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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Coordinating care for high-risk patients was expected to save money and improve quality of care. A Medicare experiment didn't pan out. Roy Scott/Getty Images/Ikon Images hide caption

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One of the first signs drivers see on the way into Unionville, Mo. is this billboard advertising cardiology at Putnam County Memorial Hospital. Offering specialty services, like cardiology and psychiatry turned the hospital around, community leaders say. Bram Sable-Smith/KBIA/Side Effects Public Media hide caption

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