Welcome to GI Health - Gastroenterologists in New York City

Welcome to GI Health, where you can experience “the future of digestive health, today!” We specialize in and treat a variety of gastrointestinal (GI) conditions and liver issues as well as advocate proactive maintenance of digestive health. Upper and lower endoscopies are performed on site at our state-of-the-art facility, an Accredited Office Based Surgical Facility (OBS). We are conveniently located in Downtown New York City near Chinatown and SoHo.

Quality is not just a catchphrase at GI Health. It exists as both the bedrock of our practice, and as the blanket in the care and comfort we provide for each and every patient. Our goal is to continue this high level of care, throughout the process of developing great relationships with each individual that comes to us for consultation, upper endoscopy or colonoscopy. We hope to meet you soon!

Welcome to New York City! We're sorry you got sick with food poisoning.

Hello and welcome to New York City!  If you are a tourist visiting from another country (England, Europe, China, Japan, Russia, Spain or anywhere in the world) and find yourself in need of a doctor, please call us.

We are conveniently located in downtown New York City, near Chinatown, SOHO, Tribeca, Financial District, Battery Park City, City Hall and the World Trade Center).  While shopping for Gucci or Luis Vuitton bags and Cartier or Rolex watches, you may become sick with fatigue, weakness, fever, food poisoning, or perhaps just need a refill of your prescription medications.

Gastroenterologists in NYC

Read Dr. Anthony Ng's interview in this recent US News and World Report Article.

Service Highlights

Now Offering PillCam SB 3 Capsule Endoscopy

We are extremely excited to announce that our facility is now using PillCam® capsule endoscopy technology to non-invasively visualize abnormalities of the gastrointestinal (GI) tract. The disposable capsule is approximately the size of a vitamin and is swallowed by the patient at our facility. As the capsule naturally passes through the GI tract, it wirelessly transmits images to a data recorder worn by the patient. The exam also doesn’t require sedation or radiation that is common with other GI exams.

We feel that this innovative technology will have a profound impact on patients who suffer from a wide variety of GI conditions. We are currently using PillCam® SB capsule endoscopy, a sedation-free technology designed to examine the small bowel to visualize lesions associated with conditions like Crohn’s disease, iron deficiency anemia and obscure GI bleeding. Our facility also offers PillCam® ESO capsule endoscopy to visualize abnormalities in the esophagus.

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Anthony J. Ng, M.D.

Dr. Anthony J. NgGI Health was established in 2002 after Dr. Anthony J Ng completed his fellowship of Gastroenterology at the prominent Mount Sinai Hospital. U.S. News & World Report ranks Mount Sinai Hospital among the top hospitals nationwide. Mount Sinai also ranks top 10 in several specialties, and Gastroenterology is ranked #9 nationwide. Prior to his fellowship training, Dr. Ng completed his internship and residency in Internal Medicine at the prestigious Beth Israel Deaconess Medical Center, a major Harvard Medical School Teaching Hospital. Dr. Ng has a special interest and expertise in the prevention of gastric, colon and liver cancers. He is a highly skilled endoscopist, employing the latest cutting-edge equipment. He is also an experienced treater of Hepatitis B and is an expert speaker in this topic. Dr. Ng is interested in bridging the gap between scientific, evidence-based western medicine and the more holistic and integrative approaches of the east.

Meet Dr. Anthony J. Ng

Dennis Demeria, MD

Denny D. Demeria, B.Sc., M.D., F.R.C.P.CPlease join us in welcoming Dr. Demeria to GI Health! Dr. Demeria is a former Assistant Professor of Medicine in the Division of Gastroenterology and Hepatology at the Queen’s University in Kingston, Ontario, Canada. Dr. Demeria completed his medical school training at the University of Saskatchewan and his residency training at the University of Alberta, in Canada, where he also completed his Gastroenterology Fellowship training, before finally completing a Post-Doctoral Fellowship there as well in Hepatology.

Meet Dr. Dennis Demeria

Yixiu Zheng, MD

Dr. Yixiu ZhengDr. Yixiu Zheng is an internist and specializes in weight loss treating patients in New York City and the surrounding communities. Her primary goal as a practitioner is to ensure that each of her patients receives the highest available quality of medical care. She holds certification from the American Board of Internal Medicine and American Board of Obesity Medicine. Dr. Zheng is also affiliated with the Beth Israel Medical Center and New York Hospital of Queens.

Meet Dr. Yixiu Zheng

Citizenship and Immigration Canada


All immigrants and some visitors need to undergo a medical examination before receiving a visa. The Citizenship and Immigration Dept of Canada has designated certain doctors in each region, authorized to perform the immigration medical exams.

Dr. Anthony Ng is a designated Panel Physician for Canadian Immigration Exams.

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Career opportunities

We are frequently looking for energetic, compassionate and well-qualified people to join our team here at GI Health. We are a well-established and rapidly growing Practice serving lower Manhattan as well as Queens and Brooklyn.

Join Our Team

Office Location

139 Centre Street, Suite 611
New York, NY 10013

(212) 431-4309
(646) 506-4763

Make An Appointment

Office Hours

Monday 8:30 am - 4:30 pm
Tuesday 8:30 am - 4:30 pm
Wednesday 8:30 am - 4:30 pm
Thursday 10:00 am - 6:00 pm
Friday 10:00 am - 6:00 pm
Saturday 8:30 am - 4:30 pm
Sunday Closed

Map & Directions

GI News From Our GI Doctors

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