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. Dalvinder Dhillon, MDOakland, CA · $152 in drug and device payments (2025) ·
(510) 752-1000 Dr. Daniela Kim, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 986-6830 Dr. Daniel Georgie, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 437-4800 Dr. Daniel Korn, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Daveena Ma, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 986-6800 Dr. Davida Flattery, D.O.Oakland, CA · No drug or device payments recorded (2025) ·
(510) 437-4800 Dr. David Bliss, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 987-1000 Dr. David Moskowitz, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 437-4884 Dr. David Tian, M.D.Oakland, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 437-5039 Dr. Deenu MaharjanOakland, CA · No drug or device payments recorded (2025) ·
(669) 900-2645 Dr. Denise Fuson, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Dennis Huynh, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Dennis Ing, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 908-2513 Dr. Diana Sweet, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Diana Sylvestre, M.D.Oakland, CA · No drug or device payments recorded (2025) ·
(510) 834-5442 Dr. Diego Fernandez, M.D.Oakland, CA · No drug or device payments recorded (2025) ·
(510) 869-6883 Dr. Dipankar Ghosh, DOOakland, CA · No drug or device payments recorded (2025) ·
(707) 373-4585 Dr. Divya Laxmikant, M.DOakland, CA · No drug or device payments recorded (2025) ·
(408) 718-4738 Dr. Donna Abare, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Douglas Chartier, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Douglas Epperson, MDOakland, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 752-1000 Dr. Edgar AsiimweOakland, CA · No drug or device payments recorded (2025) · Telehealth ·
(888) 663-6331 Dr. Eduardo Guillen, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 437-5039 Dr. Edward Cohen, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Eileen Gaspar, M.D.Oakland, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 752-7867 Dr. Eileen Kim, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Elaina Guerin, D.O.Oakland, CA · No drug or device payments recorded (2025) ·
(510) 535-7540 Dr. Elijah Lustig, DOOakland, CA · No drug or device payments recorded (2025) ·
(510) 384-9737 Dr. Elizabeth Vassallo-deluca, M.D.Oakland, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 752-1190 Dr. Eliza Chin, MDOakland, CA · $5,905 in drug and device payments (2025) ·
(510) 891-8519 Dr. Emily Park, MDOakland, CA · $124 in drug and device payments (2025) ·
(510) 869-8751 Dr. Erica Sobel, DOOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-5220 Dr. Eric Lipsitt, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Esme Cullen, MD, MPHOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Esteban Lovato, M.D.Oakland, CA · $300 in drug and device payments (2025) ·
(510) 261-1677 Dr. Eugene Mcmillan, M.D.Oakland, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 869-6883 Dr. Eva Thomas, MDOakland, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 752-1000 Dr. Everett Hsu, MDOakland, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 752-1000 Dr. Faranak Herrera, D.O.Oakland, CA · No drug or device payments recorded (2025) ·
(510) 437-4800 Dr. Farrell Barnett, M.D.Oakland, CA · No drug or device payments recorded (2025) ·
(510) 304-6045 Dr. Farzad Masroor, MDOakland, CA · $227 in drug and device payments (2025) ·
(510) 752-1115 Dr. Filip Kaniski, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 437-4800 Dr. Florence Myint-dun, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Florence Tso, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Francisco Isolani, M.D.Oakland, CA · No drug or device payments recorded (2025) ·
(510) 535-7573 Dr. Francis Wright, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Fredrick Kleinsinger, 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.
Related reading on HealthcareDiscovery.AI
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