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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. Jessica Finley, MD
Santa Monica, CA · $30 in drug and device payments (2025) · Telehealth · (310) 566-6330
Dr. Jessica Liao, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · Telehealth · (310) 319-4262
Dr. Jessica Zhang, MD
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 315-8900
Dr. Jester Galiza, MD
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 315-8900
Dr. Ji Young Lee, MD
Santa Monica, CA · No drug or device payments recorded (2025) · Telehealth · (424) 314-7800
Dr. Joan Feltman, M.D.
Santa Monica, CA · $104 in drug and device payments (2025) · Telehealth · (310) 315-0131
Dr. Joanna Jan, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · (855) 268-2822
Dr. Jocelyn Lo
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 315-8900
Dr. Joel Isackson, MD
Santa Monica, CA · No drug or device payments recorded (2025) · Telehealth · (310) 264-0565
Dr. Joey Tu, MD
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 319-4698
Dr. John Andrews, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · Telehealth · (310) 264-0165
Dr. Johnson Hua, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 319-4698
Dr. Jonathan Barthelet
Santa Monica, CA · $98 in drug and device payments (2025) · Telehealth · (310) 264-0065
Dr. Jonathan Weaver, MD
Santa Monica, CA · $919 in drug and device payments (2025) · (310) 264-0065
Dr. Joseph Nwadiuko, MD MPH
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 315-8900
Dr. Joseph Yeh, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 319-4698
Dr. Joshua Khalili, MD
Santa Monica, CA · $19 in drug and device payments (2025) · Telehealth · (310) 319-4377
Dr. Julia Lee, M.D.
Santa Monica, CA · $187 in drug and device payments (2025) · (310) 656-1701
Dr. Justin Laube, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 998-9118
Dr. Justin Rogoski, MD
Santa Monica, CA · No drug or device payments recorded (2025) · (855) 488-9550
Dr. Kaitlyn Fruin
Santa Monica, CA · No drug or device payments recorded (2025) · Telehealth · (310) 825-7921
Dr. Kalei Hosaka, MD
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 315-8900
Dr. Katelyn Stepanyan, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 319-4698
Dr. Kristopher Yoon, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · Telehealth · (310) 315-8900
Dr. Laura Simpler
Santa Monica, CA · No drug or device payments recorded (2025) · Telehealth · (424) 315-2327
Dr. Lawrence Rolle
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 998-9118
Dr. Lawrence Yu, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 319-4698
Dr. Leila Karimpoor, DO
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 453-1324
Dr. Lewis Kanengiser, M.D.
Santa Monica, CA · $515 in drug and device payments (2025) · Telehealth · (310) 315-0188
Dr. Lida Ghaderi, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 998-8600
Dr. Lindsay Wells
Santa Monica, CA · $17 in drug and device payments (2025) · Telehealth · (310) 582-6200
Dr. Li Zhou, MD
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 319-4698
Dr. Lorien Ahn, MD
Santa Monica, CA · $49 in drug and device payments (2025) · (310) 998-9118
Dr. Lovelee Brown, MD
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 392-8636
Dr. Maria Gonzalez
Santa Monica, CA · $86 in drug and device payments (2025) · Telehealth · (310) 395-9442
Dr. Maria Patanwala, MD
Santa Monica, CA · No drug or device payments recorded (2025) · Telehealth · (310) 315-8900
Dr. Mark Biscow, MD
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 264-0065
Dr. Mark Mcgowan, MD
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 656-1700
Dr. Mark Nachman, MD
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 315-0111
Dr. Marla Lipsyc-sharf, MD
Santa Monica, CA · $13,614 in drug and device payments (2025) · Telehealth · (310) 998-4747
Dr. Mary Fok
Santa Monica, CA · $19 in drug and device payments (2025) · Telehealth · (310) 998-9118
Dr. Matthew Nienaber, D.O.
Santa Monica, CA · $857 in drug and device payments (2025) · Telehealth · (310) 575-3100
Dr. Michael Fuchs, M.D.
Santa Monica, CA · $112 in drug and device payments (2025) · Telehealth · (310) 829-0199
Dr. Michael Zelman, M.D.
Santa Monica, CA · $14 in drug and device payments (2025) · (310) 449-1007
Dr. Michelle Rastegar, M.D.
Santa Monica, CA · $129 in drug and device payments (2025) · (310) 314-6200
Dr. Michelle Rios, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 319-4377
Dr. Mitchell Becker, M.D.
Santa Monica, CA · $123 in drug and device payments (2025) · (310) 828-4461
Dr. Monya De, MD, MPH
Santa Monica, CA · No drug or device payments recorded (2025) · (650) 260-5360
Dr. Nathan Mclaughlin
Santa Monica, CA · No drug or device payments recorded (2025) · Telehealth · (310) 825-7375
Dr. Neal Shanblatt, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · Telehealth · (310) 451-0111

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.