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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. Sudha Praba, MD
Camp Pendleton, CA · No drug or device payments recorded (2025) · (760) 725-1185
Dr. Ali Khademi, DO
Capitola, CA · $80 in drug and device payments (2025) · Telehealth · (831) 662-9999
Dr. James Gray, M.D.
Carlsbad, CA · No drug or device payments recorded (2025) · (254) 744-7309
Dr. Amanpal Singh, MD
Carmichael, CA · $632 in drug and device payments (2025) · Telehealth · (916) 536-2596
Dr. David Schneiderman, MD
Carmichael, CA · No drug or device payments recorded (2025) · (916) 863-1000
Dr. Kuldip Sandhu, MD
Carmichael, CA · $377 in drug and device payments (2025) · Telehealth · (916) 536-2596
Dr. Michael Massaro
Carmichael, CA · $1,155 in drug and device payments (2025) · Telehealth · (916) 536-2596
Dr. Nalini Valluru, MBBS
Carmichael, CA · $1,089 in drug and device payments (2025) · Telehealth · (916) 536-2596
Dr. Sidney Yassinger, M.D.
Carmichael, CA · No drug or device payments recorded (2025) · (916) 965-9650
Dr. Todd Zimmerman, M.D.
Carmichael, CA · No drug or device payments recorded (2025) · (916) 965-3702
Dr. Jeffrey Singerman, M.D.
Castro Valley, CA · $14 in drug and device payments (2025) · Telehealth · (510) 537-4415
Dr. Peter Hooberman, M.D.
Castro Valley, CA · No drug or device payments recorded (2025) · (510) 537-4415
Dr. Satya Allaparthi, MD
Castro Valley, CA · No drug or device payments recorded (2025) · Telehealth · (510) 537-4415
Dr. Stephen Lee, M.D.
Castro Valley, CA · No drug or device payments recorded (2025) · (510) 537-4415
Dr. Vishal Ghevariya, M.D.
Castro Valley, CA · No drug or device payments recorded (2025) · (510) 537-4415
Dr. Wei-fang Ko, M.D.
Castro Valley, CA · No drug or device payments recorded (2025) · (510) 537-4415
Dr. Donald Furman, MD
Cerritos, CA · No drug or device payments recorded (2025) · (562) 741-4461
Dr. Jaesoo Pak, M.D.
Cerritos, CA · $1,743 in drug and device payments (2025) · (562) 809-8082
Dr. Daniel Ramirez, DO
Chico, CA · $648 in drug and device payments (2025) · (530) 332-7300
Dr. Eric Ford, MD
Chico, CA · No drug or device payments recorded (2025) · (530) 894-8800
Dr. Fong Kuei Cheng, M.D.
Chico, CA · $283 in drug and device payments (2025) · (530) 332-3986
Dr. Peter Bangsund, M.D.
Chico, CA · $22 in drug and device payments (2025) · (530) 894-8800
Dr. Shaheen Rasheed, M.D.
Chico, CA · $200 in drug and device payments (2025) · (530) 894-8800
Dr. Stephen Pearce, MD
Chico, CA · No drug or device payments recorded (2025) · (530) 894-8800
Dr. Hussain Al-darsani, M.D.
Chino, CA · $876 in drug and device payments (2025) · (909) 287-0440
Dr. Mohammad Shakfeh, M.D
Chino, CA · $282 in drug and device payments (2025) · Telehealth · (909) 606-4860
Dr. Sudhir Reddy, M.D.
Chino, CA · $162 in drug and device payments (2025) · (909) 591-6446
Dr. Umesh Shah, M.D.
Chino, CA · No drug or device payments recorded (2025) · (909) 591-6414
Dr. Edward Singer, M.D.
Chula Vista, CA · $60 in drug and device payments (2025) · Telehealth · (619) 421-1155
Dr. Erick Alayo, M.D.
Chula Vista, CA · $1,537 in drug and device payments (2025) · Telehealth · (619) 382-3315
Dr. Errol Korn, M.D.
Chula Vista, CA · $179 in drug and device payments (2025) · (619) 425-5544
Dr. Gregory Wiener, M.D
Chula Vista, CA · $43 in drug and device payments (2025) · (619) 585-8883
Dr. Ivan Cubas, MD
Chula Vista, CA · $1,368 in drug and device payments (2025) · (619) 489-5611
Dr. John Duque, M.D.
Chula Vista, CA · $179 in drug and device payments (2025) · (619) 691-0240
Dr. Mark Johnson, M.D.
Chula Vista, CA · No drug or device payments recorded (2025) · (619) 585-0313
Dr. Steven Brozinsky, M.D.
Chula Vista, CA · No drug or device payments recorded (2025) · (619) 421-1155
Dr. Richard Chun, M.D.
Citrus Heights, CA · $84 in drug and device payments (2025) · (916) 737-5555
Dr. Alex Aslan, M.D.
Concord, CA · No drug or device payments recorded (2025) · (925) 682-7730
Dr. David Varon, M.D.
Concord, CA · $443 in drug and device payments (2025) · (925) 676-6622
Dr. Jenny Jew, M.D.
Concord, CA · $3,230 in drug and device payments (2025) · Telehealth · (925) 682-7730
Dr. Kalyani Maganti, M.D.
Concord, CA · $2,957 in drug and device payments (2025) · (925) 682-7730
Dr. Richard Messian, M.D.
Concord, CA · No drug or device payments recorded (2025) · (925) 687-9650
Dr. Tedmond Szeto, MD
Concord, CA · $52 in drug and device payments (2025) · Telehealth · (925) 987-9650
Dr. Marco Paez, M.D.
Corona, CA · $894 in drug and device payments (2025) · Telehealth · (951) 808-6298
Dr. Mladen Jecmenica, M.D.
Corona, CA · $420 in drug and device payments (2025) · (951) 934-0505
Dr. M. Mazen Jamal, M.D., M.P.H.
Corona, CA · $959 in drug and device payments (2025) · Telehealth · (951) 934-0505
Dr. Omar Shahbaz, M.D., M.S.
Corona, CA · $948 in drug and device payments (2025) · Telehealth · (951) 808-6298
Dr. Shima Ghavimi, M.D.
Corona, CA · $180 in drug and device payments (2025) · (951) 934-0505
Dr. Eric Szu
Coronado, CA · $406 in drug and device payments (2025) · (619) 522-0399
Dr. Karen Gordon, MD
Coronado, CA · $45 in drug and device payments (2025) · (619) 435-1138

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.