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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. Irene Sonu, MD
Palo Alto, CA · $5,157 in drug and device payments (2025) · Telehealth · (650) 723-4000
Dr. Jennifer Pan, M.D.
Palo Alto, CA · $19,342 in drug and device payments (2025) · (650) 493-5000
Dr. Joanne Imperial, MD
Palo Alto, CA · $17,774 in drug and device payments (2025) · (650) 324-7912
Dr. John Clarke, M.D.
Palo Alto, CA · $130 in drug and device payments (2025) · Telehealth · (650) 723-4000
Dr. Matthew Chang, M.D.
Palo Alto, CA · $34 in drug and device payments (2025) · (650) 736-5555
Dr. Mythili Pathipati, MD
Palo Alto, CA · $420 in drug and device payments (2025) · Telehealth · (650) 853-2972
Dr. Nielsen Fernandez-becker, M.D., PH.D.
Palo Alto, CA · $72 in drug and device payments (2025) · Telehealth · (650) 723-4000
Dr. Patricia Garcia, M.D.
Palo Alto, CA · $29 in drug and device payments (2025) · Telehealth · (650) 724-3240
Dr. Paul Rubinstein, M.D.
Palo Alto, CA · No drug or device payments recorded (2025) · (650) 321-4121
Dr. Peter Gregory, M.D
Palo Alto, CA · No drug or device payments recorded (2025) · (650) 725-9924
Dr. Ramsey Cheung, MD
Palo Alto, CA · No drug or device payments recorded (2025) · (650) 493-5000
Dr. Richard Babb, M.D.
Palo Alto, CA · No drug or device payments recorded (2025) · (650) 321-4121
Dr. Robert Ruskin, MD
Palo Alto, CA · No drug or device payments recorded (2025) · (650) 326-8527
Dr. Ryan Mcconnell, MD
Palo Alto, CA · $71,075 in drug and device payments (2025) · Telehealth · (650) 853-2972
Dr. Samer Eldika, M.D.
Palo Alto, CA · $1,176 in drug and device payments (2025) · Telehealth · (650) 723-4000
Dr. Sundeep Singh, M.D.
Palo Alto, CA · $43,714 in drug and device payments (2025) · Telehealth · (650) 723-4000
Dr. Susie Liu, MD
Palo Alto, CA · $122 in drug and device payments (2025) · Telehealth · (650) 324-8878
Dr. Suzanne Matsui, M.D.
Palo Alto, CA · No drug or device payments recorded (2025) · (650) 493-5000
Dr. Toru Nakata, MD, PHD
Palo Alto, CA · $26 in drug and device payments (2025) · (650) 723-5948
Dr. Yasser Bhat, M.D.
Palo Alto, CA · $587 in drug and device payments (2025) · Telehealth · (650) 853-2972
Dr. Anuradha Pappu, MD
Panorama City, CA · No drug or device payments recorded (2025) · (818) 375-2000
Dr. Arthur Mehlman, MD
Panorama City, CA · No drug or device payments recorded (2025) · (818) 375-2000
Dr. Bruce Zweiban, MD
Panorama City, CA · $229 in drug and device payments (2025) · (818) 375-2000
Dr. Fredric Schlussel, MD
Panorama City, CA · No drug or device payments recorded (2025) · Telehealth · (818) 375-2000
Dr. Gina Lin, MD
Panorama City, CA · No drug or device payments recorded (2025) · (818) 375-2000
Dr. Jung Park, MD
Panorama City, CA · No drug or device payments recorded (2025) · (818) 375-2000
Dr. Shant Hamamah, MD
Panorama City, CA · No drug or device payments recorded (2025) · (818) 375-2000
Dr. Damian Pestana, M.D.
Paradise, CA · $233 in drug and device payments (2025) · (530) 877-0400
Dr. Donald Mansell, M.D.
Paradise, CA · $397 in drug and device payments (2025) · Telehealth · (530) 877-0400
Dr. Joseph Tan, M.D.
Paramount, CA · $33 in drug and device payments (2025) · (562) 404-0503
Dr. Arlan Cohen, M.D.
Pasadena, CA · No drug or device payments recorded (2025) · (626) 449-9209
Dr. Daniel Golpanian, M.D.
Pasadena, CA · $1,272 in drug and device payments (2025) · (626) 793-7114
Dr. Glenn Littenberg, M.D.
Pasadena, CA · $13,373 in drug and device payments (2025) · (626) 449-9920
Dr. Ihab Beblawi, M.D.
Pasadena, CA · $1,337 in drug and device payments (2025) · Telehealth · (626) 796-7114
Dr. John Zeroogian, M.D.
Pasadena, CA · $974 in drug and device payments (2025) · Telehealth · (626) 449-9920
Dr. Julie Yang, M.D.
Pasadena, CA · $1,283 in drug and device payments (2025) · Telehealth · (626) 793-7114
Dr. Kalman Edelman, M.D.
Pasadena, CA · $271 in drug and device payments (2025) · (626) 793-7114
Dr. Matthew Mukherjee, M.D.
Pasadena, CA · $2,023 in drug and device payments (2025) · Telehealth · (626) 793-7114
Dr. Peter Rosenberg, M.D.
Pasadena, CA · $2,044 in drug and device payments (2025) · Telehealth · (626) 793-7114
Dr. Richard Nickowitz, MD
Pasadena, CA · $1,614 in drug and device payments (2025) · Telehealth · (626) 793-7114
Dr. Sassan Soltani, M.D.
Pasadena, CA · $1,927 in drug and device payments (2025) · Telehealth · (626) 793-7114
Dr. Sergio Stubrin, MD
Pasadena, CA · No drug or device payments recorded (2025) · (626) 793-7114
Dr. Steven Petit, MD AMC
Pasadena, CA · $24 in drug and device payments (2025) · (626) 449-9920
Dr. Waleed Shindy, M.D.
Pasadena, CA · $2,198 in drug and device payments (2025) · Telehealth · (626) 449-9920
Dr. Stephen Denigris, MD
Petaluma, CA · No drug or device payments recorded (2025) · (707) 766-9852
Dr. Timothy Sowerby, MD
Petaluma, CA · No drug or device payments recorded (2025) · (707) 765-3900
Dr. Keith Fiman, M.D.
Piedmont, CA · $30 in drug and device payments (2025) · (713) 305-1074
Dr. Victor Wang, MD
Placentia, CA · $42 in drug and device payments (2025) · (714) 996-3700
Dr. Daniel Cummings, M.D.
Placerville, CA · $256 in drug and device payments (2025) · (530) 344-2060
Dr. Eric Rowen, M.D.
Pleasanton, CA · No drug or device payments recorded (2025) · (925) 460-8167

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.