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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. Eun Jee Lee, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4000
Dr. Faisal Ansari, DO
Loma Linda, CA · $295 in drug and device payments (2025) · (909) 558-4884
Dr. Farris Al-manaseer, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. F Koteira, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-2870
Dr. Franz Fisher, M.D.
Loma Linda, CA · $149 in drug and device payments (2025) · (909) 825-7084
Dr. Geir Frivold, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 583-6097
Dr. George Isaac, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 825-7084
Dr. Grace Kwon
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Gregory Shedd
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Gurjit Sivia, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Hannah Lokos, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Hansen Kwok, M.D.
Loma Linda, CA · $1,358 in drug and device payments (2025) · (909) 825-7084
Dr. Harman Bhullar
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Heather Ferguson, MD
Loma Linda, CA · $134 in drug and device payments (2025) · (909) 651-5582
Dr. Hector Almanzar-ramos, MD
Loma Linda, CA · No drug or device payments recorded (2025) · Telehealth · (909) 558-4074
Dr. Hieu Duc Do, M.D
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4000
Dr. Hoa Nguyen, MD.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 583-6189
Dr. Huynh Pham, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4884
Dr. Hyein Ji, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Imdad Ahmad, M.D
Loma Linda, CA · $24 in drug and device payments (2025) · (909) 825-7084
Dr. Ivan Magnaye, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-2870
Dr. Ja Eun Koo
Loma Linda, CA · $92 in drug and device payments (2025) · (909) 558-4000
Dr. James Anholm, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 583-6098
Dr. James Hong, DO
Loma Linda, CA · No drug or device payments recorded (2025) · Telehealth · (909) 558-4884
Dr. James Huang, MD
Loma Linda, CA · $360 in drug and device payments (2025) · (909) 825-7084
Dr. Jason Hwang, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-6581
Dr. Jayaram Chandrasekar, D.O.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4000
Dr. Jazmin Bains
Loma Linda, CA · $105 in drug and device payments (2025) · (909) 558-4074
Dr. Jeffrey Wonoprabowo, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · Telehealth · (909) 558-7263
Dr. Jennifer Magalong, D.O.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-8131
Dr. Jerry Martell, M.D.
Loma Linda, CA · $24 in drug and device payments (2025) · (909) 558-2870
Dr. Jessika Matta, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4000
Dr. Jin Hyun Moon, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. John Bautista, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4222
Dr. John Byrne
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 583-6004
Dr. John Wang, M.D., PH.D
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4000
Dr. Jonathan Min, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Joseph Kim, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (971) 227-0030
Dr. Josianne Bailey, MD, MBA
Loma Linda, CA · No drug or device payments recorded (2025) · Telehealth · (909) 558-6491
Dr. Julia Berrospi-chia, M.D.
Loma Linda, CA · $40 in drug and device payments (2025) · (909) 825-7084
Dr. Katelyn Seward, DO
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4000
Dr. Katherine Domenici
Loma Linda, CA · $244 in drug and device payments (2025) · (909) 558-4174
Dr. Katherine Mower
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Kavita Nayak, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4000
Dr. Kenneth Cheung, DO
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-2822
Dr. Kenneth Collado, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Kenneth Maxwell, D.O.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-2191
Dr. Kevin Bera, MD
Loma Linda, CA · $401 in drug and device payments (2025) · (909) 558-4074
Dr. Kevin Nishino
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Krish Manchandia, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-2481

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.