As of January 1, 2016, Medicare's unfunded obligation over the 75 year timeframe is $3.8 trillion for the Part A Trust Fund and $28.6 trillion for Part B. Over an infinite timeframe the combined unfunded liability for both programs combined is over $50 trillion, with the difference primarily in the Part B estimate. These estimates assume that CMS will pay full benefits as currently specified over those periods though that would be contrary to current United States law. In addition, as discussed throughout each annual Trustees' report, "the Medicare projections shown could be substantially understated as a result of other potentially unsustainable elements of current law." For example, current law effectively provides no raises for doctors after 2025; that is unlikely to happen. It is impossible for actuaries to estimate unfunded liability other than assuming current law is followed (except relative to benefits as noted), the Trustees state "that actual long-range present values for (Part A) expenditures and (Part B/D) expenditures and revenues could exceed the amounts estimated by a substantial margin."
If you decide to sign up for a Medicare Advantage plan, you may want to shop around, because costs and coverage details are likely to vary. Our obligation-free eHealthMedicare plan finder tool on this page lets you see all available Medicare Advantage options in your area, including a list of coverage details once you click on the plan of interest.
Medicare Part B premiums are commonly deducted automatically from beneficiaries' monthly Social Security checks. They can also be paid quarterly via bill sent directly to beneficiaries. This alternative is becoming more common because whereas the eligibility age for Medicare has remained at 65 per the 1965 legislation, the so-called Full Retirement Age for Social Security has been increased to 66 and will go even higher over time. Therefore, many people delay collecting Social Security but join Medicare at 65 and have to pay their Part B premium directly.