Kaiser Family Foundation http://kff.org/medicare/issue-brief/an-overview-of-medicare/ Medicare Advantage $109 per month An overview of Medicare approximately 55 million people www.kff.org/medicare/issue-brief/an-overview-of-medicare/ Medicare Advantage An overview of Medicare 17 million over the past decade, approximately 55 million people http://kff.org/medicare/issue-brief/an-overview-of-medicare/ approximately 55 million people