Oh my goodness. Avoid. Avoid. Avoid. Had to go here in April of 2014 and remember having trouble with administration. They scheduled me for an appointment without letting me know and then called me the day before (which was the day before Christmas Eve and I wasn't even in the state) to confirm! They were hostile when I asked to reschedule as I hadn't been made aware of the appointment date. The next time they could see me was in April. Now, over TWO YEARS later, I have JUST received a bill from a collections agency for my April 2014 appointment. I have received no prior bills. I called AZ Endocrine Institute 7 times and left a message each time. It took two full days for their billing lady to get back to me. She was incredibly defensive on the phone from the "hello". What a nightmare.