Welcome to Katy Gastroenterology PA. There are three gastroenterologists in our group covering the area of West Houston, between the Memorial area and Katy. Drs. Andrzej J. Janecki, Kevin Marks and Radha Tamerisa are all Board Certified in Gastroenterology and Hepatology as well as in General Internal Medicine. Our practice provides a full range of healthcare services in the fields of gastroenterology, hepatology, and nutrition.