Currently, Zazen Medical Group specializes in Gastroenterology and Internal Medicine with 1 physician. Zazen Medical Group Office Locations. Zazen Medical Group. 25230 Kingsland Blvd Katy, TX 77450 ... Accepting New Patients: Yes. Medicare Accepted: Yes. Medicaid Accepted: No. Physicians at this location. Vivian Abenaa Asamoah, MD.