Atherton Endoscopy Center
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Atherton Endoscopy Center
The Atherton Endoscopy Center is a state of the art, free standing, endoscopy center located in Atherton, California. We are dedicated solely to the care of Gastroenterology patients and the diagnosis, treatment and prevention of gastrointestinal disease. Opened in 2003 we are certified by Medicare and the AAAHC.

In addition, we are recognized by the ASGE for promoting quality in endoscopy. Our focus is on providing our patients with the utmost quality of care in a convenient, friendly and comfortable atmosphere. We are dedicated to the highest standards of endoscopic care.
Services
While you are a patient at Atherton Endoscopy Center our highly competent and professional staff will care for you. Everyone from the receptionist to the Physician embraces our philosophy of patient focused care. Above all our staff is friendly and concerned for your comfort. All of our nursing staff receive extensive orientation and training in the field of Gastroenterology.
Dr. Torosis is a native of Montreal, Canada and founded Peninsula Gastroenterology Medical Group in 1986. Dr. Torosis attended medical school and internship at McGill University in Montreal. In 1982 Dr. Torosis moved to California where he completed his internal medicine residency in San Diego. He attended Yale University for his fellowship in Gastroenterology and Liver Diseases.
Dr. Yang is a native of Taiwan and moved to California after high school. She attended college in Los Angeles and graduated medical school from Northwestern University in Chicago. Dr. Yang moved to the Bay Area for her post-graduate medical training and completed her internal medicine residency at Santa Clara Valley Medical Center.
Great staff, great doctor. Everyone made sure that I was warm and comfortable. There is always the risk that when you do this all the time, you could become insensitive to the patient. I was delighted that this was not so, in fact, it was just opposite. Everyone was really friendly and helpful. I never once felt discomfort throughout the whole thing and the sedation was very effective!
Atherton Endoscopy Center requires that you have a responsible adult accompany you home and inside your house after your procedure. You will not be allowed to drive yourself home or to take a taxi, Uber, Lyft, county bus, Care Advantage, Redi-Wheels or any type of public transportation. Your procedure will be canceled unless you have an appropriate ride home.
Reviews (3)
Ronald MacLennan
Ronald MacLennan
Jan 24, 2022
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Dr. Rengstorff and assistants were exceptional! Very professional and clean facility. My colonoscopy procedure was perfect! Thank you to Dr. Rengstorff and his staff.
Gabriele Stahl
Gabriele Stahl
Aug 03, 2019
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A thousand stars. The staff and Dr. Torosis are just wonderful people from their hearts. They really cared about me and kept me comfortable at all times. When they talked with me they were fully present. It wasn't just an act to keep me entertained. We think of a colonoscopy as an unpleasant procedure but the team made it extremely manageable.
Martin Saso
Martin Saso
Sep 10, 2018
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I found this organization to be truly world-class in every way...I would give them a 10 star rating!!! I found them to be sensitive to the patient, caring, most proficient, knowledgable and effective in every way...