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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. Ricardo Machado Carvalhais
Loma Linda, CA · $24 in drug and device payments (2025) · (877) 558-6248
Dr. Robert Niihara, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Ronald Fernando, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 825-7084
Dr. Rosemarie Florian, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-7263
Dr. Rui-tao Zhang, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4884
Dr. Ruth Ramon
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4047
Dr. Ryan Marais, MD
Loma Linda, CA · No drug or device payments recorded (2025) · Telehealth · (909) 558-2191
Dr. Sabrina Sirabonian
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Samira Rahmanian, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4884
Dr. Shawn Kim, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Shirley Bae, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4085
Dr. Shirley Tan, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 825-7084
Dr. Shobha Aiyar, M.D.
Loma Linda, CA · $16 in drug and device payments (2025) · (909) 825-7084
Dr. Sicily Bradley, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4000
Dr. Sigve Tonstad, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-2870
Dr. Sophie Sun, MD, PHD
Loma Linda, CA · $22 in drug and device payments (2025) · (877) 558-6248
Dr. Suchaya Jinamornphongs, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-2870
Dr. Su Hline, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-2191
Dr. Supakanya Wongrakpanich, M.D
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 958-6600
Dr. Surakshya Regmi, M.D.
Loma Linda, CA · $851 in drug and device payments (2025) · Telehealth · (909) 558-4499
Dr. Susan Hall, M.D.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-2191
Dr. Suzanne Rizkalla, M.D.
Loma Linda, CA · $1,289 in drug and device payments (2025) · Telehealth · (909) 478-1100
Dr. Tahseen Shareef, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 203-3825
Dr. Talisa Foust, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Taranjit Natt, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 478-7063
Dr. Terence Sonuga, M.D
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Theodore Nguyen, MD
Loma Linda, CA · $30 in drug and device payments (2025) · (909) 558-4884
Dr. Todd Kessler, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 825-7084
Dr. Tricia Guadiz, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4174
Dr. Tri Luu, M.D
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-8131
Dr. Trisha Pandey, DO
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Truclinh Nguyen, D.O.
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-8131
Dr. Tyler Haase, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Victoria Liokumovich, MD
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-8131
Dr. Vivek Bhatt
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Vu Nguyen
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-4074
Dr. Won Jin Jeon, MD
Loma Linda, CA · $125 in drug and device payments (2025) · (909) 558-6688
Dr. Wubanche Zellalem, D.O
Loma Linda, CA · No drug or device payments recorded (2025) · (909) 558-8131
Dr. Yasamin Majeed, MD
Loma Linda, CA · $126 in drug and device payments (2025) · (909) 558-4074
Dr. Yas Casey
Loma Linda, CA · $126 in drug and device payments (2025) · (909) 825-7084
Dr. Yasmin Yusufaly, M.D
Loma Linda, CA · $204 in drug and device payments (2025) · (909) 825-7984
Dr. Yinglin Gao
Loma Linda, CA · $933 in drug and device payments (2025) · (909) 558-4884
Dr. Yoshiaki Suzuki, MD
Loma Linda, CA · $84 in drug and device payments (2025) · (909) 558-4074
Dr. Zachary Hanson, DO, MA
Loma Linda, CA · $378 in drug and device payments (2025) · (909) 558-4000
Dr. Ali Ammar, MD
Lomita, CA · $605 in drug and device payments (2025) · (310) 622-4995
Dr. Anjum Qazi, M.D.
Lomita, CA · $116 in drug and device payments (2025) · Telehealth · (424) 305-4169
Dr. David Keller, MD
Lomita, CA · No drug or device payments recorded (2025) · (310) 896-5435
Dr. Edgar El Sayad, M.D.
Lomita, CA · $3,848 in drug and device payments (2025) · Telehealth · (310) 325-0600
Dr. Nabil El Sayad, M.D.
Lomita, CA · $3,474 in drug and device payments (2025) · Telehealth · (310) 325-0600
Dr. Anne Little, M.D.
Lompoc, CA · No drug or device payments recorded (2025) · (805) 735-4292

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

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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.