There are a gazillion insurance policies out there. You would need to figure out what policies are potentially available to you, and then see if you can get info regarding whether or not they cover revisional bariatric surgery at all (many don't) and THEN figure out what their criteria are for revisions (often more stringent than for a primary bariatric operation) and THEN figure out if they covef revisions specifically to the DS...you get the idea. This isn't something we can sort out for you, you need to do some research yourself. AND, don't trust anything someone tells you over the phone (yes of course we cover bariatric surgery!) because that doesn't mean you will be covered for the very specific operation you want.
Of equal importance, most DS surgeons don't do revisions of RNY to DS, because it's a complex, challenging operation with a significant rate of risk. I say this not to discourage you, but to advise you that you need the right DS surgeon, and you may need to travel, as many people do for this type of revision. If you can accept that reality now, it will help. There is a list somewhere on this website of the surgeons we know of who do these revisions.