Medicare Supplements, otherwise know as Medigap Policies, are designed to pay some or all of the costs that Medicare does not cover. There are many different Medicare Supplements that are arranged in coverage by plan letter. Currently the plans range from A to N with the G and F plans being the most popular with the highest level of coverage. All Medicare Supplements are standardized and offer the same coverage between companies. Cost is usually the only difference between Medigap policies with the same letter sold by different insurance companies.
Medicare Advantage provides coverage within Part C of Medicare in the United States. Medicare Advantage health plans pay for managed health care based on a monthly fee per enrollee, rather than on the basis of billing a fee for each medical service provided, which is the way Original Medicare parts A and B work.