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. Susan Shiells, MDFolsom, CA · No drug or device payments recorded (2025) ·
(916) 817-5000 Dr. Tet Toe, MDFolsom, CA · $2,202 in drug and device payments (2025) ·
(916) 542-1458 Dr. Thong Tram, D.O.Folsom, CA · $1,267 in drug and device payments (2025) · Telehealth ·
(916) 984-4948 Dr. Wali Danesh, M.D.Folsom, CA · $327 in drug and device payments (2025) · Telehealth ·
(916) 984-6100 Dr. Abbid Shah, M.D.Fontana, CA · No drug or device payments recorded (2025) ·
(833) 574-2273 Dr. Alex Quan, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Andrew ChenFontana, CA · No drug or device payments recorded (2025) ·
(909) 823-5220 Dr. Arash Faghieh, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Ariba DadabhoyFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-5339 Dr. Arman Aryai, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Asha Sharma, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Ashley Alexander, D.O.Fontana, CA · No drug or device payments recorded (2025) ·
(909) 427-5000 Dr. Azra Syed, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-2024 Dr. Bates Moses, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Bertrand Vipond, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Brandon Tong, D.O.Fontana, CA · $520 in drug and device payments (2025) · Telehealth ·
(909) 429-2864 Dr. Brenda Pelayo, DOFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-2608 Dr. Charerntas Toochinda, MDFontana, CA · No drug or device payments recorded (2025) · Telehealth ·
(909) 427-3910 Dr. Chithraleka Sundaramurthy, M.DFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-7132 Dr. Christine Bui, D.OFontana, CA · $239 in drug and device payments (2025) ·
(888) 750-0036 Dr. Cliff Hwang, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Danish Abbas, M.D.Fontana, CA · No drug or device payments recorded (2025) ·
(909) 427-2608 Dr. Darpan Patel, D.O.Fontana, CA · No drug or device payments recorded (2025) ·
(909) 302-4500 Dr. David Liu, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Dean Huynh, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Dennis Nagel, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Derek Leung, M.D.Fontana, CA · No drug or device payments recorded (2025) ·
(909) 427-5000 Dr. Dorcas Ang, MDFontana, CA · No drug or device payments recorded (2025) · Telehealth ·
(909) 427-3910 Dr. Duane Collins, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Duc Nguyen, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Edmond Hui, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Edward Im, MDFontana, CA · No drug or device payments recorded (2025) · Telehealth ·
(909) 427-3910 Dr. Elnaz Rakhshan, M.DFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-5000 Dr. Faramarz Alav, M.D.Fontana, CA · $420 in drug and device payments (2025) · Telehealth ·
(909) 429-2404 Dr. Floyd Andersen, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Francis Jang, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Fred Lai, M.D.Fontana, CA · No drug or device payments recorded (2025) ·
(909) 706-1562 Dr. Gary Dibble, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Gary Wong, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Gregory Shimizu, MDFontana, CA · $102 in drug and device payments (2025) ·
(909) 427-3910 Dr. Hanieh Sadat Tabatabaei YeganehFontana, CA · No drug or device payments recorded (2025) ·
(833) 574-2273 Dr. Henry Sideropoulos, Md, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 609-3501 Dr. Hermina Verde, M.D.Fontana, CA · No drug or device payments recorded (2025) ·
(909) 822-1164 Dr. Hollis Lee, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 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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