Advanced GI LLC

Gastroenterology located in Chicago, IL

Welcome To Advanced G.I.

Advanced GI LLC, in the Lake View neighborhood of Chicago, Illinois, offers advanced diagnostic and treatment procedures to treat a wide range of gastroenterology issues. Fellowship-trained gastroenterologists Michael Flicker, MD, Carl Atallah, DO, Manish Dhamija, MD and Mona Lalehzari, MD take a comprehensive, holistic approach to conditions like cancer, gastroesophageal reflux disease (GERD), and inflammatory bowel diseases.

The Advanced GI LLC medical team offers various advanced diagnostic technologies on-site to give patients the answers they need without delay. They offer minimally invasive procedures in-office, including upper endoscopy, capsule endoscopy, Bravo™ pH monitoring, and endoscopic ultrasounds. These technologies provide vital information about the root cause of unexplained chest pain, abdominal pain, rectal bleeding, and constipation.

Taking an individualized approach to treating gastrointestinal conditions, Dr. Atallah and Dr. Flicker focus on relieving persistent symptoms and protecting the long-term health and function of the stomach, colon, esophagus, and other digestive organs. The gastroenterology experts specialize in advanced treatments like anorectal manometry, radiofrequency ablation for Barrett’s esophagus, hemorrhoid banding, and luminal stents.

The team also values the importance of preventive care to reduce your risk for cancer and other complicated diseases. They offer preventive, in-office colonoscopies and other screenings to identify cancer in the earliest stages when treatment is most effective.

To better provide for the community, the entire Advanced GI LLC team is fluent in both English and Spanish.

If you’re looking for a reliable, experienced gastroenterologist to diagnose unexplained symptoms or need treatment options for constipation, cancer, or other gastrointestinal condition, call Advanced GI LLC or book an appointment online today.




Advanced Procedures, Comfortable Environment


Using advanced imaging and the latest techniques, we strive to treat patients with a level of care and comfort unlike any other practice.







What Can I Expect From My Doctor?



Step 1:

Come in for an exam and our gastroenterologists will diagnose your symptoms based on your medical history and unique needs.



Step 2:

After deciding on a treatment plan, we will go over how to prepare for your visit, from diet advice to medication recommendations.



Step 3:

Our gastroenterologists at Advanced G.I. LLC will continue working with you to ensure the optimum health outcome.




Insurances Accepted

We are proud to accept a wide array of insurance companies, and we invite you to contact our office if you have any questions or do not see your insurance provider listed.

Beech Street
Blue Cross PPO
First Health
Great West
Meritain Health



Words from our patients

  • Google

    "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.
  • Healthgrades

    "Dr. Flicker is an amazing GI doctor. Was very attentive to my problem. And suggested few different approaches.."

    Julia S.
  • Vitals

    "Under Dr. Flicker's care, I have returned to a normal healthy lifestyle within three months of my initial visit."

    Self-verified patient
  • Yelp

    "I really felt cared for as a person and would recommend Dr Atallah and is staff without reservation. I would give him 10-stars if I could!"

    Pho E.
  • Google

    "They are both talented, intelligent, and deeply passionate about providing the best care for their patients."

    Fatma H.

Advanced GI LLC
3000 North Halsted Street, Suite 623
Chicago, IL 60657
Phone: 773-281-5818
Fax: 773-281-6895 
Advanced GI LLC
2845 North Sheridan Road, Suite 801
Chicago, IL 60657
Phone: 773-281-5818
Fax: 773-281-6895 

8:00 am - 5:00 pm
8:00 am - 5:00 pm
9:00 am - 5:00 pm
8:00 am - 5:00 pm
8:00 am - 12:00 pm
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