# How reliable are CGMs and who cares?

**URL:** https://forum.fudiabetes.org/t/how-reliable-are-cgms-and-who-cares/15975
**Category:** C/GM
**Tags:** dexcom
**Created:** [April 4, 2026, 12:28am UTC](https://forum.fudiabetes.org/t/how-reliable-are-cgms-and-who-cares/15975 "2026-04-04T00:28:37Z")
**Posts on this page:** 1
**Showing post:** 14

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### Author: ![jbowler](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@jbowler](https://forum.fudiabetes.org/u/jbowler)
#### Post date: [April 5, 2026, 11:50pm UTC](https://forum.fudiabetes.org/t/how-reliable-are-cgms-and-who-cares/15975/14 "2026-04-05T23:50:10Z")

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> [@John58](#):
>
> The [twiist] is looking like a long term project for me because my Medicare Part D insurance requires a formulary exception to cover it.

Yes, that’s what I thought, but then @andrea8 's experience with Medicare and getting twiist covered under Part B turned up… Here’s Andrea’s original post:

> [@I'm Twiisting!](https://forum.fudiabetes.org/t/im-twiisting/15838/16):
>
> I have Medicare and Medigap through Empire Plan. My first kit of twist was free, but they do that for everybody. Now it’s 60 a month co-pay..

Then here is the clarification; I’d made all sorts of assumptions about the original post but the worst was that Andrea was on Part C… This corrected my misassumptions:

> [@I'm Twiisting!](https://forum.fudiabetes.org/t/im-twiisting/15838/33):
>
> My Twiist kit costs $582 a month and I pay $60 copay insurance. My supplemental coverage (UHC Empire plan) pays for the Twiist stuff entirely. I would not have tried it had it not been approved for coverage. I have been using it since 10/25 and have had some problems….highs that wouldn’t go down and a few lows…..some while sleeping (43) which i slept thru and lived. I would not have tried it had I not had an iPhone and already using a Libre 3 plus CGM. My overall blood sugar has been much l…

So Andrea is using twiist on Part B and has a Medigap (“supplemental”) which ends up covering it. Medigap if correctly chosen covers all Part B expenses after the deductible ($283 this year, 2026). Here’s my summary (after I’d worked out my mistakes):

> [@I'm Twiisting!](https://forum.fudiabetes.org/t/im-twiisting/15838/37):
>
> 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 th…

This, finally, is all reasonable. twiist, despite the Tech Bro denial, is clearly a durable pump, so clearly a Part B item. This is ~great~super.

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