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516-785-6800
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Fax: 516-785-2121
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About Long Island Gastroenterology Specialists


Long Island Gastroenterology Specialists offers exceptional care from board-certified and fellowship-trained gastroenterologists at its offices in North Wantagh, and South Wantagh, New York. 

They use their years of experience and advanced diagnostic techniques to diagnose and treat digestive system disorders. Every doctor also has an unmatched bedside manner that ensures patients feel welcome and heard.

Long Island Gastroenterology Specialists aims to be the area’s leading provider of services for digestive disorders. The highly skilled clinicians deliver superior quality care that improves the health and well-being of adult patients of all ages. 

Conditions they treat include peptic ulcers, gastroesophageal reflux disease (GERD), Barrett’s esophagus, diverticulitis, hemorrhoids, irritable bowel syndrome (IBS), and the autoimmune disorders ulcerative colitis, celiac disease, and Crohn’s disease.

The whole team wants to make the experience as straightforward as possible at any of the Long Island Gastroenterology Specialists locations, where patients can count on a warm welcome in a comfortable, compassionate setting. 

The providers work as a team to offer the best outcomes, so patients can see another physician if theirs is unavailable. Long Island Gastroenterology Specialists uses state-of-the-art diagnostic technology, including Medtronic’s PillCam™ capsule endoscopy and endoscopes and colonoscopes from Olympus.

People often ignore symptoms like heartburn and stomachaches because they seem harmless, but it’s vital to find out what’s causing them. Long Island Gastroenterology Specialists can do this and follow up with cutting-edge treatment options. 

Their capable staff strives to meet every patient’s medical needs successfully and includes a female gastroenterologist so patients can choose a provider who makes them feel comfortable.

To find out more about Long Island Gastroenterology Specialists and how they can help you, call the nearest office or book an appointment online today.

We Treat


Patients' Reviews


“Dr. Marshak was amazing!! Already recommended to my family members on Long Island.”
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Self-verified patient
"I recently saw Dr. Rush for intestinal issues. He was exceptionally courteous and very attentive in addressing the issue I was having."
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Susan O.
“Dr. Carly Barth is so very patient and personable. She makes me feel completely comfortable talking about uncomfortable topics. She’s always willing to explain things even more than once if necessary. I leave feeling like she truly cares about my overall well-being.”
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Self-verified patient
“I already recommended Dr. Barth to other people because I was so impressed with his office and staff!”
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Self-verified patient

Accepted Insurances


If you do not see your insurance provider, please call our office for additional information. 
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