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. Tyrone Bordenave, M.D.Inglewood, CA · No drug or device payments recorded (2025) ·
(310) 674-5353 Dr. Victoria Szatalowicz, M.D.Inglewood, CA · No drug or device payments recorded (2025) ·
(310) 419-8636 Dr. Christopher Smith, M.D.Ione, CA · No drug or device payments recorded (2025) ·
(209) 274-4911 Dr. Stephen Tseng, MDIone, CA · No drug or device payments recorded (2025) ·
(209) 274-4911 Dr. Wesley Hashimoto, M.D.Ione, CA · No drug or device payments recorded (2025) ·
(209) 274-4911 Dr. Adeela Ahsan, MDIrvine, CA · No drug or device payments recorded (2025) · Telehealth ·
(949) 552-1546 Dr. Ahsan Rashid, MDIrvine, CA · No drug or device payments recorded (2025) ·
(949) 753-1522 Dr. Albert Saisho, M.D.Irvine, CA · No drug or device payments recorded (2025) · Telehealth ·
(949) 262-0080 Dr. Alice Wong, MDIrvine, CA · No drug or device payments recorded (2025) ·
(949) 824-7010 Dr. Allan Sosin, MDIrvine, CA · No drug or device payments recorded (2025) ·
(949) 600-5100 Dr. Amanda Binns, M.D.Irvine, CA · No drug or device payments recorded (2025) · Telehealth ·
(949) 417-9820 Dr. Anderson VuIrvine, CA · No drug or device payments recorded (2025) ·
(833) 574-2273 Dr. Andrew Siskind, M.D.Irvine, CA · No drug or device payments recorded (2025) ·
(949) 732-3530 Dr. Ann Mai, MDIrvine, CA · $139 in drug and device payments (2025) · Telehealth ·
(949) 262-9700 Dr. Anthony Wong, MDIrvine, CA · $2,013 in drug and device payments (2025) · Telehealth ·
(949) 551-1090 Dr. Arezou Nazary, MDIrvine, CA · No drug or device payments recorded (2025) · Telehealth ·
(949) 791-3101 Dr. Bang Kim, M.D.Irvine, CA · $1,005 in drug and device payments (2025) · Telehealth ·
(949) 552-7002 Dr. Barbara Davis, D.O.Irvine, CA · No drug or device payments recorded (2025) ·
(855) 206-6764 Dr. Behdad Akbarpour, MDIrvine, CA · $5,541 in drug and device payments (2025) ·
(949) 725-0100 Dr. Benhoor Khalpari, M.D.Irvine, CA · No drug or device payments recorded (2025) ·
(855) 206-6764 Dr. Betsy Kuriakose, MDIrvine, CA · No drug or device payments recorded (2025) ·
(949) 923-3200 Dr. Billy Zhang, MDIrvine, CA · $295 in drug and device payments (2025) · Telehealth ·
(714) 263-9279 Dr. Bobby Sasson, M.D., M.P.H.Irvine, CA · No drug or device payments recorded (2025) · Telehealth ·
(512) 978-9000 Dr. Brent Silvers, M.D.Irvine, CA · No drug or device payments recorded (2025) ·
(949) 770-1122 Dr. Brian Lo, MDIrvine, CA · $19 in drug and device payments (2025) · Telehealth ·
(949) 503-5112 Dr. Chienwei Chen, MDIrvine, CA · $1,566 in drug and device payments (2025) · Telehealth ·
(949) 551-1090 Dr. Chit Su Wai, MDIrvine, CA · No drug or device payments recorded (2025) ·
(949) 923-3200 Dr. Christian Lu, MDIrvine, CA · $29 in drug and device payments (2025) · Telehealth ·
(855) 206-6764 Dr. Daniel Otterson, MDIrvine, CA · No drug or device payments recorded (2025) · Telehealth ·
(949) 824-8600 Dr. Dan Tran, MDIrvine, CA · $463 in drug and device payments (2025) · Telehealth ·
(949) 791-3101 Dr. Denny Lee, MDIrvine, CA · No drug or device payments recorded (2025) ·
(949) 753-1663 Dr. Duy Le, M.D.Irvine, CA · No drug or device payments recorded (2025) ·
(949) 932-5000 Dr. Edward Himes, MDIrvine, CA · No drug or device payments recorded (2025) ·
(949) 933-3200 Dr. Emad Mikhail, MDIrvine, CA · No drug or device payments recorded (2025) · Telehealth ·
(949) 653-5810 Dr. Erik Geiger, MDIrvine, CA · $29 in drug and device payments (2025) · Telehealth ·
(855) 206-6764 Dr. Farhad NajafiIrvine, CA · No drug or device payments recorded (2025) ·
(202) 288-6639 Dr. Farhad Nassiri Afshar, MDIrvine, CA · No drug or device payments recorded (2025) ·
(949) 776-9292 Dr. Farhan Ayoub, MDIrvine, CA · No drug or device payments recorded (2025) · Telehealth ·
(949) 791-3101 Dr. Farrokh Alemzadeh, MDIrvine, CA · No drug or device payments recorded (2025) · Telehealth ·
(949) 654-4325 Dr. Firas Naji, D.O.Irvine, CA · No drug or device payments recorded (2025) ·
(949) 981-5033 Dr. Francisco Perez, M.D. Dr. Gayathri Sadashiva Naik, M.D.Irvine, CA · No drug or device payments recorded (2025) · Telehealth ·
(949) 791-3101 Dr. Grace Lozinski, M.D.Irvine, CA · $119 in drug and device payments (2025) · Telehealth ·
(949) 262-9700 Dr. Han Vo, MDIrvine, CA · $933 in drug and device payments (2025) · Telehealth ·
(949) 551-1090 Dr. Henry Tsai, M.D.Irvine, CA · No drug or device payments recorded (2025) ·
(949) 824-5302 Dr. Hoa Nguyen, M.D.Irvine, CA · No drug or device payments recorded (2025) ·
(949) 393-7443 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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