For example, I had need for a medical device. My doctors office submitted the claim for that device with documentation of it's necessity 5 times over 6 months before it was finally approved. The prior 4 times it was "You didn't include all the required information" even though each submission was identical.
There's simply far too little oversight on insurance agencies. They are perversely incentivized to give the worst outcomes for everyone which being to command high premiums because of the relatively low amount of competition or threat of "switching" (After all, you are using your employer's insurance. You didn't get to pick it, HR did. And they picked it based on who's cheapest. How did they become the cheapest? A race to the bottom in terms of service).
All of this burdens the whole system with cost and delay.
I'm all for universal healthcare, but if we can't get that can we at least get stronger regulations and punitive measure against insurance companies for playing these games? It's crazy that everyone has stories, regardless of agency, of illegitimate claim denials.
And to be clear, they do this because it saves them money and costs them nothing. By denying by default, a certain percentage of the population and doctors offices will ultimately just go away because of the headache it takes to convince the agency to provide the product you pay for.