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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. Adrianne Lajoie, M.D.
Encinitas, CA · $1,458 in drug and device payments (2025) · Telehealth · (760) 783-0441
Dr. Ali Fakhreddine, M.D.
Encinitas, CA · $269 in drug and device payments (2025) · Telehealth · (760) 633-7280
Dr. Gordon Kim, M.D.
Encinitas, CA · No drug or device payments recorded (2025) · Telehealth · (760) 753-5594
Dr. Janki Patel, M.D.
Encinitas, CA · $2,164 in drug and device payments (2025) · Telehealth · (760) 783-0441
Dr. Jeanette Mendez, M.D.
Encinitas, CA · $117 in drug and device payments (2025) · (760) 633-6501
Dr. Mohammad Arbabi, MD
Encinitas, CA · No drug or device payments recorded (2025) · (760) 436-8881
Dr. Piyush Kumar, MD
Encinitas, CA · No drug or device payments recorded (2025) · (760) 436-8881
Dr. Robert Goldklang, M.D.
Encinitas, CA · $6,090 in drug and device payments (2025) · Telehealth · (760) 783-0441
Dr. Steven Dilauro, MD
Encinitas, CA · $2,955 in drug and device payments (2025) · Telehealth · (760) 783-0441
Dr. Ara Kardashian, M.D.
Encino, CA · $355 in drug and device payments (2025) · Telehealth · (818) 618-1484
Dr. Fredric Weiss, M.D.
Encino, CA · $16 in drug and device payments (2025) · (818) 501-4277
Dr. Kenneth Buch, MD
Encino, CA · $1,862 in drug and device payments (2025) · Telehealth · (818) 989-1917
Dr. Michael Shiffman, MD
Encino, CA · No drug or device payments recorded (2025) · (818) 989-1917
Dr. Haritha Chelimilla, M.D.
Escondido, CA · $566 in drug and device payments (2025) · Telehealth · (760) 294-7600
Dr. Mark Kadden, M.D.
Escondido, CA · No drug or device payments recorded (2025) · (760) 489-0908
Dr. Adriena Kajdos, M.D.
Eureka, CA · No drug or device payments recorded (2025) · (707) 443-9371
Dr. Kusum Stokes, M.D.
Eureka, CA · No drug or device payments recorded (2025) · Telehealth · (707) 443-4869
Dr. Frances Lee, DO
Fairfield, CA · $161 in drug and device payments (2025) · Telehealth · (707) 427-4900
Dr. Krishnaswamy Rajan, MD
Fairfield, CA · No drug or device payments recorded (2025) · (707) 399-8019
Dr. Lawrence Chan, M.D.
Fairfield, CA · No drug or device payments recorded (2025) · Telehealth · (707) 427-4900
Dr. Merle Sogge, M.D.
Fairfield, CA · No drug or device payments recorded (2025) · Telehealth · (707) 423-2506
Dr. Michael Krier, M.D.
Fairfield, CA · $1,691 in drug and device payments (2025) · Telehealth · (707) 423-4501
Dr. Mounzer Al Samman, M.D.
Fairfield, CA · $1,361 in drug and device payments (2025) · Telehealth · (707) 646-3555
Dr. Nazia Hasan, M.D., M.P.H.
Fairfield, CA · $2,140 in drug and device payments (2025) · (707) 646-3555
Dr. Rashid Iqbal, MD
Fairfield, CA · $288 in drug and device payments (2025) · Telehealth · (707) 399-9200
Dr. Richard Gould, M.D.
Fairfield, CA · No drug or device payments recorded (2025) · (707) 427-4900
Dr. John Hong, MD
Fallbrook, CA · $1,416 in drug and device payments (2025) · Telehealth · (760) 728-9560
Dr. Thomas Eastman, DO
Fallbrook, CA · No drug or device payments recorded (2025) · (760) 728-9560
Dr. Thomas Harpole, MD
Fallbrook, CA · No drug or device payments recorded (2025) · (760) 728-9560
Dr. Dhruv Patel, M.D.
Folsom, CA · $3,482 in drug and device payments (2025) · Telehealth · (916) 734-2737
Dr. Nazir Rahim, MD
Folsom, CA · $4,278 in drug and device payments (2025) · Telehealth · (916) 983-4444
Dr. Alexander Han, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-5000
Dr. Blanca Viramontes, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Daniel Seid, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. David Kestenbaum, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Eve Kirschner, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Nehali Patel, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-5000
Dr. Patricia Hsia, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Scott Marnoy, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Timothy Jenkins, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Timothy Mccarter, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-7830
Dr. Tommy Oei, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Babak Firoozi, M.D.
Fountain Valley, CA · $2,032 in drug and device payments (2025) · Telehealth · (657) 241-9090
Dr. David Truong, M.D.
Fountain Valley, CA · $463 in drug and device payments (2025) · (714) 274-9969
Dr. Davinder Singh, M.D.
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 540-9911
Dr. Duke Nguyen, MD
Fountain Valley, CA · $12,048 in drug and device payments (2025) · Telehealth · (714) 378-7390
Dr. Erick Argueta, MD
Fountain Valley, CA · $1,219 in drug and device payments (2025) · (657) 241-9090
Dr. Fernando Austin, MD
Fountain Valley, CA · $527 in drug and device payments (2025) · (714) 964-6229
Dr. Jose Luis Aranez, M.D.
Fountain Valley, CA · $895 in drug and device payments (2025) · Telehealth · (657) 241-9090
Dr. Ky-dieu Tran, MD
Fountain Valley, CA · $3,212 in drug and device payments (2025) · (714) 867-4457

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.