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Gastroenterology Care
With Offices in Manhattan

Welcome to Vanguard Gastroenterology Clinic Located in New York, NY

Vanguard Gastroenterology offer services that includes gastro consultations, clinical trials, colonoscopy procedure, upper endoscopy, screening colonoscopy, sigmoidoscopy exam, capsule endoscopy, ERCP, endoscopic ultrasound, integrative weight management, fecal microbiota transplantation and much more! Visit us at a location near you. For more information, please call us or book an appointment online. We serve patients from New York NY, Queens NY, Brooklyn NY, The Bronx NY, East Elmhurst NY, Ridgewood NY, Valley Stream NY, and Staten Island NY.

Our Physicians

Our doctors and staff are devoted to our patients and to the commitment of providing quality patient care on all levels

Vanguard GI: Recognizing Excellence

New York Times Super Doctors 2020

Edward Brettholz MD (“Hall of Fame” – 10 consecutive years)
Jonathan Cohen MD
Caterina Oneto MD
Scott Weber MD

New York Magazine Best Doctors 2020

Inessa Khaykis MD
James Salik MD
Alex Sherman MD

NYU Grossman School of Medicine – Promotion to Clinical Professor of Medicine

Alex Sherman MD

“Vanguard to Your Door” – Complimentary Covid 19 testing of NYC Firefighters

Jonathan Cohen MD
Inessa Khaykis MD

Patient Reviews & Feedback

Dr Cohen has been my GI dr for some years now. He is an excellent clinician, knowledgeable, timely, thorough and concerned. I highly recommend him to anyone with GI issues.

Vanguard Gastroenterology New York City, NY

Deborah W

My wife and I had colonoscopy screenings with Dr. Friedlander. He is a warm human being and excellent physician. He and his staff made the experience very comfortable. Many thanks!

Vanguard Gastroenterology New York City, NY

Dino D.

Dr Brettholz is a Great doctor. He definitely knows what he’s talking about. Very experienced and makes you feel very comfortable. Highly recommended!

Vanguard Gastroenterology New York City, NY

Ioannis S.