There are some types of Medicare Plans that provide health care coverage that aren't part of Medicare Advantage, but are still part of the Medicare Program. Medicare either pays a set amount of money for your care every month to these plans or reimburses the plan's reasonable cost for your care. They provide your Medicare Part A and Part B coverage, and some provide Part D (Medicare prescription drug coverage) as well.
(Primary Source: Centers for Medicare and Medicaid Services - Medicare and You Handbook. This content may have been enhanced by Q1Group LLC to include further examples, explanations, and links.)
Medicare Supplements fill the gaps in your Original Medicare