Medicare supplement experts here? [View all]

If I have a supplement with any company, it will auto renew each year with of course a higher premium, correct?

What if from the time I started Medicare and a supplement to next week when I am shopping supplement prices (not advantage, I wont do that crap) I have a new diagnosis, for instance CKD-Kidney disease. Let's say I have that now and didnt when I started and I have had the same company/supplement from the beginning:

1. can my current carrier make any changes at all affecting my coverage based on this new diagnosis (answer has to be no but I will ask)

2. if I were to change to a new carrier's supplement, and they ask if I have CKD and I think they do, then what happens when I say yes?

thanks