Houston Gastro Institute Doctors - Gastroenterology Houston Gastro Institute Visit Website Request Info 25230 Kingsland Blvd, Suite 101 Katy, TX 77494 (281) 746-9284 (832) 437-3206 (fax) Hours: Monday through Friday 8:30am to 5:00pm About Map About We Provide Sustainable, Long-Lasting, Solutions For Your Digestive Health.At ZAZEN, we strive to help you feel better by balancing conventional medical know-how with alternate therapeutic approaches. What's Nearby? Distance: 5 10 15 20 25 50 mi.