Like Medicare Supplements, Medicare Advantage Plans are private insurance contracts. While Medicare Supplements work within the traditional Medicare Part A and Part B programs, Medicare Advantage Plans must include the coverage provided by Medicare Part A and Part B, but can offer other benefits beyond that.  Typically, these plans offer a mix of benefits to cover deductibles and copays to a lesser extent than the coverage offered by the more robust Medicare Supplement plans.  Beyond that, these Medicare Advantage plans can, and do, offer additional benefits.  Because benefits vary widely, it is difficult to compare different plans.  Some of the additional benefits may include dental, vision, preventative care, membership in health clubs (Silver Sneakers).  Approximately 30% of all Medicare beneficiaries are enrolled in a Medicare Advantage plan.