Medicare Advantage Plans are sometimes referred to as "Zero Dollar Plans", because you can typically find one with no extra cost to you.
Lower Cost-Sharing
Medicare Advantage plans typically come with copays for when you receive medical help. Often times there will be certain dollar costs that you are responsible to pay if for example you visit a specialist or have a surgery completed.
Annual Out-of-Pocket Limits
Medicare Advantage Plans typically also come with a "Annual Maximum Out of Pocket". A Maximum out of Pocket is the most amount of money that you can be out for a calendar year (January - December).
Extra Benefits
Medicare Advantage Plans often times come with extra benefits such as Dental, Vision, Hearing, and Over the Counter Allowance at no extra cost to you.