Unexpected medical costs can add up quickly without the right insurance coverage. When Original Medicare (Medicare Parts A and B) doesn’t cut it, explore the option of a Medicare Advantage plan. Unexpected medical costs can add up quickly without the right insurance coverage. When Original Medicare (Part A and Part B) doesn’t cut it, explore the options of a Medicare Advantage plan. A Medicare Advantage Plan, also known as a Medicare Part C, is a type of health insurance offered by private insurance carriers approved by Medicare. Medicare Advantage Plans must cover all the benefits of Original Medicare Parts A and Part B, and most include prescription drug coverage (Part D). Most Medicare Advantage plans offer additional benefits not typically covered by Original Medicare, such as vision, dental and hearing.