HealthcareDiscovery.AI / Doctors / California / Internal Medicine

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 in Los Angeles1,417 providers
Internal Medicine in San Francisco1,322 providers
Internal Medicine in San Diego970 providers
Internal Medicine in Sacramento602 providers
Internal Medicine in Oakland434 providers
Internal Medicine in San Jose433 providers
Internal Medicine in Stanford383 providers
Internal Medicine in Fresno339 providers
Internal Medicine in Torrance230 providers
Internal Medicine in Long Beach225 providers
Internal Medicine in Bakersfield210 providers
Internal Medicine in Loma Linda209 providers
Internal Medicine in Palo Alto189 providers
Internal Medicine in Anaheim188 providers
Internal Medicine in Orange188 providers
Internal Medicine in Riverside188 providers
Internal Medicine in Walnut Creek184 providers
Internal Medicine in Santa Monica170 providers
Internal Medicine in La Jolla161 providers
Internal Medicine in Roseville159 providers
Internal Medicine in Irvine155 providers
Internal Medicine in Beverly Hills152 providers
Internal Medicine in Santa Clara142 providers
Internal Medicine in Pasadena138 providers

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. Ben Lin, M.D.
San Leandro, CA · $156 in drug and device payments (2025) · (510) 454-1000
Dr. Chao Ho
San Leandro, CA · $918 in drug and device payments (2025) · Telehealth · (510) 618-1663
Dr. Chi-na Pak, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 454-2305
Dr. Chizoba Nwosu, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Christian Dang, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Christian Reyes, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. David Charo, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · Telehealth · (510) 454-1000
Dr. David Tseng, D.O.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 357-6500
Dr. Deepak Dhawan, MD
San Leandro, CA · $219 in drug and device payments (2025) · Telehealth · (510) 351-1193
Dr. Deepa Reddy, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · Telehealth · (510) 454-1000
Dr. Dennis Ha, MD
San Leandro, CA · No drug or device payments recorded (2025) · (530) 567-6500
Dr. Derek Shek, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Eugenia Zumwalt, D.O.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 362-5144
Dr. Evelyn Nakagawa, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (415) 233-3604
Dr. Faizan Ahmad, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · Telehealth · (510) 454-1000
Dr. Gwendolen Chang, M.D.
San Leandro, CA · $1,616 in drug and device payments (2025) · Telehealth · (510) 351-9373
Dr. Hadie Khodabakhsh, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (650) 451-8655
Dr. Harley Schultz, MD
San Leandro, CA · No drug or device payments recorded (2025) · (510) 351-1193
Dr. Jacqueline Richards, M.D.
San Leandro, CA · $15 in drug and device payments (2025) · (510) 454-1000
Dr. James Waterhouse, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Jennifer Tinloy, DO
San Leandro, CA · No drug or device payments recorded (2025) · (510) 454-4010
Dr. Jereld Wing, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · Telehealth · (510) 454-1000
Dr. Jeremy Murdock, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Joseph Teng, DO
San Leandro, CA · No drug or device payments recorded (2025) · (510) 954-9972
Dr. Judy Chang-witt, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · Telehealth · (510) 454-7300
Dr. Katherine Lim-young, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · Telehealth · (510) 454-1000
Dr. Kiran Nandamuri, M.D.
San Leandro, CA · $105 in drug and device payments (2025) · (510) 454-1000
Dr. Kruthika Proddatoori, M.D
San Leandro, CA · $798 in drug and device payments (2025) · Telehealth · (510) 351-1193
Dr. Leo Chi, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Lincoln Sison, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 746-0510
Dr. Louis Edelson, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Ma. Dina Santos, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · Telehealth · (510) 454-1000
Dr. Mahesh Lellella, MD
San Leandro, CA · No drug or device payments recorded (2025) · (510) 454-3000
Dr. Marta Moreno, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Marut Thongcharoen
San Leandro, CA · No drug or device payments recorded (2025) · (510) 357-8300
Dr. Mary Hong, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Mei Kung, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 315-7196
Dr. Michael Niaki, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (650) 852-1364
Dr. Monika Yadav, M.D.
San Leandro, CA · $16 in drug and device payments (2025) · (510) 454-1000
Dr. Namrata Patyal
San Leandro, CA · $1,957 in drug and device payments (2025) · (510) 351-6424
Dr. Nehal Ghevariya
San Leandro, CA · No drug or device payments recorded (2025) · Telehealth · (510) 357-8180
Dr. Padmavathi Madathanapalli, MD
San Leandro, CA · No drug or device payments recorded (2025) · (510) 351-6363
Dr. Ratnadeep Patel, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · Telehealth · (510) 454-1000
Dr. Ratnasothy Rajah, MD
San Leandro, CA · $21 in drug and device payments (2025) · (510) 895-9721
Dr. Rubinder Kaur
San Leandro, CA · No drug or device payments recorded (2025) · (510) 388-6395
Dr. Sandeep Lal, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Sarada Emany, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Sara Shushtarian, MD
San Leandro, CA · $29 in drug and device payments (2025) · Telehealth · (510) 454-2381
Dr. Sejal Jhatakia, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 483-2555
Dr. Sherri Huang, MD, PHD
San Leandro, CA · No drug or device payments recorded (2025) · Telehealth · (510) 454-1000

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.

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

Try a city like Tucson, a zip like 85016, or a specialty like psychiatry. For a doctor by name, use the full search.
Sources: NPPES (CMS), Doctors and Clinicians national files, CMS Open Payments 2025. Updated monthly. Records are public federal data and are not verified credentials, licensure checks, or endorsements. This directory is informational and not medical advice. How we build this directory. Are you a Internal Medicine in California? Get featured.