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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. Elijah Verheyen
Corte Madera, CA · $1,133 in drug and device payments (2025) · Telehealth · (415) 925-6900
Dr. Jennifer Frankel, M.D.
Corte Madera, CA · $249 in drug and device payments (2025) · Telehealth · (415) 925-6900
Dr. Wendy Davis, M.D.
Corte Madera, CA · $68 in drug and device payments (2025) · (415) 925-6900
Dr. Ashkan Farhadi, M.D.
Costa Mesa, CA · $62 in drug and device payments (2025) · (714) 966-9523
Dr. Khoi Tran, MD
Costa Mesa, CA · $120 in drug and device payments (2025) · (949) 386-5260
Dr. Mannat Saini, MD
Costa Mesa, CA · $220 in drug and device payments (2025) · Telehealth · (949) 398-1440
Dr. Michael Oliver, MD
Covina, CA · No drug or device payments recorded (2025) · (626) 331-6411
Dr. Shahnawaz Jaffer, M.D.
Covina, CA · $139 in drug and device payments (2025) · Telehealth · (626) 915-7100
Dr. Syed Mohsin Saghir
Covina, CA · $1,165 in drug and device payments (2025) · (626) 960-2326
Dr. Yi-chia Wu, M.D.
Covina, CA · $1,871 in drug and device payments (2025) · (626) 960-2326
Dr. Lourdes Bahamonde, DO
Cudahy, CA · No drug or device payments recorded (2025) · Telehealth · (213) 373-1265
Dr. Paul Key, MD
Culver City, CA · No drug or device payments recorded (2025) · (310) 836-7414
Dr. Robert Gross, MD
Culver City, CA · No drug or device payments recorded (2025) · (310) 204-4044
Dr. Peter Winkle, MD
Cypress, CA · No drug or device payments recorded (2025) · (714) 897-1071
Dr. John Fisher, M.D.
Daly City, CA · No drug or device payments recorded (2025) · (650) 756-5000
Dr. Mark Tsuchiyose, M.D.
Daly City, CA · $2,048 in drug and device payments (2025) · Telehealth · (650) 756-5000
Dr. Rowena Garcia Chuapoco, MD
Daly City, CA · $2,455 in drug and device payments (2025) · Telehealth · (650) 756-5000
Dr. Stefan Chin, MD
Daly City, CA · $1,944 in drug and device payments (2025) · Telehealth · (650) 756-5000
Dr. Salim Shelby, M.D.
Danville, CA · $2,383 in drug and device payments (2025) · Telehealth · (925) 232-0090
Dr. Eric Chak, M.D.
Davis, CA · $352 in drug and device payments (2025) · Telehealth · (530) 747-0389
Dr. Ian Logan, M.D.
Davis, CA · $41 in drug and device payments (2025) · Telehealth · (530) 747-0389
Dr. Robert Silva, MD
Davis, CA · $30 in drug and device payments (2025) · (530) 747-0389
Dr. Spencer Frost, MD
Davis, CA · $475 in drug and device payments (2025) · Telehealth · (530) 747-0389
Dr. Sung Yoo, MD
Diamond Bar, CA · $22 in drug and device payments (2025) · (626) 913-1116
Dr. Andrew Nguyen, MD
Downey, CA · $467 in drug and device payments (2025) · (714) 902-5641
Dr. Ann Lee, M.D.
Downey, CA · $58 in drug and device payments (2025) · (562) 869-4497
Dr. Gareth Dulai, MD
Downey, CA · No drug or device payments recorded (2025) · (562) 657-4292
Dr. Gaurang Chaurushia, MD
Downey, CA · No drug or device payments recorded (2025) · (562) 862-3656
Dr. Kevin Dholaria, M.D.
Downey, CA · $905 in drug and device payments (2025) · (562) 904-4445
Dr. Michelle Vu, M.D.
Downey, CA · $46 in drug and device payments (2025) · (562) 657-4292
Dr. Paul Frenkiel, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 861-0954
Dr. Rajeev Attam, MD
Downey, CA · $265 in drug and device payments (2025) · (562) 657-4292
Dr. Steven Weiss, MD
Downey, CA · No drug or device payments recorded (2025) · (562) 861-0897
Dr. Sushil Ojha, MD
Downey, CA · $441 in drug and device payments (2025) · (562) 862-3656
Dr. Terence Chiu, MD
Downey, CA · No drug or device payments recorded (2025) · (562) 657-4292
Dr. Aileen Bui, MD
Duarte, CA · $41,945 in drug and device payments (2025) · Telehealth · (800) 826-4673
Dr. Anahita Rezaie, MD
Duarte, CA · No drug or device payments recorded (2025) · (626) 256-4673
Dr. Aung Kaung, M.D
Duarte, CA · No drug or device payments recorded (2025) · Telehealth · (800) 826-4673
Dr. Donald David, MD
Duarte, CA · No drug or device payments recorded (2025) · (626) 256-4673
Dr. Dupinder Singh, M.D.
Duarte, CA · $133 in drug and device payments (2025) · Telehealth · (626) 256-4673
Dr. Evan Mosier, M.D.
Duarte, CA · $20 in drug and device payments (2025) · Telehealth · (800) 826-4673
Dr. Gregory Idos, M.D.
Duarte, CA · $234 in drug and device payments (2025) · Telehealth · (626) 256-4673
Dr. James Lin, MD
Duarte, CA · $188 in drug and device payments (2025) · Telehealth · (626) 256-4673
Dr. Jeremiah Donovan, MD
Duarte, CA · $19 in drug and device payments (2025) · (626) 256-4673
Dr. Trilokesh Kidambi, MD
Duarte, CA · $29 in drug and device payments (2025) · Telehealth · (626) 256-4673
Dr. Victoria Green, MD
Duarte, CA · $109 in drug and device payments (2025) · (800) 826-4673
Dr. Mrudula Kumar, MD
Dublin, CA · $105 in drug and device payments (2025) · Telehealth · (925) 443-8040
Dr. Philip Pailey, MD
El Cajon, CA · No drug or device payments recorded (2025) · (619) 579-0460
Dr. Hussein El-newihi, MD
El Centro, CA · $1,227 in drug and device payments (2025) · (760) 353-5000
Dr. Mahomed Suliman, MD
El Centro, CA · $1,256 in drug and device payments (2025) · (760) 337-1000

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.