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. William Baker, M.D.Bakersfield, CA · $1,482 in drug and device payments (2025) · Telehealth ·
(661) 616-9300 Dr. William Gilli, M.D.Bakersfield, CA · $1,337 in drug and device payments (2025) · Telehealth ·
(661) 617-6750 Dr. Win Thi, M.DBakersfield, CA · No drug or device payments recorded (2025) ·
(661) 334-2009 Dr. Xinbo Cheng, MDBakersfield, CA · No drug or device payments recorded (2025) ·
(661) 664-3825 Dr. Zar Aung, M.D.Bakersfield, CA · No drug or device payments recorded (2025) ·
(661) 334-2009 Dr. Allen Onizuka, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Allen Yee, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Andrew Kim, MDBaldwin Park, CA · $45 in drug and device payments (2025) ·
(626) 851-1011 Dr. Arcelia Martin, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Arjang KasraviBaldwin Park, CA · No drug or device payments recorded (2025) ·
(800) 780-1277 Dr. Basheer AlasBaldwin Park, CA · No drug or device payments recorded (2025) ·
(833) 574-2273 Dr. Beatrice Quezada, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Betty Chen, MDBaldwin Park, CA · $22 in drug and device payments (2025) ·
(626) 851-1011 Dr. Caitlin DateBaldwin Park, CA · No drug or device payments recorded (2025) · Telehealth ·
(800) 780-1277 Dr. Carolyn Hardy, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Connie XuBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Daisy Lynn Galario, M.D.Baldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-7167 Dr. Daniel Kim, DOBaldwin Park, CA · No drug or device payments recorded (2025) ·
(833) 574-2273 Dr. David Sullivan, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Dennis Matejka, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Hannah Sim, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Hsuan Wei-zee, M.D.Baldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Ignacio Borenstein, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(833) 574-2273 Dr. James Aguiar, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Jayon Kim, M.D.Baldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Jennifer Mah, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(833) 574-2273 Dr. Jenny Teng, MDBaldwin Park, CA · $141 in drug and device payments (2025) ·
(626) 851-1011 Dr. Jieli Li, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Joanna Chen, MDBaldwin Park, CA · $14 in drug and device payments (2025) · Telehealth ·
(626) 851-1011 Dr. John Bigley, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Juan Gamboa, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Jyh Chang, M.D.Baldwin Park, CA · $27 in drug and device payments (2025) · Telehealth ·
(626) 962-5141 Dr. Ka Ho, MDBaldwin Park, CA · $181 in drug and device payments (2025) · Telehealth ·
(626) 851-1011 Dr. Kester Wu, DOBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Kevin Aranguri, MDBaldwin Park, CA · $22 in drug and device payments (2025) ·
(833) 574-2273 Dr. Kiet Lieu, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Kiet Phan, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Lyn Lederman, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Manav Shah, MDBaldwin Park, CA · No drug or device payments recorded (2025) · Telehealth ·
(800) 780-1277 Dr. Maria Gomez, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Mariano Panes, M.D.Baldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 960-5369 Dr. Mauricio Acevedo, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Michael Schwartz, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Michelle Wang, M.D.Baldwin Park, CA · $386 in drug and device payments (2025) ·
(626) 851-1011 Dr. Minh Tri Le, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Paul Han, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Peter Lee, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(833) 574-2273 Dr. Que Nguyen, MDBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 851-1011 Dr. Rao Atluri, MD MEDICO GENERALISTBaldwin Park, CA · No drug or device payments recorded (2025) ·
(626) 338-7338 Dr. Robert Clements, MDBaldwin Park, CA · $35 in drug and device payments (2025) ·
(626) 851-1011 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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