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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. John Hobson, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 898-3120
Dr. John Petrini, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 681-1761
Dr. Rebecca Salvo, DO
Santa Barbara, CA · $27 in drug and device payments (2025) · Telehealth · (805) 682-3585
Dr. Sherif Michael
Santa Barbara, CA · $1,815 in drug and device payments (2025) · (805) 682-3585
Dr. Stephen Lemon, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 682-3585
Dr. Thomas Aguirre, M.D.
Santa Barbara, CA · $271 in drug and device payments (2025) · Telehealth · (805) 682-3585
Dr. Thomas Caves, M.D.
Santa Barbara, CA · $1,718 in drug and device payments (2025) · Telehealth · (805) 898-3120
Dr. Thomas Mellor, D.O.
Santa Barbara, CA · $842 in drug and device payments (2025) · Telehealth · (805) 898-3120
Dr. Vincent Derosa, M.D.
Santa Barbara, CA · $2,114 in drug and device payments (2025) · Telehealth · (805) 681-1761
Dr. William Hahn, M.D.
Santa Barbara, CA · $858 in drug and device payments (2025) · Telehealth · (805) 681-1761
Dr. Atenodoro Ruiz, MD
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-1000
Dr. Caitlin Doan, MD
Santa Clara, CA · No drug or device payments recorded (2025) · Telehealth · (408) 851-1000
Dr. Cary Kraft, M.D.
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-2750
Dr. Dan Li, M.D.
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-2722
Dr. Derrick Siao, M.D.
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-2750
Dr. Joanna Ready, MD
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-1000
Dr. Krisna Chai, M.D.
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-1000
Dr. Michael Ahn, MD
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-1000
Dr. Spencer Fung, MD
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-1000
Dr. Stephen Moff, MD
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-1000
Dr. Timothy Steck, MD
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-1000
Dr. Aly Mohamed, MD
Santa Cruz, CA · $55 in drug and device payments (2025) · (831) 460-7350
Dr. David Anjelly, M.D.
Santa Cruz, CA · No drug or device payments recorded (2025) · Telehealth · (831) 430-7130
Dr. Eric Yoo, M.D.
Santa Cruz, CA · No drug or device payments recorded (2025) · Telehealth · (503) 494-4373
Dr. Geoffrey Bernstein, MD
Santa Cruz, CA · No drug or device payments recorded (2025) · (831) 458-5887
Dr. Gordon Lee, MD
Santa Cruz, CA · $210 in drug and device payments (2025) · (831) 476-4230
Dr. Joseph Boyd Palascak, MD
Santa Cruz, CA · No drug or device payments recorded (2025) · (831) 460-7350
Dr. Justin Bennet, MD PHD
Santa Cruz, CA · $23 in drug and device payments (2025) · (831) 713-5050
Dr. Kourosh Ghassemi, MD
Santa Cruz, CA · No drug or device payments recorded (2025) · Telehealth · (831) 460-7350
Dr. Krish Gandhi
Santa Cruz, CA · No drug or device payments recorded (2025) · (831) 460-7350
Dr. Kuntal Thaker, MD
Santa Cruz, CA · No drug or device payments recorded (2025) · Telehealth · (831) 460-7350
Dr. Thomas Larson
Santa Cruz, CA · No drug or device payments recorded (2025) · (831) 460-7350
Dr. Treta Goyal, M.B.B.S,, M.P.H.
Santa Cruz, CA · $378 in drug and device payments (2025) · (831) 462-4444
Dr. Vijaya Mukthinuthalapati, MD
Santa Cruz, CA · $1,660 in drug and device payments (2025) · Telehealth · (831) 260-3591
Dr. Zenowij Majuk, MD
Santa Cruz, CA · $1,354 in drug and device payments (2025) · (831) 713-5050
Dr. Atul Vachhani, MD
Santa Maria, CA · $679 in drug and device payments (2025) · (805) 922-6581
Dr. Constantine Melitas, M.D.
Santa Maria, CA · $448 in drug and device payments (2025) · Telehealth · (805) 346-3456
Dr. Igor Nastaskin, MD
Santa Maria, CA · $1,545 in drug and device payments (2025) · (805) 922-6581
Dr. Omar Viramontes, MD
Santa Maria, CA · $1,134 in drug and device payments (2025) · (805) 922-6581
Dr. Paramjit Benipal, MD
Santa Maria, CA · $441 in drug and device payments (2025) · Telehealth · (805) 922-6581
Dr. Robert Evans, MD
Santa Maria, CA · $2,490 in drug and device payments (2025) · (805) 922-6581
Dr. Thomas Hsia, MD
Santa Maria, CA · $1,709 in drug and device payments (2025) · (805) 922-6581
Dr. Alireza Sedarat, MD
Santa Monica, CA · $21,554 in drug and device payments (2025) · Telehealth · (310) 582-6240
Dr. Benjamin Nulsen
Santa Monica, CA · $39 in drug and device payments (2025) · Telehealth · (310) 582-6240
Dr. Carl Nordstrom, M.D.
Santa Monica, CA · $141 in drug and device payments (2025) · Telehealth · (310) 582-6240
Dr. Charles Frankel, M.D.
Santa Monica, CA · $287 in drug and device payments (2025) · (310) 453-1871
Dr. Claudia Sanmiguel, M.D.
Santa Monica, CA · $2,299 in drug and device payments (2025) · Telehealth · (310) 829-6789
Dr. Daisy Lankarani, M.D.
Santa Monica, CA · $3,859 in drug and device payments (2025) · Telehealth · (310) 829-6789
Dr. Danice Hertz, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 453-1871
Dr. David Yamini, M.D.
Santa Monica, CA · $1,669 in drug and device payments (2025) · Telehealth · (310) 285-3005

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

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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.