Medicare Advantage

Medicare Advantage (sometimes called Medicare Part C or MA) is a type of health plan in the United States that provides Medicare benefits through a private-sector health insurer. In a Medicare Advantage plan, a Medicare beneficiary pays a monthly premium to a private insurance company and receives coverage for inpatient hospital ("Part A") and outpatient ("Part B") services. Typically, the plan also includes prescription drug ("Part D") coverage. Many plans also offer additional benefits, such as dental coverage or gym memberships. By contrast, under so-called "Original Medicare", a Medicare beneficiary pays a monthly premium to the federal government and receives coverage for Part A and Part B services, but must purchase other coverage (e.g., for prescription drugs) separately.

Medicare Resources:
Medicare.gov
Centers for Medicare & Medicaid Services
Social Security Administration 
Department of Health & Human Services