Gastroenterology
David Diehl, M.D.
Clinical Professor of Medicine and Pathology; Department of Gastroenterology, Geisinger Medical Center
David L. Diehl, MD, is a board-certified gastroenterologist at Geisinger Medical Center in Danville, Pennsylvania, with over 40 years of experience specializing in advanced endoscopy. His clinical expertise centers on pancreaticobiliary diseases, esophageal disorders, and biliary tract conditions, treating patients with pancreatic disease, gastroesophageal reflux, Barrett's esophagus, and complications requiring complex interventions. Dr. Diehl excels in advanced endoscopic techniques, including
40+
Years in Practice
Credentials
Board Certifications
- Gastroenterology (American Board of Internal Medicine)
- Internal Medicine (American Board of Internal Medicine)
Education & Training
- University of California at San Francisco — Fellowship, Gastroenterology, 1987-1988
- UCLA School of Medicine — Fellowship, 1988-1990
- Harbor/UCLA Medical Center — Residency, Internal Medicine, 1984-1987
- Harbor/UCLA Medical Center — Internship, 1983-1984
- University of California Los Angeles / Center for Health Sciences — M.D., 1983
Peer Recognition
- ASGE — Master Endoscopist
2025
- ASGE — Distinguished Endoscopic Research Mentoring Award
2020
Clinical Focus
Subspecialties
Conditions & Treatments
Practice Details
Hospital Affiliations
- Geisinger Medical Center
Languages
English
Experience
40+ years in practice