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. John Ernsberger, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 527-7559 Dr. John Lauridsen, M.D.Anaheim, CA · $324 in drug and device payments (2025) ·
(714) 974-2820 Dr. John Stouffer, MDAnaheim, CA · $102 in drug and device payments (2025) ·
(714) 827-5140 Dr. Julie Brown, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 826-1200 Dr. Kambiz Nooryani, M.D.Anaheim, CA · No drug or device payments recorded (2025) · Telehealth ·
(888) 988-2800 Dr. Kamran Haghighat, MDAnaheim, CA · No drug or device payments recorded (2025) · Telehealth ·
(714) 826-1200 Dr. Katarzyna Twardowska, MD Dr. Kathleen Trivich, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 991-5700 Dr. Kenneth Han, D.O.Anaheim, CA · $130,706 in drug and device payments (2025) ·
(714) 827-0700 Dr. Kenneth Horwitz, M.D. Dr. Kevin Pham, M.D.Anaheim, CA · $740 in drug and device payments (2025) ·
(714) 644-2000 Dr. Kristin Cummings, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(833) 574-2273 Dr. Lakshmi Sadasivam, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 772-8282 Dr. Lawrence Tawa, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 517-2019 Dr. Lawrence Vu, DOAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Leah Huang, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(833) 574-2273 Dr. Lucia Young, D.O.Anaheim, CA · $284 in drug and device payments (2025) ·
(714) 995-7503 Dr. Maria Cristina Hsu, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Mariam Bishara, MD-PHDAnaheim, CA · No drug or device payments recorded (2025) ·
(323) 668-7930 Dr. Maritess Aranas, D.O.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 202-2330 Dr. Mark Abramson, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Maryam Bahramfarsi, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Melissa Rapp, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Michael Janoff, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Michael LiuAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 644-2000 Dr. Michael Salvaggio, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 279-4594 Dr. Miguel Jimenez Ulloa, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 631-4766 Dr. Minal Borsada, MDAnaheim, CA · $341 in drug and device payments (2025) ·
(714) 441-0411 Dr. Minh Tran, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Min Min Mya, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 772-8282 Dr. Nancy Gin, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Nguyenvy Tran, D.O.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 772-8282 Dr. Nhut Vuong, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 279-4103 Dr. Nidhi Patel, D.O.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 772-8282 Dr. Niem Nguyen, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 399-9222 Dr. Olaniyi Fadeyi, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(832) 870-2089 Dr. Osvaldo Rodriguez, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Parvin Nazari, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 995-1000 Dr. Priya Monahan, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Raffi Hodikian, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 202-2330 Dr. Rajeev Ambe, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Raymond Huang, MDAnaheim, CA · No drug or device payments recorded (2025) · Telehealth ·
(888) 988-2800 Dr. Rebecca Do, DOAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 644-2000 Dr. Ricardo Bardales MendozaAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 644-2000 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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