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    David C Byrnes, MD

    3.1 (11 reviews)

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    NYU Langone Brooklyn Endoscopy & Ambulatory Surgery Center

    NYU Langone Brooklyn Endoscopy & Ambulatory Surgery Center

    4.2(10 reviews)
    6.7 kmMidwood

    Had endo apptmt for 7:15am on 2/5/24 and due to a billing error, account was showing that I needed…read moreto pay $6k co-pay for procedure. Instead of the receptionist helping sort it out...she yelled at me, "Sir! You need to decide what to do right now!" I had to tell HER to calm down and relax. Yelling at a patient! Yelling over $6k as though she is the one paying that outrageous amount. This is unprofessional. I am a patient. I can have a terminal condition and instead of some bedside manner I get barnyard animal attitude! It's customer and patient services. Have some professionalism or get a more appropriate job to the level of attitude with which you carry yourself.

    Appointment was for a routine colonoscopy and endoscopy. I saw Dr. Vozick. He was extremely…read moreknowledgeable, made sure I understood everything that was going to be done, extremely friendly and empathetic, kind, and thorough. He is, quite literally, everything you want your doctor to be. Let's face it. The procedure is a little bit like going to the dentist. Nobody wants to go, but it's quite necessary. We're all scared, ummm.... sh*tless by teh procedure, but Dr. Vozick was calming and reassuring. Made sure I understood every step of the procedure. The preparation was still... ummm.. bad. But after the prep, Dr. Vozick made the whole thing easy peasey. I am *so* glad I went to him. I know it's weird to hear someone gush about a proctologist, but... he's the best!

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    NYU Langone Brooklyn Endoscopy & Ambulatory Surgery Center
    NYU Langone Brooklyn Endoscopy & Ambulatory Surgery Center
    NYU Langone Brooklyn Endoscopy & Ambulatory Surgery Center

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    Oleg Katcher, MD

    Oleg Katcher, MD

    4.0(4 reviews)
    7.1 kmMidwood

    Horrible staff, treats you as second class citizens always telling you what to do. I only see such…read morerudeness in Russian owned businesses. Perhaps changing reception would help. I also didn't like unnecessary tests to bill my insurance for. All of theses tests take my time and not addressing my main issue. They choose labs for testing that likely pay them back because they send me to do them somewhere in Bay Ridge where in the Lab that can do the same tests just few blocks away and can send results back to any doctor. When I have pointed out to them, they told me in their typical rude manner that in the Lab they send to Doctor is doing the tests, wth??? It should be technician, and when I told them I'm going to Lab few blocks away - I was told they're not going to do another pre-approval.

    I visited the 5091 Amboy Road location. Dr. Oleg Katcher and his entire staff are absolutely first…read morerate. Dr. Katcher made the entire colonoscopy process so e.a.s.y. so much so, that I am singing his praises to my family and friends that they really have no excuse. I am b.u.s.y. and cannot slowdown too much for this bowel preparation along with 3 visit ordeal (1. Consult 2. Procedure 3. Followup). So I was extremely grateful for the office to allow me to preschedule in advance (YES!) my target specific time/dates from the getgo. Who does that nowadays?! The staff was patient in answering all my m.a.n.y. questions. Anesthesiologist Dr. Bibawy listened to my past history of negative reaction to certain meds. Anesthesia adjustment was stellar (I quickly dreamt well. Upon wakeup, the lovely meds made me totally forget--a brief scan around the room had to remind me that I was here for a procedure. I was so well rested no nausea, vomiting. The dose was right on because there no lingering drowsiness. I was alert enough to do my laptop work immediately afterwards. FANTASTIC anesthesiologist! To be ultrasafe, given the ever increasing litigious landscape, no worries-I still had a family member drive me home to be ultrasafe though. Back to wonderful Dr. Katcher: My tuckus had absolutely no pain---even afterwards no side effects. All this and reputable Cornell, Mt. Sinai, Memorial Sloan Kettering trained to boot! I'm grateful I don't have to travel into the city to get Manhattan level care here in Staten Island. Dr. Katcher's bowel prep protocol even allowed me to eat something 1 day prior (egg for breakfast, chicken piece for lunch) so I wasn't really hungry. I absolutely was skittish to do this, much less do it again years later. Now I'm alllllllll in. It really can't get better than this. Do it!

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    Oleg Katcher, MD
    Oleg Katcher, MD
    Oleg Katcher, MD

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    Jonathan Warman, MD

    Jonathan Warman, MD

    4.1(9 reviews)
    11.8 kmUpper East Side

    I've been a patient of Dr. Warman's for 15 years now. Claudia McGeary, formerly right-hand…read moreassistant to John Squire and, later, me, referred me to him. She's old school and meeting her standards ain't easy. Dr. Warman is the best internist on the Eastern seaboard. His front office staff does a great job managing the patient load. The result: almost no waiting time (15 minutes MAXIMUM) at his office. He has a great referral network. Oh yeah, and he's Steve Guttenberg. He's affable yet efficient, good- humored, and he takes your health and privacy seriously. When he has test results for you, including and especially STD/STI/venereal disease tests, he himself calls you. If you don't pick up, then he leaves you a message telling you to call him back, but doesn't leave the results of the tests themselves in the message. Those he ALWAYS gives you over the phone or in person. He delivers the good news briskly, and you feel he is as happy and relieved as you were. I've also seen him deliver the uncertain or bad news with kindness and understanding, spending hours with her and her family, discussing which option would be the better one. It was a contentious proceeding, but he handled it with diplomacy. professionalism and patience. The process lasted for several hours, concluding in a major decision that prolonged the patient's life. He has embraced the latest technology and pioneered an easy check-in process that streamlines the provision of patient information including insurance.

    Nice, pleasant and thorough the colonoscopy was quick well done. Doctor is congenial informative.read more

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    Jonathan Warman, MD
    Jonathan Warman, MD

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    Gotham Gastroenterology

    Gotham Gastroenterology

    5.0(1 review)
    2.9 kmBrooklyn Heights

    Great office Dr Leslie Park carefully and professional resolved my medical problems. Good…read morelistener and really care about patients I don't have pain right and so happy I am back to normal I really recommend this doctor especially if something new symptoms of you stomach or intestine coming up . Thanks for your help New patient SVETLANA

    From the owner: The experienced board-certified physicians at Gotham Gastroenterology offer comprehensive and…read morehighly specialized care in gastroenterology, hepatology, women's gastrointestinal health, and nutritional services.  With locations throughout New York City in the Midtown East and Financial District neighborhoods of Manhattan, New York, and Brooklyn Heights, Brooklyn, Gotham Gastroenterology provides the highest quality medical care and services in a compassionate, professional, and personalized environment. Gotham Gastroenterology's physicians have expert skills in performing endoscopic procedures, which allow them to see the intestinal tract in great detail. This ensures optimal diagnosis, treatment, and prevention of digestive system diseases.  Patients come to the practice with a variety of symptoms, such as bloating and gas, abdominal pain, diarrhea, constipation, bloody stools, and nausea and vomiting. Some of the conditions these exceptional gastroenterologists treat include gastritis, H. pylori infections, peptic ulcer disease, irritable bowel syndrome (IBS), swallowing disorders, liver disease, pancreas and gallbladder disease, hemochromatosis, celiac disease, diverticulitis, and Barrett's esophagus, as well as acid reflux and gastroesophageal reflux disease (GERD). They also treat inflammatory bowel disease, which includes ulcerative colitis and Crohn's disease...

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    David C Byrnes, MD - gastroenterologist - Updated June 2026

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