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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. Hiteshi Thakker, M.D.
Rialto, CA · $210 in drug and device payments (2025) · (909) 583-2741
Dr. Ikechi Obiocha, MD
Rialto, CA · $141 in drug and device payments (2025) · (909) 822-1164
Dr. Mehrdad Ghahremani-ghajar, D.O.
Rialto, CA · $30 in drug and device payments (2025) · Telehealth · (909) 472-8375
Dr. Natasha Alexander, MD
Rialto, CA · No drug or device payments recorded (2025) · Telehealth · (909) 874-2371
Dr. Paul Chen, M.D.
Rialto, CA · $369 in drug and device payments (2025) · Telehealth · (909) 421-2700
Dr. Ravindranath Shahane, M.D.
Rialto, CA · $695 in drug and device payments (2025) · (909) 875-3595
Dr. Rogelio Toh, M.D.
Rialto, CA · No drug or device payments recorded (2025) · (909) 421-2700
Dr. Sun Soung, M.D.
Rialto, CA · No drug or device payments recorded (2025) · (909) 875-3595
Dr. Yousuf Sadiq, MD
Rialto, CA · $32 in drug and device payments (2025) · Telehealth · (909) 820-7377
Dr. Zeid Kayali, M.D.
Rialto, CA · $50,660 in drug and device payments (2025) · (909) 883-2999
Dr. Brian Chan, MD
Richmond, CA · $183 in drug and device payments (2025) · Telehealth · (510) 307-1500
Dr. Brigid Mccaw, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. Carmela Romano, DO
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. Chew May Cheah, MD
Richmond, CA · No drug or device payments recorded (2025) · Telehealth · (510) 239-9896
Dr. David Velek, MD
Richmond, CA · No drug or device payments recorded (2025) · Telehealth · (510) 307-1500
Dr. Edward Smyth, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. Elizabeth Thomas, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. George Jackson, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 981-3209
Dr. Jane Bonacich, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. Jeffrey East, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. Joanne Uomini, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. John Sheppard, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. John Tysell, M.D.
Richmond, CA · No drug or device payments recorded (2025) · (510) 932-8137
Dr. Julie Steiner, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1555
Dr. Kanaka Shetty, M.D.
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. Kathy Down, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. Lolly Schiffman, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. Luisa Tsang, MD MPH
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. Marita Bautista, MD
Richmond, CA · No drug or device payments recorded (2025) · Telehealth · (510) 307-1555
Dr. Mark Geliebter, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. Maylene Briones, D.O.
Richmond, CA · No drug or device payments recorded (2025) · (510) 367-0839
Dr. Ronald Berman, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. Sarah Rikleen, MD
Richmond, CA · No drug or device payments recorded (2025) · (415) 400-6978
Dr. Sharon Jones, MD
Richmond, CA · No drug or device payments recorded (2025) · Telehealth · (510) 233-1990
Dr. Surendra Shenoy, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. Teeb Al-samarrai, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 620-3189
Dr. Thomas Gourley, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. Vikas Chhabra, M.D.
Richmond, CA · No drug or device payments recorded (2025) · Telehealth · (510) 307-1555
Dr. William Shalen, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. Xiang Liao, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 307-1500
Dr. Yong Lee, MD
Richmond, CA · No drug or device payments recorded (2025) · (510) 871-1637
Dr. Amikjit Reen, M.D.
Ridgecrest, CA · $64 in drug and device payments (2025) · Telehealth · (760) 463-1613
Dr. Andrew Modic, MD
Ridgecrest, CA · No drug or device payments recorded (2025) · (760) 499-3855
Dr. Cherie Vanhuse, M.D.
Ridgecrest, CA · No drug or device payments recorded (2025) · Telehealth · (760) 499-3855
Dr. Douglas Roberts, M.D.
Ridgecrest, CA · $2,061 in drug and device payments (2025) · Telehealth · (760) 446-4571
Dr. Ehssan Pour Ramezani
Ridgecrest, CA · No drug or device payments recorded (2025) · (760) 499-3899
Dr. Jeffery Tun, M.D.
Ridgecrest, CA · No drug or device payments recorded (2025) · (760) 446-6404
Dr. Kevin Flanigan, MD
Ridgecrest, CA · No drug or device payments recorded (2025) · (760) 499-3855
Dr. Lawrence Cosner, MD
Ridgecrest, CA · No drug or device payments recorded (2025) · (760) 499-3855
Dr. Minu Ambika Rajendran, MD
Ridgecrest, CA · No drug or device payments recorded (2025) · (760) 499-3855

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.