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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. Vi-van Nguyen
San Diego, CA · No drug or device payments recorded (2025) · (858) 657-7000
Dr. Vivian Terkel, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 764-3350
Dr. Vivian Tran, M.D.
San Diego, CA · $89 in drug and device payments (2025) · Telehealth · (619) 245-2350
Dr. Vivian Tso, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 859-1188
Dr. Wadi Rouel, M.D.
San Diego, CA · $910 in drug and device payments (2025) · (619) 584-1612
Dr. Wayne Katz, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 554-7830
Dr. Wayne Kurisu, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (858) 499-2600
Dr. Wayne Levin, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Wenhui Liu, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Whan Kim, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 277-7111
Dr. Wilfredo Abesamis, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 229-5075
Dr. William Chin, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 532-6460
Dr. William Cory, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. William Hardison, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 487-0273
Dr. William Harless, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 499-2600
Dr. William Hughson, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 294-6201
Dr. William Mittendorff, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 278-3300
Dr. William Sperling, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. William Toppen, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (800) 926-8273
Dr. William Tseng, MD
San Diego, CA · $27 in drug and device payments (2025) · (619) 528-5000
Dr. Wisam Razook, DO
San Diego, CA · $292 in drug and device payments (2025) · (858) 939-3400
Dr. Xing Ren, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (619) 245-2350
Dr. Yan Xing, MD
San Diego, CA · $98 in drug and device payments (2025) · Telehealth · (619) 543-6529
Dr. Yash Prakash, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 657-8530
Dr. Yenny Lim, M.D.
San Diego, CA · $632 in drug and device payments (2025) · Telehealth · (858) 764-9000
Dr. Youmna Abdulhadi, MD
San Diego, CA · No drug or device payments recorded (2025) · (513) 638-1575
Dr. Youngmi Kim, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 532-6827
Dr. Yuan Shao, M.D.
San Diego, CA · $34 in drug and device payments (2025) · Telehealth · (619) 543-7832
Dr. Yuan Zhong, MD
San Diego, CA · $104 in drug and device payments (2025) · (619) 528-5000
Dr. Yunmi Kim
San Diego, CA · $286 in drug and device payments (2025) · (844) 200-2426
Dr. Zehui Tan, M.D.
San Diego, CA · $104 in drug and device payments (2025) · Telehealth · (858) 499-2705
Dr. Zia Agha, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 552-8585
Dr. Zuhaib Murtaza, MD
San Diego, CA · $241 in drug and device payments (2025) · (858) 939-3400
Dr. Afshin Saadat, MD
San Dimas, CA · $181 in drug and device payments (2025) · (909) 599-6300
Dr. Eki Edwards, M.D.
San Dimas, CA · No drug or device payments recorded (2025) · (760) 241-6666
Dr. Fari Kamalpour, D.O.
San Dimas, CA · $151 in drug and device payments (2025) · (818) 730-1183
Dr. John Low, M.D.
San Dimas, CA · No drug or device payments recorded (2025) · (909) 592-6411
Dr. Raymond Esparza, M.D.
San Dimas, CA · No drug or device payments recorded (2025) · Telehealth · (909) 394-0044
Dr. Ron Dunchok, MD
San Dimas, CA · No drug or device payments recorded (2025) · (909) 599-6300
Dr. Tracy Lin, DO
San Dimas, CA · $319 in drug and device payments (2025) · (909) 542-2777
Dr. Vijay Patel, M.D.
San Dimas, CA · $471 in drug and device payments (2025) · Telehealth · (995) 929-9778
Dr. Zouhair Hakak, MD
San Dimas, CA · $306 in drug and device payments (2025) · (909) 267-9138
Dr. Albert Pascual, M.D.
San Fernando, CA · No drug or device payments recorded (2025) · (818) 365-8086
Dr. Dieu Thu Nguyen, MD
San Fernando, CA · No drug or device payments recorded (2025) · (818) 837-6969
Dr. Hafiz Parray, MD
San Fernando, CA · $163 in drug and device payments (2025) · Telehealth · (818) 365-5661
Dr. Jennifer Sayles, M.D.
San Fernando, CA · No drug or device payments recorded (2025) · (818) 365-8086
Dr. Michael Wallack, M.D.
San Fernando, CA · No drug or device payments recorded (2025) · (818) 365-8086
Dr. Silvia Darie, M.D.
San Fernando, CA · No drug or device payments recorded (2025) · (818) 365-8086
Dr. Stephanie Green, MD
San Fernando, CA · $23 in drug and device payments (2025) · Telehealth · (818) 837-6969
Dr. Aana Brenman, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 833-2000

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

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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.