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. Dozie Oparaugo, DOOroville, CA · No drug or device payments recorded (2025) ·
(530) 533-8500 Dr. Jacqueline Sanchez-mora, NPOroville, CA · No drug or device payments recorded (2025) ·
(530) 533-8500 Dr. Joan Harter, MDOroville, CA · $748 in drug and device payments (2025) ·
(530) 532-8687 Dr. John Parsons, M.D.Oroville, CA · No drug or device payments recorded (2025) ·
(530) 534-7500 Dr. Linda Lay, D.O.Oroville, CA · $18 in drug and device payments (2025) ·
(530) 533-8500 Dr. Matthew Fine, M.D.Oroville, CA · No drug or device payments recorded (2025) ·
(530) 532-8654 Dr. Narinder SinghOroville, CA · $144 in drug and device payments (2025) ·
(530) 533-6061 Dr. Norman Baron, M.D.Oroville, CA · No drug or device payments recorded (2025) ·
(530) 751-0850 Dr. Paul Lentz, MDOroville, CA · No drug or device payments recorded (2025) ·
(530) 534-3793 Dr. Phuc Tran, DOOroville, CA · No drug or device payments recorded (2025) ·
(530) 532-8648 Dr. Rhea Licuanan, M.D.Oroville, CA · No drug or device payments recorded (2025) ·
(530) 534-7500 Dr. Robert Abbott, DOOroville, CA · No drug or device payments recorded (2025) ·
(530) 533-8500 Dr. Roy Shannon, MDOroville, CA · No drug or device payments recorded (2025) ·
(530) 533-6061 Dr. Samuel Sanders, MDOroville, CA · $17 in drug and device payments (2025) ·
(530) 534-5394 Dr. Sidharth Bagga, MD, MBAOroville, CA · No drug or device payments recorded (2025) ·
(530) 533-8500 Dr. Thomas Mundorff, MDOroville, CA · No drug or device payments recorded (2025) ·
(530) 533-6061 Dr. Virgil Duvernay, MD, PHD, FACPOroville, CA · No drug or device payments recorded (2025) ·
(530) 712-2171 Dr. Ananda Ananda, M.D,Oxnard, CA · No drug or device payments recorded (2025) ·
(805) 984-0144 Dr. Anuradha Maganti, M.D.Oxnard, CA · No drug or device payments recorded (2025) ·
(805) 512-2777 Dr. Bernard Mcdermott, D.O.Oxnard, CA · No drug or device payments recorded (2025) ·
(805) 983-2234 Dr. Charles Avery, M.D.Oxnard, CA · No drug or device payments recorded (2025) ·
(805) 981-9111 Dr. Christopher Brana, M.D.Oxnard, CA · $1,694 in drug and device payments (2025) · Telehealth ·
(805) 983-0425 Dr. Dorothea Clayton, M.D.Oxnard, CA · $423 in drug and device payments (2025) · Telehealth ·
(805) 985-5505 Dr. Ginger Schechter, M.D.Oxnard, CA · No drug or device payments recorded (2025) ·
(805) 981-3770 Dr. Grace HunterOxnard, CA · No drug or device payments recorded (2025) ·
(802) 204-9520 Dr. Irina TuchinskyOxnard, CA · No drug or device payments recorded (2025) ·
(805) 988-2505 Dr. Jasjot Vermani, MDOxnard, CA · No drug or device payments recorded (2025) ·
(805) 988-2500 Dr. Jeffrey Kopstein, DOOxnard, CA · $21 in drug and device payments (2025) · Telehealth ·
(805) 988-2500 Dr. Jennifer Sisco, MDOxnard, CA · No drug or device payments recorded (2025) ·
(000) 000-0000 Dr. Liz Diaz-querol, MDOxnard, CA · No drug or device payments recorded (2025) ·
(888) 515-3500 Dr. Manuela Venturoni, MDOxnard, CA · No drug or device payments recorded (2025) ·
(805) 843-4248 Dr. Megan Mescher-cox, D.O.Oxnard, CA · $264 in drug and device payments (2025) · Telehealth ·
(805) 485-7877 Dr. Mohamud Qadi, MD, MPHOxnard, CA · No drug or device payments recorded (2025) ·
(805) 330-8680 Dr. Myo Min, M.DOxnard, CA · No drug or device payments recorded (2025) ·
(805) 988-2500 Dr. Paul Cisarik, MDOxnard, CA · $953 in drug and device payments (2025) · Telehealth ·
(805) 981-3770 Dr. Richard Brand, MDOxnard, CA · No drug or device payments recorded (2025) ·
(805) 983-0425 Dr. Richard Nguyen, M.D.Oxnard, CA · $102 in drug and device payments (2025) · Telehealth ·
(805) 485-9123 Dr. Robert Fell, M.D.Oxnard, CA · No drug or device payments recorded (2025) ·
(805) 988-2500 Dr. Romany Demian, M.D.Oxnard, CA · $1,004 in drug and device payments (2025) · Telehealth ·
(805) 483-2500 Dr. Rukmini Enjamuri, MDOxnard, CA · No drug or device payments recorded (2025) ·
(805) 983-0521 Dr. Scott Underwood, D.O.Oxnard, CA · $44 in drug and device payments (2025) · Telehealth ·
(805) 981-5151 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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