Testimonials & Reviews


Advanced GI LLC

Gastroenterology located in Chicago, IL

4.92/5 Star Rating
37 total reviews

Advanced GI LLC always appreciates feedback from our valued patients. To date, we’re thrilled to have collected 37 reviews with an average rating of 4.92 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.

Margarita R.
5/5 Star Rating
Submitted 11/06/23
very good doctor
Mike F.
5/5 Star Rating
Submitted 11/05/23
Easy scheduling appointment went great
Rachel C.
5/5 Star Rating
Submitted 11/04/23
Dr Lalehzari might be the kindest, most personable doctor I’ve been to. I really appreciated the way she listened, asked clarifying questions and talked me through what tests she’s was going to run and why. I’m grateful she’s the doctor I was referred to!
David M.
5/5 Star Rating
Submitted 11/03/23
Everyone I encountered was extremely pleasant and made the visit the much nicer
Nancy S.
5/5 Star Rating
Submitted 10/30/23
Dr Atallah and Dr Rogers were both stellar. They are the ultimate professionals. The staff in the procedure room put me at ease and was comforting and kind. Checking in at 7 for my 8 am procedure was a disaster and upsetting. No one was in the fifth floor waiting room when I arrived. The door was locked tight. I went down to the lobby and the receptionist looked my name up and said I wasn’t on the schedule for that day. She told me to go to the hospital instead because “They tell patients the wrong place to go. That’s where your procedure will be.” I’m glad I stayed put and asked her to call upstairs. Someone answered and I was told to go on up. But the door was STILL locked with no one at the desk. As it turns out, the employees were all late to work. The first one in after 7 was supposed to let patients in but she was in the back, at her desk blabbing with a co-worker. It was a horrible start. These lackadaisical employees clearly don’t care about their jobs or nervous patients.
Chris L.
5/5 Star Rating
Submitted 10/30/23
Cleetus F.
5/5 Star Rating
Submitted 10/30/23
Not only is Dr Atallah kind and attentive, his entire staff always makes you feel as though you are their only patient. I wish all of my doctors were so great.
Feliks M.
5/5 Star Rating
Submitted 10/29/23
Very good service! Thank You!
Andrew Y.
5/5 Star Rating
Submitted 10/29/23
Dr. Atallah was great. Friendly, explained the process and made me feel comfortable.
Floree F.
5/5 Star Rating
Submitted 10/29/23
I always receive the most personalized, professional care from Dr. Atallah. He always taking the time for expert explanation and I cannot be more pleased!
Marie B.
5/5 Star Rating
Submitted 10/07/23
The idea of a colonoscopy does not appeal to anyone, I think. Dr. Lalehzari made me feel comfortable right away. She is personable and exudes positivity. She addressed my concerns and we created a plan I feel comfortable with.
Joanne P.
5/5 Star Rating
Submitted 10/06/23
Very professional, listened to my concerns and explained my pathology report so that I would understand.
Joy M.
5/5 Star Rating
Submitted 09/04/23
Dr. Atallah was attentive and explained things well.
Leslee N.
5/5 Star Rating
Submitted 08/31/23
Excellent service, professional and courteous. Thank you!!
Adrianne B.
5/5 Star Rating
Submitted 08/30/23
Doctor atallah is very good listener. He answered all my questions and concerns.
Inez Annie G.
5/5 Star Rating
Submitted 06/22/23
Front office ck in, very friendly.1st visit n Nurse who took my info was very thorough n friendly. Dr. Atallah was sincere in his manner to help me w my situation. Very kind. N Maria getting my appointment for my procedure was excellent n thorough on letting me know my instructions. Overall… excellent
Gerie W.
5/5 Star Rating
Submitted 05/07/23
Dr Flicker is outstanding, focused and knows what meds work. I’m had bad experiences until I found Dr Flicker. He’s restored my health. He personally calls to see how I’m doing. He treats me like family. I’m lucky to be his patient
Lisa T.
5/5 Star Rating
Submitted 04/19/23
Dr. Atallah is a great listener and extremely knowledgable. I highly recommend him.
Brittany R.
5/5 Star Rating
Submitted 04/03/23
Dr. Atallah is the best doctor I have ever seen. I’ve never had a doctor listen to me so well and hear my fears. I’m so happy he is the doctor I am seeing.
Greg K.
5/5 Star Rating
Submitted 03/29/23
Dr Atallah is very empathetic and listen to what my concerns were. He was genuine and we came up with a plan. He asked what I wanted to do after giving me options. I get like he really cared about my well being.


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.