Since 2005, seniors have had the option to receive their Medicare benefits through a private plan of their choice offered under Medicare Advantage (MA).  Since that time, studies have increasingly shown that MA plans offer superior services to their participants with better health outcomes, says Kathryn Nix, a policy analyst at the Heritage Foundation. Since its inception with a population of 5.3 million participants, MA plans have doubled in size and continue to grow. In 2010, close to 25 percent [...]