Medicare Advantage plans, or Medicare Part C, combine traditional Medicare coverage into a single plan. Private insurance companies administer Advantage plans, and these plans can include Part A, Part B, and Part D coverage. On the other hand, Extra Help is a financial assistance program designed to help low-income individuals with costs related to their Part D plans. Extra Help is not a type of coverage; instead, it is a federal assistance program that helps cover the cost of part of your Medicare coverage.