Kaiser is special compared to others on that list, because it also provides the facilitiea and doctors.

They can't directly impose things on doctors, but they provide bonuses for saving company money.

So while the rejection rate is low, doctors are far less likely to choose new treatments that might be better, because they cost more.

For example if you have an auto immune disease in Kaiser the doctor will see less problem keeping you on DMARD and NSAID medication instead recommending biologics than doctors in other medical groups.

Because it was cheaper?