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. Aranzazu Briseno Rodriguez, MDPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 559-7500 Dr. Charles Metzger, MDPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 765-3900 Dr. Gerald Besses, MDPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 658-2799 Dr. Karen Bloom, MDPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 765-3900 Dr. Kokeb Teshome, M.D.Petaluma, CA · $65 in drug and device payments (2025) ·
(707) 778-1111 Dr. Lisa Velasquez, MDPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 765-3900 Dr. Louis Pelfini, MDPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 766-1580 Dr. Luke Raudaskoski, DOPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 765-3900 Dr. Michael Lennon, MDPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 953-6587 Dr. Nina Molin, MDPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 559-7500 Dr. Padma Aluru, MDPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 778-1111 Dr. Philippe Edouard, MDPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 559-7500 Dr. Rajesh Ranadive, MDPetaluma, CA · $117 in drug and device payments (2025) ·
(707) 763-0802 Dr. Rajina Ranadive, MDPetaluma, CA · $445 in drug and device payments (2025) · Telehealth ·
(707) 763-9891 Dr. Roberto Gonzalez, MDPetaluma, CA · $22 in drug and device payments (2025) · Telehealth ·
(707) 765-3900 Dr. Roberto Gonzalez Huerta, MDPetaluma, CA · $27 in drug and device payments (2025) · Telehealth ·
(707) 308-2840 Dr. Robert Ostroff, M.D.Petaluma, CA · No drug or device payments recorded (2025) ·
(707) 778-1111 Dr. Rukiye Yoltar, MDPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 765-3900 Dr. Saw Aye, M.DPetaluma, CA · No drug or device payments recorded (2025) · Telehealth ·
(707) 782-9123 Dr. Sharina Belani, MDPetaluma, CA · $174 in drug and device payments (2025) ·
(707) 765-3900 Dr. Stephen Weiss, MDPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 765-3900 Dr. Susan Gross, MDPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 765-3900 Dr. Thomas Maloney, MDPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 763-6585 Dr. Dagmara Olsen, MDPico Rivera, CA · $47 in drug and device payments (2025) ·
(562) 445-3181 Dr. David Ding, MDPico Rivera, CA · $135 in drug and device payments (2025) ·
(562) 205-4200 Dr. Gemma Ko, M.D.Pico Rivera, CA · $336 in drug and device payments (2025) · Telehealth ·
(562) 692-3388 Dr. Khalid Nur, M.D.Pico Rivera, CA · $228 in drug and device payments (2025) · Telehealth ·
(562) 692-3388 Dr. Lam Nguyen, M.D.Pico Rivera, CA · No drug or device payments recorded (2025) ·
(562) 205-4200 Dr. Parveen Ahmed, M.D.Pico Rivera, CA · $635 in drug and device payments (2025) ·
(562) 695-2282 Dr. Anita Gaind, MDPinole, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 724-9110 Dr. James Naughton, M.D.Pinole, CA · No drug or device payments recorded (2025) ·
(510) 724-9110 Dr. Rekha Murali, M.D.Pinole, CA · No drug or device payments recorded (2025) ·
(510) 724-6712 Dr. Richard Batts, M.D.Pinole, CA · No drug or device payments recorded (2025) ·
(510) 724-9110 Dr. Richard Sankary, M.D.Pinole, CA · No drug or device payments recorded (2025) ·
(510) 724-9110 Dr. Zygy Roe-zurz, MDPinole, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 237-2802 Dr. Alice Wallack, MDPismo Beach, CA · No drug or device payments recorded (2025) ·
(805) 474-2600 Dr. Cu Nguyen, MDPismo Beach, CA · No drug or device payments recorded (2025) ·
(805) 474-8450 Dr. David Bernhardt, M.D.Pismo Beach, CA · No drug or device payments recorded (2025) ·
(805) 474-8450 Dr. Kathleen ChakPismo Beach, CA · $67 in drug and device payments (2025) · Telehealth ·
(805) 474-8450 Dr. K. George Sachariah, MDPismo Beach, CA · No drug or device payments recorded (2025) ·
(805) 489-2205 Dr. Mary Lowery, MDPismo Beach, CA · No drug or device payments recorded (2025) ·
(805) 474-2600 Dr. Megan Malzone, MDPismo Beach, CA · No drug or device payments recorded (2025) · Telehealth ·
(805) 474-2600 Dr. Dong Hoon Lee, M.D.Pittsburg, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 432-3318 Dr. Galicano Andal, M.D.Pittsburg, CA · $68 in drug and device payments (2025) · Telehealth ·
(925) 493-3334 Dr. John Gallo, DOPittsburg, CA · $32 in drug and device payments (2025) ·
(925) 432-3318 Dr. Juan Sequeira, M.D.Pittsburg, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 753-1986 Dr. Kate Christensen, MDPittsburg, CA · No drug or device payments recorded (2025) ·
(925) 431-2100 Dr. Michael Russell, M.D.Pittsburg, CA · No drug or device payments recorded (2025) ·
(925) 432-3318 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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