55 million 55 million people 55 million people 91 percent of Medicare enrollees 91 percent of Medicare enrollees 91 percent of Medicare enrollees $721 Billion Medicare budget in 2017 55 million people $721 Billion 91 percent of Medicare enrollees 91 percent of Medicare enrollees 91 percent of Medicare enrollees 91 percent of Medicare enrollees $721 Billion $721 Billion