The Greenwood Endoscopy Center offers a safe, comfortable, easily accessible environment for Colonoscopy and Upper Endoscopy at about one-fourth the cost of a traditional hospital outpatient setting. Over 11,000 procedures performed last year! ... Our Patient Portal. We have a new Patient Portal.Why Gi Specialists‧Contact Us‧Your Office Visit‧In the News‧Endoscopy Center‧Forms & Resources.