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Internal Medicine Doctors in California

Data updated monthly · Last refresh October 2026

17,715 Internal Medicine providers practice in California, including 4,245 (24%) 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.

17,715providers
4,245telehealth
Los Angelestop city

Internal Medicine by city in California

Choose a city to see providers there.

Internal Medicine in Los Angeles1,417 providers
Internal Medicine in San Francisco1,322 providers
Internal Medicine in San Diego970 providers
Internal Medicine in Sacramento602 providers
Internal Medicine in Oakland434 providers
Internal Medicine in San Jose433 providers
Internal Medicine in Stanford383 providers
Internal Medicine in Fresno339 providers
Internal Medicine in Torrance230 providers
Internal Medicine in Long Beach225 providers
Internal Medicine in Bakersfield210 providers
Internal Medicine in Loma Linda209 providers
Internal Medicine in Palo Alto189 providers
Internal Medicine in Anaheim188 providers
Internal Medicine in Orange188 providers
Internal Medicine in Riverside188 providers
Internal Medicine in Walnut Creek184 providers
Internal Medicine in Santa Monica170 providers
Internal Medicine in La Jolla161 providers
Internal Medicine in Roseville159 providers
Internal Medicine in Irvine155 providers
Internal Medicine in Beverly Hills152 providers
Internal Medicine in Santa Clara142 providers
Internal Medicine in Pasadena138 providers

Internal Medicine 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. Eric Panahi, M.D.
Fountain Valley, CA · $2,117 in drug and device payments (2025) · Telehealth · (714) 825-0891
Dr. Erin Jo
Fountain Valley, CA · No drug or device payments recorded (2025) · (877) 844-0012
Dr. Fazilath Fatima, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (657) 241-3592
Dr. Felina Innaci Dass, MD
Fountain Valley, CA · $118 in drug and device payments (2025) · (714) 549-4081
Dr. Gail Frances Liezl Abcede, M.D.
Fountain Valley, CA · $22 in drug and device payments (2025) · (657) 241-3592
Dr. George Hong, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 964-6229
Dr. Georgina Marquez, DVM
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 241-9001
Dr. Hoang Nguyen, M.D.
Fountain Valley, CA · $340 in drug and device payments (2025) · Telehealth · (714) 531-7930
Dr. Ihong Chen, MD
Fountain Valley, CA · $17 in drug and device payments (2025) · Telehealth · (714) 378-5330
Dr. Ivan Rudenko, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 665-1797
Dr. Jack Middlebrooks, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 965-2500
Dr. Jacob Koopman, DO
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 665-1797
Dr. Janice Rivelle
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 965-2500
Dr. Jason Gajarsa, M.D.
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 751-3540
Dr. Jessica Vo, M.D.
Fountain Valley, CA · No drug or device payments recorded (2025) · (877) 844-0012
Dr. Joel Bartlett, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (657) 241-9090
Dr. John Ho, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 377-2900
Dr. John Wang, M.D.
Fountain Valley, CA · $27 in drug and device payments (2025) · Telehealth · (714) 378-5330
Dr. Joseph Desanto, M.D.
Fountain Valley, CA · $39 in drug and device payments (2025) · (949) 432-0918
Dr. Julie Oh, MD
Fountain Valley, CA · $85 in drug and device payments (2025) · (714) 717-4415
Dr. Karen Don, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 965-2500
Dr. Kari Vu, MD
Fountain Valley, CA · $187 in drug and device payments (2025) · (760) 835-4140
Dr. Kathryn Rigonan, MD
Fountain Valley, CA · $478 in drug and device payments (2025) · (714) 754-0100
Dr. Ketan Bhakta, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · Telehealth · (714) 847-6727
Dr. Kimberly Motta, M.D.
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 665-1797
Dr. Kim Trinh, M.D.
Fountain Valley, CA · $1,261 in drug and device payments (2025) · (714) 549-1300
Dr. Kristine Arthur, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 549-1300
Dr. Lalita Komanapalli, MD
Fountain Valley, CA · $17 in drug and device payments (2025) · Telehealth · (714) 378-5330
Dr. Lauri Seymour, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 965-2500
Dr. Lawrence Tran, M.D.
Fountain Valley, CA · No drug or device payments recorded (2025) · (949) 340-9530
Dr. Long Hua, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · Telehealth · (714) 477-8400
Dr. Mahmood Mirbagheri, MD
Fountain Valley, CA · $125 in drug and device payments (2025) · (714) 665-1797
Dr. Mai Phuong Nguyen, MD
Fountain Valley, CA · $57 in drug and device payments (2025) · (844) 527-8620
Dr. Maryanne Ibrahim, M.D.
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 665-4614
Dr. Melanie Lin, MD
Fountain Valley, CA · $14 in drug and device payments (2025) · (714) 378-6307
Dr. Michael Benefiel, M.D.
Fountain Valley, CA · No drug or device payments recorded (2025) · (949) 340-9530
Dr. Michael Duan, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (877) 844-0012
Dr. Mikio Tachibana, MD
Fountain Valley, CA · $567 in drug and device payments (2025) · Telehealth · (714) 966-2800
Dr. Minsen Mok, M.D.
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 306-6104
Dr. Monica Hanna, D.O.
Fountain Valley, CA · No drug or device payments recorded (2025) · (877) 844-0012
Dr. Nancy Hanna, M.D.
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 665-1797
Dr. Naomi Cheung, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 549-1300
Dr. Nathan Kwong, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 665-1797
Dr. Nguyen Nguyen, M.D.
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 665-1797
Dr. Nicole Chow, MD
Fountain Valley, CA · $57 in drug and device payments (2025) · (714) 965-2500
Dr. Paul Sychangco, M.D,
Fountain Valley, CA · No drug or device payments recorded (2025) · (877) 844-0012
Dr. Richard Cho, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (949) 923-3200
Dr. Samiya Hussain, M.D.
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 665-1797
Dr. Sang Noh, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 957-6055
Dr. Sheila Nguyen, MD
Fountain Valley, CA · $15 in drug and device payments (2025) · (714) 665-1797

Conditions Internal Medicine providers in California commonly treat

Patients often search by condition rather than specialty. These are conditions typically managed by Internal Medicine providers. Individual practices vary, so confirm with the provider before booking.

Common questions

How many Internal Medicine providers are in California?

There are 17,715 Internal Medicine providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.

Do Internal Medicine providers in California offer telehealth?

Yes. 4,245 of the 17,715 Internal Medicine providers in California (about 24%) report offering telehealth services in CMS data.

Which cities in California have the most Internal Medicine providers?

Los Angeles (1,417), San Francisco (1,322), San Diego (970) have the highest concentration of Internal Medicine providers in California.

How many Internal Medicine providers in California received drug or device company payments?

5,614 of 17,715 Internal Medicine providers in California (32%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.

What conditions do Internal Medicine providers in California treat?

Internal Medicine providers commonly treat high blood pressure, type 2 diabetes, high cholesterol, preventive care, chronic disease management 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 Internal Medicine Doctors in California work in independent practices or large health systems?

Among 10,847 Internal Medicine Doctors in California enrolled in Medicare, 20% bill through a solo or small practice with fewer than 10 clinicians, 12% through a mid-size group of 10 to 99, and 67% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.

Which hospitals do Internal Medicine Doctors in California work at?

According to CMS facility affiliation records, the California hospitals where the most Internal Medicine Doctors hold privileges are Stanford Health Care in Stanford; UCSF Medical Center in San Francisco; Ronald Reagan UCLA Medical Center in Los Angeles.

Related reading on HealthcareDiscovery.AI

Internal Medicine in all 50 states Search all 17,715 in the directory Ask Zach for help choosing

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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 Internal Medicine in California? Get featured.