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. Parminder Virdi, MDVisalia, CA · No drug or device payments recorded (2025) ·
(559) 737-4904 Dr. Rajinderpal ChahalVisalia, CA · $1,036 in drug and device payments (2025) · Telehealth ·
(559) 735-3881 Dr. Sana Afreen Ansari, M.D.Visalia, CA · $190 in drug and device payments (2025) ·
(559) 741-4500 Dr. Sandy SmithVisalia, CA · No drug or device payments recorded (2025) ·
(559) 625-6028 Dr. Saujan Devkota, MDVisalia, CA · No drug or device payments recorded (2025) ·
(877) 960-3426 Dr. Sharmineh Shams, M.D.Visalia, CA · $132 in drug and device payments (2025) ·
(559) 738-7500 Dr. Shreya Jain, M.D.Visalia, CA · $497 in drug and device payments (2025) ·
(559) 624-2000 Dr. Shyam Bhaskar, MDVisalia, CA · $877 in drug and device payments (2025) · Telehealth ·
(559) 635-7100 Dr. Surendra Sigdel, MDVisalia, CA · No drug or device payments recorded (2025) ·
(559) 624-2000 Dr. Thanit Hasadsri, M.D.Visalia, CA · No drug or device payments recorded (2025) ·
(559) 636-3459 Dr. Thi Thi Aye, M.D.Visalia, CA · No drug or device payments recorded (2025) ·
(559) 741-4500 Dr. Tracy UptonVisalia, CA · No drug or device payments recorded (2025) ·
(559) 624-2000 Dr. Tyler Ellis, MDVisalia, CA · No drug or device payments recorded (2025) ·
(559) 624-2001 Dr. Udayan Shah, MDVisalia, CA · No drug or device payments recorded (2025) ·
(559) 625-9100 Dr. Wally Huynh, MDVisalia, CA · No drug or device payments recorded (2025) ·
(559) 624-2200 Dr. Wei-tzuoh Chen, MDVisalia, CA · No drug or device payments recorded (2025) ·
(559) 732-4662 Dr. Abbas Sedaghat, M.D.Vista, CA · No drug or device payments recorded (2025) ·
(760) 631-5000 Dr. Ardeth Copeland, MDVista, CA · No drug or device payments recorded (2025) ·
(760) 631-5000 Dr. Arta ShirkhodaiVista, CA · $477 in drug and device payments (2025) · Telehealth ·
(760) 806-5820 Dr. Boris Polman, MDVista, CA · No drug or device payments recorded (2025) ·
(760) 631-5000 Dr. Christine Nguyen, MDVista, CA · $59 in drug and device payments (2025) · Telehealth ·
(800) 926-8273 Dr. Clark Bach, M.D.Vista, CA · $442 in drug and device payments (2025) · Telehealth ·
(760) 806-5500 Dr. David Wine, M.D.Vista, CA · $267 in drug and device payments (2025) · Telehealth ·
(760) 726-2180 Dr. Emad Abu-khieran, MDVista, CA · No drug or device payments recorded (2025) ·
(619) 205-4585 Dr. Ethan Nguyen, MDVista, CA · $151 in drug and device payments (2025) · Telehealth ·
(760) 941-9002 Dr. Galina Khemlina, MDVista, CA · No drug or device payments recorded (2025) ·
(858) 552-8585 Dr. Gary Kobayashi, M.D.Vista, CA · No drug or device payments recorded (2025) ·
(760) 630-5464 Dr. Gerald Ondash, MDVista, CA · No drug or device payments recorded (2025) ·
(760) 806-5820 Dr. Hai Le, MDVista, CA · No drug or device payments recorded (2025) ·
(760) 806-5560 Dr. Jennifer Black, M.D.Vista, CA · No drug or device payments recorded (2025) · Telehealth ·
(760) 631-5000 Dr. John Clancy, DOVista, CA · No drug or device payments recorded (2025) ·
(760) 305-1900 Dr. John Lafata, MDVista, CA · No drug or device payments recorded (2025) ·
(760) 726-2180 Dr. Kiran Mahl-sansone, M.D., INC.Vista, CA · No drug or device payments recorded (2025) ·
(760) 726-2180 Dr. Kristin Bell, M.D.Vista, CA · No drug or device payments recorded (2025) ·
(858) 552-8585 Dr. Mark O'brien, D.O.Vista, CA · $380 in drug and device payments (2025) · Telehealth ·
(760) 216-6500 Dr. Maryam Barangi, MDVista, CA · $421 in drug and device payments (2025) · Telehealth ·
(760) 291-6700 Dr. Mary Gimness, DOVista, CA · No drug or device payments recorded (2025) ·
(760) 806-5500 Dr. Max Chen, M.D.Vista, CA · No drug or device payments recorded (2025) ·
(760) 631-5000 Dr. Michael Macmurray, M.D. Dr. Michael Rutman, D.O.Vista, CA · $488 in drug and device payments (2025) · Telehealth ·
(760) 598-0088 Dr. Morris Wisniewski, M.D.Vista, CA · $503 in drug and device payments (2025) · Telehealth ·
(760) 726-2180 Dr. Prachi Patel, D.O.Vista, CA · No drug or device payments recorded (2025) ·
(303) 415-4157 Dr. Reza Yaghmai, MD, PHDVista, CA · No drug or device payments recorded (2025) ·
(760) 643-2000 Dr. Sam Baroudi, MDVista, CA · $293 in drug and device payments (2025) · Telehealth ·
(760) 940-7000 Dr. Sanjana Chaturvedi, MDVista, CA · $445 in drug and device payments (2025) · Telehealth ·
(760) 726-2180 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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