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 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. Arnold Flick, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(858) 581-9031 Dr. Arvin Jeremy Tan, MDLa Jolla, CA · No drug or device payments recorded (2025) ·
(858) 554-3200 Dr. Bahar Madani, MDLa Jolla, CA · $934 in drug and device payments (2025) · Telehealth ·
(858) 554-4310 Dr. Catherine Frenette, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(858) 554-4310 Dr. Claudia Dziegielewski, MDLa Jolla, CA · $753 in drug and device payments (2025) ·
(858) 657-7000 Dr. Douglas Hunt, M.D.La Jolla, CA · $850 in drug and device payments (2025) · Telehealth ·
(858) 824-5000 Dr. Edward Paredez, M.D.La Jolla, CA · $33 in drug and device payments (2025) · Telehealth ·
(858) 453-5200 Dr. Franklin Tsai, M.D.La Jolla, CA · $1,503 in drug and device payments (2025) · Telehealth ·
(858) 554-8069 Dr. Frank Mayer, M.D.La Jolla, CA · No drug or device payments recorded (2025) · Telehealth ·
(858) 457-3737 Dr. Gauree Konijeti, MD, MPHLa Jolla, CA · $18,211 in drug and device payments (2025) · Telehealth ·
(858) 554-8879 Dr. Jill Lane, MDLa Jolla, CA · $1,736 in drug and device payments (2025) · Telehealth ·
(858) 554-8879 Dr. John Carethers, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(800) 926-8273 Dr. John Kuldau, M.D.La Jolla, CA · $2,371 in drug and device payments (2025) · Telehealth ·
(858) 554-8880 Dr. Joy-marie Hermes, MDLa Jolla, CA · $1,875 in drug and device payments (2025) · Telehealth ·
(858) 554-8879 Dr. Laurel Branch, MDLa Jolla, CA · $1,832 in drug and device payments (2025) · Telehealth ·
(800) 926-8273 Dr. Mary Krinsky, D.O.La Jolla, CA · $21,890 in drug and device payments (2025) · Telehealth ·
(619) 543-2347 Dr. Matthew Skinner, M.D.La Jolla, CA · $21,338 in drug and device payments (2025) · Telehealth ·
(858) 824-4151 Dr. Nabil Noureddin, M.D.La Jolla, CA · $16,123 in drug and device payments (2025) ·
(800) 926-8273 Dr. Olivia Lanser, MDLa Jolla, CA · $1,436 in drug and device payments (2025) ·
(858) 554-3200 Dr. Otto Nebel, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(858) 453-5200 Dr. Parviz Foroozan, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(858) 554-8880 Dr. Paul Pockros, M.D.La Jolla, CA · $106,629 in drug and device payments (2025) · Telehealth ·
(858) 554-8880 Dr. Phillip Cohen-lyons, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(747) 220-7411 Dr. Pradipta Ghosh, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(858) 534-2766 Dr. Preetika Sinh, M.D.La Jolla, CA · $117 in drug and device payments (2025) · Telehealth ·
(800) 926-8273 Dr. Quan Nhu, M.D., PH.D.La Jolla, CA · $142,085 in drug and device payments (2025) · Telehealth ·
(858) 554-3200 Dr. Richard Nodurft, M.D.La Jolla, CA · $1,353 in drug and device payments (2025) · Telehealth ·
(858) 455-9100 Dr. Selena KuoLa Jolla, CA · $142 in drug and device payments (2025) · Telehealth ·
(800) 926-8273 Dr. Sushrut Thiruvengadam, M.D.La Jolla, CA · $571 in drug and device payments (2025) · Telehealth ·
(858) 554-8955 Dr. Syed Fehmi, M.D., M.SLa Jolla, CA · $3,252 in drug and device payments (2025) · Telehealth ·
(409) 789-6938 Dr. Walter Coyle, M.D.La Jolla, CA · $86,486 in drug and device payments (2025) · Telehealth ·
(858) 554-8879 Dr. Warren Reidel, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(858) 554-8054 Dr. Williamson Strum, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(858) 554-8880 Dr. Wilson Kwong, M.D.La Jolla, CA · $3,257 in drug and device payments (2025) · Telehealth ·
(619) 543-2347 Dr. Conrad Cox, M.D.Lakewood, CA · $2,876 in drug and device payments (2025) ·
(562) 461-8584 Dr. Ali Banaie, M.D.La Mesa, CA · $2,048 in drug and device payments (2025) · Telehealth ·
(619) 469-5400 Dr. Dhuha Alhankawi, M.D.La Mesa, CA · $918 in drug and device payments (2025) · Telehealth ·
(619) 460-4055 Dr. Kaveh Hoda, MDLa Mesa, CA · No drug or device payments recorded (2025) ·
(619) 469-5400 Dr. Michael Lajin, M.D.La Mesa, CA · $70 in drug and device payments (2025) · Telehealth ·
(619) 460-4055 Dr. Mohammad Soleimanpour, M.D. Dr. Mohammed Saadi, M.D.La Mesa, CA · $570 in drug and device payments (2025) · Telehealth ·
(619) 303-9000 Dr. Rokay Kamyar, M.D.La Mesa, CA · $154 in drug and device payments (2025) ·
(619) 460-4055 Dr. Rosemary Tu, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(619) 469-5400 Dr. Canagartnam Pathmarajah, M.D.Lancaster, CA · $146 in drug and device payments (2025) ·
(661) 948-0803 Dr. Duminda Suraweera, M.D.Lancaster, CA · $644 in drug and device payments (2025) · Telehealth ·
(661) 529-7550 Dr. Edward Wong, M.D.Lancaster, CA · $42 in drug and device payments (2025) ·
(661) 945-1874 Dr. Gurcharn Singh, MDLancaster, CA · No drug or device payments recorded (2025) ·
(661) 726-2500 Dr. Jatinder Pruthi, M.D.Lancaster, CA · $23,490 in drug and device payments (2025) · Telehealth ·
(661) 948-0803 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.
- Acid reflux
- IBS
- Crohn disease
- Ulcerative colitis
- Celiac disease
- Colon cancer screening
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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