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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. Christopher Jong, M.D.
South Pasadena, CA · No drug or device payments recorded (2025) · (626) 818-3112
Dr. Dolly Kim, MD MBA
South Pasadena, CA · No drug or device payments recorded (2025) · (626) 240-4842
Dr. Jay Thomas, MD
South Pasadena, CA · $26 in drug and device payments (2025) · (626) 487-0036
Dr. Lauren Karp
South Pasadena, CA · No drug or device payments recorded (2025) · (626) 862-8119
Dr. Adeline Segundo, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Alaap Mehta, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Alan Le, MD
South San Francisco, CA · $103 in drug and device payments (2025) · (650) 742-2000
Dr. Andrew Cheng, MD
South San Francisco, CA · $55,070,157 in drug and device payments (2025) · (650) 487-6486
Dr. Aruna Chinnakotla, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Bambi Menes, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Barnabas Yik, MD
South San Francisco, CA · $125 in drug and device payments (2025) · (650) 742-2000
Dr. Caroline Tsen, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Charles Barr, M.D.
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 225-4867
Dr. Christopher Fowler, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. David Kim, MD
South San Francisco, CA · $17 in drug and device payments (2025) · (650) 742-2000
Dr. David Martin, M.D.
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 873-1115
Dr. David Seftel, M.D.
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 240-3105
Dr. Dirk Thye, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (415) 533-3236
Dr. Edward Fang, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Eva Liu, MD
South San Francisco, CA · $93 in drug and device payments (2025) · Telehealth · (650) 742-2000
Dr. Evie Kalmar, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 826-2945
Dr. Faith Wells, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 826-2945
Dr. Gerald Saliman, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Grace Kajiwara, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Grace Lay, DO
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Hulya Kaymaz, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Ikuko Ogihara, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Issa Khouri, MD
South San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (650) 742-2000
Dr. Jae Park, MD
South San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (650) 742-2000
Dr. James Gibboney, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. James Peros, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Jan Sy
South San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (650) 742-2000
Dr. Jeany Tay, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Jennifer Jones, M.D., PH.D.
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2304
Dr. Jennifer Larsen, M.D.
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Jennifer Shieh, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (408) 728-3101
Dr. Joel Manosalva, M.D.
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 588-5145
Dr. Karl Chan, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Kelly Yeh, M.D.
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-3144
Dr. Kenneth Lee, MD
South San Francisco, CA · $14 in drug and device payments (2025) · (650) 742-2000
Dr. Keon Pearson, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (844) 838-3322
Dr. Laura Yang, M.D.
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Liya Dorfman, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Matthew Mcclure, M.D,
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 246-7389
Dr. Michelle Caughey, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Nan Ye Lei, DO
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Natalia Bruchanski-gallagher, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Nathan Billett, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Neelima Mohan, MD
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000
Dr. Nigar Seven, M.D
South San Francisco, CA · No drug or device payments recorded (2025) · (650) 742-2000

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

Related

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.