HealthcareDiscovery.AI / Doctors / California / Gastroenterology

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. David Weinman, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 939-6531
Dr. Denise Kalmaz, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (619) 543-2347
Dr. Derek Patel, M.D.
San Diego, CA · $19 in drug and device payments (2025) · Telehealth · (619) 543-5321
Dr. Donald Lipkis, MD
San Diego, CA · $18 in drug and device payments (2025) · (619) 287-9100
Dr. Douglas Politoske, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 292-7527
Dr. Edward Yang, M.D.
San Diego, CA · $2,293 in drug and device payments (2025) · (800) 926-8273
Dr. Emily Singh, M.D.
San Diego, CA · $1,484 in drug and device payments (2025) · Telehealth · (858) 605-7390
Dr. Eric Low, M.D., M.P.H.
San Diego, CA · $62 in drug and device payments (2025) · Telehealth · (619) 543-6268
Dr. Erin Song, MD
San Diego, CA · $246 in drug and device payments (2025) · Telehealth · (858) 499-2600
Dr. Ethan Bortniker, M.D.
San Diego, CA · $2,155 in drug and device payments (2025) · Telehealth · (800) 926-8273
Dr. Eugenio Grunvald, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 543-3622
Dr. Fady Youssef, M.D.
San Diego, CA · $393 in drug and device payments (2025) · Telehealth · (619) 543-6268
Dr. Faizi Hai, MD
San Diego, CA · $1,036 in drug and device payments (2025) · (619) 291-6064
Dr. George Longstreth, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Gordon Hunt, M.D.
San Diego, CA · $115 in drug and device payments (2025) · (619) 543-5227
Dr. Heather Patton, M.D.
San Diego, CA · $119 in drug and device payments (2025) · (619) 543-7544
Dr. Hongfei Fang, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (858) 939-6531
Dr. Hyun Kim, MD
San Diego, CA · $1,990 in drug and device payments (2025) · Telehealth · (858) 292-7527
Dr. James Wolosin, M.D.
San Diego, CA · $133 in drug and device payments (2025) · (858) 939-6531
Dr. Janice Oh, MD
San Diego, CA · No drug or device payments recorded (2025) · (833) 574-2273
Dr. Jeffrey Pressman, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 292-7527
Dr. Jennifer Kimble, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Jesus Rivera-nieves, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 534-5495
Dr. John Chang, MD
San Diego, CA · $11,550 in drug and device payments (2025) · Telehealth · (800) 926-8273
Dr. John Lyons, M.D.
San Diego, CA · $1,838 in drug and device payments (2025) · Telehealth · (858) 605-7151
Dr. John Person, M.D.
San Diego, CA · $110 in drug and device payments (2025) · (858) 939-6531
Dr. Jose Antonio Almario, MD
San Diego, CA · $2,051 in drug and device payments (2025) · Telehealth · (858) 939-6531
Dr. Joseph Schwarz, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Joseph Traube, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 678-6087
Dr. Joshua Penfield, MBCHB
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (858) 939-6531
Dr. Joshua Rubin, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (619) 543-2347
Dr. Joshua Steichen, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (858) 621-4016
Dr. Kathryn Driggers
San Diego, CA · No drug or device payments recorded (2025) · (619) 532-9725
Dr. Kay Chen
San Diego, CA · No drug or device payments recorded (2025) · (858) 552-8585
Dr. Kevin Haynes, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 291-6064
Dr. Ki-yoon Kim, M.D.
San Diego, CA · $796 in drug and device payments (2025) · (619) 291-6064
Dr. Kristina Seeger, M.D.
San Diego, CA · $806 in drug and device payments (2025) · Telehealth · (858) 605-7855
Dr. Kyle Geary, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 552-8585
Dr. Levon Tantoushian, DO
San Diego, CA · $14 in drug and device payments (2025) · (619) 266-3332
Dr. Leybelis Padilla, MD
San Diego, CA · $5,913 in drug and device payments (2025) · (619) 532-8983
Dr. Maram Zakko, MD
San Diego, CA · $831 in drug and device payments (2025) · (858) 675-3100
Dr. Mario Chojkier, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 552-8585
Dr. Mary Whitlock Fithian, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Matthew Bender
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (858) 292-7527
Dr. Matthew Sitzer, MD
San Diego, CA · $28 in drug and device payments (2025) · (619) 528-5000
Dr. Matthew Tsai, M.D., PH.D
San Diego, CA · $146 in drug and device payments (2025) · Telehealth · (800) 926-8273
Dr. Maunoo Lee, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 532-6827
Dr. Megan Delvecchio, APRN
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (800) 926-8273
Dr. Meng Hua, MD
San Diego, CA · $305 in drug and device payments (2025) · Telehealth · (619) 287-7617
Dr. Michael Bennett, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 292-7527

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

Gastroenterology in all 50 states Search all 2,135 in the directory Ask Zach for help choosing

Related

Try a city like Tucson, a zip like 85016, or a specialty like psychiatry. For a doctor by name, use the full search.
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.