As a first time patient, I had a great experience with Dr. Daneshgar and his team. I barely waited…read moreto be helped when I checked in. The staff and Dr. Daneshgar were all very friendly and helpful. I especially loved how Dr. Daneshgar really took his time to explain my conditions with me as well as my treatment options. I had a great visit and the doctor's demeanor has really put me at ease so I highly recommend his practice.

Dr. Daneshgar and the entire staff at Oak Tree Surgical Center are beyond amazing. They do…read moreanything and everything to help you and get you the best care. Highly recommended!

Very knowledgeable and caring doctor. He is an expert in his field. Highly recommended.read more

Best there is in hs field in my opinion and best bedside manner!…read moreDr Desai has been my gastro enterologist for several years. He handled various digestive issues as well as preventative care such as endoscopies and colonoscopy. He does a lot of cancer work also - including liver cancer surgeries. As long as he is available, I would chose no other specialist in this field.

What an amazing awesome GI Specialist! Dr Simoni is not only a professional, skilled, experienced…read morespecialist, he's also a very caring and kind-hearted human being! The staff are professional and efficient and caring! I give Dr Simoni my highest recommendation! He is a knowledgeable and marvelous physician! J. Dender, MD Encino

RIPOFF! Do Not trust this Doctor. I do not owe the Advanced Digestive Center of Southern…read moreCalifornia any money, yet they have sent a collections agency demanding I give them money! When I left their office many years ago, my balance was zero. Me and my Insurance Company have paid all there is to pay to the Advanced Digestive Center of Southern California. We have paid every bill and co-pay on time and in full. I have called their billing department to clear things up but the billing representative gave me incorrect information and started listing days, times and procedures that I had never been a part of. I told her she was terribly mistaken that her information was incorrect. I also told her my balance was Zero. She said ok, someone would call me back, but they never did. After reading their YELP reviews, I noticed their billing department has great difficulty with billing their clients correctly. I can see from their Yelp reviews that many, many people have the exact same complaint that I do: billing for no reason, billing incorrectly, etc. Also their employees are terribly rude to customers and could care less about everything, especially YOU. I think it is terrible this company does this same thing to other folks. Like I said, I do not owe this company any money.

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.

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.

Walking here, it is a nice facility. I heard that since writing the review, the office has moved…read more I wished the receptionists here were more friendly. They looked as if they can be bothered. Additionally, they contradict themselves when you ask them a question and two of them answer, sitting next to each other. They give opposite answers. However, Dr. Jay Guan is 5/5. He's a young, intelligent doctor that has good bedside manners and talks to you in a non-condescending way. He's very good at explaining things and working with you to understand your ailment. Overall, I would go here but the receptionists make it difficult for me to give a 5/5.

I looked around a lot before I found Dr. Guan. I had a bad experience with my previous…read moregastroenterologist. Dr.Guan is excellent and extremely knowledgeable about all aspects of his profession. He treats me and now also my wife with kindness and respect. His office is beautiful and his staff is great. We are patients for life. Thank you Dr.Guan for taking such great care of us!

I went to Dr Shamsi one year ago and he told me I have gastroparesis. The test never confirmed that…read moreit was what I had. Regardless, he still told me to take some medication for it. I decided to do other tests and was in pain for another year and a half trying everything under the sun. But nothing worked. Finally I followed his original instructions, and I was out of pain. This doctor knows what he's talking about but highly recommend

I went in to see him for some hemroids . He was able to band all 4 and I have feel 90% better. He…read morewas very laid back and made me feel at ease. The office environment is mellow. CC is kind and knowledgeable. So if you get nervous of the white coat and the serious Dr vibe this is the place you.

I called Dr. Kaushal after reading his reviews here on Yelp. I booked my first appointment and…read moreafter meeting him in person, I am happy to report that all of the rave reviews are TRUE! He is truly a very caring doctor, a terrific listener and answered all of my questions. I only ask that he PLEASE update the address on this page, as he is no longer on Lyons Blvd, he has moved to 24775 McBean Pkwy, #214 (near Henry Mayo Hospital).

I have been seeing Dr. Kaushal for about ten years. I have never had a bad experience with him or…read morehis staff. He is very attentive and straight forward. I simply can't thank him enough for taking care of me all these years.

"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.

_ Ventura County Health agent __ Dana Howard, MD Internal Medicine gives top-notch care. She…read morehas been rated one of the top doctors in Los Angeles for her very fine concierge-quality attention to her patients. She is especially skilled with the elderly patients. Thank you

Visited Dr. here and had a very disappointing experience. She was rude, unprofessional, and seemed…read moreto lack any medical knowledge. No wonder! I got quick appointment with this useless dr. Lol I scheduled an appointment for a physical, but she attempted to bill it as an 'office visit for well establishment' and then add another charge for the actual 'physical visit.' Fortunately, I left before proceeding. Later, I read a review on yelp from another patient who was charged $1,000 for this same tactic. Would not recommend this facility!