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. Min-shong Chang, MDHayward, CA · No drug or device payments recorded (2025) ·
(510) 782-1972 Dr. Mohit JoshipuraHayward, CA · No drug or device payments recorded (2025) ·
(833) 860-1057 Dr. Neil Handelman, MDHayward, CA · No drug or device payments recorded (2025) ·
(510) 784-4000 Dr. Queelan Ratnesar, M.D.Hayward, CA · No drug or device payments recorded (2025) ·
(510) 783-6444 Dr. Robert Lake, M.D.Hayward, CA · No drug or device payments recorded (2025) ·
(510) 266-1700 Dr. Ronald Banks, MDHayward, CA · No drug or device payments recorded (2025) ·
(510) 538-9909 Dr. Soma Mandal, MDHayward, CA · No drug or device payments recorded (2025) ·
(510) 784-4000 Dr. Srilekha Puranam, M.D.Hayward, CA · No drug or device payments recorded (2025) ·
(510) 266-1741 Dr. Steven Verbinski, M.D. Dr. Sylusha Gadipudi, MDHayward, CA · No drug or device payments recorded (2025) ·
(510) 670-1111 Dr. Thomas Fung, M.D.Hayward, CA · No drug or device payments recorded (2025) ·
(510) 886-6111 Dr. Tong-hau Wu, MDHayward, CA · No drug or device payments recorded (2025) ·
(510) 784-4000 Dr. Victor Chu, MDHayward, CA · No drug or device payments recorded (2025) ·
(510) 784-4000 Dr. Xiaochuan Chen, M.D.Hayward, CA · $137 in drug and device payments (2025) · Telehealth ·
(510) 403-1699 Dr. Yogesh Bhakta, MDHayward, CA · No drug or device payments recorded (2025) ·
(510) 784-4000 Dr. David Anderson, MDHealdsburg, CA · No drug or device payments recorded (2025) ·
(707) 433-3383 Dr. Jonathan Albeg, MDHealdsburg, CA · No drug or device payments recorded (2025) ·
(707) 433-7258 Dr. Jonathan Kaiser, MDHealdsburg, CA · No drug or device payments recorded (2025) ·
(415) 246-9043 Dr. Jose Chibras Sainz, MDHealdsburg, CA · No drug or device payments recorded (2025) ·
(707) 385-2311 Dr. Melanie Kates, MDHealdsburg, CA · No drug or device payments recorded (2025) ·
(707) 433-7258 Dr. Patricia Dahl, M.D.Healdsburg, CA · No drug or device payments recorded (2025) ·
(707) 433-7258 Dr. Paul MarguglioHealdsburg, CA · No drug or device payments recorded (2025) ·
(707) 433-3383 Dr. Richard Ganz, M.D.Healdsburg, CA · No drug or device payments recorded (2025) ·
(707) 433-8817 Dr. Sally Masters, M.D.Healdsburg, CA · No drug or device payments recorded (2025) ·
(707) 433-7214 Dr. Sandra GoveHealdsburg, CA · No drug or device payments recorded (2025) ·
(415) 658-1677 Dr. Thea Drayer, MDHealdsburg, CA · No drug or device payments recorded (2025) ·
(707) 433-3383 Dr. Thomas Toth, MDHealdsburg, CA · No drug or device payments recorded (2025) ·
(707) 433-5494 Dr. Tony Veletto, M.D.Healdsburg, CA · No drug or device payments recorded (2025) ·
(707) 433-3383 Dr. Abid Hussain, MDHemet, CA · $1,390 in drug and device payments (2025) ·
(951) 652-0060 Dr. Afeefa Konchwalla, MD Dr. Arvind Mathur, MDHemet, CA · $48 in drug and device payments (2025) · Telehealth ·
(951) 925-6625 Dr. Benson Eghreriniovo, MD Dr. Casey Corsino, D.O.Hemet, CA · No drug or device payments recorded (2025) ·
(951) 925-6625 Dr. Hemchand Kolli, M.DHemet, CA · $2,549 in drug and device payments (2025) · Telehealth ·
(951) 925-6625 Dr. Herman Mathias, M.DHemet, CA · $603 in drug and device payments (2025) · Telehealth ·
(951) 929-6003 Dr. Jimena Torres, MDHemet, CA · No drug or device payments recorded (2025) ·
(951) 600-4337 Dr. John Carvalho, M.B.B.S.Hemet, CA · No drug or device payments recorded (2025) ·
(951) 652-2811 Dr. Joungsen Hong, M.D.,F.A.C.G.Hemet, CA · No drug or device payments recorded (2025) ·
(951) 929-1177 Dr. Justin PartoviHemet, CA · No drug or device payments recorded (2025) ·
(951) 652-2811 Dr. Kamran Qureshi, M.D.Hemet, CA · $542 in drug and device payments (2025) · Telehealth ·
(951) 765-1023 Dr. Lauren Montes, MDHemet, CA · No drug or device payments recorded (2025) ·
(951) 599-8403 Dr. Manikanda Raja, M.D.Hemet, CA · $1,420 in drug and device payments (2025) ·
(951) 658-4486 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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