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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. Jeffry Brown, M.D.
Templeton, CA · No drug or device payments recorded (2025) · Telehealth · (805) 434-5497
Dr. Jonathan Riegler, MD
Templeton, CA · No drug or device payments recorded (2025) · Telehealth · (805) 434-5497
Dr. Niraj Bhalani, DO
Templeton, CA · $441 in drug and device payments (2025) · Telehealth · (805) 434-5530
Dr. Trevor Houston, D.O.
Templeton, CA · No drug or device payments recorded (2025) · (805) 434-5530
Dr. Andrew Gregg, MD PHD
Thousand Oaks, CA · No drug or device payments recorded (2025) · Telehealth · (805) 370-0127
Dr. Bonaventure Eng, MD
Thousand Oaks, CA · No drug or device payments recorded (2025) · (805) 497-0961
Dr. Cristina Wiese, MD
Thousand Oaks, CA · $20 in drug and device payments (2025) · (805) 557-0452
Dr. Gilbert Simoni, M.D., FACG
Thousand Oaks, CA · $12,301 in drug and device payments (2025) · Telehealth · (805) 719-0244
Dr. Gregory Johnson, MD
Thousand Oaks, CA · No drug or device payments recorded (2025) · (805) 497-9597
Dr. Kumar Desai, M.D.
Thousand Oaks, CA · $523 in drug and device payments (2025) · Telehealth · (805) 449-4278
Dr. Michael Albertson, M.D.
Thousand Oaks, CA · No drug or device payments recorded (2025) · (805) 418-3500
Dr. Paul Sanders, MD
Thousand Oaks, CA · No drug or device payments recorded (2025) · (805) 495-7439
Dr. Shahram Daneshgar, MD
Thousand Oaks, CA · $1,351 in drug and device payments (2025) · (805) 371-8400
Dr. Steven Kind, MD
Thousand Oaks, CA · $299 in drug and device payments (2025) · (805) 418-3500
Dr. Alexander Nguyen, MD
Torrance, CA · $2,142 in drug and device payments (2025) · (310) 530-8013
Dr. Anil Dev, M.D.
Torrance, CA · $509 in drug and device payments (2025) · (310) 222-2475
Dr. Azam Riyaz, MD
Torrance, CA · $334 in drug and device payments (2025) · Telehealth · (310) 375-1246
Dr. Bao Sean Nguyen, MD
Torrance, CA · $271 in drug and device payments (2025) · Telehealth · (310) 530-8013
Dr. Cameron Sikavi, MD
Torrance, CA · $1,788 in drug and device payments (2025) · Telehealth · (310) 534-8200
Dr. Chirag Patel, MD
Torrance, CA · $1,448 in drug and device payments (2025) · Telehealth · (310) 375-1246
Dr. Chun Hsu, MD
Torrance, CA · $310 in drug and device payments (2025) · Telehealth · (310) 375-1246
Dr. Daniel Cho, M.D.
Torrance, CA · $1,945 in drug and device payments (2025) · Telehealth · (310) 539-2055
Dr. Daniel Shue, MD
Torrance, CA · $760 in drug and device payments (2025) · Telehealth · (310) 375-1246
Dr. David Chung, MD
Torrance, CA · $1,498 in drug and device payments (2025) · Telehealth · (310) 375-1246
Dr. Didi Mwengela, M.D.
Torrance, CA · No drug or device payments recorded (2025) · Telehealth · (310) 530-8013
Dr. Edward Piken, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 539-2055
Dr. Ellie Chen, MD
Torrance, CA · $377 in drug and device payments (2025) · Telehealth · (310) 530-8013
Dr. Gloria Sze, M.D.
Torrance, CA · $717 in drug and device payments (2025) · Telehealth · (310) 539-2055
Dr. Henry Lam, DO
Torrance, CA · $933 in drug and device payments (2025) · (424) 306-4000
Dr. Howard Resin, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 539-2055
Dr. James Sattler, MD
Torrance, CA · $1,511 in drug and device payments (2025) · Telehealth · (310) 375-1246
Dr. Jennifer Kolb, MD
Torrance, CA · $6,774 in drug and device payments (2025) · Telehealth · (310) 530-8013
Dr. Jerome Cohen, M.D.
Torrance, CA · $1,847 in drug and device payments (2025) · Telehealth · (310) 539-2055
Dr. Judy Law-torok, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 698-6344
Dr. Karl Fukunaga, MD
Torrance, CA · $868 in drug and device payments (2025) · Telehealth · (310) 375-1246
Dr. Kelsey Collins, MD
Torrance, CA · No drug or device payments recorded (2025) · (310) 214-7236
Dr. Kenneth Holt, MD
Torrance, CA · $23 in drug and device payments (2025) · Telehealth · (310) 375-1246
Dr. Linda Hou, MD
Torrance, CA · $124 in drug and device payments (2025) · (310) 222-2477
Dr. Mark Takemura, MD
Torrance, CA · No drug or device payments recorded (2025) · (310) 214-7236
Dr. Masaharu Osato, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 534-8200
Dr. Melissa Munsell, M.D.
Torrance, CA · $945 in drug and device payments (2025) · Telehealth · (310) 530-8013
Dr. Michael Bernstein, MD
Torrance, CA · $902 in drug and device payments (2025) · Telehealth · (310) 375-1246
Dr. Minh Nguyen, M.D.
Torrance, CA · $1,935 in drug and device payments (2025) · Telehealth · (310) 539-2055
Dr. Nazir Khaja, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 370-4660
Dr. Nimah Ather
Torrance, CA · No drug or device payments recorded (2025) · Telehealth · (310) 530-8013
Dr. Norman Panitch, MD
Torrance, CA · No drug or device payments recorded (2025) · (310) 539-2055
Dr. Oren Zaidel, M.D.
Torrance, CA · $1,000 in drug and device payments (2025) · Telehealth · (310) 539-2055
Dr. Robert Webman, M.D
Torrance, CA · $302 in drug and device payments (2025) · (310) 542-5800
Dr. Sara Kranke
Torrance, CA · $42,044 in drug and device payments (2025) · (310) 570-9618
Dr. Shahina Hakim, MD
Torrance, CA · $258 in drug and device payments (2025) · Telehealth · (310) 375-1246

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.