[NYGUY]

Originally Posted by Dan9871

I believe there are "life event" exceptions that require an insurer to accept you if you transition from advantage to regular supplemental. For example if your advantage plan goes away or you move to an area not covered by it.

Medicare calls it "guaranteed issue rights"... here is a link

guaranteed issue rights | Medicare.gov

I believe this is the correct answer. You can only go from an Advantage Plan to Medicare +Supplement if you qualify under one of the Life Events.