In 2015, 17 of 54 million Medicare beneficiaries nationwide receive their Medicare benefits from Medicare Advantage (MA) plans. MA plans are private managed care organizations that contract with the federal government to coordinate care for Medicare beneficiaries who choose to enroll. MA options are available to beneficiaries in more than 3,000 counties throughout the nation. While MA enrollment has grown significantly in recent years, 37 million (or two-thirds) of Medicare beneficiaries still choose to receive their benefits from original Medicare, also known as fee-for-service (FFS).