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 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. Tarek Moqattash, M.D.Apple Valley, CA · $147 in drug and device payments (2025) · Telehealth ·
(760) 906-9362 Dr. Umair Khizer, MDApple Valley, CA · No drug or device payments recorded (2025) ·
(760) 946-4233 Dr. Suzy Nassralla, MDAptos, CA · No drug or device payments recorded (2025) · Telehealth ·
(831) 458-6200 Dr. Victoria KaufmannAptos, CA · No drug or device payments recorded (2025) · Telehealth ·
(831) 458-6200 Dr. Aivi Doan, M.D./M.P.H. Dr. Andrew Lee, M.D.Arcadia, CA · $183 in drug and device payments (2025) ·
(626) 446-4719 Dr. Aung Kyaw Zaw, MDArcadia, CA · $48 in drug and device payments (2025) · Telehealth ·
(626) 821-6411 Dr. Chisato Oba, M.D.Arcadia, CA · No drug or device payments recorded (2025) ·
(626) 462-1884 Dr. Christine Castano, MDArcadia, CA · No drug or device payments recorded (2025) ·
(626) 462-1892 Dr. Cody Geddes, D.O,Arcadia, CA · $1,228 in drug and device payments (2025) ·
(626) 446-1190 Dr. Dag Peter Linna, M.D.Arcadia, CA · $15 in drug and device payments (2025) · Telehealth ·
(626) 254-8733 Dr. Darren Kwong, D.O.Arcadia, CA · No drug or device payments recorded (2025) · Telehealth ·
(626) 254-9540 Dr. Dennis Liu, MDArcadia, CA · $46 in drug and device payments (2025) · Telehealth ·
(626) 445-7490 Dr. Diana Christine Alano, M.D.Arcadia, CA · No drug or device payments recorded (2025) ·
(626) 795-2244 Dr. Dino Clarizio, M.D.Arcadia, CA · $2,963 in drug and device payments (2025) · Telehealth ·
(626) 821-3290 Dr. Dipti Patel, MDArcadia, CA · No drug or device payments recorded (2025) ·
(626) 462-1884 Dr. Edvard Davtyan, MD, BSRS, RT(R)(F) Dr. Eric Chwa, M.DArcadia, CA · $940 in drug and device payments (2025) ·
(626) 821-6411 Dr. Eric Hsu, MDArcadia, CA · No drug or device payments recorded (2025) ·
(626) 898-8000 Dr. Farahnaz Namvari, M.D.Arcadia, CA · $150 in drug and device payments (2025) ·
(626) 254-2119 Dr. Guy Natale, M.D.Arcadia, CA · No drug or device payments recorded (2025) ·
(626) 447-9340 Dr. Haig Manjikian, M.D.Arcadia, CA · No drug or device payments recorded (2025) ·
(626) 462-1844 Dr. Herman Sardjono, MDArcadia, CA · $404 in drug and device payments (2025) ·
(626) 821-5305 Dr. Hongsheng Wei, MDArcadia, CA · $756 in drug and device payments (2025) ·
(626) 446-1599 Dr. Ida Wang, M.D.Arcadia, CA · $1,824 in drug and device payments (2025) · Telehealth ·
(626) 447-8000 Dr. Ingrid Chen, M.D.Arcadia, CA · No drug or device payments recorded (2025) ·
(626) 462-1884 Dr. Ivonne Diaz, MDArcadia, CA · No drug or device payments recorded (2025) ·
(626) 795-2244 Dr. James Lin, M.D.Arcadia, CA · $2,441 in drug and device payments (2025) · Telehealth ·
(626) 447-5800 Dr. Jaykumar Shah, M.D.Arcadia, CA · $405 in drug and device payments (2025) ·
(626) 446-4404 Dr. John Lee, MDArcadia, CA · No drug or device payments recorded (2025) ·
(626) 348-8548 Dr. Joseph Elterman, M.D.Arcadia, CA · $131 in drug and device payments (2025) ·
(626) 254-2293 Dr. Josh Weng, M.D.Arcadia, CA · $2,404 in drug and device payments (2025) ·
(626) 447-4483 Dr. Jun Xu, M.D.Arcadia, CA · $3,454 in drug and device payments (2025) ·
(626) 701-5882 Dr. Kirit Shah, M.D.Arcadia, CA · $336 in drug and device payments (2025) ·
(626) 445-5577 Dr. Kuancheng Chen, MDArcadia, CA · $303 in drug and device payments (2025) ·
(626) 821-9075 Dr. Levon Gazarian, M.DArcadia, CA · $1,490 in drug and device payments (2025) ·
(626) 446-1190 Dr. Lianne HoArcadia, CA · No drug or device payments recorded (2025) ·
(626) 898-8000 Dr. Loanne Tran, M.D., MPHArcadia, CA · $277 in drug and device payments (2025) · Telehealth ·
(626) 446-0810 Dr. Lorrie Melby, M.D.Arcadia, CA · No drug or device payments recorded (2025) ·
(626) 462-1891 Dr. Mahyar Sadeghi Tari, M.D.Arcadia, CA · $42 in drug and device payments (2025) · Telehealth ·
(949) 395-6659 Dr. Maral Gazarian, DOArcadia, CA · $474 in drug and device payments (2025) ·
(626) 446-1190 Dr. Maria Santos-montemayor, MDArcadia, CA · $20 in drug and device payments (2025) · Telehealth ·
(626) 462-1884 Dr. Mary Jones, M.D.Arcadia, CA · No drug or device payments recorded (2025) ·
(626) 446-6134 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.
- High blood pressure
- Type 2 diabetes
- High cholesterol
- Preventive care
- Chronic disease management
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.
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