HealthcareDiscovery.AI / Doctors / California / Fountain Valley / Gastroenterology

Gastroenterology in Fountain Valley, California

Data updated monthly · Last refresh September 2026

13 Gastroenterology providers practice in Fountain Valley. Listings are drawn from federal public records and are not endorsements.

Gastroenterology providers in Fountain Valley

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. Babak Firoozi, M.D.
Fountain Valley, CA · $2,032 in drug and device payments (2025) · Telehealth · (657) 241-9090
Dr. David Truong, M.D.
Fountain Valley, CA · $463 in drug and device payments (2025) · (714) 274-9969
Dr. Davinder Singh, M.D.
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 540-9911
Dr. Duke Nguyen, MD
Fountain Valley, CA · $12,048 in drug and device payments (2025) · Telehealth · (714) 378-7390
Dr. Erick Argueta, MD
Fountain Valley, CA · $1,219 in drug and device payments (2025) · (657) 241-9090
Dr. Fernando Austin, MD
Fountain Valley, CA · $527 in drug and device payments (2025) · (714) 964-6229
Dr. Jose Luis Aranez, M.D.
Fountain Valley, CA · $895 in drug and device payments (2025) · Telehealth · (657) 241-9090
Dr. Ky-dieu Tran, MD
Fountain Valley, CA · $3,212 in drug and device payments (2025) · (714) 867-4457
Dr. Lizhou Huang, M.D.
Fountain Valley, CA · $435 in drug and device payments (2025) · Telehealth · (657) 241-9090
Dr. Nancy Han, M.D.
Fountain Valley, CA · $405 in drug and device payments (2025) · Telehealth · (657) 241-9090
Dr. Richard Zelner
Fountain Valley, CA · No drug or device payments recorded (2025) · (657) 241-9090
Dr. Ronald Policastro, M.D.
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 962-7705
Dr. Vincent Kao, DO
Fountain Valley, CA · $741 in drug and device payments (2025) · Telehealth · (657) 241-9090

Conditions Gastroenterology providers in Fountain Valley, 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.

Common questions

How many Gastroenterology providers are in Fountain Valley, California?

There are 13 Gastroenterology providers with active NPI records practicing in Fountain Valley, according to federal NPPES data refreshed monthly.

What conditions do Gastroenterology providers in Fountain Valley treat?

Gastroenterology providers in Fountain Valley 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 Fountain Valley Gastroenterology across California

Try a city like Tucson, a zip like 85016, or a specialty like psychiatry. For a doctor by name, use the full search.
Sources: NPPES (CMS), Doctors and Clinicians national files, CMS Open Payments 2025. Updated monthly. Records are public federal data and are not verified credentials, licensure checks, or endorsements. This directory is informational and not medical advice. How we build this directory.