Medicare Advantage, also known as Medicare Part C, is a type of health plan offered by private insurance companies that provides the benefits of Parts A and Part B and often Part D (prescription drug coverage) as well. These bundled plans may have additional coverage, such as vision, hearing and dental care. Unlike Original Medicare, Medicare Advantage plans have an annual limit on out-of-pocket costs. Medicare Advantage plans are typically HMOs or PPOs and are available only in certain areas.