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. Yin Chu Chang, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 644-2000 Dr. Yixing Li, DOAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 772-8282 Dr. Yudu Chen, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Caren Chen, MDAnaheim Hills, CA · No drug or device payments recorded (2025) ·
(714) 282-6934 Dr. Donna Frisch, MDAnaheim Hills, CA · No drug or device payments recorded (2025) ·
(714) 282-6934 Dr. Anthony Silpanone, M.D.Anahiem, CA · No drug or device payments recorded (2025) ·
(714) 644-2000 Dr. Raj KumariAnderson, CA · $190 in drug and device payments (2025) ·
(530) 365-4265 Dr. Laura Jones, MD, MSAngels Camp, CA · $28 in drug and device payments (2025) ·
(209) 736-0813 Dr. Aaron Der, M.D.Antioch, CA · No drug or device payments recorded (2025) ·
(925) 813-6500 Dr. Al Sumaquial, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 779-5000 Dr. Andrew YusranAntioch, CA · No drug or device payments recorded (2025) ·
(925) 813-6500 Dr. Anita Cherian, MDAntioch, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 779-5000 Dr. Anita Mittal, MDAntioch, CA · No drug or device payments recorded (2025) ·
(202) 276-3770 Dr. Carl Corrigan, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 779-5000 Dr. Chung Kung, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 813-6500 Dr. David Langkammer, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 813-6500 Dr. Dileep Kumar, M.D.Antioch, CA · No drug or device payments recorded (2025) ·
(925) 757-5790 Dr. Edmon Soliman, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 779-5000 Dr. Elaine Sumaquial, M.D.Antioch, CA · No drug or device payments recorded (2025) ·
(925) 779-5090 Dr. Errisha Richardson, MDAntioch, CA · No drug or device payments recorded (2025) ·
(573) 882-4438 Dr. Evgeniya Dickstein, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 779-5000 Dr. Fatima Syed, M.D.Antioch, CA · $115 in drug and device payments (2025) · Telehealth ·
(925) 756-3400 Dr. Felix Vergara, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 779-5000 Dr. Gabriel Palladino, MD Dr. Gulshan Panjwani, MDAntioch, CA · $196 in drug and device payments (2025) ·
(925) 779-5000 Dr. Hsiao-pin Chin, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 813-6500 Dr. Ioannis Eleftheriadis, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 813-6500 Dr. Irina Bronstein, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 779-5000 Dr. Jalal Atmar, MDAntioch, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 813-6500 Dr. Jaryn Park, M.D.Antioch, CA · No drug or device payments recorded (2025) ·
(925) 756-1192 Dr. Jaspreet Sandhu, MDAntioch, CA · $62 in drug and device payments (2025) · Telehealth ·
(925) 813-6500 Dr. Jessica Xiao, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 858-1579 Dr. Kausalya Bhaskarabhatla, M.D.Antioch, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 813-6500 Dr. Kishore Maskey, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 779-5000 Dr. Kourosh Moazemi, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 432-3318 Dr. Letha Jayakrishnan, MDAntioch, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 813-6500 Dr. Lloyd Asuncion, MDAntioch, CA · No drug or device payments recorded (2025) · Telehealth ·
(409) 789-1936 Dr. Lourdes Jimenez, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 779-5000 Dr. Marlane Fretz, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 779-5000 Dr. Martin Cogburn, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 779-5000 Dr. Mary-ann Malik, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 779-5000 Dr. Matthew Lucero, D.OAntioch, CA · $32 in drug and device payments (2025) · Telehealth ·
(925) 756-3400 Dr. Melissa Carucci, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 813-6500 Dr. Mira Elnan, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 779-5000 Dr. Nahid Nazminia, MDAntioch, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 779-5000 Dr. Naissem Andemel, MD, MPHAntioch, CA · No drug or device payments recorded (2025) · Telehealth ·
(259) 813-6061 Dr. Neeraj Tiwari, MDAntioch, CA · No drug or device payments recorded (2025) ·
(925) 813-6500 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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