Sergio Crespo, MD | The Oregon Clinic Sergio Crespo, MD Gastroenterology Hepatology (Liver Disease) 503-297-8081 Areas of Focus: Colon Cancer Screening & Prevention Disease of the Liver & Biliary Tract Hepatology Gastroesophageal Reflux Disease (GERD) Inflammatory Bowel Disease (IBD) Request an Appointment Refer a Patient About Me My Work.