Let me give an example of the billing issues American's face.
Last employer I paid around $9,100 annual ($350 every 2 weeks). This plan had a $6k deductible with no coverage until that was met, then a $6500 OOP (out-of-pocket) max. So the insurance company was guaranteed to get $15,600 before they paid anything outside of "preventative care".
Now, unfortunately, the insurance company had me under a totally different plan, with a 7300 OOP max. Since I don't pay them, I pay my employer, I have to deal with my incompetent HR dept to get this fixed. They not only don't fix it, they somehow split my family so the member with the majority of expenditures is now on the correct plan, but everyone else is on a different plan. This causes the insurance company to claw back payments to doctors and bill me for old services, around $400.