Patients are treated like cattle and seems to be more concerned about getting your money than providing caring and personal medical care. Here is my experience as to why I would never recommend or go to this doctor: 1) Waiting room is tiny, always over crowded, and not enough chairs. The chairs they do have are squeezed into the tiny lobby and has a loud, blaring TV hanging on the wall. My brother, also a former patient, is 6'9" and has hit his head on the TV several times. 2) Office staff is rude, non-accommodating, unhelpful, and stupid. Only care about their administrative process, such that it must be adhered to or you can't make an appointment. I never got to see the doctor or become their patient because they threw away my referral from my doctor. Apparently, they throw away referrals after 30 days if you don't make an appointment within this time. You have to wait for them to call you for your first appointment--so if you call before they call you they won't make an appointment. Their process must be followed. They have no flexibility or care about your schedule. 3) They ONLY TAKE CASH So you must visit an ATM before your appointment--not very accommodating or customer focus. They do bill your insurance, but any co-pays or self pays must be paid at your visit and if you don't have cash you can't see the doctor even though you took time off work or whatever to see the doctor. This staff and doctors clearly are not in need of new patients or care about the existing ones, nor do they make them feel they care about them, rather they are money hungry and only want patients that follow their administrative processes' correctly. Needless to say, I will NEVER go to this doctor. They also LOST TWO EXISTING PATIENTS--my mother and brother who both were both seeing Dr. Zheng for the past several years. They now have a new pain management doctor and will never go back to this doctor. Don't bother with this doctor--ask your primary doctor to refer you to another pain management doctor. Good luck and I hope you find a good doctor who makes your pain go away.