That is true, IMO.
But it is not what I am ranting about.
My rant, and my pet peeve, is this: When you do the initial enrollment nowhere do they (they, being the entire medicare industry) tell you, in as few words and as few sentences as this: If you choose to go with a Medigap (Supplement) you should plan for and be prepared to stay with the same Medigap (Supplement) Plan, F G K L M N, and same carrier, Aetna, UHC, MoH etc., for the rest of your life. You can try to change plans or carriers or both however there are roadblocks in attempting to do so. The roadblocks are not regulated or agreed to, the carriers decide what they are.
I see Cone Este posted you have to answer a questionnaire, i.e., underwriting.
My take on the use of an underwriting questionnaire is it is not mandated or regulated, it amounts to common practice among all the medigap insurers. At this point in time.
Can you count on an underwriting questionnaire still being common practice 5, 10 or 15 years from now? The carriers could change common practice, for example to require a complete physical. Or you could be in the situation of having been using a Medigap supplement for ten or 15 years, meaning you are age 75 or 80. Is it realistic to believe the carriers are going to welcome with open arms every 80 year old who comes along and decides he or she wants to switch plans to save on premiums? "Sure, come join our insurance pool we want as many 75 or 80 year olds as we can get."
Reference for this is on medicare.gov:
Can I change my Medigap policy?
The one exception to all this is the seven states (eight if you include IL with a specific carrier) having the continuous GI rules, or the birthday month or anniversary month GI rules.
If my take on this is wrong feel free to go ahead and say why.