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. James Ericson, MDColton, CA · No drug or device payments recorded (2025) ·
(909) 580-6267 Dr. Jennifer Mullins, DOColton, CA · No drug or device payments recorded (2025) ·
(909) 580-1000 Dr. Justin Hoang, DOColton, CA · No drug or device payments recorded (2025) · Telehealth ·
(909) 580-1000 Dr. Karanjodh Johal, D.OColton, CA · No drug or device payments recorded (2025) ·
(909) 580-6266 Dr. Katherine Bourbeau-medinilla, MD Dr. Katlin Wieselthier, DOColton, CA · No drug or device payments recorded (2025) ·
(909) 580-1000 Dr. Kristina DhillonColton, CA · No drug or device payments recorded (2025) ·
(909) 580-6266 Dr. Mark Robinson, MDColton, CA · No drug or device payments recorded (2025) ·
(909) 580-1000 Dr. Mohammad Shahid Khan, MDColton, CA · No drug or device payments recorded (2025) ·
(909) 580-1000 Dr. Neeka ShayanColton, CA · No drug or device payments recorded (2025) · Telehealth ·
(909) 580-6266 Dr. Paul Lopez, M.D.Colton, CA · $1,135 in drug and device payments (2025) ·
(213) 705-1555 Dr. Raffi Gharakhanian, DO Dr. Ramiz AlchiColton, CA · No drug or device payments recorded (2025) ·
(619) 873-8464 Dr. Roy Lung, MDColton, CA · No drug or device payments recorded (2025) ·
(909) 580-1000 Dr. Sean Shargh, D.O.Colton, CA · No drug or device payments recorded (2025) ·
(909) 580-6266 Dr. Shahrukh MohsinColton, CA · No drug or device payments recorded (2025) ·
(909) 580-1000 Dr. Shawn Koh, M.D.Colton, CA · No drug or device payments recorded (2025) ·
(909) 580-1000 Dr. Sondos BadranColton, CA · No drug or device payments recorded (2025) ·
(909) 580-1000 Dr. Sunita Hassamal, M.D.Colton, CA · No drug or device payments recorded (2025) ·
(909) 580-1000 Dr. Sylvia Li, DOColton, CA · No drug or device payments recorded (2025) ·
(909) 580-1000 Dr. Terrence Tan, D.O.Colton, CA · No drug or device payments recorded (2025) ·
(909) 580-6275 Dr. Tiffany Chang, DOColton, CA · No drug or device payments recorded (2025) ·
(909) 580-6343 Dr. Timothy Yaopruke, DOColton, CA · No drug or device payments recorded (2025) ·
(909) 580-1000 Dr. Veerpal SondColton, CA · No drug or device payments recorded (2025) ·
(909) 580-1000 Dr. Ethelwoldo Guerrero, MDColusa, CA · No drug or device payments recorded (2025) · Telehealth ·
(530) 458-4250 Dr. Adrian Amooie, M.D.Commerce, CA · No drug or device payments recorded (2025) ·
(323) 914-5311 Dr. Emilio Feliz SalaCommerce, CA · No drug or device payments recorded (2025) ·
(562) 928-9600 Dr. Martin Serota, M.D.Commerce, CA · $400 in drug and device payments (2025) ·
(323) 725-8751 Dr. Rajesh Gade, M.D.Commerce, CA · No drug or device payments recorded (2025) ·
(323) 837-0998 Dr. Sreedevi Ayyala, MDCommerce, CA · No drug or device payments recorded (2025) ·
(562) 928-9600 Dr. Malcolm Blanchard, M.D.Compton, CA · No drug or device payments recorded (2025) ·
(310) 537-1337 Dr. Mohsen Jamei, MDCompton, CA · No drug or device payments recorded (2025) ·
(562) 630-6825 Dr. Muhammad Memon, M.D.Compton, CA · $74 in drug and device payments (2025) · Telehealth ·
(310) 639-7200 Dr. Sabine Nguyen, DOCompton, CA · No drug or device payments recorded (2025) ·
(424) 529-6755 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.
Related reading on HealthcareDiscovery.AI
Internal Medicine in all 50 states Search all 17,715 in the directory Ask Zach for help choosing
Related
