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. Shirin SadriStanford, CA · $148 in drug and device payments (2025) ·
(650) 723-6661 Dr. Shirley Park, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-9363 Dr. Shivam Vedak, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Shreya Shah, MDStanford, CA · $38 in drug and device payments (2025) · Telehealth ·
(650) 723-6661 Dr. Shushma Gudla, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Silvia Loica-mersa, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-6661 Dr. Spencer Chang, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Stefan Torelli, MDStanford, CA · $1,598 in drug and device payments (2025) ·
(650) 723-6661 Dr. Stephanie Harman, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Stephanie Kim, MD, PHDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Stephanie Wang, MDStanford, CA · $27 in drug and device payments (2025) ·
(650) 723-4000 Dr. Stephen Luby, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4129 Dr. Stephen Ma, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Steven Doerstling, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Steven Soo, MDStanford, CA · $105 in drug and device payments (2025) ·
(650) 723-4000 Dr. Sulaiman Somani, MDStanford, CA · $136 in drug and device payments (2025) ·
(650) 723-4000 Dr. Sumbul Desai, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Susan Benedick, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Susanna Miao, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Susan Ripper, M.D.Stanford, CA · $4,518 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Swati Didonato, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Swati Tole, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-2217 Dr. Terrence Blaschke, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 725-4632 Dr. Theresa Greco, MDStanford, CA · $46 in drug and device payments (2025) ·
(650) 723-4000 Dr. Thomas Lew, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Thomas Zikos, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-6661 Dr. Thuy Pham, M.D.Stanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Tia Cheunkarndee, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-6661 Dr. Tiffany Leung, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Tobias Dong, MD, PHDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Uttara Gadde, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Vanessa Nunez, MD MBAStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-5948 Dr. Varalakshmi Niranjan, MDStanford, CA · $65 in drug and device payments (2025) · Telehealth ·
(650) 423-4000 Dr. Vatsal Shah, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Vigneshwar Subramanian, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Vijayalakshmi Brahmashettar, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Vishnu Nair, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Vishnu Ravi, MDStanford, CA · $76 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Weihan Chu, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Wendy Caceres, M.D.Stanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. William Clusin, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-7395 Dr. William Collins, M.D.Stanford, CA · $25 in drug and device payments (2025) ·
(650) 723-4000 Dr. William Frederick, MD, PHDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Wilson Kuswanto, M.D. PHDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-6661 Dr. Winifred Teuteberg, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Xiaolin Jia, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Xiao Yan Wang, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-6028 Dr. Xue Ying Hwang, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Yingchao Zhong, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Zachary GrayStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 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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