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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. Kiho Woo, M.D.
Fullerton, CA · No drug or device payments recorded (2025) · (714) 449-4800
Dr. Kristopher Huston, M.D.
Fullerton, CA · $61 in drug and device payments (2025) · (714) 871-3280
Dr. Lalitha Vakkalanka, M.D.
Fullerton, CA · No drug or device payments recorded (2025) · (714) 773-4111
Dr. Leo Garcia, M.D.
Fullerton, CA · $51 in drug and device payments (2025) · Telehealth · (714) 626-8610
Dr. Linda Lam, M.D.
Fullerton, CA · No drug or device payments recorded (2025) · (714) 871-3280
Dr. Michael Katz, MD
Fullerton, CA · $220 in drug and device payments (2025) · (714) 992-3969
Dr. Mythili Nagaraj, M.D.
Fullerton, CA · $275 in drug and device payments (2025) · Telehealth · (714) 905-4072
Dr. Naureen Tareen, M.D.
Fullerton, CA · No drug or device payments recorded (2025) · (714) 403-9942
Dr. Panagiotis Bougas, M.D.
Fullerton, CA · $135 in drug and device payments (2025) · (714) 446-7454
Dr. Patrick Su, D.O.
Fullerton, CA · $25 in drug and device payments (2025) · (714) 992-3969
Dr. Pavani Reddy, MD
Fullerton, CA · $102 in drug and device payments (2025) · (714) 446-7454
Dr. Pengyi Zhu, DO
Fullerton, CA · $90 in drug and device payments (2025) · (714) 992-3969
Dr. Pius Kim, M.D.
Fullerton, CA · $510 in drug and device payments (2025) · (714) 447-5027
Dr. Rajiv Bhavsar, M.D.
Fullerton, CA · $881 in drug and device payments (2025) · Telehealth · (714) 441-0591
Dr. Robert Francis, M.D.
Fullerton, CA · No drug or device payments recorded (2025) · (714) 446-7800
Dr. Ruben Cabral, MD
Fullerton, CA · $49 in drug and device payments (2025) · Telehealth · (714) 626-8610
Dr. Sammie Cheng, M.D.
Fullerton, CA · No drug or device payments recorded (2025) · (714) 705-9877
Dr. Sang Hoon Ahn, M.D.
Fullerton, CA · $124 in drug and device payments (2025) · Telehealth · (657) 888-9919
Dr. Sara Choi, DO
Fullerton, CA · $335 in drug and device payments (2025) · (714) 992-3969
Dr. Sothy Pheng, MD
Fullerton, CA · $562 in drug and device payments (2025) · (978) 551-8088
Dr. Stephen Yoon, M.D.
Fullerton, CA · $234 in drug and device payments (2025) · (714) 992-3000
Dr. Steven Luminais, MD
Fullerton, CA · $1,046 in drug and device payments (2025) · Telehealth · (714) 449-5900
Dr. Tuan Trinh, M.D.
Fullerton, CA · $550 in drug and device payments (2025) · (714) 992-3000
Dr. Uma Rao, MD
Fullerton, CA · $33 in drug and device payments (2025) · (714) 992-2765
Dr. Victor Nekrasov, M.D.
Fullerton, CA · $67 in drug and device payments (2025) · (714) 449-6230
Dr. Yang Li, MD
Fullerton, CA · $145 in drug and device payments (2025) · (714) 992-3257
Dr. Mohiuddin Waseem, M.D.
Galt, CA · No drug or device payments recorded (2025) · (209) 745-8080
Dr. Sonia Baur
Garberville, CA · No drug or device payments recorded (2025) · (707) 923-7068
Dr. Tiffany Ordonez, M.D.
Garberville, CA · $94 in drug and device payments (2025) · (707) 923-3921
Dr. Abraham Golbari, M.D.
Gardena, CA · $22 in drug and device payments (2025) · Telehealth · (310) 327-8746
Dr. Dongjin Sung, M.D.
Gardena, CA · $1,264 in drug and device payments (2025) · Telehealth · (424) 551-3110
Dr. Dong Trang, D.O., M.P.H
Gardena, CA · No drug or device payments recorded (2025) · Telehealth · (310) 324-2592
Dr. Gail Gabourel, MSPA-C
Gardena, CA · No drug or device payments recorded (2025) · (310) 327-1357
Dr. Karisa Thayer, M.D.
Gardena, CA · No drug or device payments recorded (2025) · (310) 327-1357
Dr. Katelyn Klein
Gardena, CA · No drug or device payments recorded (2025) · (310) 392-8636
Dr. Keith Andrew Ebilane, M.D.
Gardena, CA · No drug or device payments recorded (2025) · Telehealth · (310) 225-2825
Dr. Kimberly Eddings-reece, MD
Gardena, CA · No drug or device payments recorded (2025) · (310) 225-2825
Dr. Larry Suk, MD
Gardena, CA · $1,521 in drug and device payments (2025) · Telehealth · (310) 515-9871
Dr. Owen Robinson, M.D.
Gardena, CA · No drug or device payments recorded (2025) · (310) 538-1381
Dr. Peter Chong, MD
Gardena, CA · No drug or device payments recorded (2025) · (310) 217-5470
Dr. Pranit Shrestha, M.D., M.P.H.
Gardena, CA · $74 in drug and device payments (2025) · (310) 532-4200
Dr. Ron Yamane, M.D.
Gardena, CA · $280 in drug and device payments (2025) · (310) 327-6400
Dr. Siar Basharmal, M.D.
Gardena, CA · $39 in drug and device payments (2025) · (310) 851-4705
Dr. Soumya Kambalapalli, MD
Gardena, CA · $647 in drug and device payments (2025) · (512) 300-5318
Dr. Vivian Umeozulu, M.D.
Gardena, CA · No drug or device payments recorded (2025) · Telehealth · (877) 515-8113
Dr. Adriana Longo, M.D.
Garden Grove, CA · No drug or device payments recorded (2025) · (714) 741-3685
Dr. Anthony Sobero, DO
Garden Grove, CA · No drug or device payments recorded (2025) · (833) 574-2273
Dr. Asaad Hakim, M.D.
Garden Grove, CA · $18 in drug and device payments (2025) · (714) 537-7800
Dr. Benjamin Navarro, M.D.
Garden Grove, CA · No drug or device payments recorded (2025) · (714) 636-7852
Dr. Bryan Choi, MD
Garden Grove, CA · No drug or device payments recorded (2025) · (888) 499-9303

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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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.