Gastroenterology in Fullerton, California
Data updated monthly · Last refresh September 2026
9 Gastroenterology providers practice in Fullerton. Listings are drawn from federal public records and are not endorsements.
Gastroenterology providers in Fullerton
Listed alphabetically. Payment figures come from the federal Open Payments program, which requires drug and device companies to report what they pay physicians for consulting, speaking, meals, travel and royalties. A disclosed payment is a financial relationship, not evidence of wrongdoing, and many totals reflect a single meal. Figures cover calendar year 2025.
Dr. Eugene Yoon, M.D.Fullerton, CA · $3,464 in drug and device payments (2025) · Telehealth ·
(714) 446-5831 Dr. Kumkum Patel, M.D., MPHFullerton, CA · $94,365 in drug and device payments (2025) ·
(714) 446-5831 Dr. Martin Carr, M.D.Fullerton, CA · $23 in drug and device payments (2025) ·
(714) 446-5831 Dr. Patrick Koo, MDFullerton, CA · $1,709 in drug and device payments (2025) · Telehealth ·
(714) 446-5831 Dr. Richard Mcguire, M.D.Fullerton, CA · $76 in drug and device payments (2025) ·
(714) 990-0911 Dr. Sajen Mathews, MDFullerton, CA · $2,430 in drug and device payments (2025) · Telehealth ·
(714) 446-5831 Dr. Scott Sainburg, M.D.Fullerton, CA · $1,986 in drug and device payments (2025) · Telehealth ·
(714) 446-5831 Dr. Vijay Prabhakar, M.D.Fullerton, CA · $1,920 in drug and device payments (2025) · Telehealth ·
(714) 446-5831 Dr. Yeeshun Miao, M.D.Fullerton, CA · $766 in drug and device payments (2025) ·
(714) 626-8610 Conditions Gastroenterology providers in Fullerton, California commonly treat
Patients often search by condition rather than specialty. These are conditions typically managed by Gastroenterology providers. Individual practices vary, so confirm with the provider before booking.
- Acid reflux
- IBS
- Crohn disease
- Ulcerative colitis
- Celiac disease
- Colon cancer screening
Common questions
How many Gastroenterology providers are in Fullerton, California?There are 9 Gastroenterology providers with active NPI records practicing in Fullerton, according to federal NPPES data refreshed monthly.
What conditions do Gastroenterology providers in Fullerton treat?Gastroenterology providers in Fullerton commonly treat acid reflux, IBS, Crohn disease, ulcerative colitis, celiac disease and related conditions. Individual practices vary, so confirm with the provider before booking.
Where does this data come from?Provider records come from the federal NPPES registry and CMS Doctors and Clinicians files. Payment figures come from the CMS Open Payments program for calendar year 2025. The directory refreshes monthly.
All specialties in Fullerton Gastroenterology across California