Testimonials & Reviews


Advanced GI LLC

Gastroenterology located in Chicago, IL

4.81/5 Star Rating
16 total reviews

Advanced GI LLC always appreciates feedback from our valued patients. To date, we’re thrilled to have collected 16 reviews with an average rating of 4.81 out of 5 stars. Please read what others are saying about Advanced GI LLC below, and as always, we would love to collect your feedback.

Geraldine W.
5/5 Star Rating
Submitted 03/14/23
Fabulous,Dr Flicker treats us like family. He focuses on my symptoms, ordering tests and meds when needed. He calls us at home with results.He is very thorough in discussing options. I trust him 100%. I’m fortunate to have him as my Doctor, blessing.
Kyle A.
5/5 Star Rating
Submitted 01/18/23
Dr Atallah is truly one of the best. From the first day I walked in barely able to stand due to complications with my U.C. and he was able to quickly get me on a medication that has been a life saver. To the phone call from his car in the rain that he made to me in 2020 when I was concerned about being immunocompromised to my last virtual checkup after moving away from Chicago he has always, without fail, provided the same high level of care, knowledge, empathy and attention. I could not recommend him more. He is one of the good ones.
Farida H.
3/5 Star Rating
Submitted 12/13/22
My husband has seen Dr Atallah here. He is wonderful, he listens, cares and takes the time to talk to you and answer questions. He’s very personable. After the procedure he came to recovery to discuss the results. I would highly recommend him and five his 5 stars. I took away two stars for two reasons. 1.The practice. Wait times to see a doctor here can be several months. When you are in pain, suffering and need help, it is daunting. I get that they are trying to see as much people as possible, but these wait times will only get longer. Im sure they enjoy having a full calendar months in advance but as much as we would like to schedule another visit, waiting months for an appt is not in our best interest. 2. Being able to actually reach your doctor here can be like pulling teeth. You must endure the automated system and leave a message. The staff most often do not return calls or answer the ph. On occasion you night get lucky and they will pick up. They are not the most personable here either.
5/5 Star Rating
Submitted 09/04/22
Pat O.
5/5 Star Rating
Submitted 07/01/22
Everything went well, happy with the results also. *****
Roland H.
4/5 Star Rating
Submitted 05/31/22
Regular colonoscopy. Overall good experience, very good staff and facility.
Jeanne P.
5/5 Star Rating
Submitted 12/20/21
Dr. Flicker and his staff are very kind and understanding ❤!!! Dr. Flicker explains things so you know exactly what he is talking about. I will definitely recommend him to anyone that needs medical attention for their health issues!!! He is a good Doctor
Vivian T.
5/5 Star Rating
Submitted 08/13/21
Best GI ever
Corina R.
5/5 Star Rating
Submitted 01/06/21
Doctor very professional and friendly. Explained everything.
Ronald V.
5/5 Star Rating
Submitted 12/30/20
he was very informative and answered my many questions which is important to me feel confident
Tania S.
5/5 Star Rating
Submitted 12/30/20
Dr. Atallah is an example of what a doctor should be: Attentive, Trustworthy and Empathetic. If it were possible, I would give him 7 stars!
Mynor O.
5/5 Star Rating
Submitted 12/19/20
i want to thank you Dr. Flicker and stuff for their great support, may God bless you all!
5/5 Star Rating
Submitted 12/18/20
He explains in detail what my husband need to do in order for his on going stomach issues to get better. He shows that he really care about his patient.
Tori C.
5/5 Star Rating
Submitted 12/17/20
I came in ready to have to fight for myself and advocate on my own behalf. I was really ready for an argument, because I’ve been blown off by doctors in the past. Dr. Atallah blew me away. He listened to everything I had to say, asked me what I felt was going on, and came up with a better plan to help me some answers than I had come up with on my own. I was impressed with his explanations, he didn’t talk down to me and explained everything at a level that I understood, and made sure I was comfortable with all of it.
Heather G.
5/5 Star Rating
Submitted 12/17/20
I always have a great visit. Very personable and attentive.
Gary S.
5/5 Star Rating
Submitted 12/17/20
Staff was friendly


Hands down the best GI I've been to in all my years. Cannot recommend more. Very informative and takes the time to listen and obviously actually cares.

- Patrick D



I give this doctor 5 stars. When searching for a doctor you want a man with stellar credentials. Top schools, residencies and fellowships. You don’t want a guy who finished in the bottom half of his class and is in it for the money. Two, you want a professional who has a relationship with a top tier hospital – not one rated at the bottom, with no top quality programs and services, and three, you want a doctor who shows you respect, explains things, listens to your concerns and understands showing up is scary enough. Doctor Flicker has all the qualities you want in a gastroenterologist. I work as a consultant within the legal arena of medical malpractice and so I was very careful about picking someone when needing a colonoscopy and endoscopy. I would highly recommend this Doctor for your specialized care or a second opinion.

- Margaret P



Dr. Flicker renewed my faith in the healthcare system and provided the best care I've encountered yet in my journey towards a GI diagnosis. His staff is great and easy to work with (awesome front desk and PA). Dr. Flicker is thorough, communicative and very knowledgable about complex GI conditions.

- Jamil M



I am a nurse anesthesiologist (CRNA) and have had the privilege of collaborating with Dr. Flicker and Dr. Atallah for several years. They are both talented, intelligent, and deeply passionate about providing the best care for their patients. I am inspired by their grace, humility, and professionalism every single day. They are dedicated to the work they do and I trust them implicitly. As a fellow healthcare provider, I recognize quality clinicians and they are nothing short of exceptional. This is the reason I choose them as my own personal physicians and refer my close friends to them as well. Thank you, gentlemen for all that you do.

- Fatma H



Dr. Flicker and his staff are the best. They are always warm and gentle with you . Dr. Flicker is kind, gentle, soft, and tender with you. He makes me feel welcome and not afraid. I would recommend him to all my friends and family.

- Loretta D.



Excellent Service. Best GI care I've ever had. Thank you.

- JC



Staff was wonderful and responsive. Excellent experience.

- JaPeterson



I have nothing but great things to say about these doctors & all of their staff! Everyone is so nice!

- Dawn W.