Ah, I hadn’t grokked your previous posts. So Medicare did (does) cover it under Part B, despite all the hoopla on the Twiist web site, and of course that means the TCO with a reasonable supplement (I have Plan G) is $257, or whatever the 2026 number is before the supplement kicks in for the rest.
Thanks for the correction; my bad I didn’t think it through; I was more interested in the Libre 3 at that point.
The medigap plan provider doesn’t matter; it’s the plan letter that matters. Even then it doesn’t affect coverage, it only affects payment. IRC Plan C (I think that’s still available) and Plan G cover 100% of the Plan B costs (20% of the total, after the Plan B “deductible” is met).
This has the attraction that insulin is also covered and, since everything goes on Part B, the CGM is too.
Well, that gives me something to talk to my endo about next appointment 
Yeah on the +/-20mg/dL; I’d never calibrate a Dexcom with such a small error!