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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. Ketan Shah, M.D., M.B.A.
Orange, CA · $8,404 in drug and device payments (2025) · Telehealth · (949) 744-5441
Dr. Kiran Sachdev, MD
Orange, CA · $106 in drug and device payments (2025) · Telehealth · (888) 717-4463
Dr. Kristi Lindsey, FNPC
Orange, CA · $1,203 in drug and device payments (2025) · Telehealth · (714) 835-5100
Dr. Kyle Fortinsky, MD
Orange, CA · $524 in drug and device payments (2025) · (714) 456-6745
Dr. Mark Salem
Orange, CA · $2,950 in drug and device payments (2025) · Telehealth · (714) 456-7358
Dr. Neetika Srivastava, M.D.
Orange, CA · No drug or device payments recorded (2025) · Telehealth · (714) 456-6187
Dr. Nimisha Parekh, MD
Orange, CA · $4,119 in drug and device payments (2025) · Telehealth · (714) 456-8068
Dr. Ousama Alkhatib, MD
Orange, CA · $1,732 in drug and device payments (2025) · Telehealth · (714) 835-7700
Dr. Pavan Mankal, M.D.
Orange, CA · $1,788 in drug and device payments (2025) · Telehealth · (714) 456-8888
Dr. Piotr Sowa, M.D.
Orange, CA · $305 in drug and device payments (2025) · Telehealth · (714) 456-6745
Dr. Robert Fearn, MBCHB
Orange, CA · $104 in drug and device payments (2025) · Telehealth · (714) 456-7890
Dr. Robert Lee, M.D.
Orange, CA · No drug or device payments recorded (2025) · Telehealth · (888) 717-4463
Dr. Sandra Sunhee Park, MD
Orange, CA · $12,347 in drug and device payments (2025) · Telehealth · (888) 717-4463
Dr. Shravani Reddy, M.D
Orange, CA · $2,543 in drug and device payments (2025) · Telehealth · (888) 717-4463
Dr. Shruti Ariza, MD
Orange, CA · $1,757 in drug and device payments (2025) · Telehealth · (714) 835-5100
Dr. Usman Rahim, M.D.
Orange, CA · $2,398 in drug and device payments (2025) · Telehealth · (888) 717-4463
Dr. William Collins, MD
Orange, CA · No drug or device payments recorded (2025) · (714) 639-3363
Dr. William Karnes, MD
Orange, CA · $104 in drug and device payments (2025) · Telehealth · (888) 717-4463
Dr. William Metzger, MD
Orange, CA · $28 in drug and device payments (2025) · (714) 835-7700
Dr. Harvey Olsen, M.D.
Orinda, CA · No drug or device payments recorded (2025) · (925) 254-6025
Dr. Leonard Cohen, M.D.
Orinda, CA · No drug or device payments recorded (2025) · (925) 254-7123
Dr. Alexander Tonthat, MD, MBA
Oroville, CA · $916 in drug and device payments (2025) · (530) 533-8500
Dr. Nathaniel Howard, MD
Oroville, CA · No drug or device payments recorded (2025) · (530) 533-6061
Dr. Cecilio Cabansag, M.D.
Oxnard, CA · No drug or device payments recorded (2025) · (805) 486-1213
Dr. Constante Abaya, MD
Oxnard, CA · No drug or device payments recorded (2025) · (805) 983-0730
Dr. Donald Miller, MD
Oxnard, CA · $389 in drug and device payments (2025) · Telehealth · (805) 983-0521
Dr. John Billesdon, M.D.
Oxnard, CA · No drug or device payments recorded (2025) · (805) 983-0521
Dr. Justin Marasigan, DO
Oxnard, CA · $1,503 in drug and device payments (2025) · Telehealth · (805) 983-0521
Dr. Karen Simon, M.D.
Oxnard, CA · $1,742 in drug and device payments (2025) · Telehealth · (805) 983-0521
Dr. Keval Shah, D.O.
Oxnard, CA · $3,466 in drug and device payments (2025) · Telehealth · (805) 983-0521
Dr. Mohammad Khan, M.D.
Oxnard, CA · $18 in drug and device payments (2025) · (805) 983-0521
Dr. Paul Sanchez, M.D.
Oxnard, CA · No drug or device payments recorded (2025) · (805) 983-0521
Dr. Raymond Kodesch, MD
Palm Desert, CA · No drug or device payments recorded (2025) · (760) 345-1000
Dr. Steven Dorfman, M.D.
Palm Desert, CA · No drug or device payments recorded (2025) · (760) 770-8678
Dr. Brian Cleary, MD
Palm Springs, CA · No drug or device payments recorded (2025) · (760) 773-4560
Dr. Homan Abdollahzadeh, MD
Palm Springs, CA · $469 in drug and device payments (2025) · Telehealth · (760) 864-4163
Dr. Howard Congress, M.D.
Palm Springs, CA · No drug or device payments recorded (2025) · (760) 778-6153
Dr. Jorge Gutierrez, M.D.
Palm Springs, CA · No drug or device payments recorded (2025) · (760) 773-4560
Dr. Mehrdad Asgeri, MD
Palm Springs, CA · $1,530 in drug and device payments (2025) · Telehealth · (440) 454-2770
Dr. Michael Schwartz, D.O.
Palm Springs, CA · $288 in drug and device payments (2025) · (760) 424-8224
Dr. Vijay Agarwal, M.D.
Palm Springs, CA · $89 in drug and device payments (2025) · (505) 766-5471
Dr. Aarti Rao, MD
Palo Alto, CA · $610 in drug and device payments (2025) · Telehealth · (650) 853-2972
Dr. Andrew Roorda, M.D.
Palo Alto, CA · $429 in drug and device payments (2025) · Telehealth · (304) 293-4123
Dr. Bishr Omary, MD, PHD
Palo Alto, CA · No drug or device payments recorded (2025) · (650) 493-5000
Dr. Brennan Scott, MD
Palo Alto, CA · $842 in drug and device payments (2025) · Telehealth · (650) 321-4121
Dr. Chelsea Xu
Palo Alto, CA · $703 in drug and device payments (2025) · Telehealth · (650) 853-2972
Dr. Chiazotam Ekekezie, M.D.
Palo Alto, CA · No drug or device payments recorded (2025) · Telehealth · (650) 723-4000
Dr. Erick Chan, MD
Palo Alto, CA · $204 in drug and device payments (2025) · Telehealth · (650) 853-2972
Dr. Eugenio Picazo, MD
Palo Alto, CA · No drug or device payments recorded (2025) · (650) 323-3935
Dr. Harry Greenberg, MD
Palo Alto, CA · No drug or device payments recorded (2025) · (650) 493-5000

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.