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. Christos Bovetas, M.D.Corona, CA · $1,116 in drug and device payments (2025) · Telehealth ·
(951) 371-2703 Dr. Edward Politoske, MDCorona, CA · No drug or device payments recorded (2025) ·
(951) 734-9930 Dr. Ennis Zaitoon, M.D.Corona, CA · $4,932 in drug and device payments (2025) · Telehealth ·
(951) 493-6870 Dr. Fadia Attia, MDCorona, CA · No drug or device payments recorded (2025) ·
(951) 734-3233 Dr. Farnoosh Farshidi, M.D.Corona, CA · No drug or device payments recorded (2025) ·
(951) 737-4343 Dr. Fatima Gauhar, MDCorona, CA · $143 in drug and device payments (2025) · Telehealth ·
(951) 493-6910 Dr. Garvin Patel, M.D.Corona, CA · $80 in drug and device payments (2025) · Telehealth ·
(951) 281-2730 Dr. George Chidi, M.D.Corona, CA · $164 in drug and device payments (2025) · Telehealth ·
(951) 272-5900 Dr. Helen Patzanakidis, M.D.Corona, CA · $793 in drug and device payments (2025) · Telehealth ·
(951) 737-1454 Dr. Huong Nguyen, M.D.Corona, CA · $95 in drug and device payments (2025) · Telehealth ·
(951) 735-6969 Dr. Imran Hasnain, MDCorona, CA · $118 in drug and device payments (2025) · Telehealth ·
(951) 737-1000 Dr. James Roy, MDCorona, CA · No drug or device payments recorded (2025) ·
(951) 734-9930 Dr. Jasmine Leong, M.D.Corona, CA · $24 in drug and device payments (2025) · Telehealth ·
(951) 549-0200 Dr. John Yang, M.D.Corona, CA · No drug or device payments recorded (2025) ·
(951) 737-4343 Dr. Jun Yuan, M.D.Corona, CA · No drug or device payments recorded (2025) ·
(951) 808-8863 Dr. Laura Nieves, MDCorona, CA · $774 in drug and device payments (2025) · Telehealth ·
(951) 554-5778 Dr. Loricar SantosCorona, CA · No drug or device payments recorded (2025) ·
(951) 737-4343 Dr. Mario Ficarola, M.D.Corona, CA · No drug or device payments recorded (2025) ·
(951) 493-6926 Dr. Marita Banzuela, M.D.Corona, CA · No drug or device payments recorded (2025) ·
(909) 597-1771 Dr. Michael Lam, M.D.Corona, CA · No drug or device payments recorded (2025) ·
(951) 339-8229 Dr. Michael Molinari, MDCorona, CA · No drug or device payments recorded (2025) ·
(951) 734-9930 Dr. Michelle Zaki, D.O.Corona, CA · No drug or device payments recorded (2025) ·
(951) 293-4722 Dr. Mohammad Mahmud, MD, MPH, PHDCorona, CA · No drug or device payments recorded (2025) ·
(951) 340-2178 Dr. Mohammad Shahin, MDCorona, CA · $83 in drug and device payments (2025) · Telehealth ·
(951) 493-6805 Dr. Mohammed Qubba, M.D.Corona, CA · No drug or device payments recorded (2025) ·
(951) 339-9700 Dr. Mustafa Al Lami, M.D.Corona, CA · No drug or device payments recorded (2025) ·
(818) 238-7828 Dr. Nahlla Dolle, M.D.Corona, CA · No drug or device payments recorded (2025) ·
(951) 549-0900 Dr. Patricia Bogema, D.O.Corona, CA · No drug or device payments recorded (2025) · Telehealth ·
(951) 268-1001 Dr. Patrick Bonaparte, M.D.Corona, CA · No drug or device payments recorded (2025) ·
(702) 874-4484 Dr. Qais Ayouby, MDCorona, CA · $393 in drug and device payments (2025) · Telehealth ·
(951) 543-9344 Dr. Richard Corcoran, M.D.Corona, CA · No drug or device payments recorded (2025) ·
(951) 471-2202 Dr. Rishi Patel, M.D.Corona, CA · No drug or device payments recorded (2025) ·
(951) 339-8459 Dr. Rona Liu, MDCorona, CA · No drug or device payments recorded (2025) ·
(909) 597-1771 Dr. Sophia Ho, DOCorona, CA · No drug or device payments recorded (2025) ·
(951) 493-6925 Dr. Thomas Assali, DOCorona, CA · No drug or device payments recorded (2025) · Telehealth ·
(951) 737-4343 Dr. Thong Ngo, DOCorona, CA · No drug or device payments recorded (2025) ·
(951) 339-8459 Dr. Thuy Pham, DOCorona, CA · No drug or device payments recorded (2025) · Telehealth ·
(855) 505-7457 Dr. Valeria Madrid Malo Bohorquez, M.D.Corona, CA · No drug or device payments recorded (2025) · Telehealth ·
(951) 898-7355 Dr. Walter Silva, MDCorona, CA · No drug or device payments recorded (2025) ·
(951) 735-9211 Dr. Kaveh Karandish, MDCorona Del Mar, CA · No drug or device payments recorded (2025) ·
(949) 242-9166 Dr. Meera Shukla, M.D.Corona Del Mar, CA · No drug or device payments recorded (2025) · Telehealth ·
(949) 610-5139 Dr. Michael TencatiCorona Del Mar, CA · No drug or device payments recorded (2025) ·
(858) 750-5477 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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