You are right--Doctors absolutely share blame. Take my dentist's behavior, for example. When the oral hygienist is done doing all the real work, my dentist sits down for 10 minutes to count my teeth and say the words "You should floss more." She bills $85 for that sentence and calls it "Oral hygiene instructions". My insurance company (IMO rightly) denies paying for this. It's ridiculous and the dentist knows they're going to call bullshit on it, but they bill it anyway, and then I'm technically on the hook to pay for it. So far, the dentist has not yet attempted to balance bill that charge, and I will drop them like a bad habit if they ever do.

I'd imagine you'd struggle to find a healthcare system in which a doctor's prescribed care is assuredly covered by insurance, by the insurance provider, and then later rescinded after care has already started.

There are many health systems in the developed world, though, where the system doesn't make this the patient's problem. It shouldn't be possible to have a scenario where the provider believes eight weeks of treatment will be covered, the patient moves to an inpatient facility based on this understanding, and then the bureaucratic review layer decides six days layer that the provider was wrong.

The goal should be to provide every human being with the best care possible. If a system can't handle that, then we need to assess why and make changes.