Kalamazoo Endo Center of Portage, an ambulatory surgical center jointly owned by Gastroenterology of Southwest Michigan and Physicians Endoscopy has recently been awarded top accreditation by the Accreditation Association for Ambulatory Health Care, Inc. (AAAHC). Kalamazoo Endo Center, which opened in March of 2006, offers comprehensive gastroenterological services through most insurance plans.