A Medicare Supplement Insurance Plan is used with original Medicare. Any caregiver that accepts Medicare will take a Medicare Supplement Insurance Plan because they only need to bill Medicare. Medicare pays their part (generally 80% of Medicare covered benefits) and sends the remainder of the bill to the Supplement which pays their part (generally 20%). It is important to note that Medicare Supplement Insurance Plans do NOT include Prescription Drug Coverage (Part D, PDP) and for those that do not get a PDP when first eligible there will be a penalty when they do get a PDP. (there are exceptions to this) A Medicare Supplement Insurance Plan does not change year to year (although the cost does generally go up the coverage does not change).