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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. Kumaravel Perumalsamy, M.D.
Lancaster, CA · $9,066 in drug and device payments (2025) · Telehealth · (661) 529-7550
Dr. Prithviraj Dharmaraja, M.D.
Lancaster, CA · $1,165 in drug and device payments (2025) · Telehealth · (661) 529-7550
Dr. Ramanbhai Patel, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · (661) 948-0803
Dr. Sethu Madhavan, MD
Lancaster, CA · No drug or device payments recorded (2025) · (661) 945-7181
Dr. Shelly Singh, D.O.
Lancaster, CA · No drug or device payments recorded (2025) · (661) 945-7853
Dr. Taha Hamoui, MD
Lancaster, CA · No drug or device payments recorded (2025) · (661) 949-5901
Dr. Vivaik Tyagi, M.D.
Lancaster, CA · $1,148 in drug and device payments (2025) · Telehealth · (661) 529-7550
Dr. William Go, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · Telehealth · (661) 726-2226
Dr. Norman Kuo, M.D.
La Palma, CA · No drug or device payments recorded (2025) · (714) 521-0239
Dr. Eugene Lam, MD
La Quinta, CA · No drug or device payments recorded (2025) · Telehealth · (760) 771-1000
Dr. Thomas Norum, M.D.
La Quinta, CA · No drug or device payments recorded (2025) · (310) 339-1508
Dr. Carl West, M.D.
Laquinta, CA · $268 in drug and device payments (2025) · (760) 673-7010
Dr. Christopher Entwisle, M.D.
Livermore, CA · $29 in drug and device payments (2025) · Telehealth · (925) 245-1238
Dr. Hemnishil Marella, DO
Livermore, CA · No drug or device payments recorded (2025) · Telehealth · (925) 454-6390
Dr. Kayvon Sotoudeh, M.D.
Livermore, CA · No drug or device payments recorded (2025) · Telehealth · (925) 373-4129
Dr. Ru Min Lee, M.D.
Livermore, CA · $3,582 in drug and device payments (2025) · (925) 454-6390
Dr. David Aarons, MD
Lodi, CA · No drug or device payments recorded (2025) · (209) 334-3153
Dr. Emmanuel Obanor, DO
Lodi, CA · $1,241 in drug and device payments (2025) · (209) 334-8514
Dr. Mazen Mardini, MD
Lodi, CA · $301 in drug and device payments (2025) · (209) 334-6325
Dr. Sital Singh, M.D.
Lodi, CA · $541 in drug and device payments (2025) · Telehealth · (209) 334-8514
Dr. Andrew Chang, M.D.
Loma Linda, CA · $161 in drug and device payments (2025) · Telehealth · (909) 558-2850
Dr. Andrew Wright, MD
Loma Linda, CA · $26 in drug and device payments (2025) · (909) 558-4905
Dr. Artin Galoosian, M.D., M.A.
Loma Linda, CA · $125 in drug and device payments (2025) · (909) 558-2850
Dr. Bing Zhang
Loma Linda, CA · $351 in drug and device payments (2025) · Telehealth · (909) 558-4905
Dr. Bruce Runyon, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-2191
Dr. Christian Jackson, M.D.
Loma Linda, CA · $715 in drug and device payments (2025) · (909) 825-7084
Dr. Chung-jyi Tsai, MD
Loma Linda, CA · No drug or device payments recorded (2025) · Telehealth · (909) 558-4905
Dr. Cindy Cai, M.D., PH.D.
Loma Linda, CA · $33 in drug and device payments (2025) · (909) 583-6100
Dr. Daniel Chao, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 825-7084
Dr. David Condon, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-2191
Dr. Erick Imbertson, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4000
Dr. Keisha Baldeosingh, MD
Loma Linda, CA · $936 in drug and device payments (2025) · (269) 426-6264
Dr. Kendrick Che, DO
Loma Linda, CA · $1,638 in drug and device payments (2025) · Telehealth · (909) 558-8131
Dr. Kenneth Kelln, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-2191
Dr. Khaled Selim, M.D.
Loma Linda, CA · $9,209 in drug and device payments (2025) · Telehealth · (909) 558-3636
Dr. Maham Farshidpour, MD
Loma Linda, CA · $259 in drug and device payments (2025) · (405) 595-6859
Dr. Mahnaz Farahmand, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4905
Dr. Matthew Oman, M.D.
Loma Linda, CA · $3,153 in drug and device payments (2025) · (909) 558-8242
Dr. Michael Walter, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-2191
Dr. Michel Mendler, M.D.
Loma Linda, CA · $94 in drug and device payments (2025) · (909) 558-2191
Dr. Mina Rakoski, M.D.
Loma Linda, CA · $80,209 in drug and device payments (2025) · Telehealth · (909) 558-3364
Dr. Mohammed Ali
Loma Linda, CA · $125 in drug and device payments (2025) · (909) 825-7084
Dr. Nikhil Thiruvengadam
Loma Linda, CA · $740 in drug and device payments (2025) · Telehealth · (909) 558-4499
Dr. Nour Parsa, M.D.
Loma Linda, CA · $29 in drug and device payments (2025) · (909) 558-4499
Dr. Rita Auro, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-5512
Dr. Ronald Griffin, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 583-6100
Dr. Roy Liu, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4905
Dr. Snorri Olafsson, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-2191
Dr. Terence Lewis, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-2191
Dr. Timothy Yen, M.D.
Loma Linda, CA · $26 in drug and device payments (2025) · Telehealth · (909) 558-4905

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.