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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. Douglas Hegstad, M.D.
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5700
Dr. Duc To, MD
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5700
Dr. Francesca Paterno
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-4000
Dr. Gamal Ghaly, MD
Moreno Valley, CA · No drug or device payments recorded (2025) · Telehealth · (951) 656-5333
Dr. Gary Thompson, DO
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5700
Dr. Ijeoma Uche, M.D, PHARMD
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 242-2226
Dr. Jackson Heilbronn, DO
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-4000
Dr. Jane Bontatibus, DO
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5909
Dr. Jeffrey Katz, MD
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5700
Dr. Jeffrey Olson, M.D.
Moreno Valley, CA · $14 in drug and device payments (2025) · (951) 247-5809
Dr. Jessica Obi, MD
Moreno Valley, CA · $18 in drug and device payments (2025) · (909) 988-2555
Dr. Jithu Susan Mathew, M.D.
Moreno Valley, CA · No drug or device payments recorded (2025) · Telehealth · (866) 984-7483
Dr. Jody Esguerra, MD
Moreno Valley, CA · $24 in drug and device payments (2025) · (951) 486-5909
Dr. Joel Pengson, MD
Moreno Valley, CA · $1,859 in drug and device payments (2025) · Telehealth · (951) 243-6460
Dr. John Lee, DO
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5909
Dr. Johnny Liquete, MD
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 697-1150
Dr. John-vincent Arcilla, M.D.
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-4000
Dr. Kathie Huang, MD
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 988-9500
Dr. Kimberly Borden, MD
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-4000
Dr. Lakshmi Puvvula, M.D.
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5700
Dr. Lawrence Loo, MD
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5700
Dr. Linnea Amesur, D.O.
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5914
Dr. Lynette Ilano
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 988-9500
Dr. Lynnetta Skoretz, M.D.
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-4640
Dr. Maureen Nwaokoro, DO
Moreno Valley, CA · No drug or device payments recorded (2025) · (415) 813-7602
Dr. Mena Saad, DO
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-4000
Dr. Michael Matus, M.D.
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5700
Dr. Michael Ree, D.O.
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-4000
Dr. Michael Ulrich
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-4000
Dr. Mikaela Lewis, D.O
Moreno Valley, CA · $17 in drug and device payments (2025) · (866) 984-7483
Dr. Mindy Phan, DO
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5909
Dr. Minho Yu, D.O.
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5704
Dr. Mohamed Abu-qaoud, M.D.
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-4640
Dr. Nereida Pena, DO
Moreno Valley, CA · No drug or device payments recorded (2025) · Telehealth · (509) 949-2095
Dr. Nneka Oluoha, M.D
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-4000
Dr. Roger Garrison, DO
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5700
Dr. Rostam Vohoumani, DO
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5907
Dr. Rowena Mak-huang, M.D.
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 247-5809
Dr. Sarath Witana, M.D.
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 243-6460
Dr. Scott Allen, M.D.
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5573
Dr. Shannon Marie Carbajal, M.D.
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 988-9500
Dr. Sharanya Kumar, MD
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5909
Dr. Sharareh Movafagh-tofigh, M.D., PH.D.
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 485-0335
Dr. Sheila Loharuka, D.O.
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 571-2350
Dr. Shelly Xing Gammon, MD
Moreno Valley, CA · No drug or device payments recorded (2025) · Telehealth · (866) 984-7483
Dr. Simon Christopher Lim, M.D.
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-4000
Dr. Stanley Schwartz, M.D
Moreno Valley, CA · $356 in drug and device payments (2025) · (951) 924-3244
Dr. Steven Chrysafides, DO
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-4000
Dr. Stuart Hicks-thompson, DO
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 486-5909
Dr. Sue Min Kwon, MD
Moreno Valley, CA · No drug or device payments recorded (2025) · (951) 988-9500

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.