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In the past, Medicare+Choice plans had year round enrollment (prior to it being called Part C).
They (the carriers) were also allowed to make mid year improvements to their plans. So, if their benefits were sub-par for the area, they could make mid year improvements.
Medicare tried in the past (I think around year 2000) to do the lock in like they have now. AARP voiced their opinion (which was no) and they overcame it. I am surprised that they allowed it this time.
A SEP for doctors leaving the network would probably be the closest thing they will get for changing plans. That is probably one of the reasons PPO plans are becoming more and more popular.
Although I don't know of any concrete examples of it occurring, I do know that with PPO plans there are circumstances in which out of network providers can be considered in network by the plan. But the member has to contact the plan first, certain conditions have to be met i.e. no other specialists within a certain radius, etc.