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About Gastrointestinal Associates of Rockland

Gastrointestinal Associates of Rockland PC is one of the largest and most accomplished gastroenterologist practices in the county. From their offices in New City, New York, the exceptional physicians have been providing high-quality medical care in a safe, professional, and comfortable environment since 1985.

We combine state-of-the-art medicine with cutting-edge technology (typically seen at elite hospitals). We provide some of the highest-level care for gastrointestinal, liver disease and colorectal cancer prevention, detection and screening in the Rockland area. At the same time, we stay committed to providing professional, personal and compassionate care while obtaining complete patient satisfaction and comfort during the patient’s visit.



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Enhancing Patient Care

Gastrointestinal Associates of Rockland focus on delivering patient-centered care is carried out through the generation of positive outcomes in all aspects of healthcare delivery.

In every step of the patient journey, we have reimagined healthcare to create seamless coordination across all areas. Our providers empower our patients to take an active role in their healthcare through on-time preventative screening and gastrointestinal care to achieve consistent and personalized care.

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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.

Endoscopic Ultrasound

A procedure that allows a physician to examine the linings and walls of the esophagus, stomach, duodenum (first part of small intestine), rectum and lung. It also can examine organs near the gastrointestinal tracts, such as the lung, liver, gallbladder and pancreas.

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

Dr Banner is excellent; he’s professional and concerned for my comfort and ease. I would highly recommend him to everyone
Lawrence
Lawrence
Dr. Goodman and staff made my experience comforting. They are organized, timely and thoughtful. I highly recommend these professionals.
Robert
Robert
Dr. Lo is kind, super-smart and very caring. His team welcomes you and communicates really well. From beginning to end you can be sure that you will be taken care of professionally. If you have a GI issue or just need routine care, you can be sure you are in good hands here.
Barry
Barry
Dr. May is amazing. Amazing bedside manner. Takes time with you and answers all your questions and I ask a lot of questions lol. If anything seems wrong he is very thorough. I have been going to him for over 10 years. He is the best!!!
Lori
Lori
Dr. Molinas was very thorough and professional. She gave me suggestions on eating, and how to maximize the medication that she prescribed for me. I would recommend her to friends & family.
Michele
Michele
Dr. Olstein was very kind and considerate. He listened attentively to all my concerns and answered all my questions. He took his time and showed me to the scheduler to pick a date and time for my procedure. The entire staff was pleasant.
Barbara
Barbara
Dr. Banner is always great with me. I recommend him to anyone looking for a G.I. Doctor in the area. The nurse Elieen was so nice and made sure I was very comfortable. Overall the whole office is amazing!
Cealla
Patient Testimonials
Dr Goodman and his staff did a wonderful job of explaining and preparing for my procedure, from the front desk to the medical assistants it was a flawless experience. I highly recommend this Gastroenterology group.
Steve
Patient Testimonials
The Dr. had a great bedside manner. He and the staff were very helpful! Dr. Lo was very thorough and covered everything that I was concerned about. I recommend him and his staff to anyone looking for a great physician
Gloria
Patient Testimonials
Dr. May is not only a very knowledgeable doctor, he's also a very nice person who makes his patients feel very comfortable and secure! I highly recommend him.
David
Patient Testimonials
Dr. Molinas was very informative of the procedure and was extremely thorough checking my past medical history. I feel very confident using her.
Laurie
Patient Testimonials
Dr. Olstein is very personable and explains procedures thoroughly and then asks if further clarification is needed or any questions. I felt very comfortable with my medical consultation and future procedure based on my meeting of Dr. Olstein.
Marika
Patient Testimonials

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

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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

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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

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July 22, 2026

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