HealthcareDiscovery.AI / Doctors / California / Gastroenterology

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. Alejandro Lopez
San Francisco, CA · $144 in drug and device payments (2025) · (787) 806-6380
Dr. Allyson Richardson, MD
San Francisco, CA · $684 in drug and device payments (2025) · Telehealth · (415) 502-4444
Dr. Andrew Nett, M.D.
San Francisco, CA · $18 in drug and device payments (2025) · (415) 600-1151
Dr. Angela Lam
San Francisco, CA · No drug or device payments recorded (2025) · (415) 833-2000
Dr. Annette Kwon, MD
San Francisco, CA · $3,730 in drug and device payments (2025) · Telehealth · (415) 923-3050
Dr. Annsa Huang, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 221-4810
Dr. Aristotle Mendiola, M.D.
San Francisco, CA · $1,280 in drug and device payments (2025) · Telehealth · (415) 387-8800
Dr. Averil Ma, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 502-9405
Dr. Benjamin Yip, MD
San Francisco, CA · $1,253 in drug and device payments (2025) · Telehealth · (415) 600-4025
Dr. Brock Macdonald, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 476-2777
Dr. Bruce Wang, M.D.
San Francisco, CA · $26,590 in drug and device payments (2025) · Telehealth · (415) 476-2777
Dr. Cathleen Cabansag, MD
San Francisco, CA · $1,548 in drug and device payments (2025) · Telehealth · (415) 749-6900
Dr. Charlotte Ching, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 502-4444
Dr. Cheikh Njie, MD
San Francisco, CA · $120 in drug and device payments (2025) · Telehealth · (415) 502-4444
Dr. Christian Mathy, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 502-4444
Dr. Christina Chou, MD
San Francisco, CA · $541 in drug and device payments (2025) · (415) 600-1000
Dr. Christopher Hamerski, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 600-1151
Dr. Colin Feuille
San Francisco, CA · $133 in drug and device payments (2025) · (628) 206-8000
Dr. Connie Wang
San Francisco, CA · $981 in drug and device payments (2025) · Telehealth · (415) 476-1528
Dr. Courtney Gonzales, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 476-1528
Dr. Dayana Carcamo-molina, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 600-3954
Dr. Dean Rider, MD
San Francisco, CA · $189 in drug and device payments (2025) · (415) 658-7497
Dr. Dennis Shen, MD
San Francisco, CA · $170 in drug and device payments (2025) · (415) 292-3313
Dr. Douglas Corley, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 833-2000
Dr. Edward Doo, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 600-1111
Dr. Elizabeth Ross, M.D.
San Francisco, CA · $22 in drug and device payments (2025) · (415) 833-2000
Dr. Fernando Velayos, MD
San Francisco, CA · $154 in drug and device payments (2025) · (415) 502-4444
Dr. Francis Yao, MD
San Francisco, CA · $25,136 in drug and device payments (2025) · Telehealth · (415) 353-2318
Dr. Gerald Roberts, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 929-0600
Dr. Gregory Fung, MD
San Francisco, CA · $46 in drug and device payments (2025) · Telehealth · (415) 982-6691
Dr. Hal Yee, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 206-8822
Dr. Harvey Watts, M.D.
San Francisco, CA · $115 in drug and device payments (2025) · Telehealth · (415) 759-2121
Dr. Jacquelyn Maher, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 206-8822
Dr. Jagrati Mathur, MD
San Francisco, CA · $30 in drug and device payments (2025) · (415) 379-2980
Dr. James Allison, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 206-8822
Dr. James Ostroff, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 502-2112
Dr. James Ryan, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 750-2105
Dr. James Yan, D.O.
San Francisco, CA · $1,135 in drug and device payments (2025) · (415) 781-1818
Dr. Jane Melnick, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 923-3577
Dr. Jeanne-marie Giard
San Francisco, CA · No drug or device payments recorded (2025) · (415) 476-3143
Dr. Jeffrey Baumgardner, MD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 206-8823
Dr. Jennifer Chen, MD
San Francisco, CA · $25 in drug and device payments (2025) · Telehealth · (415) 502-4444
Dr. Jesse Liu, MD
San Francisco, CA · $2,604 in drug and device payments (2025) · (415) 387-8800
Dr. John Cello, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 353-1702
Dr. John Wang
San Francisco, CA · $1,797 in drug and device payments (2025) · Telehealth · (415) 387-8800
Dr. Jonathan Pritikin, MD
San Francisco, CA · $80 in drug and device payments (2025) · (415) 833-2000
Dr. Jonathan Terdiman, MD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 502-4444
Dr. Joseph Chen, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 443-4692
Dr. Justin Louie, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 833-4983
Dr. Justin Sewell, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 206-4575

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.

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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.