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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. Yen Quang, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 885-8080
Dr. Yongyan Cui
San Francisco, CA · No drug or device payments recorded (2025) · (415) 600-1151
Dr. Chester Zahn, MD
San Gabriel, CA · $183 in drug and device payments (2025) · Telehealth · (626) 287-7222
Dr. Dana Pan, MD
San Gabriel, CA · $3,579 in drug and device payments (2025) · Telehealth · (626) 898-4560
Dr. Robert Mehler, M.D.
San Gabriel, CA · No drug or device payments recorded (2025) · (626) 281-7461
Dr. Ahmad Kamal, MD
San Jose, CA · No drug or device payments recorded (2025) · (408) 885-5000
Dr. Alan Chin, MD
San Jose, CA · No drug or device payments recorded (2025) · (408) 972-7000
Dr. Alice Yang, M.D.
San Jose, CA · No drug or device payments recorded (2025) · Telehealth · (408) 523-3000
Dr. Allison Zhang, MD
San Jose, CA · $23 in drug and device payments (2025) · Telehealth · (650) 736-5555
Dr. Angela Hsu
San Jose, CA · $405 in drug and device payments (2025) · (408) 347-9001
Dr. Bailey V Vittal, MD
San Jose, CA · No drug or device payments recorded (2025) · (408) 926-2182
Dr. Bhargava Gannavarapu, M.D.
San Jose, CA · $4,679 in drug and device payments (2025) · (408) 471-2000
Dr. Brian Levitt, M.D.
San Jose, CA · $445 in drug and device payments (2025) · Telehealth · (408) 347-9001
Dr. Christopher Knauer, MD
San Jose, CA · No drug or device payments recorded (2025) · (408) 885-5000
Dr. Christopher Rombaoa, M.D.
San Jose, CA · $4,288 in drug and device payments (2025) · Telehealth · (619) 972-6910
Dr. David Chui, MD
San Jose, CA · No drug or device payments recorded (2025) · (408) 297-5740
Dr. David Lin, M.D.
San Jose, CA · No drug or device payments recorded (2025) · Telehealth · (084) 793-2550
Dr. David Stein, MD
San Jose, CA · No drug or device payments recorded (2025) · (408) 626-7375
Dr. Eduardo Da Silveira, MD, MSC
San Jose, CA · $699 in drug and device payments (2025) · Telehealth · (408) 347-9001
Dr. Eugenie Shieh
San Jose, CA · $526 in drug and device payments (2025) · Telehealth · (408) 347-9001
Dr. Geeta Kutty, M.D
San Jose, CA · $1,048 in drug and device payments (2025) · Telehealth · (408) 347-9001
Dr. Gene Ma, M.D.
San Jose, CA · No drug or device payments recorded (2025) · (408) 972-7000
Dr. Geoffrey Spencer, MD
San Jose, CA · No drug or device payments recorded (2025) · Telehealth · (408) 626-7375
Dr. Gordon Thenemann, MD
San Jose, CA · No drug or device payments recorded (2025) · (408) 972-7000
Dr. Gurpreet Rihal, MD
San Jose, CA · $105 in drug and device payments (2025) · (408) 972-7000
Dr. Harsha Vittal, MD
San Jose, CA · $235 in drug and device payments (2025) · Telehealth · (408) 926-2182
Dr. Hoan Tran, M.D.
San Jose, CA · $454 in drug and device payments (2025) · Telehealth · (408) 898-1168
Dr. Hugh Mai, M.D.
San Jose, CA · No drug or device payments recorded (2025) · (408) 993-0636
Dr. Huy Nguyen, M.D.
San Jose, CA · $6,768 in drug and device payments (2025) · (408) 347-9001
Dr. Huy Trinh, M.D.
San Jose, CA · $13,642 in drug and device payments (2025) · (408) 430-1688
Dr. Jason Williams, MD
San Jose, CA · No drug or device payments recorded (2025) · Telehealth · (408) 885-7947
Dr. Jenny Yang, MD
San Jose, CA · $410 in drug and device payments (2025) · (408) 347-9001
Dr. Khanh Nguyen, M.D.
San Jose, CA · $467 in drug and device payments (2025) · (408) 347-9001
Dr. Luis Ocampo, M.D.
San Jose, CA · No drug or device payments recorded (2025) · (941) 350-3525
Dr. Marwan Balaa, MD
San Jose, CA · No drug or device payments recorded (2025) · (408) 402-9990
Dr. Michael Fogel, MD
San Jose, CA · No drug or device payments recorded (2025) · (408) 885-7947
Dr. Michael Kushlan, M.D.
San Jose, CA · No drug or device payments recorded (2025) · (408) 356-0468
Dr. Morgan Wong, D.O.
San Jose, CA · $1,984 in drug and device payments (2025) · Telehealth · (408) 515-2428
Dr. Nimeesh Shah, MD
San Jose, CA · No drug or device payments recorded (2025) · Telehealth · (408) 885-7947
Dr. Omar Bakr, MD, MPH
San Jose, CA · No drug or device payments recorded (2025) · (408) 972-7000
Dr. Ranjit Makar, MD
San Jose, CA · No drug or device payments recorded (2025) · (408) 972-7729
Dr. Rasik Kansara, M.D.
San Jose, CA · No drug or device payments recorded (2025) · (408) 871-3400
Dr. Raymond Tu, MD
San Jose, CA · No drug or device payments recorded (2025) · (408) 972-7000
Dr. Richard Kramer, MD
San Jose, CA · No drug or device payments recorded (2025) · (408) 885-7947
Dr. Ruel Garcia, M.D.
San Jose, CA · $2,724 in drug and device payments (2025) · Telehealth · (408) 347-9001
Dr. Sally Nacianceno, M.D.
San Jose, CA · No drug or device payments recorded (2025) · (408) 251-3364
Dr. Sheila Savur, M.D.
San Jose, CA · $43 in drug and device payments (2025) · Telehealth · (408) 871-3400
Dr. Suejin Kim, MD
San Jose, CA · $61,633 in drug and device payments (2025) · Telehealth · (650) 736-5555
Dr. Terry Lin, D.O
San Jose, CA · No drug or device payments recorded (2025) · (408) 358-6580
Dr. Wendy Zhou, DO
San Jose, CA · $74 in drug and device payments (2025) · (408) 885-5000

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

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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.