> If this is correct, then how come there are so many complaints about insurance denying payment for healthcare or the hoops they make patients and doctors jump through for pre authorizations?

Because those anecdotes get reader and viewer engagement. Charts comparing how much U.S. insurers pay on average for common procedures compared to, say, the UK NHS, don’t drive forward the narrative.

You should interrogate the media sources you consume and ask why you’re fed so many stories like that, and investigate what the real data is. A few years ago my friend got a continuous glucose monitor for Type 2 diabetes. I looked at the coverage polices for continuous glucose monitoring (for Type 2) for my insurer and some of the other big ones. Turns out that most US insurers, Medicare, and Medicaid in 45 states+DC cover continuous glucose monitors for people who have type 2 even those that don’t use insulin. At the time, most Canadian provincial systems didn’t cover the technology except for Type 1 or people who take insulin. UK NHS was worse, covering it only for Type 1, or Type 2 with certain conditions (such as you’d otherwise need to do 8 or more pin prick tests a day). https://www.diabetes.org.uk/about-diabetes/looking-after-dia...