I am not going to trash Mayo, but the are not god-like by a far stretch.
I live in St Augustine and was going to a Mayo Primary Care facility here. There is a large Mayo facility 1 hour north in Jacksonville, Fl.
The problem with my right arm was completely mis-diagnosed..chalked off to being a tennis elbow problem and the best cure was 6 months inactivity and then weight strengthening. As it turned out, I had a severely torn rotator cuff and made it accutely worse with the weight training and eventually suffered like a dog for 4-5 months after the correct diagnosis and extensive surgery to repair it....bone grinding, cutting off tattered muscle, sewing two rips, six screws, etc etc.
I do not think it is quite honest to state that UCLA Medical Center spends twice that of Mayo. Housing in CA is four times that of Minnesota. Everything is more expensive in CA. Health care costs cannot be compared evenly when everything else has a higher cost in CA than the national average. Just to pay for the land and expansion projects in CA requires higher costs attached to services.