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Gastroenterologists in California

Data updated monthly · Last refresh October 2026

2,135 Gastroenterology providers practice in California, including 918 (43%) offering telehealth. The largest concentration is in Los Angeles. Profiles include federal Open Payments records of money received from drug and device companies in 2025. Listings are drawn from federal public records and are not endorsements.

2,135providers
918telehealth
Los Angelestop city

Gastroenterology by city in California

Choose a city to see providers there.

Gastroenterology in Los Angeles195 providers
Gastroenterology in San Diego126 providers
Gastroenterology in San Francisco103 providers
Gastroenterology in Sacramento89 providers
Gastroenterology in Stanford63 providers
Gastroenterology in San Jose46 providers
Gastroenterology in Orange45 providers
Gastroenterology in Torrance44 providers
Gastroenterology in Fresno41 providers
Gastroenterology in La Jolla36 providers
Gastroenterology in Loma Linda33 providers
Gastroenterology in Walnut Creek33 providers
Gastroenterology in Palo Alto29 providers
Gastroenterology in Oakland27 providers
Gastroenterology in Fremont26 providers
Gastroenterology in Santa Monica26 providers
Gastroenterology in West Hollywood26 providers
Gastroenterology in Anaheim25 providers
Gastroenterology in Newport Beach23 providers
Gastroenterology in Beverly Hills23 providers
Gastroenterology in Riverside22 providers
Gastroenterology in Irvine22 providers
Gastroenterology in Modesto21 providers
Gastroenterology in Santa Rosa19 providers

Gastroenterology providers in California

Listed by city, largest first. 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. Khushal Stanisai, MD
Redlands, CA · No drug or device payments recorded (2025) · (909) 796-0363
Dr. Beverly Chen, M.D.
Redondo Beach, CA · No drug or device payments recorded (2025) · (310) 937-8555
Dr. Betty Ho, M.D.
Redwood City, CA · $29 in drug and device payments (2025) · (650) 365-2911
Dr. Christina Dimopoulos-verma, MD
Redwood City, CA · $96 in drug and device payments (2025) · (650) 721-6190
Dr. Cynthia Leung, MD
Redwood City, CA · $2,290 in drug and device payments (2025) · Telehealth · (650) 365-3700
Dr. Francis Chui, MD
Redwood City, CA · No drug or device payments recorded (2025) · (650) 299-2000
Dr. Henry Chun, MD
Redwood City, CA · No drug or device payments recorded (2025) · (650) 299-2000
Dr. James Torosis, M.D.
Redwood City, CA · $1,803 in drug and device payments (2025) · Telehealth · (650) 365-3700
Dr. Madhuri Badrinath
Redwood City, CA · $264 in drug and device payments (2025) · Telehealth · (650) 365-3700
Dr. Ming-shing Chiu, MD
Redwood City, CA · No drug or device payments recorded (2025) · (650) 299-2000
Dr. Phillip Chen, MD
Redwood City, CA · $638 in drug and device payments (2025) · (310) 267-7849
Dr. Susan Cummings, MD
Redwood City, CA · $565 in drug and device payments (2025) · Telehealth · (650) 365-3700
Dr. Vicky Yang, M.D.
Redwood City, CA · $1,704 in drug and device payments (2025) · Telehealth · (650) 365-3700
Dr. Vivian Ng, M.D.
Redwood City, CA · No drug or device payments recorded (2025) · (650) 299-2537
Dr. Yejoo Jeon
Redwood City, CA · $192 in drug and device payments (2025) · (650) 299-2537
Dr. Anas Kawayeh, M.D.
Rialto, CA · $619 in drug and device payments (2025) · (909) 883-2999
Dr. Carlos Buitrago, MD
Rialto, CA · $891 in drug and device payments (2025) · (909) 644-4063
Dr. Karen Chang, DO
Rialto, CA · $787 in drug and device payments (2025) · (909) 644-4035
Dr. Kumaravelu Balasubramaniam, MD
Rialto, CA · $334 in drug and device payments (2025) · (909) 881-3032
Dr. Victor Guharoy, MD
Rialto, CA · $579 in drug and device payments (2025) · (909) 644-4033
Dr. Ali Syed, M.D.
Ridgecrest, CA · $130 in drug and device payments (2025) · (760) 446-3551
Dr. Eric Frey, M.D.
Ridgecrest, CA · $17 in drug and device payments (2025) · (760) 446-0121
Dr. James Hwang, MD
Ridgecrest, CA · $254 in drug and device payments (2025) · (760) 446-0121
Dr. Maurice Dusol, M.D.
Ridgecrest, CA · No drug or device payments recorded (2025) · (760) 446-6404
Dr. Adam Chen, MD
Riverside, CA · No drug or device payments recorded (2025) · (909) 353-2000
Dr. Anil Garde, MD
Riverside, CA · $1,117 in drug and device payments (2025) · (951) 697-5669
Dr. Charles Chaya, M.D.
Riverside, CA · $23 in drug and device payments (2025) · (951) 353-5538
Dr. Eiei Soe, M.D.
Riverside, CA · No drug or device payments recorded (2025) · (951) 353-2000
Dr. Eric Choi, M.D.
Riverside, CA · $248 in drug and device payments (2025) · (951) 697-5464
Dr. Galen Huang, MD
Riverside, CA · $1,335 in drug and device payments (2025) · Telehealth · (951) 788-1450
Dr. James Ma, MD
Riverside, CA · $53 in drug and device payments (2025) · (909) 353-2000
Dr. James Wang, MD
Riverside, CA · No drug or device payments recorded (2025) · (909) 353-2000
Dr. John Pyne, MD
Riverside, CA · No drug or device payments recorded (2025) · (909) 353-2000
Dr. Jyothi Reddy, MD
Riverside, CA · $248 in drug and device payments (2025) · (951) 354-3976
Dr. Michael Baek, D.O.
Riverside, CA · No drug or device payments recorded (2025) · (951) 321-6475
Dr. Peerapol Wangrattanapranee, MD
Riverside, CA · $120 in drug and device payments (2025) · (909) 475-2612
Dr. Pejman Solaimani, M.D
Riverside, CA · $694 in drug and device payments (2025) · (951) 224-9100
Dr. Philip Chen, MD
Riverside, CA · $647 in drug and device payments (2025) · Telehealth · (951) 321-6345
Dr. Ravi Thiruvengadam, MD
Riverside, CA · No drug or device payments recorded (2025) · Telehealth · (951) 788-7805
Dr. Rawel Randhawa, M.D.
Riverside, CA · No drug or device payments recorded (2025) · (623) 262-1171
Dr. Robert Wen, MD
Riverside, CA · No drug or device payments recorded (2025) · (909) 353-2000
Dr. Roger Sayegh, MD
Riverside, CA · No drug or device payments recorded (2025) · (909) 353-2000
Dr. Ronald Ortizo
Riverside, CA · $57 in drug and device payments (2025) · (951) 697-5464
Dr. Sharmila Patel, MD
Riverside, CA · $27 in drug and device payments (2025) · (951) 321-6354
Dr. Thu Pham, M.D.
Riverside, CA · $274 in drug and device payments (2025) · (951) 782-3615
Dr. Vinod Mishra, MD
Riverside, CA · $873 in drug and device payments (2025) · Telehealth · (951) 784-6790
Dr. Loren Fefer, M.D.
Rocklin, CA · No drug or device payments recorded (2025) · (916) 295-5700
Dr. Ramin Bagheri, M.D.
Rocklin, CA · $644 in drug and device payments (2025) · Telehealth · (916) 983-4444
Dr. Vadim Bul
Rocklin, CA · $669 in drug and device payments (2025) · Telehealth · (916) 465-7029
Dr. Steve Nguyen, D.O.
Rosemead, CA · No drug or device payments recorded (2025) · (626) 316-8169

Conditions Gastroenterology providers in 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 California?

There are 2,135 Gastroenterology providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.

Do Gastroenterology providers in California offer telehealth?

Yes. 918 of the 2,135 Gastroenterology providers in California (about 43%) report offering telehealth services in CMS data.

Which cities in California have the most Gastroenterology providers?

Los Angeles (195), San Diego (126), San Francisco (103) have the highest concentration of Gastroenterology providers in California.

How many Gastroenterology providers in California received drug or device company payments?

1,329 of 2,135 Gastroenterology providers in California (62%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.

What conditions do Gastroenterology providers in California treat?

Gastroenterology providers 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 counts and profiles 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.

Do most Gastroenterologists in California work in independent practices or large health systems?

Among 1,498 Gastroenterologists in California enrolled in Medicare, 21% bill through a solo or small practice with fewer than 10 clinicians, 8% through a mid-size group of 10 to 99, and 71% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.

Which hospitals do Gastroenterologists in California work at?

According to CMS facility affiliation records, the California hospitals where the most Gastroenterologists hold privileges are Stanford Health Care in Stanford; Ronald Reagan UCLA Medical Center in Los Angeles; Cedars-Sinai Medical Center in Los Angeles.

Related reading on HealthcareDiscovery.AI

Gastroenterology in all 50 states Search all 2,135 in the directory Ask Zach for help choosing

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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. Are you a Gastroenterology in California? Get featured.