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. Tyler Ky, DOPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 721-5804 Dr. Vaijayanthy Rangarajan, MDPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 853-2977 Dr. Varsha Sathappan, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Veronica Yank, MDPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-6028 Dr. Veronika Sharp, M.D.Palo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-6961 Dr. Vineeta Agarwala, M.D.Palo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 498-9000 Dr. Vinita Shastri, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5000 Dr. Walter Wu, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 813-5659 Dr. William Cheng, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 321-4121 Dr. William Chu, M.D.Palo Alto, CA · $1,160 in drug and device payments (2025) ·
(650) 329-0440 Dr. Yeuen Kim, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 723-8222 Dr. Yinchong Mak, MDPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 321-4121 Dr. Daniel Alcala, MDPalo Cedro, CA · No drug or device payments recorded (2025) ·
(530) 243-1134 Dr. John Kofi Yeboah, MDPalos Verdes Estates, CA · No drug or device payments recorded (2025) ·
(310) 755-8414 Dr. Richard Helfant, MDPalos Verdes Estates, CA · No drug or device payments recorded (2025) ·
(310) 697-6781 Dr. Richard Lee, MDPalos Verdes Estates, CA · No drug or device payments recorded (2025) ·
(310) 780-0318 Dr. Adrian Rubin Jr., MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Adrian Yee, MDPanorama City, CA · No drug or device payments recorded (2025) · Telehealth ·
(818) 375-2000 Dr. Afshin Javaherian, MDPanorama City, CA · $294 in drug and device payments (2025) · Telehealth ·
(818) 375-2000 Dr. Alan Pollack, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Ann Vijums, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Anthony Echendu, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Arya Saleh, MDPanorama City, CA · No drug or device payments recorded (2025) · Telehealth ·
(818) 375-2000 Dr. Asaad Swissa, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Azita Azad, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Belonwu Okafor, MDPanorama City, CA · $33 in drug and device payments (2025) ·
(818) 904-3132 Dr. Cameron Yamaguchi, MDPanorama City, CA · No drug or device payments recorded (2025) · Telehealth ·
(818) 375-2000 Dr. Carrie Algozine, DOPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Chalit Vasnarungruengkul, M.D.Panorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-3753 Dr. Christopher Berberian, M.D.Panorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Christopher Cybulski, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Cyrus Lavian, M.D.Panorama City, CA · $36 in drug and device payments (2025) ·
(818) 830-9999 Dr. Daniel Nargizian, DOPanorama City, CA · No drug or device payments recorded (2025) · Telehealth ·
(818) 375-2000 Dr. David Blackham, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. David Buch, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. David Wong, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Deepal Ekanayake, MDPanorama City, CA · $21 in drug and device payments (2025) ·
(818) 375-2000 Dr. Dina Albaree, DOPanorama City, CA · No drug or device payments recorded (2025) ·
(833) 574-2273 Dr. Douglas Weese, MDPanorama City, CA · No drug or device payments recorded (2025) · Telehealth ·
(818) 375-2000 Dr. Edward Brosnan, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Elaine Zollner, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Elias Name, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Eric Ma, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Eugene Choi, M.D.Panorama City, CA · No drug or device payments recorded (2025) · Telehealth ·
(888) 778-5000 Dr. Evan Zhao, DOPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Gilbert Rosales, M.D.Panorama City, CA · $171 in drug and device payments (2025) ·
(818) 830-7751 Dr. Hermilito VillarPanorama City, CA · $165 in drug and device payments (2025) ·
(818) 830-6888 Dr. James Chou, MDPanorama City, CA · $300 in drug and device payments (2025) ·
(818) 375-2000 Dr. James Li, MDPanorama City, CA · No drug or device payments recorded (2025) · Telehealth ·
(818) 375-2000 Dr. James Nitahara, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 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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