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    Advanced Gastroenterology

    3.7 (84 reviews)
    Closed 9:00 am - 5:00 pm
    Updated 3 weeks ago

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    5 years ago

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    Gilbert S.

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    3 months ago

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    1 year ago

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    1 year ago

    Care is quick and easy. Staff is courteous and helpful. Was in and out so darn quick today for my FibroScan. Thank you!!!

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    11 months ago

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    2 years ago

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    1 year ago

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    3 years ago

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    2 years ago

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    3 years ago

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    Gilbert S.

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    3 years ago

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    5 years ago

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    Gilbert S.

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    3 years ago

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    2 years ago

    Beware. Costs are astronomical. Do not use this office if your insurance doesn't cover. There are other doctors out there to choose from.

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    5 years ago

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    2 years ago

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    5 years ago

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    Gilbert S.

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    2 years ago

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    4 years ago

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    Gilbert S.

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    3 years ago

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    4 years ago

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    Gilbert S.

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    3 years ago

    Transparency? Is it a joke? Called back to ask clarification. The office told me they don't know what "has nothing offer" means.

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    Gilbert S.

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    3 years ago

    Great staff and really good experience with my most recent colonoscopy. I recommend.

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    5 years ago

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    Gilbert S.

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    7 years ago

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    Gilbert S.

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    5 years ago

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    Gilbert S.

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    3 years ago

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    Gilbert S.

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    3 years ago

    The staff has been amazing. Both the doctors have answered all my questions. DR.Simoni make you feel really comfortable.

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    5 years ago

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    Gilbert S.

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    7 years ago

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    3 years ago

    Very responsive and helpful! Made me feel "heard" and well taken of. I recommend Advanced Gastronoenterology

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    4 years ago

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    Gilbert S.

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    4 years ago

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    Gilbert S.

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    Photo of Sam M.
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    6 years ago

    Great service! Very clean facility always on time love the appointment reminders by text great experience! Excellent staff and doctor.

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    Gilbert S.

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    6 years ago

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    Gilbert S.

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    6 years ago

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    Gilbert S.

    Thank you so much Jody. It has been a pleasure taking care of you.

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    4 years ago

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    5 years ago

    Dr Simoni is a very caring and gentle doctor. He has a very good bedside manner. Highly recommend his services.

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    Gilbert S.

    Thank you so much for your kind remarks.

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    7 years ago

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    Gilbert S.

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    4 years ago

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    Ask the Community - Advanced Gastroenterology

    Review Highlights - Advanced Gastroenterology

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    Alister A George, MD

    Alister A George, MD

    3.2(69 reviews)
    3.1 mi

    Excellent physician. Courteous staff. Nice surgical center. I've been seeing Dr George for about…read more15+ years. I highly recommend him. He is busy but he's worth seeing!! Very through and will solve your digestive issues!

    This is long overdue. Not sure if yelp was around in 2003. Dr George wasn't at his new location…read morewhich BTW sits on an old gasoline lot. His office was at another location. Regardless I remember getting my first colonoscopy at a health south facility. Remember them, I do, from the moment of laying down and having to plead with them to give me anesthesia as they were not sure of the insurance I had would pay for it, thankfully they must have caved, as I don't remember the procedure. Which was the only thing I can be thankful that happened that fateful day. No, when I came to Dr. George came by, didn't stop and dropped off a color photo of a tumor in my colon. I remember asking "what do I do?" He responded on his way to his next procedure "you go to a general surgeon". This was my last interaction/only interaction with Dr. George. Then the nurse informed me that I would likely be wearing a "colostomy bag" going forward. This is 100% how it happened and I was so angry. I was 30 years old and coincidentally this happened on my daughter's 1st birthday. The lack of bedside manner by this POS was mind blowing. I did get my Colon resection by a stud Colon rectal surgeon and wonderful chemo care from a great Oncologist. I'm 54 now and have had dozens of clear colonoscopies and never ever have had this type of treatment. I have had other procedures as well and some that required hospital stays, anesthesia, you name it I've been very fortunate for the care that I've been given. But I'll never forget how pompous and uncaring George was, and I really would encourage you to go to Dr. Daneshagar, who is a lovely man with a local practice.

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    Alister A George, MD
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    Gastroenterology Center of Thousand Oaks

    Gastroenterology Center of Thousand Oaks

    4.2(5 reviews)
    1.7 mi

    I'm a new patient to oak tree surgical team and my experience was truly professional, caring so…read moremuch so to earn them a top notch rating! I will be glad to recommend doctor Daneshgar to anyone who asks. Kudos to you Sir and your surgical staff.

    Dr. Daneshgar and his team are the absolute best. I was extremely sick and had no idea what was…read morewrong with me. I was rapidly losing weight and was in constant pain. I had a colonoscopy for the first time and was nervous about the procedure. Dr. Daneshgar and his team went above and beyond to reassure me that I was in good hands, and I was! His staff was so incredibly kind and caring towards me that it helped calmed my nerves during the procedure. I absolutely love his staff- seriously the nicest people ever! After the colonoscopy I was diagnosed with severe ulcerative colitis. I was on medication and recovering from home. Every single day (including weekends) Dr. Daneshgar called or texted me asking how I was feeling. Do you know any other doctor who would do that?! He truly cares about his patients and I am so grateful that he is my doctor. BUT WAIT THERE'S MORE! Since my condition was so severe, I was admitted in the hospital. Dr. Daneshagar called the hospital ahead of time and had already secured me a bed and made all the arrangements. All I had to do was check in. Now, I've never been admitted in a hospital before and dealing with a new disease is hard enough and having my doctor with me every step of the way made this entire situation easier and made me feel like I was in good hands. I was in the hospital for 5 days undergoing more aggressive treatment and infusions. Every day Dr. Daneshagar would visit me in the hospital to see how I was doing. He is the most caring and most genuine doctor that I have ever met. He is the best in his field and knows what he is doing when it comes to your health. I am so thankful that I have him as my doctor. I am now at home and feeling 100x better than when I had first met Dr. Daneshagar. A special THANK YOU to your staff!! Carole (thank you for knocking me out-MVP) , Jackie (you're the best, I couldn't have done that procedure without you), Winnie, Teresa, Monica, Lizz and Nayeli. You ladies are amazing and thank you for what you do.

    Niloufar Guiv, MD - Dr. Niloufar Guiv, MD Gastroenterologist and Internal Medicine

    Niloufar Guiv, MD

    3.5(52 reviews)
    14.3 miWest Hills

    "T've gone to Dr. Guiv for about 15 years. She is top notch. She is caring, warm, and empathetic…read more More importantly, she knows "her stuff" and is an excellent diagnostician. She has volunteered on more than one occasion to comment on other aspects of my health, showing me that she cares about me as a whole. I had read some of these reviews before I saw her, and was prepared for a cold, rather brusque physician. That's OK with me....they're not all warm and cuddly. BUT, Dr. Guiv is lovely and has been nothing but kind, patient, and caring with me, In 15 years, I have never seen anything but kindness and compassion. My whole family goes to her, and I have recommended her to many friends. The entire staff is friendly and knowledgeable. I recommend Dr. Guiv. She's a gem.

    Wildly unprofessional to the extent that I am wondering if her negligence is due to bias, religious…read moreor otherwise. I work in health care, and do not generally experience this kind of thing. I was told to see her and schedule a medical procedure involving surgery. I was not provided other options. I scheduled to meet her. She was extremely brief and direct, but kindly. I liked her in the brief time I met her. I scheduled the procedure many months in advance and never spoke with her again. The week prior I did her prep protocol. I am aware that people can feel ill prior but I was so violently ill for 3 days with her prep care medicine that I was up all night sick and unable to function. It impacted my family as I was incredibly ill. Faint, hot/ cold, throwing up, sick in a car. The only times I have ever been that sick are when 1) I was in the ER with my appendicitis and 2) directly after a six hour surgery due to anesthesia. Also once in Paris after having shellfish but that passed in 5-6 hours, this went on for days. I let the office know multiple times and asked if she could please talk with me. I spoke with reception and an assistant, no nurse and no doctor. They reduced the medicine and I started to feel better. I spoke with a family member who is a hospitalist out of state and he was really concerned. I asked about other options and was told there are some, not as solid, but less likely to make me sick and suggested I speak with the doctor. I called the office to discuss but was shut down. Given the effect of the medication, I was also hesitant to go under without talking with her. I canceled the surgery as I really believe in patient care and that the cure should not be worse than the issue. She then sent me a letter I was fired as a patient, certified mail, due to a break down of communication. In other words, there was no communication but me, very sick, asking for a phone call. How could she take the time to arrange that but not call me back when I was incredibly ill from her prep? I believe I am fairly low risk, so having that conversation would have been much appreciated as well. Yet, impressively, she chose to fire me as a patient due to what, why, I wanted to speak with the doctor who prescribed me medication that made me sick? As if I was trying to run back to her after I canceled my surgery? All I wanted was a phone call at the beginning. I do know how busy doctors are and that trivial matters can weigh them down, but I was incredibly sick. The ability to be humble and kind is what makes this world a good place, and had she taken a moment to discuss options I probably would have just moved forward. I still do not have any questions answered. I dislike leaving bad reviews in the health care space, but there is a lot of arrogance and sometimes it is important - she found it necessary to treat me abusively and so there it is. I am not a lab rat and certainly not going to allow someone to perform surgery on me that is so callous they won't take a minute out of their day to speak with me and assuage the issue they created. Patients do need to advocate for their care, we are human and not everything is suited to everyone.

    Advanced Gastroenterology - gastroenterologist - Updated May 2026

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