I wouldn’t say that it isn’t true, but I just googled and I couldn’t find it either.
I haven’t looked at the medi-share website for anything like that. I wonder if they have it as an alert to their participants?
If it were true, you or I would have turned it up on a search. My best guess at what happened is that someone posted it, either having mistakenly believed it to be true or knowing it wasn’t. After that it was picked up and repeated because it seemed so likely. I.e.: Ryan, who takes $ from both Soros and the insurance companies, does seem like the kind of person who’d do them a favor. Add confirmation bias and too good to check, and the claim took on a life of its own.