The doctors I have dealt with from Riverside have been more than adequate. Be aware that their billing system is very user-unfriendly. They use this 877 number to process payments and after waiting on hold 20 minutes, I was told by "Dennis" that I had to be transferred to another area for Riverside billing. This other area does not have a separate phone number so I waited another 20 minutes before I got "James" who took my payment. I also asked if it was possible to directly dial Riverside people and he did not think so, I asked to talk to the supervisor, he put me on hold and said that he was "in a meeting" but would call me back, "Moses" still has not called me back 3 days later. I will not use Riverside unless they can process my payments.