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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. Jesus Carlos, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (213) 623-2225
Dr. Jill Klessig, MD
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (310) 825-6301
Dr. Jimmy Soliman, M.D.
Los Angeles, CA · $273 in drug and device payments (2025) · (323) 778-6215
Dr. Jiyeon Jeong
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 825-7375
Dr. Joan Kho, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 783-4011
Dr. Joann Elmore
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (310) 206-6232
Dr. Joanne Scherr, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 783-4011
Dr. Joannie Cathey Cook, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 724-7448
Dr. Jocelyn Dee
Los Angeles, CA · $399 in drug and device payments (2025) · (323) 226-2170
Dr. Jodi Friedman, MD
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (310) 267-9656
Dr. Jody Chuang, M.D, PH.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (626) 421-6727
Dr. Joel Byrd, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 568-4421
Dr. Joel Levine, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 857-2000
Dr. Johnathan Kao, M.D., M.P.H.
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (310) 205-7310
Dr. John Brodhead, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 442-5100
Dr. John Buch, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 857-2000
Dr. John Chang, MD
Los Angeles, CA · $19 in drug and device payments (2025) · (310) 825-0631
Dr. John Herald, M.D.
Los Angeles, CA · $473 in drug and device payments (2025) · (310) 786-1170
Dr. John Jay Cadavona, MD
Los Angeles, CA · $136 in drug and device payments (2025) · (310) 267-9643
Dr. John Kim, M.D.
Los Angeles, CA · $61 in drug and device payments (2025) · (323) 783-4516
Dr. John Koo, MD
Los Angeles, CA · $467 in drug and device payments (2025) · (310) 668-4574
Dr. John Lattin, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 825-9111
Dr. John Liu, MD
Los Angeles, CA · $428 in drug and device payments (2025) · Telehealth · (213) 484-8474
Dr. John Londono, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 857-2000
Dr. John Mafi, M.D.
Los Angeles, CA · $122 in drug and device payments (2025) · Telehealth · (310) 794-2280
Dr. John Martin, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 783-4011
Dr. John Mattison, MD
Los Angeles, CA · $37,800 in drug and device payments (2025) · (323) 783-4011
Dr. John Moe, PHD, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 295-2255
Dr. John Nastro, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 927-7132
Dr. John Nixon, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 226-7556
Dr. John Park, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (833) 574-2273
Dr. Johnpaul Singh, MD
Los Angeles, CA · $218 in drug and device payments (2025) · (310) 237-0023
Dr. John Sam, MD
Los Angeles, CA · $67 in drug and device payments (2025) · (323) 267-1214
Dr. John Sherman, M.D.
Los Angeles, CA · $1,273 in drug and device payments (2025) · Telehealth · (310) 855-8081
Dr. John Wang, MD
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (323) 857-2000
Dr. John Yong, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (213) 977-2131
Dr. John Zipperer, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (424) 330-2838
Dr. Jonas Green, MD, MPH
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 794-0150
Dr. Jonathan Boiarsky
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 267-7849
Dr. Jonathan Garcia
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 825-7375
Dr. Jonathan Green, M.D.
Los Angeles, CA · $15 in drug and device payments (2025) · (866) 586-7667
Dr. Jonathan Grein, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 423-5574
Dr. Jonathan Katz, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 857-2000
Dr. Jonathan Neyer, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (310) 206-6232
Dr. Jonathan Wiebe, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (434) 227-2628
Dr. Jon Desilets, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 783-4011
Dr. Jon Kea, M,D.
Los Angeles, CA · $18 in drug and device payments (2025) · (310) 423-5252
Dr. Joon Choung, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (213) 893-5100
Dr. Joon Kim, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 226-5707
Dr. Joon Park, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 783-4516

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.