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. Linda Fresco, MDMenlo Park, CA · $146 in drug and device payments (2025) · Telehealth ·
(650) 498-6500 Dr. Lorna Thornton, MDMenlo Park, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 498-6500 Dr. Meena Ammani Swaminathan, MDMenlo Park, CA · $117 in drug and device payments (2025) ·
(650) 599-3890 Dr. Michael Jacobs, M.D.Menlo Park, CA · No drug or device payments recorded (2025) ·
(650) 325-9906 Dr. Nidhi Chaudhry, M.DMenlo Park, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 498-6500 Dr. Ping Fisher, MDMenlo Park, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 498-6500 Dr. Pushpasree Sajja, MDMenlo Park, CA · No drug or device payments recorded (2025) ·
(303) 809-8983 Dr. Rex Chiu, MDMenlo Park, CA · $125 in drug and device payments (2025) ·
(650) 815-9577 Dr. Richard Bowes, M.D.Menlo Park, CA · No drug or device payments recorded (2025) ·
(707) 628-9214 Dr. Sadick Alsadir, MDMenlo Park, CA · No drug or device payments recorded (2025) ·
(650) 599-3890 Dr. Sara Bunting, MDMenlo Park, CA · No drug or device payments recorded (2025) ·
(650) 815-9577 Dr. Sarah Watson, MDMenlo Park, CA · $108 in drug and device payments (2025) ·
(650) 498-6500 Dr. Scott Wood, M.D.Menlo Park, CA · No drug or device payments recorded (2025) ·
(650) 325-9955 Dr. Seth Weissman, MDMenlo Park, CA · $222 in drug and device payments (2025) ·
(650) 325-9906 Dr. Soa Tsung, MDMenlo Park, CA · $76 in drug and device payments (2025) ·
(650) 327-3000 Dr. Stacy Porter, MDMenlo Park, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 498-7080 Dr. Susan Garay, MDMenlo Park, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 498-4423 Dr. Thomas Fiene, M.D.Menlo Park, CA · No drug or device payments recorded (2025) ·
(650) 724-8000 Dr. Tiffany Ly, M.D.Menlo Park, CA · No drug or device payments recorded (2025) ·
(650) 815-9577 Dr. Victoria Chen, MDMenlo Park, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 498-6500 Dr. Yumi Ando, M.D.Menlo Park, CA · $15 in drug and device payments (2025) ·
(650) 530-2719 Dr. Gloria Jean Malabed-veronaMerced, CA · $233 in drug and device payments (2025) · Telehealth ·
(209) 384-4400 Dr. Henry Lam, M.D.Merced, CA · No drug or device payments recorded (2025) ·
(209) 722-3924 Dr. Jaideep Misra, MDMerced, CA · No drug or device payments recorded (2025) ·
(866) 682-4842 Dr. Jelili Apalara, MD, MPH, FACP, CPHQ.Merced, CA · No drug or device payments recorded (2025) ·
(516) 998-6037 Dr. Lekshmi Vallyathan, MDMerced, CA · No drug or device payments recorded (2025) ·
(209) 564-3713 Dr. Leland Fife, MDMerced, CA · No drug or device payments recorded (2025) ·
(209) 383-3381 Dr. Maristela Carreon, M.D.Merced, CA · $227 in drug and device payments (2025) · Telehealth ·
(209) 384-9108 Dr. Mark Altchek, M.D.Merced, CA · No drug or device payments recorded (2025) ·
(209) 725-1060 Dr. Michelle Barbosa, D.O.Merced, CA · No drug or device payments recorded (2025) · Telehealth ·
(209) 564-3500 Dr. Satnam Uppal, M.DMerced, CA · No drug or device payments recorded (2025) ·
(209) 722-8047 Dr. Sukhdip Kang, MDMerced, CA · No drug or device payments recorded (2025) ·
(209) 385-5600 Dr. Teresita Enad, M.D.Merced, CA · No drug or device payments recorded (2025) ·
(209) 384-9108 Dr. Nam Le, D.O.Midway City, CA · $124 in drug and device payments (2025) ·
(909) 838-0679 Dr. Andrew Ng, MDMillbrae, CA · No drug or device payments recorded (2025) ·
(650) 732-9721 Dr. Jie LingMillbrae, CA · $2,221 in drug and device payments (2025) · Telehealth ·
(650) 651-7175 Dr. Melissa Frederick, M.D.Millbrae, CA · No drug or device payments recorded (2025) ·
(650) 732-9721 Dr. Alison Lavoy, M.D.Mill Valley, CA · No drug or device payments recorded (2025) ·
(415) 383-6623 Dr. Cynthia Fenton, M.D.Mill Valley, CA · No drug or device payments recorded (2025) · Telehealth ·
(415) 300-6226 Dr. David Kirn, MDMill Valley, CA · No drug or device payments recorded (2025) ·
(415) 847-7326 Dr. Deanna GreenMill Valley, CA · No drug or device payments recorded (2025) ·
(415) 795-7000 Dr. Douglas Cohen, M.D.Mill Valley, CA · $192 in drug and device payments (2025) · Telehealth ·
(415) 968-1888 Dr. Elliot Liff, M.D.Mill Valley, CA · No drug or device payments recorded (2025) ·
(415) 383-5793 Dr. Gillian Lee, MDMill Valley, CA · No drug or device payments recorded (2025) ·
(415) 388-8400 Dr. Grace Dammann, M.D.Mill Valley, CA · No drug or device payments recorded (2025) ·
(415) 383-6623 Dr. Holly Batterman, M.D.Mill Valley, CA · No drug or device payments recorded (2025) ·
(415) 383-6623 Dr. Irene Teper, M.D.Mill Valley, CA · $192 in drug and device payments (2025) · Telehealth ·
(415) 212-8332 Dr. Justin Mager, M.D.Mill Valley, CA · No drug or device payments recorded (2025) ·
(415) 730-4235 Dr. Kathy Chang-lipsenthal, MDMill Valley, CA · No drug or device payments recorded (2025) · Telehealth ·
(888) 663-6331 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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