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. Theodore Liang, MDHarbor City, CA · No drug or device payments recorded (2025) ·
(310) 325-5111 Dr. Thomas Pham, MDHarbor City, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 325-5111 Dr. Tomie Rogers, MDHarbor City, CA · No drug or device payments recorded (2025) ·
(310) 325-5111 Dr. Tracy Imley, MDHarbor City, CA · No drug or device payments recorded (2025) ·
(310) 325-5111 Dr. Veassa Johnson, M.DHarbor City, CA · No drug or device payments recorded (2025) ·
(424) 263-5260 Dr. Verna Guo, MDHarbor City, CA · No drug or device payments recorded (2025) ·
(310) 325-5111 Dr. Warren Hsiao, MDHarbor City, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 325-5111 Dr. William Fleury, MDHarbor City, CA · No drug or device payments recorded (2025) ·
(310) 325-5111 Dr. Zhuo Jia, MDHarbor City, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 325-5111 Dr. Alfonso Brigham, M.D.Hawthorne, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 792-4450 Dr. Augustine Iluore, MDHawthorne, CA · $145 in drug and device payments (2025) · Telehealth ·
(310) 219-2929 Dr. Bang Pham, M.D.Hawthorne, CA · No drug or device payments recorded (2025) ·
(310) 675-0395 Dr. Dat Nguyen, MDHawthorne, CA · $27 in drug and device payments (2025) · Telehealth ·
(310) 679-0269 Dr. Doris Ragland, MDHawthorne, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 263-5700 Dr. Jennifer Chiu, M.D.Hawthorne, CA · $38 in drug and device payments (2025) ·
(310) 645-0444 Dr. Kenneth Landis, M.D.Hawthorne, CA · No drug or device payments recorded (2025) ·
(310) 822-2255 Dr. Malay Das, MDHawthorne, CA · $15 in drug and device payments (2025) ·
(310) 219-0647 Dr. Mark Kim, M.D.Hawthorne, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 675-5370 Dr. Maziar Nabavi, M.D.Hawthorne, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 675-0395 Dr. Mehmet Demirozu, M.D.Hawthorne, CA · No drug or device payments recorded (2025) ·
(310) 644-9515 Dr. Moises Claudio-henriquezHawthorne, CA · $144 in drug and device payments (2025) · Telehealth ·
(310) 465-8479 Dr. Pooja Kumar, M.D.Hawthorne, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 675-4440 Dr. Rafik Shereen, MDHawthorne, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 643-8500 Dr. Raymond Jing, MDHawthorne, CA · No drug or device payments recorded (2025) ·
(310) 263-5700 Dr. Spencer Wenger, MDHawthorne, CA · No drug or device payments recorded (2025) ·
(310) 263-5700 Dr. Valentin Hernandez, M.D.Hawthorne, CA · $614 in drug and device payments (2025) ·
(310) 219-0941 Dr. Abubakr Asadulla, M.D.Hayward, CA · No drug or device payments recorded (2025) ·
(510) 784-4000 Dr. Adam Regelmann, MD, PHDHayward, CA · No drug or device payments recorded (2025) ·
(855) 782-7899 Dr. Aida Li, MDHayward, CA · No drug or device payments recorded (2025) ·
(510) 784-4000 Dr. Allen Chiu, MDHayward, CA · No drug or device payments recorded (2025) ·
(510) 784-4000 Dr. Anu Pokharel, MDHayward, CA · $290 in drug and device payments (2025) ·
(510) 398-7474 Dr. David Anderson, MDHayward, CA · No drug or device payments recorded (2025) ·
(510) 784-4000 Dr. Diane Sun, M.D.Hayward, CA · No drug or device payments recorded (2025) ·
(510) 454-1000 Dr. Emily Fisher, M.D.Hayward, CA · No drug or device payments recorded (2025) ·
(510) 266-1700 Dr. Eric Kohleriter, M.D.Hayward, CA · No drug or device payments recorded (2025) ·
(510) 785-5000 Dr. Generoso Porciuncula, M.D.Hayward, CA · No drug or device payments recorded (2025) ·
(510) 887-6956 Dr. Gerald Frank, MDHayward, CA · No drug or device payments recorded (2025) ·
(510) 784-4000 Dr. Gerald Myint, M.D.Hayward, CA · No drug or device payments recorded (2025) ·
(510) 670-1111 Dr. Glenda Lovell, MDHayward, CA · No drug or device payments recorded (2025) ·
(510) 471-5880 Dr. Houman Sharifi, M.DHayward, CA · $287 in drug and device payments (2025) · Telehealth ·
(510) 785-5000 Dr. Ivan Lee, M.D.Hayward, CA · No drug or device payments recorded (2025) ·
(510) 783-6444 Dr. Jean-paul Motamedi, DOHayward, CA · No drug or device payments recorded (2025) ·
(510) 784-4000 Dr. Jennifer Klein, M.D.Hayward, CA · No drug or device payments recorded (2025) ·
(510) 454-1000 Dr. John Bell, M.D.Hayward, CA · No drug or device payments recorded (2025) ·
(510) 780-4345 Dr. Jonas Masikat, M.DHayward, CA · No drug or device payments recorded (2025) ·
(510) 780-4345 Dr. Kaarel Kaljot, M.D.Hayward, CA · No drug or device payments recorded (2025) ·
(510) 785-5000 Dr. Maina Shetty, MDHayward, CA · No drug or device payments recorded (2025) ·
(510) 782-7111 Dr. Mark Khoo, MDHayward, CA · No drug or device payments recorded (2025) ·
(510) 885-3735 Dr. Michael Marchiano, MDHayward, CA · $371 in drug and device payments (2025) · Telehealth ·
(510) 670-1111 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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