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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.

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Colonoscopy

A colonoscopy is now the gold standard used to detect or prevent individuals from getting colon cancer. Adults starting at age 45 years are strongly recommended to have a colonoscopy or some other test to screen for colon cancer.

Capsule Endoscopy

During the procedure, a patient swallows a vitamin-sized pill with a camera inside (pill camera). Transported smoothly and painlessly through the GI tract by the body’s own natural peristalsis, the video pill capsule transmits images of different parts of your intestine, such as the small intestine and the esophagus.

ERCP

An endoscopic retrograde cholangiopancreatography, more commonly known as ERCP, is an endoscopic procedure that is also combined with X-rays. ERCP is very much like a typical upper GI endoscopy; however, your gastroenterologist will inject a dye during the procedure, which highlights problems in certain digestive organs through X-ray technology.

Flexible Sigmoidoscopy

A sigmoidoscopy is an internal exam of the lower part of the large intestine (colon) using a short, thin, flexible, lighted tube with a camera at the tip. This procedure helps determine the cause of abdominal pain, rectal bleeding, changes in bowel habits, chronic diarrhea, and other intestinal problems.

Hemorrhoid Treatments

Two of the most common treatments for hemorrhoid removal are hemorrhoid banding, which cuts off blood flow to the hemorrhoid, and infrared coagulation (IRC) therapy, which uses infrared light to shrink and shrivel hemorrhoids. The treatment method depends highly upon whether the hemorrhoids are external (around the anus) or internal (in the rectum).

Upper Endoscopy

An endoscopy is a very common and safe procedure that is used to examine the esophagus, stomach, and upper part of the small intestine, known as the duodenum, to get a closer look at what may be causing symptoms.

Celiac Disease

Celiac disease is an autoimmune disease where a patient’s immune system abnormally responds to the ingestion of gluten. It is estimated that 1 in 100 people worldwide is affected by celiac disease. However, up to 2.5 million people in the United States may have celiac disease and not know it, as the symptoms range from mild to severe.

Constipation

Constipation is defined as having a bowel movement fewer than three times per week. With constipation, stools are usually hard, dry, small in size, and difficult to eliminate. Some people who are constipated find it painful to have a bowel movement and often experience straining, bloating, and the sensation of a full bowel.

GERD

Gastroesophageal reflux disease (GERD) is a more serious form of gastroesophageal reflux (GER) which is common. GER occurs when the lower esophageal sphincter (LES) opens spontaneously, for varying periods of time, or does not close properly, and stomach contents rise up into the esophagus.

Hemorrhoids

Hemorrhoids are swollen veins in the anal canal. This common problem can be painful and can be caused by too much pressure on the veins in the pelvic rectal area. Normally, tissue inside the anus fills with blood to help control bowel movements, but if you strain or sit on the toilet a long time to move stool, the increased pressure causes the veins in this tissue to swell and stretch.

Inflammatory Bowel Disease + Crohn's Disease & Ulcerative Colitis

Inflammatory bowel disease (IBD) encompasses a set of gastrointestinal diseases where parts of the digestive tract are chronically inflamed by a dysfunctional interaction immune system. Hereditary factors and an abnormal interaction between microorganisms and the immune system are felt to play a role.

Irritable Bowel Syndrome

It is estimated that 10 to 15 percent of Americans have Irritable Bowel Syndrome (IBS). IBS is a functional GI disorder that refers to a group of symptoms that affect the digestive tract, often resulting in abdominal pain, bloating, or cramping. However, some people with IBS have no symptoms at all.

What Our Patients Say About Us

Long Island Gastroenterology Specialist is an amazingly well run office. From the women who greets you at the desk, the nurse, Dr Rush, the radiologist and the other staff members everyone is very kind, professional, and put me right at ease for my procedure. Highly recommend this office!
Tricia
Tricia
Dr. Barth is a great doctor. Office runs smoothly and have never had an issue there. Been using him for more than 20 years.
Mitchell W.
Mitchell W.
Dr. Carly Barth is great. She has an awesome bedside manner. She is a kind, caring and compassionate person. Her staff is helpful and friendly. I would definitely recommend her to anyone searching for a gastroenterologist.
Ante P.
Ante P.
Dr. Marshak is terrific. Caring, professional and a great person. This practice strikes while the iron is hot, no nonsense getting treated
Steve C.
Steve C.
So far experience has been very pleasant with Dr. Razzano and his entire staff. Everyone has been extremely friendly and has explained their role in the process of getting me well. I'm still waiting on results so I'll update my review once all is completed
Line H.
Line H.
Great experience all around! Dr. Rush is thorough , compassionate, professional , and makes you feel like you are important. He answers all of your questions and you never feel rushed! Love the office . Everyone is pleasant , helpful , and knowledgeable! Hard to find these days so I am happy that I found Dr. Rush!
Wendy B.
Wendy B.
Dr Michael Barth and his staff are excellent and highly recommended. I have been going here many years and will continue to utilize their services when needed.
Anthony
Anthony
Have had two procedures done by Dr. Carly Barth. I was quite happy with her and felt very comfortable with how she took the time to explain the procedures. Very professional and caring about her patient. Office staff also very courteous. Definitely recommend their practice.
Tim B.
Tim B.
Dr. Marshak and the entire staff are wonderful! Ease of appointments, no wait time, and caring professionals. I highly recommend it!
Helen L.
Helen L.
Awesome experience! Dr. Razzano has great bedside manner. He is very thorough and takes the time to explain everything in detail. He is efficient in following up on test results and truly cares about his patients. Highly recommend!!
Deandra L.
Deandra L.

Blogs
IBS

How to Relieve IBS Pain

The abdominal pain and cramping of irritable bowel syndrome (IBS) can range from a nagging ache to a flare that stops you in your tracks. If you are searching for

Read More »
August 8, 2026
Bloating

How to Stop Bloating After Meals

That tight, swollen, uncomfortable feeling that shows up after eating is one of the most common digestive complaints, and it can turn an enjoyable meal into hours of discomfort. The

Read More »
August 1, 2026
Diet

How to Follow an Elimination Diet for IBS

For people living with irritable bowel syndrome (IBS), food can feel like a minefield, with meals sometimes triggering abdominal pain, bloating, and unpredictable bowel habits. A structured elimination diet is

Read More »
July 22, 2026

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Important Notice: Participating Carriers

We are pleased to inform you that our services are covered by a variety of participating insurance carriers. Please review the list of participating carriers to ensure your plan is included. 
 
  • 1199
  • Aetna
  • Cigna
  • Cigna Medicare Advantage
  • Emblem, GHI, HIP
  • Blue Cross Blue Shield Empire
  • NYSHIP/UHC Empire Plan
  • Humana
  • Humana Military/Tricare
  • Independent Practice Association of New York (IPA NY)​
  • Magnacare
  • Medicare New York
  • Multiplan
  • Oxford
  • United Healthcare
  • World Trade Center
If you have any questions or need assistance, don't hesitate to contact us.