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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. Tanya Thomas, M.D.
Mission Hills, CA · $1,334 in drug and device payments (2025) · Telehealth · (818) 869-7268
Dr. Touraj Zolfaghari, M.D.
Mission Hills, CA · $469 in drug and device payments (2025) · (818) 365-9531
Dr. Yvette David, M.D.
Mission Hills, CA · $82,800 in drug and device payments (2025) · Telehealth · (818) 838-4500
Dr. Ahmad Shaban, MD
Mission Viejo, CA · $252 in drug and device payments (2025) · (949) 364-2611
Dr. Asghar Oliai, M.D.
Mission Viejo, CA · No drug or device payments recorded (2025) · (949) 388-8011
Dr. Daniald Rodrigues, M.D.
Mission Viejo, CA · $3,111 in drug and device payments (2025) · Telehealth · (949) 364-5090
Dr. Daniel Kim, MD
Mission Viejo, CA · $2,991 in drug and device payments (2025) · Telehealth · (949) 364-5090
Dr. Douglas Nguyen, MD
Mission Viejo, CA · $406,320 in drug and device payments (2025) · Telehealth · (949) 364-5090
Dr. Edward Block, M.D.
Mission Viejo, CA · $4,154 in drug and device payments (2025) · Telehealth · (949) 364-5090
Dr. Elmer Chang, M.D.
Mission Viejo, CA · $4,414 in drug and device payments (2025) · Telehealth · (949) 364-5090
Dr. Habib Rahman, M.D.
Mission Viejo, CA · $368 in drug and device payments (2025) · (949) 276-2882
Dr. Jack Feng, M.D.
Mission Viejo, CA · $3,991 in drug and device payments (2025) · Telehealth · (949) 364-5090
Dr. Jae Lee, M.D.
Mission Viejo, CA · No drug or device payments recorded (2025) · (949) 364-6000
Dr. Michael Santoro, M.D.
Mission Viejo, CA · $3,179 in drug and device payments (2025) · Telehealth · (949) 364-5090
Dr. Nader Mirhoseni, M.D.
Mission Viejo, CA · $961 in drug and device payments (2025) · Telehealth · (949) 348-2900
Dr. Om Chaurasia, MD
Mission Viejo, CA · $959 in drug and device payments (2025) · Telehealth · (949) 365-8836
Dr. Poneh Rahimi, MD
Mission Viejo, CA · $37 in drug and device payments (2025) · (949) 364-2536
Dr. Ramin Zabihi, MD
Mission Viejo, CA · $1,252 in drug and device payments (2025) · Telehealth · (949) 218-4488
Dr. Ronald Adamany, M.D.
Mission Viejo, CA · $591 in drug and device payments (2025) · (949) 364-5090
Dr. Shahram Javaheri, M.D.
Mission Viejo, CA · $750 in drug and device payments (2025) · Telehealth · (949) 389-0660
Dr. Wanjun Bae, M.D.
Mission Viejo, CA · $4,448 in drug and device payments (2025) · Telehealth · (949) 364-5090
Dr. Alfred Gaymon, M.D.
Modesto, CA · No drug or device payments recorded (2025) · (973) 699-2160
Dr. Ambrish Ghumman, M.D.
Modesto, CA · $48 in drug and device payments (2025) · Telehealth · (209) 524-1211
Dr. Calvin Olson, MD
Modesto, CA · No drug or device payments recorded (2025) · (209) 550-4750
Dr. Felix Tam, M.D.
Modesto, CA · No drug or device payments recorded (2025) · (209) 735-5000
Dr. Gaspar Nazareno, M.D.
Modesto, CA · $497 in drug and device payments (2025) · Telehealth · (209) 550-4750
Dr. Jamie Byun, MD
Modesto, CA · $240 in drug and device payments (2025) · Telehealth · (209) 550-4788
Dr. Joshua Anderson, M.D.
Modesto, CA · $143 in drug and device payments (2025) · (209) 735-7200
Dr. Keith Leibowitz, MD
Modesto, CA · No drug or device payments recorded (2025) · (209) 522-6100
Dr. Michael Ringer, MD
Modesto, CA · $106 in drug and device payments (2025) · (209) 577-3388
Dr. Muhammad Shafqet, M.D.
Modesto, CA · $2,563 in drug and device payments (2025) · Telehealth · (209) 550-4725
Dr. Navim Mobin, MD
Modesto, CA · $207 in drug and device payments (2025) · Telehealth · (209) 550-4740
Dr. Pardeep Brar, MD,
Modesto, CA · $197 in drug and device payments (2025) · (209) 624-8780
Dr. Raman Khehra, MD
Modesto, CA · No drug or device payments recorded (2025) · Telehealth · (209) 524-1211
Dr. Richard Fisher, MD
Modesto, CA · No drug or device payments recorded (2025) · (209) 550-4570
Dr. Richard Plotzker, MD
Modesto, CA · No drug or device payments recorded (2025) · (209) 577-3388
Dr. Safwat Absood, M.D.
Modesto, CA · No drug or device payments recorded (2025) · (209) 576-1621
Dr. Tanya Dam, DO
Modesto, CA · $148 in drug and device payments (2025) · (209) 577-3388
Dr. Victorio Pidlaoan, MD
Modesto, CA · $632 in drug and device payments (2025) · Telehealth · (209) 524-1211
Dr. Vida Chen
Modesto, CA · $20 in drug and device payments (2025) · Telehealth · (209) 572-2736
Dr. Waleed Ibrahim, M.D.
Modesto, CA · $53 in drug and device payments (2025) · (209) 577-3388
Dr. William Griffiths, MD
Modesto, CA · No drug or device payments recorded (2025) · (209) 577-3388
Dr. Abdul Alaama, M.D.
Montebello, CA · No drug or device payments recorded (2025) · (323) 728-8009
Dr. Zelman Weingarten, MD
Montebello, CA · No drug or device payments recorded (2025) · (323) 490-7365
Dr. David Parsons, MD
Monterey, CA · $257 in drug and device payments (2025) · Telehealth · (831) 375-3577
Dr. Isabelle Moonan, M.D.
Monterey, CA · No drug or device payments recorded (2025) · (831) 375-3577
Dr. James Di Sario, M.D.
Monterey, CA · No drug or device payments recorded (2025) · (831) 375-3577
Dr. Jan Kamler, MD
Monterey, CA · $17,192 in drug and device payments (2025) · Telehealth · (831) 375-3577
Dr. Jeffrey Fiorenza, M.D.
Monterey, CA · $407 in drug and device payments (2025) · Telehealth · (831) 375-3577
Dr. Kathryn Swanson, M.D.
Monterey, CA · $230 in drug and device payments (2025) · (831) 375-3577

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.