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. Julie Lu, MDLos Alamitos, CA · No drug or device payments recorded (2025) ·
(562) 799-8881 Dr. Khalid MaznaviLos Alamitos, CA · No drug or device payments recorded (2025) ·
(562) 506-8662 Dr. Ky Tran, M.D.Los Alamitos, CA · No drug or device payments recorded (2025) · Telehealth ·
(562) 430-1235 Dr. Larry Drum, MDLos Alamitos, CA · No drug or device payments recorded (2025) ·
(562) 795-6406 Dr. Lindsay Mossinger, M.D.Los Alamitos, CA · No drug or device payments recorded (2025) · Telehealth ·
(562) 430-0805 Dr. Michael Le, MDLos Alamitos, CA · $79 in drug and device payments (2025) ·
(562) 598-1311 Dr. Michelle Ryan, MDLos Alamitos, CA · No drug or device payments recorded (2025) ·
(562) 431-3535 Dr. Petra Wong, MDLos Alamitos, CA · No drug or device payments recorded (2025) ·
(562) 430-6472 Dr. Puja Shrestha, MDLos Alamitos, CA · No drug or device payments recorded (2025) · Telehealth ·
(562) 344-1350 Dr. Rene Perez-silva, MDLos Alamitos, CA · No drug or device payments recorded (2025) ·
(562) 594-9546 Dr. Richard Rucker, M.D.Los Alamitos, CA · $322 in drug and device payments (2025) ·
(562) 596-2246 Dr. Richard Wexler, MDLos Alamitos, CA · $703 in drug and device payments (2025) · Telehealth ·
(562) 431-3535 Dr. Robert Melikian, M.D.Los Alamitos, CA · No drug or device payments recorded (2025) ·
(562) 594-8149 Dr. Ronald Pepitone, M.D.Los Alamitos, CA · No drug or device payments recorded (2025) ·
(562) 988-7000 Dr. Salima Hassanali, D.O., MPHLos Alamitos, CA · No drug or device payments recorded (2025) ·
(562) 344-1350 Dr. Sarah Sandell, MDLos Alamitos, CA · No drug or device payments recorded (2025) ·
(562) 936-0292 Dr. Sheida Kashani, D.O.Los Alamitos, CA · $432 in drug and device payments (2025) ·
(562) 716-7466 Dr. Shivanand Pole, M.DLos Alamitos, CA · $211 in drug and device payments (2025) · Telehealth ·
(562) 546-7282 Dr. Steven Becker, D.O.Los Alamitos, CA · $799 in drug and device payments (2025) · Telehealth ·
(714) 768-6501 Dr. Susan Sleep, MDLos Alamitos, CA · No drug or device payments recorded (2025) ·
(562) 936-0292 Dr. Talin Nemri, M.D.Los Alamitos, CA · No drug or device payments recorded (2025) ·
(562) 430-0015 Dr. Vichai Bhoopat, M.D.Los Alamitos, CA · No drug or device payments recorded (2025) ·
(562) 493-4466 Dr. Victor Kabbany, M.D.Los Alamitos, CA · $578 in drug and device payments (2025) ·
(562) 554-5430 Dr. William Harrell, MDLos Alamitos, CA · No drug or device payments recorded (2025) ·
(310) 948-5903 Dr. Winston Chung, MDLos Alamitos, CA · $282 in drug and device payments (2025) · Telehealth ·
(562) 594-9546 Dr. Yasemin Balin, MDLos Alamitos, CA · $906 in drug and device payments (2025) ·
(562) 596-1667 Dr. Yasmin Herring, MDLos Alamitos, CA · No drug or device payments recorded (2025) · Telehealth ·
(714) 827-3667 Dr. Allan Kramer, M.D.Los Altos, CA · No drug or device payments recorded (2025) ·
(650) 224-4970 Dr. Amy Muzaffar, MDLos Altos, CA · No drug or device payments recorded (2025) ·
(650) 254-5200 Dr. Bhanu-rekha Bhaskar, MDLos Altos, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 254-5200 Dr. Carrie Mousseau, M.D.Los Altos, CA · No drug or device payments recorded (2025) ·
(650) 888-5790 Dr. Charles Tuchinda, M.D.Los Altos, CA · No drug or device payments recorded (2025) ·
(617) 930-6428 Dr. Dianne Storey, MDLos Altos, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 254-5200 Dr. Francis Lastufka, MDLos Altos, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 254-5200 Dr. Gina Serraiocco, MDLos Altos, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 254-5200 Dr. Heba Yassin Jioussy, MDLos Altos, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 254-5200 Dr. Jacqueline Denkabe, MDLos Altos, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 254-5200 Dr. Janusz Madej, M.D.Los Altos, CA · $718 in drug and device payments (2025) ·
(650) 529-1669 Dr. Jessica Favreau, MDLos Altos, CA · No drug or device payments recorded (2025) ·
(650) 668-2558 Dr. Jessica Madej, MDLos Altos, CA · $876 in drug and device payments (2025) ·
(650) 529-1669 Dr. Julia Fong, MDLos Altos, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 254-5200 Dr. Karen Suskiewicz, MDLos Altos, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 254-5200 Dr. Karthikeyan Viswanathan, DOLos Altos, CA · $29 in drug and device payments (2025) ·
(866) 362-4246 Dr. Lailey Naomi Oliva, MDLos Altos, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 254-5200 Dr. Laurel Trujillo, MDLos Altos, CA · No drug or device payments recorded (2025) ·
(650) 254-5200 Dr. Patricia Sitnitsky, M.D.Los Altos, CA · $2,243 in drug and device payments (2025) · Telehealth ·
(408) 495-5770 Dr. Paul Tang, M.D.Los Altos, CA · No drug or device payments recorded (2025) ·
(650) 254-5200 Dr. Payvand MilaniLos Altos, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 254-5200 Dr. Ronda Macchello, MDLos Altos, CA · No drug or device payments recorded (2025) ·
(650) 254-5200 Dr. Ronesh Sinha, MDLos Altos, CA · $66 in drug and device payments (2025) · Telehealth ·
(650) 254-5200 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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