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. Stanislaw Bankowski, MDVista, CA · $43 in drug and device payments (2025) · Telehealth ·
(800) 926-8273 Dr. Stuart Bursten, M.D.Vista, CA · No drug or device payments recorded (2025) ·
(760) 941-8888 Dr. Terry Haas, M.D.Vista, CA · No drug or device payments recorded (2025) ·
(760) 630-5464 Dr. Theresa Clark, MDVista, CA · No drug or device payments recorded (2025) ·
(760) 726-2180 Dr. Wendy Shumate, M.D.Vista, CA · No drug or device payments recorded (2025) ·
(760) 630-4715 Dr. William Weissman, MDVista, CA · No drug or device payments recorded (2025) ·
(760) 631-5000 Dr. Xiangli Li, M.D. PH.D., PCVista, CA · $1,896 in drug and device payments (2025) · Telehealth ·
(760) 941-9844 Dr. Ankush Sharma, MDWalnut, CA · $2,119 in drug and device payments (2025) · Telehealth ·
(213) 709-3930 Dr. Ann Walker, MDWalnut, CA · No drug or device payments recorded (2025) ·
(909) 594-5611 Dr. Ali-reza Barmaki, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3393 Dr. Amrita Dhaliwal, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Amy Clouse, MDWalnut Creek, CA · $28 in drug and device payments (2025) ·
(925) 947-3393 Dr. Andrea Lim, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Andrew Chang, MDWalnut Creek, CA · $43 in drug and device payments (2025) · Telehealth ·
(925) 295-4000 Dr. Andrew Leavitt, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 906-2000 Dr. Anish Patel, M.D.Walnut Creek, CA · $26 in drug and device payments (2025) ·
(925) 295-4000 Dr. Anita Patel, MDWalnut Creek, CA · $81 in drug and device payments (2025) ·
(925) 952-2888 Dr. Anne Gartner, DOWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 352-8720 Dr. Anthony Arroyo, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Anthony Bernens, MDWalnut Creek, CA · $288 in drug and device payments (2025) · Telehealth ·
(925) 952-5545 Dr. Anusha Bakshi, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3312 Dr. Ari Katz, M.D.Walnut Creek, CA · $45 in drug and device payments (2025) ·
(925) 296-9228 Dr. Aysha Ayub, DOWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 737-3798 Dr. Baldomero De Leon, M.D.Walnut Creek, CA · $560 in drug and device payments (2025) ·
(925) 932-1018 Dr. Barry Rotman, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 296-9228 Dr. Bibanjeet Virk, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3393 Dr. Brian O'connor, M.D., MPHWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3312 Dr. Calvin Deng, MDWalnut Creek, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 906-2000 Dr. Celso Taborga, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 946-1080 Dr. Chanda Banwat, M.D.Walnut Creek, CA · $954 in drug and device payments (2025) · Telehealth ·
(925) 296-9730 Dr. Charles Fang, MDWalnut Creek, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 295-4000 Dr. Christian Balzer, M.D.Walnut Creek, CA · $23 in drug and device payments (2025) ·
(925) 947-3393 Dr. Chun Ouyang, M.D., PH.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4020 Dr. Colleen Landry, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 906-2000 Dr. Dale Grahn, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Daniel Young, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. David Clemons, MDWalnut Creek, CA · $591 in drug and device payments (2025) · Telehealth ·
(925) 296-9756 Dr. David NathansonWalnut Creek, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 906-2000 Dr. Deborah Arce, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 952-2739 Dr. Deborah Doberne, MDWalnut Creek, CA · $42 in drug and device payments (2025) ·
(925) 295-4000 Dr. Delia Salgado-lejano, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 952-2888 Dr. Devorah Ben-zeev, M.D.Walnut Creek, CA · $680 in drug and device payments (2025) · Telehealth ·
(925) 296-9720 Dr. Douglas Zlock, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 296-9740 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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