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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. Georgia Allen, DO
Vallejo, CA · No drug or device payments recorded (2025) · (707) 553-5509
Dr. Gihan Farag, MD
Vallejo, CA · $71 in drug and device payments (2025) · Telehealth · (707) 651-1000
Dr. Hong Cheng, DO
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Husni Hasan, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Ian Concepcion, M.D.
Vallejo, CA · $32 in drug and device payments (2025) · (707) 651-1000
Dr. Irina Rozen, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Jaspreet Thind
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Jennifer Manickam, MD
Vallejo, CA · No drug or device payments recorded (2025) · Telehealth · (707) 651-1000
Dr. John Glenn, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. John Malone
Vallejo, CA · No drug or device payments recorded (2025) · (707) 556-3794
Dr. Jonathan Blanton, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Jonathan Kaner, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Karen Winter, DO
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Kelvin Kay, M.D.
Vallejo, CA · No drug or device payments recorded (2025) · (925) 876-3882
Dr. Khimberley Santiago, M.D.
Vallejo, CA · $32 in drug and device payments (2025) · (707) 651-2440
Dr. Lassia Vanhise, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Lauran Mizock, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Lawrence Lee, DO
Vallejo, CA · $32 in drug and device payments (2025) · (707) 651-1000
Dr. Lechi Pham, MD
Vallejo, CA · No drug or device payments recorded (2025) · Telehealth · (707) 651-1000
Dr. Lloyd Brunk, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Loi Lam, M.D.
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-4767
Dr. Lyudmila Fortenko, MD
Vallejo, CA · No drug or device payments recorded (2025) · Telehealth · (707) 651-1000
Dr. Melissa Vander Wal, M.D.
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-2440
Dr. Mercedes Rivera, M.D.
Vallejo, CA · No drug or device payments recorded (2025) · (562) 481-9212
Dr. Michael Clearfield, D.O.
Vallejo, CA · No drug or device payments recorded (2025) · (707) 784-2001
Dr. Naomi Rapport, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Neil Watter, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Nicholas Taylor, D.O.
Vallejo, CA · No drug or device payments recorded (2025) · (707) 554-4444
Dr. Peter Boorstein, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Randy Villanueva, D.O.
Vallejo, CA · $32 in drug and device payments (2025) · (707) 651-2440
Dr. Rebekah Chang, MD
Vallejo, CA · No drug or device payments recorded (2025) · Telehealth · (707) 651-1000
Dr. Richard Chesley, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Robert Anderson, M.D.
Vallejo, CA · No drug or device payments recorded (2025) · (707) 554-4444
Dr. Robert Quon, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Robert Wiebe, M.D.
Vallejo, CA · No drug or device payments recorded (2025) · (707) 562-8350
Dr. Ruben Velasquez, M.D.
Vallejo, CA · No drug or device payments recorded (2025) · Telehealth · (707) 644-5297
Dr. Scarlet Mcclure, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-2729
Dr. Sen Shaw, MD
Vallejo, CA · $463 in drug and device payments (2025) · Telehealth · (707) 651-1000
Dr. Sridhar Chitti, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Stephanie Peterson, MD
Vallejo, CA · $195 in drug and device payments (2025) · (707) 651-1000
Dr. Sundeep Kang, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 554-5367
Dr. Su Win, MD
Vallejo, CA · $32 in drug and device payments (2025) · (707) 651-1000
Dr. Tatiana Tam, DO
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Thor Start, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Voltaire Velarde, MD
Vallejo, CA · No drug or device payments recorded (2025) · Telehealth · (707) 552-9670
Dr. Wendy Brody, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Wesley Mcbride, M.D.
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-2440
Dr. Thomas Drakes, M.D.
Valley Spgs, CA · No drug or device payments recorded (2025) · (209) 772-7070
Dr. Ara Thomassian, M.D.
Valley Village, CA · $160 in drug and device payments (2025) · Telehealth · (818) 487-0040
Dr. Aron Rotman, M.D.
Valley Village, CA · No drug or device payments recorded (2025) · (760) 636-8326

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.