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About Digestive Healthcare Associates

We are a five-physician practice of gastroenterologists serving the Long Island area for 30 years. Digestive Healthcare Associates offers a full array of gastroenterology services such as Hemorrhoids, Colonoscopy, Endoscopy, Hepatitis, Colitis, Crohn’s Disease and many more!

We combine state-of-the-art medicine with cutting-edge technology (typically seen at elite hospitals). We provide the highest-level of care for all gastrointestinal disease, liver disease and colorectal cancer prevention, detection and screening in the Long Island 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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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.

Bravo pH Study

This new technology allows physicians to accurately measure acid reflux for 48 hrs in the esophagus and correlate the acid level in the esophagus with the symptoms.

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.

Fecal Transplant

Fecal microbiotica transplantation (FMT) involves transferring of healthy bacteria from a donor’s stool to a patient’s intestine to restore the proper balance of bacteria in the intestine so the immune system can be restored.

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. Kwak is a very thorough, professional Doctor. Her Office is about quality of patient care; not how many patients we can fit into the schedule. You will be seen on-time.
Lee
Lee
I have been a patient of Dr. Celifarco's for over 30 years. He is very knowledgeable, empathetic, and listens to all my issues and assures me everything will be ok. He has not been wrong. My husband and friends also see him and say the same as i do...i hope he never retires. Thanks for your service Dr. Celifarco.
Sheri
Sheri
Dr. Herman saved my life in 1994. He has been my gastro doctor since. Several surgeries, numerous colonoscopies he remains a valued medical advisor. He us”is smart, kind, perceptive and insightful. His staff is outstanding and he refers you to only the best. I owe my life to this guy so I cannot be objective. Simply the best.
Nick
Nick
Dr. Siegel is an exceptional physician and person. He spends all the time with you that you could need or want and is an excellent diagnostician. He helped me when others couldn't.
Anonymous
Anonymous
Made an appointment for a first time colonoscopy. I was apprehensive. Dr Kwak was wonderful She explained the preparation and procedure clearly which helped alleviate my fears. The staff is kind and caring. The day of procedure went smoothly and quickly. I highly recommend Dr. Kwak.
Anonymous
Anonymous
Dr. A. Celifarco, I know professionally and I am also his patient. Dr. Celifarco is one of the kindest people I know. He shows great compassion. He takes time to speak with you in depth if needed, and he is always upbeat and smiling. He is a competent GI doctor and has great bedside manner. Thank You Dr. Celifarco for your years of caring for me.
Michelle
Michelle
I’ve been going to Dr. Herman for 12 years now. This is a doctor that not only do I like, I trust him very much. He talks to you in the language that we can understand and makes you feel comfortable knowing the process that you’re going to be going through. I travel further just to use him. 10 stars!
Robert
Patient Testimonials
Dr. Siegel is simply the best ,saved my life and gave me the attention and care that is second to none. Very warm and caring and very giving of his time... I rate him higher than a 10 of 10 ...The only Dr. I look forward to seeing.
Phillip
Patient Testimonials
Dr. Kwak and her staff are wonderful. I felt very confident that I was in the best of care with Dr. Kwak. She is professional, knowledgeable and took the time to listen to my concerns. She made me feel very comfortable and that she has a genuine interest in my health. I received great treatment and direction from her. I highly recommend her.
Anonymous
Patient Testimonials
I have been with Dr. Celifarco over 15 years, and will follow him anywhere, great caring physician. Will visit this new location soon.
Marie
Patient Testimonials
It is rare to find a Medical Doctor who cares about his/her patients. Dr. Herman is one in a million! He knows his business, is a fantastic gastroenterologist, and has super staff members. What more can you ask for!
Sy
Patient Testimonials

Blogs
Ulcers

Signs of Stomach Ulcers

Stomach ulcers, also known as peptic ulcers, are painful sores that develop in the lining of the stomach or the first part of the small intestine. These ulcers can cause

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June 18, 2026
Diet

Will a Low-Carb Diet Help My IBS?

A low-carb diet may offer relief for those struggling with irritable bowel syndrome (IBS), a condition characterized by abdominal pain and altered bowel habits. While many individuals seek dietary solutions

Read More »
June 14, 2026
GERD

Health Complications Linked to GERD

GERD, or gastroesophageal reflux disease, is a prevalent condition affecting millions worldwide. Characterized by chronic symptoms like heartburn and acid reflux, GERD can lead to significant health complications if left

Read More »
June 10, 2026
Constipation

How to Prevent Constipation from IBS

Constipation is a common challenge for those with irritable bowel syndrome (IBS), particularly the IBS-C subtype. This condition affects millions globally, significantly impacting daily life. Understanding how to manage constipation

Read More »
June 3, 2026

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516-487-7677