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. Arnold Loo, D.O.Rohnert Park, CA · No drug or device payments recorded (2025) ·
(707) 585-7780 Dr. Bridgit Travinsky, M.D.Rohnert Park, CA · No drug or device payments recorded (2025) ·
(707) 206-3044 Dr. Hyejo Jun, MDRohnert Park, CA · No drug or device payments recorded (2025) · Telehealth ·
(707) 206-3044 Dr. Michael Bunce, MDRohnert Park, CA · No drug or device payments recorded (2025) ·
(707) 206-3000 Dr. Nana Barnes, MDRohnert Park, CA · No drug or device payments recorded (2025) ·
(707) 303-3600 Dr. Nicholas Regennitter, MDRohnert Park, CA · $40 in drug and device payments (2025) · Telehealth ·
(707) 585-8347 Dr. Paul Johnson, MDRohnert Park, CA · No drug or device payments recorded (2025) ·
(707) 206-3000 Dr. Sara Ganeless Levine, MDRohnert Park, CA · No drug or device payments recorded (2025) ·
(707) 206-3000 Dr. Steven Gelber, M.D.Rohnert Park, CA · No drug or device payments recorded (2025) ·
(707) 206-3044 Dr. Anna Mellor, MDRolling Hills Estates, CA · $17 in drug and device payments (2025) · Telehealth ·
(310) 645-1024 Dr. Christine Kuida, MDRolling Hills Estates, CA · $169 in drug and device payments (2025) · Telehealth ·
(310) 541-9511 Dr. Hanbyul ChoiRolling Hills Estates, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 303-3953 Dr. Hiva Bastanmehr, M.D.Rolling Hills Estates, CA · $390 in drug and device payments (2025) · Telehealth ·
(310) 517-4692 Dr. Hyunah Poa, MDRolling Hills Estates, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 303-3953 Dr. Laurence Gorlick, MDRolling Hills Estates, CA · No drug or device payments recorded (2025) ·
(310) 544-6858 Dr. Lorena Layrisse Landaeta, M.D.Rolling Hills Estates, CA · $638 in drug and device payments (2025) · Telehealth ·
(310) 517-4692 Dr. Omer Deen, MDRolling Hills Estates, CA · $197 in drug and device payments (2025) ·
(310) 994-5679 Dr. Robert Reiss, MDRolling Hills Estates, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 670-1120 Dr. Shih-fan SunRolling Hills Estates, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 303-3953 Dr. Alma Bathan-gerona, MDRomoland, CA · $150 in drug and device payments (2025) ·
(951) 246-3495 Dr. Andy Chen, MDRosemead, CA · No drug or device payments recorded (2025) ·
(888) 530-4415 Dr. David Lin, DORosemead, CA · $3,566 in drug and device payments (2025) ·
(626) 573-9090 Dr. David Nguyen, D.O.Rosemead, CA · No drug or device payments recorded (2025) ·
(626) 641-2119 Dr. Han Duong, M.D.& D.O.Rosemead, CA · $1,492 in drug and device payments (2025) · Telehealth ·
(626) 572-0005 Dr. Harold Hsu, M.D.Rosemead, CA · $147 in drug and device payments (2025) · Telehealth ·
(626) 280-6898 Dr. Hong Liang, M.D.Rosemead, CA · $932 in drug and device payments (2025) · Telehealth ·
(626) 280-8897 Dr. Josephine Choa, M.D.Rosemead, CA · $945 in drug and device payments (2025) ·
(626) 307-4785 Dr. Kelvin Chen, MDRosemead, CA · $216 in drug and device payments (2025) ·
(626) 741-5411 Dr. Melinda Phillips, M.D.Rosemead, CA · No drug or device payments recorded (2025) ·
(626) 286-1191 Dr. Quy Nguyen, MDRosemead, CA · No drug or device payments recorded (2025) ·
(626) 573-9003 Dr. Son Le, M.D.Rosemead, CA · $840 in drug and device payments (2025) · Telehealth ·
(626) 573-3545 Dr. Susan Heller, M.D.Rosemead, CA · No drug or device payments recorded (2025) ·
(626) 302-5397 Dr. Tam Le, M.DRosemead, CA · No drug or device payments recorded (2025) ·
(626) 757-1494 Dr. Gurinderjit Kanwar, M.D.Rosev, CA · No drug or device payments recorded (2025) ·
(914) 774-8300 Dr. Afsheen Azmat, MDRoseville, CA · No drug or device payments recorded (2025) ·
(855) 771-0335 Dr. Afshin Arya, M.D.Roseville, CA · No drug or device payments recorded (2025) ·
(916) 781-1927 Dr. Alexandramary Kelada, DO, MPHRoseville, CA · $1,788 in drug and device payments (2025) · Telehealth ·
(916) 786-4700 Dr. Ali Banisad, MDRoseville, CA · $23 in drug and device payments (2025) · Telehealth ·
(916) 789-1505 Dr. Amandeep Sandher, M.D.Roseville, CA · No drug or device payments recorded (2025) ·
(916) 784-4000 Dr. Anjali Dixit, MDRoseville, CA · $102 in drug and device payments (2025) ·
(916) 781-1787 Dr. Anthony Fu, MDRoseville, CA · No drug or device payments recorded (2025) · Telehealth ·
(916) 784-4000 Dr. Arshia Islam, MDRoseville, CA · No drug or device payments recorded (2025) ·
(916) 784-4000 Dr. Ashish Tandon, M.D.Roseville, CA · No drug or device payments recorded (2025) ·
(916) 781-1927 Dr. Baljinder Gill, MDRoseville, CA · $248 in drug and device payments (2025) ·
(916) 789-8620 Dr. Barbara Febbo-wilson, M.D.Roseville, CA · $111 in drug and device payments (2025) ·
(916) 783-7109 Dr. Barry Zeitlin, M.D.Roseville, CA · No drug or device payments recorded (2025) ·
(916) 783-7109 Dr. Beheshteh Nakhaee, M.DRoseville, CA · No drug or device payments recorded (2025) ·
(916) 781-1927 Dr. Benjamin Angelo Quiamco, M.D.Roseville, CA · $231 in drug and device payments (2025) ·
(916) 781-1927 Dr. Benjamin Palmer, D.O.Roseville, CA · No drug or device payments recorded (2025) ·
(916) 781-1927 Dr. Beverly Calkins, MDRoseville, CA · $508 in drug and device payments (2025) · Telehealth ·
(916) 666-7215 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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