A new GAO report reviews trends in Medicare Advantage (MA) enrollment, premiums, and benefits from 2010 to 2011. According to the GAO’s analysis, enrollment in MA plans reviewed increased by about 6% (7.9 million to 8.4 million) from April 2010 to April 2011, although enrollment changes varied by plan type (health maintenance organizations versus preferred provider organizations). On the other hand, the number of MA plans decreased from 2,307 to 1,964. Average monthly MA premiums fell from $28 in 2010 to $24 in 2011, which also varied substantially among plan types. MA plans expected beneficiary cost-sharing levels to average about half of fee-for-service levels in both 2010 and 2011 (cost-sharing was lower for HMOs than regional PPOs). Coverage of additional benefits were at similar levels in 2010 and 2011, although there were changes in the availability of particular plan benefits (e.g., hearing and vision).