Some Medicare Advantage plan members feel trapped, finding it too expensive to revert to Original Medicare. How can I get supplemental health coverage for pre-existing conditions if I switch from Medicare Advantage to Original Medicare? Why switching from Medicare Advantage back to Original Medicare can be almost impossibleIf you’ve been in a Medicare Advantage plan for more than a year, you might not be able to get a Medigap plan. It’s very important that everyone with a Medicare drug plan or Medicare Advantage plan reads their copy of this notice when it arrives in late September or early October. When you enroll in Medicare, think long-termMedicare Advantage has grown to where more than 50% of Medicare enrollees are now in Medicare Advantage plans.