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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. Sonya Dasharathy
Torrance, CA · $177 in drug and device payments (2025) · Telehealth · (310) 530-8013
Dr. Steven Weinstock, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 214-7236
Dr. Susanna Chan, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 539-2055
Dr. Thai Ha, MD
Torrance, CA · $709 in drug and device payments (2025) · Telehealth · (310) 375-1246
Dr. Timothy Tran, MD
Torrance, CA · $693 in drug and device payments (2025) · Telehealth · (310) 375-1246
Dr. Tonny Lee, M.D.
Torrance, CA · $18,570 in drug and device payments (2025) · Telehealth · (310) 539-2055
Dr. Viktor Eysselein, M.D.
Torrance, CA · $506 in drug and device payments (2025) · (310) 222-5101
Dr. Wael El-nachef, M.D.
Torrance, CA · $203 in drug and device payments (2025) · Telehealth · (310) 222-2409
Dr. Mahesh Modi, MD
Tracy, CA · No drug or device payments recorded (2025) · (209) 833-6118
Dr. Douglas Taylor, D.O.
Travis Afb, CA · $1,960 in drug and device payments (2025) · Telehealth · (210) 313-1759
Dr. Suk Whang, M.D.
Travis Afb, CA · $984 in drug and device payments (2025) · Telehealth · (707) 423-3040
Dr. Zachary Eagle, MD
Travis Afb, CA · $268 in drug and device payments (2025) · (707) 423-5041
Dr. A. Brooks, MD
Truckee, CA · No drug or device payments recorded (2025) · (775) 328-1747
Dr. Gurpreet Singh, MD
Truckee, CA · $154 in drug and device payments (2025) · (530) 587-7698
Dr. Eshagh Faraji, MD
Turlock, CA · $12,589 in drug and device payments (2025) · (209) 667-0543
Dr. Gurpreet Singh, MD
Turlock, CA · $18 in drug and device payments (2025) · (209) 656-6800
Dr. Jeffrey Mark, M.D.
Turlock, CA · $299 in drug and device payments (2025) · (209) 669-5000
Dr. Juan Canale, M.D.
Turlock, CA · $20 in drug and device payments (2025) · Telehealth · (209) 669-6060
Dr. Khaldoun Debian, M.D.
Tustin, CA · $1,187 in drug and device payments (2025) · (714) 937-9400
Dr. Mohammad Elbatta
Tustin, CA · $54 in drug and device payments (2025) · (714) 937-9400
Dr. Moothedath Menon, M.D.
Tustin, CA · $18 in drug and device payments (2025) · (714) 665-9890
Dr. Won Yu, M.D.
Tustin, CA · $1,421 in drug and device payments (2025) · Telehealth · (714) 937-9400
Dr. Brian Hanson, M.D.
Ukiah, CA · $259 in drug and device payments (2025) · Telehealth · (707) 462-1823
Dr. Brian Hauck, MD
Ukiah, CA · No drug or device payments recorded (2025) · (707) 463-7356
Dr. Craig Aronchick, MD
Ukiah, CA · No drug or device payments recorded (2025) · (707) 463-7356
Dr. Basim Abdelkarim, MD
Upland, CA · $921 in drug and device payments (2025) · Telehealth · (909) 920-0444
Dr. Camron Kiafar, D.O.
Upland, CA · No drug or device payments recorded (2025) · (909) 920-0444
Dr. Chuang Hung, M.D.
Upland, CA · $537 in drug and device payments (2025) · (909) 985-2709
Dr. Dwaraknath Reddy, M.D.
Upland, CA · No drug or device payments recorded (2025) · (909) 629-5540
Dr. John Kim, M.D.
Upland, CA · $157 in drug and device payments (2025) · (909) 981-8905
Dr. Kevin Jenkins, DO
Upland, CA · $23 in drug and device payments (2025) · (909) 985-2874
Dr. Mysore Nagaraja, M.D.
Upland, CA · No drug or device payments recorded (2025) · (909) 982-2279
Dr. Nischita Merla, MD, MPH
Upland, CA · $1,694 in drug and device payments (2025) · (909) 833-7556
Dr. Priyanka Yaramada
Upland, CA · $446 in drug and device payments (2025) · Telehealth · (909) 920-0444
Dr. Lanchinh Nguyen, MD
Vacaville, CA · No drug or device payments recorded (2025) · Telehealth · (707) 453-5000
Dr. Anna Skay
Valencia, CA · $20 in drug and device payments (2025) · Telehealth · (661) 255-2420
Dr. Chanthel Kokoy-mondragon, M.D.
Valencia, CA · No drug or device payments recorded (2025) · Telehealth · (661) 255-2420
Dr. David Krieger, M.D.,PH.D.
Valencia, CA · No drug or device payments recorded (2025) · (661) 255-2420
Dr. Laura Mcenerney, M.D.
Valencia, CA · No drug or device payments recorded (2025) · Telehealth · (661) 255-2420
Dr. Nirali Sheth, DO
Valencia, CA · $95 in drug and device payments (2025) · Telehealth · (661) 255-2420
Dr. Samik Shah
Valencia, CA · No drug or device payments recorded (2025) · Telehealth · (661) 255-2420
Dr. Sittiporn Bencharit, M.D.
Valencia, CA · No drug or device payments recorded (2025) · (661) 255-2420
Dr. Aaron Levy, MD
Vallejo, CA · $588 in drug and device payments (2025) · (707) 651-1000
Dr. Arun Suryaprasad, MD
Vallejo, CA · No drug or device payments recorded (2025) · Telehealth · (707) 651-1000
Dr. Jeffrey Wei, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Laurence Mazzotta, M.D.
Vallejo, CA · No drug or device payments recorded (2025) · (707) 648-3327
Dr. Marcus Juan Esteban, M.D.
Vallejo, CA · $501 in drug and device payments (2025) · (707) 651-1000
Dr. Pauline Mysliwiec, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Ralston Martin, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Ryan Nock, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000

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.