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Clinic Type

Gastroenterology (multi-location group)

Address

3000 North Halsted Street, Suite 623, Chicago, IL 60657; 2845 North Sheridan Road, Suite 801, Chicago, IL 60657

Phone

847-491-0182

Email

Opening Hours

Not published — contact the clinic to confirm hours.

Services Offered

  • Gastroenterology
  • diagnostic and treatment procedures
  • upper endoscopy
  • capsule endoscopy
  • Bravo pH monitoring
  • endoscopic ultrasounds
  • anorectal manometry
  • radiofrequency ablation for Barrett’s esophagus
  • hemorrhoid banding
  • luminal stents
  • colonoscopy
  • in-office preventive colonoscopies and screenings

Technology & Equipment

  • advanced diagnostic technologies
  • in-office minimally invasive procedures
  • endoscopic ultrasound
  • capsule endoscopy
  • anorectal manometry
  • Bravo pH monitoring
  • radiofrequency ablation
  • hemorrhoid banding
  • colonoscopy

Team

  • Michael Flicker, Fellowship-trained gastroenterologist — MD
  • Carl Atallah, Fellowship-trained gastroenterologist — DO
  • Manish Dhamija, Fellowship-trained gastroenterologist — MD
  • Mona Lalehzari, Fellowship-trained gastroenterologist — MD

Insurance & Payment

We are proud to accept a wide array of insurance companies; please contact the office if your provider is not listed.

Languages Spoken

  • English
  • Spanish

FAQs

What services does Advanced GI LLC provide?

Advanced diagnostic and treatment procedures for gastroenterology issues, including minimally invasive procedures in-office (upper endoscopy, capsule endoscopy, Bravo pH monitoring, endoscopic ultrasounds).

Which conditions do you treat?

Conditions like cancer, gastroesophageal reflux disease (GERD), and inflammatory bowel diseases.

What technologies are used on-site?

Upper endoscopy, capsule endoscopy, Bravo pH monitoring, and endoscopic ultrasounds.

What languages are available for patient communication?

English and Spanish.

How can I book an appointment?

Call Advanced GI LLC or book an appointment online.

Photos

What Patients Say

Overall sentiment across review platforms: positive

  • Tebra: 5.0/5.0 (6 reviews listed on Tebra)
  • Practice website: 4.84/5.0
  • Yelp: Not specified

Patients praise

  • Professional and friendly staff and doctors
  • Doctors who are attentive, informative, and take time to listen
  • High patient satisfaction and recommendation rates
  • Comprehensive and holistic approach to treatment

Common complaints

  • Some patients have reported negative experiences regarding patient care

"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."

Practice website testimonials

"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..."

Tebra patient review

"This was one of the worst experiences I have had in doctor- patient care."

Yelp review

Synthesized from public review platforms as of Jul 11, 2026 — sources: [1][2][3][4].

Information sourced from the clinic's website as of July 11, 2026.

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