Excellent MD. Exceptional. Personable and up to date on things. Summa cum laude add more things to post

Dr. O'Brien is so thorough and his staff is super nice! He is no longer in-network for me, but I would rather pay out of pocket costs than go see anyone else! read more

Dr O'Brien is the best! He's very knowledgeable, caring, attentive, he takes his time with his patients. His office staff is great! I have only good things to say about Natalie and Mayela. My family is very lucky to have Dr O' Brien as our family doctor read more

Dr O'Brien and his office staff are great. He really takes the time to listen to his patients and explains his plans as well as the reasoning behind it. There is no sense of being rushed or ignored. The staff is also very accommodating and helpful. Most people don't like going to the doctor's appointments but they make the experience as pleasant as one can. read more

Dr O'Brien is everything you think of in a great doctor: kind, compassionate, truly caring, takes time to listen, experienced, and really knows his stuff. He has been my general doctor for many years, and I just hope he never retires. read more

I've been a patient for years and am so lucky to have such a good doctor that takes such good care of me. He calls in my blood test before my appt time so we can review it during the checkup. I highly recommend him. read more

Dr. O'Brien BEST MD! He was the doctor we selected for my husband's parents about 10 years ago. They are now age 91 & 89. Then my husband & I had periodic health issues so we sought his advice and treatment. He is such a smart internist. He takes pride in listening to the patient, asking excellent questions, and analyzing what would be the appropriate course for treatment. I've never seen a doctor be more conscientious and dedicated to his patients.he really has become our 'family doctor '. He coordinates with our cardiologists & other specialists without having to request it. He calls us back personally, we can reach him after hours when needed. He REALLY CARES about his patients. read more

This review is for Dr. James O'Brien. He is very knowledgeable and easy to talk to - he takes his time with you and doesn't rush you through like other offices. I believe the practice is relatively new and he is readily accessible. I have never had to wait more than 10 minutes to see him and he will even call in your referrals while you wait. Good guy! read more

I was new to Irvine and by luck, was recommended to Dr O'Brien. Im very happy with his service, and share many of the positive experiences already posted here in his previous reviews. Highly recommended. read more

Dr James O'Brien has been my Internist ever since I moved to Irvine 7 years ago. He is a wonderful doctor & very compassionate and helpful in every way. Great doctor and will not hesitate to recommend him. read more

Dr O'Brien himself is a nice guy, however his staff answering the phones is very rude. Twice I have had simple questions which would have required less than 2 minutes on the phone and each time I was told I needed to make an appointment. I have had the Dr as primary care for many years only to be mistreated by his staff over the phone repeatedly. This last time it was important for me to speak with the Dr and just like the first time I did not get a call back. I am not entirely sure that he ever received the message either time. I am moving to a new Dr who's office will show more care/interest/respect for their patients. Sorry Doc, you have the wrong people working the office. read more

Had my first appointment with Dr. O'Brien today. The nurse/receptionist I spoke to on the phone managed to squeeze me in to see the Doctor the same day I called, she was very polite and helpful. Check in was easy and Doctor O'Brien was excellent, I never felt rushed and he was very thorough. My husband (who's also Doctor O'Briens patient) was with me and Dr. O'Brien even offered to do a physical on him too, how awesome is that?!?!? read more

I have been with Dr. O'Brien for 5 years now. He is the best doctor. Very compassionate and takes his time to listen to you and never rush you. Dr. O'Brien is a true healer! read more

Dr.O'Brien is one of the most compassionate, knowledgeable and caring doctor that me and my wife have seen in recent years. He is very easy to talk to and puts you at ease right away. He takes detailed notes, entertains questions about your health at all levels and makes recommendations for any concerns that you bring up with him. His office staff are also very efficient and easy to interact with. We feel very fortunate to have found him and have started to have implicit faith in him. Great guy! read more

Dr O'Brien is a very thorough Dr. He listens to his patients and is very detailed. i would give him 10 stars if it were an option

Dr. O'Brien is an outstanding Dr. He has great bedside manners, he is thoughtful, he is knowledgeable, competent & he listens. I am an elderly man & have not met anyone like Dr. O'Brien. I highly recommend him. Nick read more

Dr. O'Brien is still the best. I just saw him again last week and NOTHING HAS CHANGED! Just a good guy, all around. In fact, a few years back I had a pretty big medical issue that required a few specialists. Upon getting my diagnosis on NYE, I called Dr. O'Brien to leave a message about what I had learned. The guy called me back! He happened to be in his office/clinic, and told me to drop in even though he wasn't open for patients. We talked for about an hour and he said he'd follow up. Sure enough, he called me to see how I was doing. Not his staff. He called personally. Just another example of why he's earned 5 stars from me! read more

Dr O'Brien has been my physician for the last six years and he always listen to me carefully and if I need any other consultation from specialists, he always accommodate. Thank you Dr. O'Brien. read more

Dr. O'Brien has been my doctor for over 12 years. He is caring and very intelligent... I would highly recommend Dr. O'Brien to anyone...

Dr O'Brien and staff don't care to assist those who file bankruptcy due to unforseen circumstances. Dr O'Brien had thought that my bankruptcy was due to money mismanagement, however he was very far from the truth. I had a stroke recently and owed greater than $300,000 to the larger hospital that treated me. I tried to pay this for a time but it was too great a financial burden, leading my family. close friends, and financial advisors to suggest filing for chapter 7 bankruptcy. The bankruptcy cleared. All debt was discharged. I got through rehab, regained motor skills, and got into a new wonderful job as an IT professional for a health care company. Unfortunately, the discharge of that huge ER bill would also discharge a very small portion that was owed to Dr O'Brien's office (less than $150) for services rendered while I was rehabilitating and attempting to pay the greater ER bill. For this, they refused to continue having me as a patient unless I paid the amount in full, cash only. I tried to explain to him that when filing for Chapter 7 , you are instructed to not pay on any existing debts until the bankruptcy is over. Even if you go through a bankruptcy, for a traumatic, unforseen experience, his office still expects you to pay 100% what you owe and will not budge to work with you in restoring finances. I wasn't looking for free service, nor was I mismanaging my money (as Dr O'Brien accused me of). I was simply doing what was legally instructed to me. I could have payed for office visits normally moving forward beyond the bankruptcy, but his office couldn't move passed the small bill that I had incurred with them........ during my time rehabilitating from a stroke. They were unwilling to negotiate. read more

I heard from a friend that Dr. O'Brien is a great doctor. I was looking forward to visiting his office. I called to schedule an appointment and gave the scheduler my insurance ID. She calls back to say that I have a HMO and cannot make an appointment. I tried to tell her that I do not have a HMO and can make an appointment. She didn't listen well - did not make an effort to check again. I then call my own insurance company directly and the insurance company rep confirms that Dr. O'Brien is in my network and I can see him. My insurance company rep then calls Dr. O'Brien's scheduler to tell her that I can be a seen at this office. Then Dr. O'Brien's scheduler calls me back and confirms that I can be seen at his office. In summary....I won't be a new patient at his office. I am looking for an office that has a good doctor and a good scheduler. If I were running a business and a potential new customer informed me that s/he could compensate me appropriately, I would make every effort to work with this person. The scheduler could have just picked up the phone and called my insurance directly instead of me. It's that simple! On to the next doctor! read more

Just double check with another doctor after visiting Dr James O Brian. I had a misdiagnosis from him which cost me $3000. if he pushes you to do the test right away and go to Hoge Hospital, please don't do that and check with another specialist to make sure he is right. read more

Dr. O'Brien has been my GP for several years now. I can't begin to tell you what I great doctor he is. Compassionate best describes him.

It is because of Dr. O'Brien that i got an early diagnosis of my prostate cancer. My previous doctor just gave me a puzzled look when he saw my abnormal PSA test result. Thanks to Dr. O'Brien's referal. I was able to get the proper care I needed to treat my prostate cancer. read more

Staff is rude and they do not work with you. They will not even mail a copy of your report to your address. They want you to come in for an appointment with the doctor even though your report may not require consultation. They want you to pick up the report or fax it - who uses a fax machine in this day and age. They will not even guarantee that the doctor is going to call you back - because the doctor calls back if he decides to call back. read more