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The oldest and most prestigious gastrointestinal practice

in the South Bay region of Los Angeles

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Colon cancer screening is recommended

for both men and women starting at age 50

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Our friendly staff

are here to help

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We specialize in IBD, IBS and all

aspects of women’s gastrointestinal health

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Serving the South Bay for

forty years

Welcome To South Bay Gastroenterology

South Bay Gastroenterology Medical Group is the oldest and most prestigious gastroenterology practice in the South Bay region of Los Angeles.

Our teams of physicians are skilled at treating all aspects of digestive disorders and liver disease utilizing the most sophisticated and technically advanced methods.  Our physicians are from some of the finest training programs in the country and are committed to providing our patients with excellent compassionate care.

The practice is affiliated with the Endoscopy Center of the South Bay, the first state licensed free standing endoscopy center in California.  Our state of the art facility is approved and certified by both Medicare and the State of California as an ambulatory surgery center (ASC).  Virtually all gastrointestinal endoscopic procedures are performed at the Endoscopy Center of the South Bay including colon cancer surveillance.

South Bay Gastroenterology Medical Group is a participating provider for Medicare and most PPO contracts in Southern California.  The physicians are members of Torrance Hospital IPA (THIPA) and Torrance Memorial Integrated Physicians (TMIP).  We use both Little Company of Mary and Torrance Memorial as our two inpatient facilities.

We are dedicated to providing excellence in quality gastroenterology care, endoscopic expertise and serving the needs of our community to promote gastrointestinal health and wellness.


South Bay Gastroenterology Medical Group physicians have hospital privileges at the following hospitals:

Torrance Memorial Medical Center
3330 Lomita Blvd.
Torrance, CA 90505
Click Here for Map
(310) 325-9110
Little Company of Mary Hospital
4101 Torrance Blvd.
Torrance, CA 90503
Click Here for Map
(310) 540-7676


Dr. Chan attended the California Institute of Technology graduating with honors in B.S. in Biology. She then went on to the East Coast to the John’s Hopkins School of Medicine for medical school. She underwent an internal medicine internship and residency at Barnes Hospital which is affiliated with the Washington University School of Medicine in St. Louis. And coming back full circle to Los Angeles, she finished up with a gastroenterology fellowship at UCLA Medical Center in 1994. Since that time she has been in private practice with the South Bay Gastroenterology Medical Group.

Dr. Cohen is a board certified gastroenterologist. He specializes in all aspects of gastrointestinal disease, including the liver and pancreas. He has practiced in the south bay for over 25 years. He is currently the Principal Investigator on many of our ongoing research studies

Dr. Lee is a board certified gastroenterologist who specializes in all aspects of gastrointestinal and liver disorders. He has a special interest in viral hepatitis and has dedicated his practice toward advanced diagnostic and therapeutic endoscopy. After graduating from high school in 1990, Dr. Lee was accepted into the Integrated B.A./M.D. Honors Program in Medical Education at Northwestern University in Evanston, Illinois.

Dr. Panitch is a gastroenterologist who is a specialist in all aspects of gastrointestinal disorders. He has been recognized as a leader in both diagnostic and therapeutic endoscopy and colonoscopy. After graduating from Brooklyn College in Brooklyn, New York in 1964, Dr. Panitch went on to completehis medical training at Meharry Medical College in Nashville, Tennessee.

Dr. Piken is a gastroenterologist who treats all aspects of gastrointestinal and liver disease. He has been recognized as a leader in both treatment and research in both liver disease and inflammatory bowel diseases including Crohn’s disease and ulcerative colitis. Dr. Piken attended New York University from..

Dr. Sze studied Biochemistry at UCLA and graduated from USC school of Medicine. She did her intenal Medicine internship and residency at Los Angeles County-USC Medical Center, where she also completed her fellowship in Gastrointestinal and Liver Diseases. She was a clinical instructor at University of Irvine Medical Center where she also underwent advance fellowship training in Endoscopic Ultrasound.

A native southern Californian, Dr. Oren Zaidel received his Bachelor of Arts from the University of California at Berkeley. He then returned to southern California and received his medical degree from the Keck School of Medicine at USC

Wendy Ard has been a physician assistant for over 30 years with broad clinical experience in both private practice and academic settings. She started her career in Gastroenterology and then practiced in internal medicine, cardiology, and primary care before returning to G.I medicine.

Dr. Nguyen received his medical degree from the University of Vermont College of Medicine in 2007. He completed his internship and residency at Cedars-Sinai Medical Center from 2007-2010, and served as Chief Resident from 2010-2011. He then completed his gastroenterology fellowship at Loyola University Medical Center in Maywood, IL from 2011-2014, and also served as Chief Fellow in his final year. He returned to California to complete an Advanced Fellowship in Inflammatory Bowel Disease at Cedars-Sinai Medical Center from 2014-2015 before joining the South Bay Gastroenterology Medical Group.

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