Ronnie Fass MD
Esophagus Disease, Gastrointestinal Functional & Motility Disorders
Professor of Medicine, Case Western Reserve University
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2500 Metrohealth DrCleveland, OH 44109
Phone+1 216-778-8423
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Summary
- Ronnie Fass, MD, is a gastroenterologist based in Cleveland, OH, specializing in esophagus disease and gastrointestinal functional and motility disorders. Dr. Fass completed a residency in internal medicine at the University of Arizona College of Medicine-Tucson and a gastroenterology fellowship at UCLA. Dr. Fass has experience in managing conditions such as gastroesophageal reflux, irritable bowel syndrome, squamous cell carcinoma of the esophagus, esophageal disease, and Barrett's esophagus. Publications include studies on gastroesophageal reflux disease and small intestinal bacterial overgrowth. Dr. Fass has also been involved in clinical trials focused on gastroesophageal reflux disease treatments. In 1999, Dr. Fass was recognized as a Fellow by the American College of Physicians.
Education & Training
UCLA David Geffen School of Medicine/UCLA Medical CenterFellowship, Gastroenterology, 1993 - 1995
University of Arizona College of Medicine-TucsonResidency, Internal Medicine, 1989 - 1993
Ben Gurion University of the NegevClass of 1989
Certifications & Licensure
CA State Medical License 1993 - Present
AZ State Medical License 1992 - 2027
OH State Medical License 2012 - 2027
American Board of Internal Medicine Gastroenterology
Awards, Honors, & Recognition
- Fellow (FACP) American College of Physicians, 1999
Clinical Trials
- Role of Pain Modulation in GERD Patients Who Failed Standard Dose Proton Pump Inhibitors (PPI) Start of enrollment: 2005 Mar 01
- Safety and Efficacy of AST-120 in Patients With GERD Who Continue to be Symptomatic on a Standard Dose of PPI Start of enrollment: 2007 Oct 01
- Effect of Pantoprazole 40mg Daily vs Placebo on Power Spectral Analysis of the Sleep EEG of Patients With GERD. Start of enrollment: 2008 Apr 01
Publications & Presentations
PubMed
- Functional Esophageal Disorders.C Prakash Gyawali, Sabine Roman, Frank Zerbib, Edoardo V Savarino, Shobna Bhatia
Gastroenterology. 2026-05-01 - Dysphagia is Associated With the Combination of Defective Bolus Transit and Poorly Relaxing Lower Esophageal Sphincter in Patients With Ineffective Esophageal Motility.Abdel-Jalil Ala, Thai Hau Koo, Ronnie Fass
Journal of Neurogastroenterology and Motility. 2026-04-30 - A systematic review and meta-analysis of randomized controlled trials: the effect of potassium-competitive acid blockers on nighttime symptoms of gastroesophageal refl...Thai Hau Koo, Ronnie Fass
Esophagus. 2026-04-01
Lectures
- Approach to the Patient With Refractory Esophageal SymptomsAGC 2018 Annual Scientific Meeting, Philadelphia, PA - 10/6/2018
Other
- Evaluation of dysphagia in adultsFass R
http://www.uptodate.com/contents/evaluation-of-dysphagia-in-adults
UpToDate, Wolters Kluwer Health - 2013-02-22 - Approach to refractory gastroesophageal reflux disease in adultsFass R
http://www.uptodate.com/contents/approach-to-refractory-gastroesophageal-reflux-disease-in-adults
UpToDate, Wolters Kluwer Health - 2013-04-03
Press Mentions
Highlights From DDW 2025, Part 1: GERD Treatment Efficacy and Cost-EffectivenessJuly 14th, 2025- Reflux Symptom Reporting, Zastaprazan for EE, PPIs and CV OutcomesMay 13th, 2025
- Closing the Door on Barrett’s: The Critical Role of Reflux Control in EET OutcomesMarch 21st, 2025
Professional Memberships
- Fellow
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