Thunderbird location. The doctors are ok. The office staff rude but what I'm really upset about is their billing company. I always use my bill pay feature from my bank to pay my husbands bill. This time CVC returned my check to my bank with no attempt to cash it and no explanation. I thought this was strange but probably an error so I double checked the mailing address and account number in bill pay and resent the check. Two days later I get a letter threatening collections! Yes, on hot pink paper no less. My husband calls the number on the letter and is on hold for 3 hrs and 42 mins. (Don't ask) I finally convince him they are closed and to hang up. I called today explaining what happen (they refused my perfectly good check) and to please call me. No return call. If they refuse this one they will not get another and they will lost a patient.