Folks, I know this is disruptive, and I don't like it when things like this happen to me either.
However, I must point out that we (the public collectively) are responsible for these sorts of annoyances, not the insurance companies.
These forced changes, and the elimination of choices, is due to our relentless pressure on health care costs. I'm not saying that's bad, just pointing out the facts.
The bottom line, in everything, is choice has a price.
Many don't understand why an insurer will cover one analog insulin, and not another. They're basically the same thing from a functional standpoint, right? Same with test strips. Needles. On and on.
What gives here is, in an attempt to keep costs down and meet their customer's demands for quality and price, insurers contract with suppliers. Suppliers compete for these contracts. These contracts are exclusive -- the insurer (and the insurance customer) negotiate the lowest cost possible, and the supplier gets a predictable, exclusive market in the insurer's customer base.
I really get fed up with so many people viewing this ordinary, quite ethical functioning of the health insurance market as some sort of nefarious, evil behavior by insurance companies.
Really, I have little patience for those that want the cheap ticket but first-class service and accomodations. There is insurance that gives wide-ranging choice in all aspects of health care (at least there used to be -- the ACA is eliminating that option), it's just very expensive. Insulin bought retail without contract is much more expensive -- more than 2x. Plans that allow you to choose whatever brand of medication, test strips, etc. you want pay retail or simple discounted retail. The cost to cover people with such insurance is much higher, and so are the premiums.