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 › Digestive disease 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.