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. Eric Lim, M.D.Cerritos, CA · No drug or device payments recorded (2025) ·
(562) 860-8932 Dr. Francis Demichele, M.D.Cerritos, CA · No drug or device payments recorded (2025) ·
(323) 628-8671 Dr. I-hsiang Shu, MDCerritos, CA · No drug or device payments recorded (2025) ·
(626) 817-2094 Dr. Jada Ma, M.D.Cerritos, CA · No drug or device payments recorded (2025) ·
(562) 229-0902 Dr. Jeffrey Tavis, M.D.Cerritos, CA · $481 in drug and device payments (2025) ·
(562) 741-4470 Dr. Jihae Bahng, M.D.Cerritos, CA · $419 in drug and device payments (2025) ·
(323) 628-8671 Dr. John Ford, M.D.Cerritos, CA · No drug or device payments recorded (2025) ·
(562) 977-4639 Dr. Joyce Chou, M.D.Cerritos, CA · No drug or device payments recorded (2025) ·
(800) 823-4040 Dr. Kasey Kim, MDCerritos, CA · $57 in drug and device payments (2025) ·
(562) 924-9581 Dr. Ki Che, M.D.Cerritos, CA · No drug or device payments recorded (2025) ·
(562) 809-0142 Dr. Lynda Ngo, M.D.Cerritos, CA · No drug or device payments recorded (2025) ·
(800) 823-4040 Dr. Mary Eppie Gonzales, M.D.Cerritos, CA · $16 in drug and device payments (2025) ·
(562) 474-1605 Dr. Noel Bakh, MDCerritos, CA · No drug or device payments recorded (2025) ·
(562) 665-8819 Dr. Oliver Mason, MDCerritos, CA · $66 in drug and device payments (2025) ·
(562) 982-0010 Dr. Pinal Doshi, M.D.Cerritos, CA · $157 in drug and device payments (2025) · Telehealth ·
(562) 229-0902 Dr. Robert Collen, M.D.Cerritos, CA · No drug or device payments recorded (2025) ·
(714) 397-0768 Dr. Senthilraj Nadarajah, MDCerritos, CA · No drug or device payments recorded (2025) ·
(253) 232-7810 Dr. William Sim, M.D.Cerritos, CA · $104 in drug and device payments (2025) · Telehealth ·
(562) 653-5000 Dr. Cheryl Gray, MDChatsworth, CA · No drug or device payments recorded (2025) ·
(818) 426-3473 Dr. Abdullah Al Dwairi, M.D. Dr. Ahmet Turek, MDChico, CA · $150 in drug and device payments (2025) · Telehealth ·
(858) 568-0066 Dr. Alyssa Milliron, MDChico, CA · $994 in drug and device payments (2025) · Telehealth ·
(530) 342-4395 Dr. Arthur Brinckerhoff, M.D.Chico, CA · No drug or device payments recorded (2025) ·
(530) 872-6650 Dr. Barry Furst, MDChico, CA · No drug or device payments recorded (2025) ·
(530) 898-5241 Dr. David Alonso, MDChico, CA · $738 in drug and device payments (2025) · Telehealth ·
(530) 965-9900 Dr. Dmitry Leongardt, M.D.Chico, CA · No drug or device payments recorded (2025) ·
(530) 332-5557 Dr. Dragana Vagic, M.D.Chico, CA · No drug or device payments recorded (2025) ·
(530) 342-4395 Dr. James Carter, MDChico, CA · No drug or device payments recorded (2025) ·
(530) 891-6331 Dr. James Nagel, MDChico, CA · No drug or device payments recorded (2025) ·
(530) 893-0105 Dr. Jeffrey Carlson, D.O. Dr. Joanna HrabiaChico, CA · No drug or device payments recorded (2025) ·
(530) 332-7300 Dr. John Kremer, MDChico, CA · No drug or device payments recorded (2025) ·
(530) 342-7538 Dr. Joseph Shin, MDChico, CA · No drug or device payments recorded (2025) ·
(530) 332-7300 Dr. Larry Hsu, MDChico, CA · No drug or device payments recorded (2025) ·
(530) 893-9244 Dr. Linda Mendoza, MDChico, CA · No drug or device payments recorded (2025) ·
(530) 893-2323 Dr. Louise KroneChico, CA · $200 in drug and device payments (2025) · Telehealth ·
(530) 899-0143 Dr. Mark Weeber, MDChico, CA · $1,865 in drug and device payments (2025) · Telehealth ·
(530) 894-0500 Dr. Marytere Carrasquillo Navarro, MD Dr. Mehrdad Karimi, M.D.Chico, CA · No drug or device payments recorded (2025) ·
(530) 896-7456 Dr. Paul Schnur, M.D.Chico, CA · No drug or device payments recorded (2025) ·
(530) 879-5000 Dr. Prajapathi Lakireddy, M.D.Chico, CA · $220 in drug and device payments (2025) · Telehealth ·
(530) 332-4400 Dr. Richard Thorp, M.D.Chico, CA · No drug or device payments recorded (2025) · Telehealth ·
(530) 872-6650 Dr. Roberto Illa, M.D.Chico, CA · No drug or device payments recorded (2025) ·
(530) 345-1157 Dr. Sally Foltz, MDChico, CA · No drug or device payments recorded (2025) ·
(530) 894-0200 Dr. Vimali Paul, M.D.Chico, CA · $1,560 in drug and device payments (2025) ·
(530) 894-6600 Dr. Vinaykumar PanchalChico, CA · No drug or device payments recorded (2025) ·
(530) 332-7300 Dr. Ali Etemadian, D.O.Chino, CA · No drug or device payments recorded (2025) ·
(909) 591-6227 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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