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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. Charissa Castro, MD
Bellflower, CA · No drug or device payments recorded (2025) · Telehealth · (562) 461-3000
Dr. Charles Kung, M.D.
Bellflower, CA · No drug or device payments recorded (2025) · Telehealth · (562) 920-1632
Dr. Christian Thiim, DO
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Christopher Lozano, MD
Bellflower, CA · No drug or device payments recorded (2025) · Telehealth · (562) 461-3000
Dr. Curtis Kawata, MD
Bellflower, CA · No drug or device payments recorded (2025) · Telehealth · (562) 461-3000
Dr. Dana Saadat, M.D., PH.D.
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-5409
Dr. Daniel Lim, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Daniel Valentini, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Dan Tang, MD
Bellflower, CA · $144 in drug and device payments (2025) · (562) 461-3000
Dr. Darren Shimabukuro, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. David Chiu, MD
Bellflower, CA · No drug or device payments recorded (2025) · Telehealth · (562) 461-3000
Dr. Dean Tran, DO
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Diana Wang, MD
Bellflower, CA · $169 in drug and device payments (2025) · (562) 461-3000
Dr. Donald Chen, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Donald Fields, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Earl Bautista, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Eddie Kim, MD
Bellflower, CA · $295 in drug and device payments (2025) · (562) 461-3000
Dr. Erich Salvacion, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Fee Kyan, M.D.
Bellflower, CA · No drug or device payments recorded (2025) · (562) 804-0100
Dr. Ghassan Gholmieh, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Han Nguyen, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Henya Paul, MD
Bellflower, CA · No drug or device payments recorded (2025) · Telehealth · (562) 461-3000
Dr. Jacqueline Khchirian, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Jane Fealy, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Jennifer Nguyen, MD
Bellflower, CA · $121 in drug and device payments (2025) · (562) 461-3000
Dr. Johnson Lim, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Jonathan Lee, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Jose Ruiz, MD
Bellflower, CA · $24 in drug and device payments (2025) · (562) 461-3000
Dr. Judy Kwan, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Kristine Pham, MD
Bellflower, CA · $365 in drug and device payments (2025) · (562) 461-3000
Dr. Kuan Pok Wong, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 866-1764
Dr. Laura Nguyen, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Lesley Chooi, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Lily Do, DO
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-1179
Dr. Lynn Thai, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Mahyar Derakhshani, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Marc Kurzbard, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Marcus Magallanes, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Margarita Santamaria, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. May Wong, MD
Bellflower, CA · $197 in drug and device payments (2025) · (562) 461-3000
Dr. Mei-yoong Yap, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Melvin Lim, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Minhchau Pham, MD
Bellflower, CA · No drug or device payments recorded (2025) · Telehealth · (562) 461-3000
Dr. Oliver Nguyen, MD
Bellflower, CA · $23 in drug and device payments (2025) · Telehealth · (562) 461-3000
Dr. Paul Lee, MD
Bellflower, CA · $121 in drug and device payments (2025) · (562) 461-3000
Dr. Philip Lim, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 804-6661
Dr. Robert Karm, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Ronald Hamamura, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Rowena Javier, MD
Bellflower, CA · No drug or device payments recorded (2025) · (562) 461-3000
Dr. Sanat Patel, M.D.
Bellflower, CA · $42 in drug and device payments (2025) · Telehealth · (562) 867-8681

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.