Very good gastroenterologist. Good listener. Thorough responses to my questions. No rushing through the appointment. I was very pleased to be referred to this doctor. read more

Very poor communication When you have to copy and resend a message 4 times, it is a sign to find another physician Even then a phone call was needed and they say they don't discuss test results read more

Dr. Kogan performed procedures on me, but when I attempted to schedule follow up appointments for the results with concerns, his administrative staff never answer calls, nor returning phone/email messages. I finally gave up after almost 20 times of reaching out calls & emails and switched to another doctors. read more

I had the hardest time getting a personal reference for a colonoscopy, so as a last ditch attempt, I tried Yelp. I'm so glad I did, since I found Dr. Kogan. There was an initial visit to talk through the procedure, go through any questions I had. Worth noting, Dr. Kogan was booked out for several months. After the office visit, I went to get the laxative prep. It's now in pill form which I have heard is much better than the liquid form. Prep involved not eating certain foods 4 days in advance. 6 PM the night before the procedure is when laxatives and water is consumed. This is repeated 5 hours before the procedure. Day of procedure, went in at 8:30 and was out by 11:00. The procedure itself took less than 15 minutes. All in all, I had a little anxiety going in, but Dr. Kogan and staff comforted me with their professionalism and empathy throughout the process. read more

Dr. Kogan was fine for the exam. His staff messed up scheduling a procedure TWO separate times. They miscommunicate, leave vague messages, and their record keeping system doesn't reflect reality. The first staff to answer their line says something different than staff that supposedly makes appointments. I'm done. read more

Was referred to this office by my doctor and they asked if I seen another GI before they denied me service because they claim they don't see patients for 2nd opinions. They made that determination without asking me what I wanted to be seen for. Incredible. What a joke. read more

Mark Kogan is an expert in his field, I had a previous doctor tell me some news that actually was incorrect however Mark was able to investigate and give me the information I have been searching for two years, if you need a doctor who knows his stuff Dr Kogan is your doctor! read more

I was hoping to write a very nice review, but it took them a month to schedule an appointment to get me in to see the doctor. I was supposed to go in this week Jan 31st and was just informed that the doctor would not be able to see me (late airline issue) and therefore they would need to reschedule me in April.....Seriously, April? So you could not make an exception and get me in sooner?........Nahhhh I'm good. read more

Dr. Kogan is an excellent gastroenterologist. He was nice and reassuring while at the same time providing me with all of the information that I needed. He asked if I had any questions and answered them expertly. I am very careful in who I choose to provide me healthcare, and I don't hesitate to recommend Dr. Mark Kogan. read more

Had my second colonoscopy with Dr. Kogan at East Bay Endoscopy. Everything went smoothly. The colonoscopy experience isn't supposed to be this good. Highly recommend Dr. Kogan! read more

Dr. Kogan has been my GE specialist for many years. He listens to his patients, not his assumptions. If symptoms are unclear, that's why there are medical tests. He's a doctor whose eyes are on results, not on the "bottom line", and not all physicians are like that, these days. Yes, I have a lot of respect for him. read more

Dr Kogan's ability to both question carefully and listen carefully have been of great help to me. My digestive was system was in revolt, rejecting foods I could always consume. I was steadily losing weight. Taking my concerns as seriously as I did, he ordered lab test to rule out potential causes and started me on one medication which would address the reactions I was describing while a diagnosis was sought. My digestive system quickly responded to the medication. I began to enjoy meals again and gain back the weight I had lost. I am truly grateful for the excellent care I have received from him! read more

Dr. Kogan is great. He listens well and informs very well of his diagnosis. He is sincere and gives his full attention. Everyone I have referred to Dr. Kogan has also raved about his care read more

Best Doctor, best staff, best facilities. Going through an awkward health situation was made to be a calm, cool and collect experience. Thank you to the Center for Digestive Disorder and Endoscopy Center! read more

Your review CH a minute ago I have struggled with serious and complicated chronic health problems for decades. It's always difficult to relocate and have to search for a new physician. As a former health care worker, I know that there is always a learning curve for physician, patient and office staff, especially if the patient gets sicker, as I did. I am so fortunate to have chosen Mark Kogan, MD as my physician. He is compassionate, kind and very knowledgeable. He is patient, respectful and willing to really listen to his patients. He goes out of his way to make sure his patients are taken care of. I have always felt that we are working together as a team and I have actually never experienced the level of care I have received here at any other physician's office. I am old so that's quite a few offices and physicians. I realize there have been issues with the office and calls etc. I believe during COVID these may have been somewhat more apparent and I believe that the physicians and office staff have been really trying very hard to address these issues. So I won't deduct any stars for that. I am so very grateful to have a physician like Dr. Kogan caring for me and wish all patients could have this experience with their provider. read more

I saw a lot doctors, but it's my first review ever. I must have to see a doctor a week ago, I was looking forward to do it. A short time before the visit, they called me and said that they had to reschedule my appoimant, so ok! So today I have this reschedule appoimant. I'm living about 40-50 min away without traffic, and on my way there was surprising big traffic today I realized that I will be late, I tried to call, but there was an automatic message, I decided to get there and was 10 minutes late. The mail they they send says suite 201, I have claustrophobia so I don't use the elevators, I run up on stairs to 201, It wasn't right suite, there people told me to go up to 601, I climbed the stairs to 601, this is not right, I had to go down to the first floor to check were is the doctor and it was 701. I spent another 13 minutes on this. As a result, I came and was late for 23 min, yes I'm late and it's my fault ... the receptionist began to say that doctor could not accept me because I was late, I said this is not a problem, but the receptionist began to ask me why I came to the doctor, what problems I have? I was uncomfortable to answer such questions. I just said that I have a lot of issues and I have seen many doctors in the past, but I am looking for someone I can trust and would like to get a second opinion, to which she told me: "if you have already seen another gastroenterologist, then the doctor does not accept patients for a second opinion". what nonsense!! First, I am also the same person as a doctor, who has circumstances in life that forceto be late or reschedule plans. So my first visit was canceled because the doctor changed his plans - this is normal, but if I am late - this is not normal, I saw reviews on their website as a person waited 40 minutes for his visit , And this is considered normal. Second, I do not have the right to a second, or even tenth opinion of a doctor? what kind of discrimination. read more

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I find Dr. Kogan and his staff very friendly and highly professional. Dr. Kogan addresses my questions and concerns with great attention. I appreciate his patience and expertise. read more

Dr. Kogan is very responsive to patient questions and explains his diagnosis very thoroughly and in laymen's terms. I appreciated he did not rush the consultation and has a great manner with his patients. read more

Been a patient of Dr. Mark Kogan for over 10 years. He is extremely knowledgeable, professional, and compassionate. He is a doctor that actually takes the time to listen to your physical issues. Would definitely recommend him if you need a gastroenterologist. Also, his office staff is always very polite, friendly, and professional also. read more

Very pleased! Dr. Kogan was very informative, understanding and gave great recommendations for improving my Gastro-health. He also spent as much time as necessary and was not rushed. His staff was equally courteous and understanding. read more

I've had multiple interactions with this doctor and his office. They rescheduled multiple times, saying the doctor was changing the days he worked. I might be able to understand once, but several times, every time we had an appointment, made it sound like the doctor had other issues. I did get an initial sit down with the doctor, which is required before a procedure. After all the paperwork, co-pay, authorizations were all done, the doctor's office called shortly before the procedure and abruptly cancelled it without explanation. I highly encourage people who need this type of work done to look elsewhere. read more

Doctor here is no good at his job and front desk are unprofessional. Very dissapointed with this place. Expected better. If you wish to stay ill come here. He will not care for you and you will not get better read more

Dr Kogan and his staff are wonderful, very friendly and informative. Dr Kogan thoroughly explains about the procedure and gives you options of where to schedule your appointment. read more

I never want Dr. Kogan to retire! He is one of these doctors that are on extinction... Dr. Kogan spends time with the patient asking questions, listening to the patient and educating the patient about their condition. He considers all the different options and works with the patient finding the correct approach for that patient's treatment. I went to a well known GI doctor before Dr. Kogan. I did not appreciated how rush that doctor was and he did not listen to my concerns. When I found doctor Kogan, I signed up for life to be his patient... So he can never retire!!!! read more

Dr, Kogan and his staff were prompt, informative, friendly and in general my experience couldn't have been any better!

I just had a very successful colonoscopy at the capable hands of Dr Mark Kogan. He was very courteous, highly informative, patient with all my questions and thoroughly professional. Colonoscopies are not fun, but this one, which was my second, went very well, aside of the purging. I had no complications and feel 100% better knowing I am healthy and how to stay that way as Dr Kogan was very helpful with my dietary inquiries. I recommend him most highly. I also was very pleased with the East Bay Endoscopy Clinic which was equally professional, very attentive and pleasingly thorough. The staff is very personable and the clinic is very clean and technologically up-to-date. I was even provided with pictures of what the doctor saw which was quite fascinating, if just a little bizarre. As such, colonoscopies do not need to be pure hell. They can turn out quite well. Do not put off this important right of passage! read more

Dr. Kogan is a very warm and trustworthy doctor. His staff is also very friendly and helpful. I wish he was a G.P. so I could see him for all my medical needs. Highly recommend. read more