Refer a patient to the Digestive Health Institute It's easy to refer your patient to the UCI Health Digestive Health Institute. Simply complete and fax the appropriate referral form below. Please include supporting documentation. Colonoscopy, diagnostic gastroenterology and hepatology patient referral form › Gastrointestinal and bariatric surgery patient referral form › Interventional gastroenterology patient referral form › We look forward to serving you and your patients. For more information about physician referrals and patient appointments, please call 888-717-4463.