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. Rosemary Hernandez, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Rudolph Oehm, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-7420 Dr. Russell Ellyson, DOOakland, CA · No drug or device payments recorded (2025) ·
(510) 437-4141 Dr. Russell Silverstein, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Ryan Rivera, D.O.Oakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1190 Dr. Safa Magid, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Salman Ahmad, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 437-5039 Dr. Saly Sisouvong, M.D.Oakland, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 752-1000 Dr. Samaneh BolourchiOakland, CA · No drug or device payments recorded (2025) ·
(510) 915-0079 Dr. Samantha Ho, DO, MPHOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Samuel Dong, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 419-0230 Dr. Sandra Weatherby, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Sarah Parsons, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Sarah Piper, M.D.Oakland, CA · No drug or device payments recorded (2025) ·
(510) 752-4091 Dr. Sara Obeid, MD, MPHOakland, CA · No drug or device payments recorded (2025) ·
(510) 437-5039 Dr. Sara Rotner, M.D.Oakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Scott Lynch, M.D.Oakland, CA · No drug or device payments recorded (2025) ·
(510) 437-4141 Dr. Scott Peerenboom, D.O.Oakland, CA · $182 in drug and device payments (2025) · Telehealth ·
(510) 452-4824 Dr. Sein Aye, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Shamila Rahim, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Shawn Mattison, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Sheira Freedman, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 437-4323 Dr. Shelley XuOakland, CA · No drug or device payments recorded (2025) ·
(510) 655-4000 Dr. Shilpa Patel, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Shima Dadashzadeh, DOOakland, CA · No drug or device payments recorded (2025) ·
(408) 809-6654 Dr. Shing Chan, MDOakland, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 752-1000 Dr. Shirley Tucker-harris, M.D.Oakland, CA · $135 in drug and device payments (2025) · Telehealth ·
(510) 204-8290 Dr. Shruti Gandhi, MDOakland, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 752-1000 Dr. Sing Tan, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 533-9422 Dr. Stacy Shoshan, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-5220 Dr. Stanley Fong, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Stephanie Christenson, MDOakland, CA · $91,791 in drug and device payments (2025) · Telehealth ·
(510) 752-1000 Dr. Stephan Lee, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Stephen Chen, M.D.Oakland, CA · $158 in drug and device payments (2025) ·
(510) 625-6262 Dr. Stephen Hawkins, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Stephen Knox, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 628-0949 Dr. Stephen O'brien, M.D.Oakland, CA · No drug or device payments recorded (2025) ·
(510) 869-8400 Dr. Stewart Fong, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 318-5800 Dr. Sunita Mistry, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 437-4323 Dr. Sunitha Kandavara, M.D.Oakland, CA · No drug or device payments recorded (2025) ·
(408) 910-4252 Dr. Susan Fernyak, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 587-3000 Dr. Susan Lu, MDOakland, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 465-6700 Dr. Susan Mei Huang, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 986-6830 Dr. Susan Villa, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Swapna Merupula, M.B.,B.S.Oakland, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 204-8290 Dr. Tal Ziv, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Tamina Isolani-nagarvala, D.O.Oakland, CA · No drug or device payments recorded (2025) ·
(510) 437-4800 Dr. Tamsin Levy, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 437-4030 Dr. Tanny TantiyavarongOakland, CA · No drug or device payments recorded (2025) ·
(510) 437-4141 Dr. Ted Tsukayama, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 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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