i had a referral from my primary care physician for dr. mcquire, as i had used him before for my…read moreproblems. upon getting the referral from my insurance in december, i called for an appointment. they could not see me until march 17th. i didn't ask any questions, as his staff and i have had issues before, i accepted appointment. on march 16th i received a phone call from "robbie" one of his office girls. she left me a message of what i have been diagnosed with and told me i have the wrong doctor..so she apparetly overrides my primary care doctor attempting to get me help wih my stomsch issues, she is fully aware i was his patient but cancelled my appointment andcsaidvto see a rhumatodologist..which i already have. referrels do not state your diagnosis but only the referring to the doctor referred to. ribbie at one puntbwhen my doctor was on vacation and refused to get my percsription for xanex refilled and i had to fight. xanex is a scary drug and i had been takng it for 2 years. the doctor i was using came back and refused my refill. prescribed a medication that should not have had as does not mix well with other prescriptions, thus rendering me extremely ill for several weeks. this revenge attitude is not something that one should not have to put up with. she works there as customer service and her liking or disliking a patient should stay at home. i am filing a complaint with my insurance, the state health departmentv against the dr. license.

Dr. McGuire has performed endoscopies and colonoscopies on all four of us. He, unfortunately,…read morediscovered colon cancer in my late husband and eldest son. He was instrumental in the treatment of my husband and referred my son to the City of Hope. His professionalism is excellent as are his skills. In addition, he genuinely cares about his patients. There is nothing impersonal about his care. I do not say lightly that I trust him with my life. No, he doesn't walk on water. Among all the physicians I've been exposed to he is what I would call the best. How many doctors take time out of their schedule to attend a Celebration of Life Service for a 32 year old patient who lost his battle with colon cancer?

Hepatitis C Dr…read moreChapman was my Gastroenterologist for over 30 years. He always listened to my concerns. He always went over my results from medical tests and explained the numbers. My Hepatitis C was stable and clear in June 2018. He is a great and compassionate Doctor and I will always appreciate him. The office staff are very nice and helpful.

The doctor seem to be very knowledgeable. The staff on the other hand is so overworked their…read moreworkload they can't handle so if you're needing anything urgent definitely go find another office. I have a referral that was approved six months ago and I still haven't gotten the appointment scheduled for my procedure glad it's not too urgent.

Dr. Keith Martin is a fantastic doctor!…read more He had done my previous two procedures, so I knew I'd be treated really well. He was kind, patient, very knowledgeable about not only my medical issue, but gave me the information to deal with what is a scary medical situation necessitating two procedures on the same day at the same time. He's very personable and professional, PLUS I got the notification of his initial assessment in my email really quickly.

After Dr. Martin ordered blood work, I had the tests done but never received a call with my…read moreresults. I've left two messages over a three-week period with no response. The lack of communication is unacceptable.

Dr. Mortensen is one of the best alternative healthcare practitioners I have had the pleasure of…read moreworking with. He has helped me tremendously through debilitating gut and health issues. Before finding Premier IFM, I had visited several conventional doctors but was unable to get clear answers. Dr. Mortensen took the time to investigate further by ordering comprehensive bloodwork, gut testing, and mold testing, which revealed longstanding gut dysbiosis and elevated mycotoxins. With his guidance, I began addressing these underlying issues and experienced meaningful improvements in my overall health. I want to be clear that I had preexisting gallbladder problems before becoming his patient. I eventually discovered that my gallbladder was severely infected and required emergency removal. This was not caused by any of the therapies or supplements Dr. Mortensen recommended. In fact, I believe his care helped strengthen and support my body leading up to the emergency. The ER doctors were amazed by how healthy my bloodwork looked before the procedure, despite the severity of the infection. I am incredibly grateful for Dr. Mortensen's knowledge, thoroughness, and dedication. His recommendations played an important role in improving my health and helping my body handle a serious medical emergency. I highly recommend him to anyone searching for a practitioner who genuinely listens and works to uncover the root causes of their health concerns.

Dr. Mortensen helped me a lot with my health over the years. After years of debilitating pain and…read moresuffering he uncovered the root of my ailment and helped me on my journey to achieving optimal health.

I had an upper endoscopy this morning and it could not have gone better. The staff was pleasant and…read morethe wait was minimal. Dr.Brian Riff answered my questions completely and provided expert opinion. Dr Bogdan Popa's anesthesia was magically and I woke up feeling rested and relaxed. Highly recommend this center and will be coming back for my colonoscopy.

Brought a family member here for a procedure and had a great experience overall. Naina at the front…read moredesk was so great at communicating every detail we needed to know beforehand. And nurse Diane was so helpful and communicative post procedure as well. My loved one felt in good hands and received great care at this facility. It's an older building but very clean and the staff are efficient. 5/5 for professionalism and bedside manner from all the staff. Thanks!

I recently went to see Dr. Yoo for a colonoscopy. I found him through my insurance company website…read moreand saw that he was located nearby in Rowland Heights. When I called to make my appointment, I found out that Dr. Yoo moved his practice to a new building in Diamond Bar as of March 2024. Dr. Yoo's new office is located in the newly renovated Diamond Bar Medical Plaza, which was previously a Chuck E. Cheese (if you all were in the area when that was around). Looks like they are still in construction, as a couple offices are still vacant with plastic on the glass windows. The staff I encountered all very friendly and nice. Dr. Yoo was professional and clearly explained the process and indicated what I needed to do to prep for my procedure. I came in on a Monday and the front staff was able to fit me into an appointment on Thursday due to a last minute cancellation. This kind of procedure is not fun, but the entire staff made me feel comfortable the entire time, and the nurse who attended to me was so nice, I felt like my mom was taking care of me. =) She made sure I had extra blankets because I was cold and came by a couple times to made sure my IV was ok. I got a call the day after to follow up and see how I was feeling and if I was experiencing any issues. I appreciate the check in even though I was feeling good! I highly recommend Dr. Yoo if you need an gastroenterologist.

Excellent experience from start to finish. The doctor thoroughly reviewed all the preparation steps…read morebefore the procedure and made sure I knew exactly what to expect. The staff was friendly, professional, and made me feel comfortable throughout the visit. Everything was well organized, and I received outstanding care. Highly recommend!

Last time I checked doctors need to physically exam patients in order to properly diagnosis. So you…read morecan imagine my surprise that Dr. Matthews isn't seeing patients and will only do phone calls. I've currently been on hold for 15minutes!! Oh and did I say they NEVER called to share test results done over a month ago. Let me save you time and energy, don't pick Dr. Matthews. Well at this point don't pick St.Judes

DO NOT SEE DR. SCOTT SAINBURG!!…read more Completely rude and judge-mental. I was admitted to the ER prior and the doctors wanted a GI to do tests and look at me. He refused to do any test. Refused to look at the medical records. Claimed the ER doctors know nothing and it would be useless to look at their findings. Then he did nothing but lecture me on life. The whole time looking me straight in eye with a smirk, like he was waiting to see my reaction. Like he enjoyed it. Not only was he rude and unprofessional, he kept asking questions about my personal life totally unrelated to the medical conditions. I have filed a complaint with the office manager, my insurance, as well as my primary physician. I'm hoping to stop anyone from seeing him until he gets treatment or changes his behavior. He did nothing to help nor did he even try.