 billion more than the Centers for Medicare & Medicaid Services might have spent by using the prices negotiated by the US Department of Veterans Affairs and their formulary restrictions. Even if the $4.4 billion figure overestimates the potential savings, the potential for lower prices would substantially increase many patients' access to life-saving insulin products. The report by Feldman et al 1 is one of several studies that JAMA Internal Medicine has recently published illustrating the opportunities for savings of billions of dollars annually in the Medicare Part D prescription drug program. For the top 50 oral drugs dispensed based on Medicare spending, Venker et al 2 estimated that by using US Department of Veterans Affairs medication prices, Medicare could have saved up to $14.4 billion in 2016 of the estimated $32.5 billion spent. For angiotensin-converting enzyme inhibitors and angiotensin-II-receptor blockers alone, Growdon et al 3 estimated potential Medicare savings in 2016 and 2017 at $676 million of the total $754 million spent by using generic substitution and therapeutic interchange. For inhaler prescriptions, Feldman et al 4 previously estimated potential Medicare savings in 2017 of up to $4.2 billion of the $7.3 billion spent through use of negotiated prices and a defined formulary. These studies have a consistent and clear message. At present, the issue for the federal government is not the ability to easily save billions of dollars each year in Medicare Part D spending. Rather, the issue is the political will in Washington, DC, to facilitate savings through legislation and regulatory changes, such as measures that would allow price negotiations, benchmark pricing, and formulary restrictions, and in states to remove prescribing barriers, such as those for generic substitution and therapeutic interchange.