Is there a limit to how much your out of pocket costs are when you go to a doctor or need hospital care?

There is no limit to your potential out of pocket costs if you only have Medicare Parts A and B. Medicare Advantage plans (usually HMO’s or sometimes PPO plans) will limit your financial liability especially if you go to in network providers. On the other hand, Medicare Supplement Insurance plans do not have networks and will protect you from large or even huge out of pocket cost.