A Yale University study analyzed the experience of 60 million Americans covered by traditional Medicare between 1999 and 2013, and found "jaw-dropping improvements in almost every area," the lead author says. Ann Cutting/Getty Images hide caption

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AstraZeneca's Nexium was the top drug in Medicare Part D's spending on prescription medicines. Daniel Acker/Bloomberg via Getty Images hide caption

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Lorenzo Gritti for NPR

Shopping for an MRI scan? Guroo.org, won't yet show you what your local hospital or radiologist charges, but it will reveal the average cost of the test in your area. iStockphoto hide caption

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Heartland Regional Medical Center in St. Joseph, Mo., is changing its name to Mosaic Life Care. It was the focus of an NPR and ProPublica investigation into its billing practices. Steve Hebert for ProPublica hide caption

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Steven Brill is a journalist who also founded Court TV, American Lawyer magazine, 10 regional legal newspapers and Brill's Content Magazine. He teaches journalism at Yale. Courtesy of Random House hide caption

toggle caption Courtesy of Random House