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. Sara Jaka, MDPittsburg, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 432-3318 Dr. Shalini Madugundi, M.DPittsburg, CA · $22 in drug and device payments (2025) · Telehealth ·
(925) 432-3318 Dr. Wengang Zhang, M.D.Pittsburg, CA · $45 in drug and device payments (2025) · Telehealth ·
(925) 432-3318 Dr. Xiao Yang, M.D.Pittsburg, CA · $169 in drug and device payments (2025) · Telehealth ·
(925) 301-8487 Dr. Ali Houshyar, MDPlacentia, CA · No drug or device payments recorded (2025) ·
(714) 524-3880 Dr. Bhavesh Jansari, M.D.Placentia, CA · $190 in drug and device payments (2025) ·
(714) 203-1767 Dr. Jason Kurtz, D.O.Placentia, CA · $97 in drug and device payments (2025) · Telehealth ·
(714) 831-1844 Dr. Peter Kwon, M.D.Placentia, CA · No drug or device payments recorded (2025) ·
(714) 961-5423 Dr. Sarah Apollo, DOPlacentia, CA · No drug or device payments recorded (2025) ·
(714) 350-8934 Dr. Sarah Hood, PA-CPlacentia, CA · $404 in drug and device payments (2025) ·
(714) 524-3880 Dr. Shahla Sadighian, MDPlacentia, CA · No drug or device payments recorded (2025) ·
(714) 524-3880 Dr. Cesar Ang, MDPlacerville, CA · $201 in drug and device payments (2025) · Telehealth ·
(530) 626-2920 Dr. Gerardo Galang, MDPlacerville, CA · $37 in drug and device payments (2025) · Telehealth ·
(530) 626-2920 Dr. Joe AlfeghalyPlacerville, CA · No drug or device payments recorded (2025) ·
(530) 621-7700 Dr. Ketan Ajudia, M.D.Placerville, CA · No drug or device payments recorded (2025) ·
(530) 344-5432 Dr. Mohammed Siddiqi, MDPlacerville, CA · No drug or device payments recorded (2025) ·
(530) 622-1441 Dr. Robert Macy, MDPlacerville, CA · No drug or device payments recorded (2025) ·
(530) 622-1441 Dr. Thanh Trang Nguyen, MDPlacerville, CA · No drug or device payments recorded (2025) ·
(530) 622-3400 Dr. Zachary Walder, DOPlacerville, CA · $188 in drug and device payments (2025) ·
(530) 621-7700 Dr. Christine Lam, MDPlaya Vista, CA · No drug or device payments recorded (2025) ·
(424) 315-2364 Dr. Charleston Cone, MDPleasant Hill, CA · No drug or device payments recorded (2025) ·
(510) 978-2879 Dr. Claudia Husni, M.D, MPHPleasant Hill, CA · No drug or device payments recorded (2025) ·
(925) 363-2000 Dr. Lauren Gannon, MDPleasant Hill, CA · $59 in drug and device payments (2025) · Telehealth ·
(925) 676-1700 Dr. Shawn Rosen, M.D.Pleasant Hill, CA · $28 in drug and device payments (2025) · Telehealth ·
(925) 378-2007 Dr. Afshan Umair, MDPleasanton, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 847-5000 Dr. Ana Amog, MDPleasanton, CA · No drug or device payments recorded (2025) ·
(925) 847-5000 Dr. Anthony Koh, MDPleasanton, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 416-5470 Dr. Anuja Garg, MDPleasanton, CA · $117 in drug and device payments (2025) · Telehealth ·
(925) 263-9547 Dr. Archana Nair, M.D.Pleasanton, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 847-5100 Dr. Ayemyint Ma, MDPleasanton, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 847-5000 Dr. Badeia Morsy, MDPleasanton, CA · $72 in drug and device payments (2025) ·
(925) 224-0720 Dr. Benedict Buenviaje, MDPleasanton, CA · No drug or device payments recorded (2025) ·
(925) 847-5000 Dr. Bonnie Rathjen, M.D.Pleasanton, CA · No drug or device payments recorded (2025) ·
(925) 462-3664 Dr. Bruce Franklin, MDPleasanton, CA · No drug or device payments recorded (2025) ·
(925) 847-5000 Dr. Calvin Lei, MDPleasanton, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 416-5470 Dr. Cherry Lin, MDPleasanton, CA · No drug or device payments recorded (2025) ·
(925) 847-5000 Dr. David Chee, MDPleasanton, CA · $72 in drug and device payments (2025) ·
(925) 463-0590 Dr. Donald Rice, M.D.Pleasanton, CA · No drug or device payments recorded (2025) ·
(925) 846-7789 Dr. Donna Kwong, M.D.Pleasanton, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 462-7060 Dr. Gule-rana Masood, MDPleasanton, CA · No drug or device payments recorded (2025) ·
(925) 737-3785 Dr. Gurkamal Sandhu, MDPleasanton, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 534-6500 Dr. Jerome Deck, MDPleasanton, CA · No drug or device payments recorded (2025) ·
(925) 847-5000 Dr. Jyothi Ratti, M.D.Pleasanton, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 416-5470 Dr. Jyothi Sarma, M.D.Pleasanton, CA · $25 in drug and device payments (2025) · Telehealth ·
(925) 463-2918 Dr. Katherine Burck, M.D.Pleasanton, CA · No drug or device payments recorded (2025) ·
(925) 463-1400 Dr. Kevin Hart, M.D.Pleasanton, CA · No drug or device payments recorded (2025) ·
(925) 846-1492 Dr. Kusuma Hampapur, M.D.Pleasanton, CA · No drug or device payments recorded (2025) ·
(925) 462-1755 Dr. Larry Ford, MDPleasanton, CA · No drug or device payments recorded (2025) ·
(925) 847-5000 Dr. Malcolm Smith, MDPleasanton, CA · No drug or device payments recorded (2025) ·
(925) 847-5000 Dr. Manjeet Singh, M.D.Pleasanton, CA · No drug or device payments recorded (2025) ·
(925) 462-1755 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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