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. Woon Teck Yap
San Francisco, CA · No drug or device payments recorded (2025) · (415) 353-1968
Dr. Xiushui Ren, MD
San Francisco, CA · $327 in drug and device payments (2025) · (415) 377-1404
Dr. Xylona Bibal, MD
San Francisco, CA · $159 in drug and device payments (2025) · (415) 752-0100
Dr. Yangchen Dolkar, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 514-4533
Dr. Yanling Xu, MD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 750-5995
Dr. Yijiang Shi, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 750-5781
Dr. Yohanna Khachiyan, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 600-3954
Dr. Yong Liu, M.D.
San Francisco, CA · $3,295 in drug and device payments (2025) · Telehealth · (415) 221-0177
Dr. Yu-chen Hu, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 600-6000
Dr. Yukako Honda, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 923-3551
Dr. Yu Ting He, MD
San Francisco, CA · No drug or device payments recorded (2025) · (802) 847-2345
Dr. Yuwen Xu, MD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 833-2000
Dr. Zachary Call, MD
San Francisco, CA · No drug or device payments recorded (2025) · (925) 634-9704
Dr. Zakir Safdar, MD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-7900
Dr. Zayar Lin
San Francisco, CA · $150 in drug and device payments (2025) · (415) 391-9686
Dr. Zhe Cai, M.D.
San Francisco, CA · $121 in drug and device payments (2025) · (415) 391-9686
Dr. Zhen Lu, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 391-9686
Dr. Zhi Jian Zhong, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 333-8616
Dr. Zian Tseng, M.D.
San Francisco, CA · $1,562 in drug and device payments (2025) · Telehealth · (415) 353-2554
Dr. Zoe Kopp
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-7900
Dr. Zoe Quandt, M.D.
San Francisco, CA · $6,218 in drug and device payments (2025) · Telehealth · (415) 353-2350
Dr. Thuy Tran, D.O.
San Francsico, CA · $4,213 in drug and device payments (2025) · (619) 203-9515
Dr. Aaron Jeng, MD, MPH
San Gabriel, CA · $201 in drug and device payments (2025) · Telehealth · (626) 289-5454
Dr. Araceli Chanbonpin, M.D.
San Gabriel, CA · No drug or device payments recorded (2025) · (626) 285-5700
Dr. Charles Lin, MD
San Gabriel, CA · $430 in drug and device payments (2025) · (625) 287-8222
Dr. Emerald Tay, M.D
San Gabriel, CA · $224 in drug and device payments (2025) · (626) 307-8636
Dr. Etema Shilyansky, M.D.
San Gabriel, CA · No drug or device payments recorded (2025) · (626) 308-9220
Dr. Garry Pratt, MD
San Gabriel, CA · No drug or device payments recorded (2025) · (626) 943-3228
Dr. Hy Ngo, MD
San Gabriel, CA · $1,676 in drug and device payments (2025) · Telehealth · (626) 572-4658
Dr. Jeff Sao, M.D
San Gabriel, CA · No drug or device payments recorded (2025) · (626) 731-4000
Dr. Jennifer Chen, MD
San Gabriel, CA · No drug or device payments recorded (2025) · (626) 571-0111
Dr. Kenneth Chan, M.D.
San Gabriel, CA · $785 in drug and device payments (2025) · (626) 943-3229
Dr. Kevin Yao, MD MPH
San Gabriel, CA · $54 in drug and device payments (2025) · (626) 284-2000
Dr. Khee Tan, M.D.
San Gabriel, CA · No drug or device payments recorded (2025) · (626) 280-7055
Dr. Le-young Lee, MD
San Gabriel, CA · $318 in drug and device payments (2025) · Telehealth · (626) 457-8600
Dr. Lily Zhong, DO
San Gabriel, CA · No drug or device payments recorded (2025) · (626) 289-5454
Dr. Michael Ma, MD
San Gabriel, CA · No drug or device payments recorded (2025) · Telehealth · (626) 372-5922
Dr. Michelle Chan, M.D.
San Gabriel, CA · $88 in drug and device payments (2025) · Telehealth · (626) 943-0780
Dr. Peter Chiu, M.D.
San Gabriel, CA · $518 in drug and device payments (2025) · Telehealth · (626) 299-7100
Dr. Shih-fang Wang, MD
San Gabriel, CA · No drug or device payments recorded (2025) · (626) 943-3229
Dr. Su Lee, M.D.
San Gabriel, CA · $2,124 in drug and device payments (2025) · Telehealth · (626) 293-1988
Dr. Tai Wu, MD
San Gabriel, CA · $507 in drug and device payments (2025) · Telehealth · (626) 943-9240
Dr. Thomas Yu, M.D.
San Gabriel, CA · $1,365 in drug and device payments (2025) · (626) 288-0300
Dr. William Ng, MD
San Gabriel, CA · No drug or device payments recorded (2025) · (408) 469-3856
Dr. Yu Yao, M.D.
San Gabriel, CA · $1,500 in drug and device payments (2025) · Telehealth · (626) 288-1918
Dr. Zhi Zeng, MD
San Gabriel, CA · $19 in drug and device payments (2025) · Telehealth · (626) 300-8880
Dr. Gurinder Narain, MD
Sanger, CA · $457 in drug and device payments (2025) · Telehealth · (559) 875-5545
Dr. Jose Bautista, M.D.
Sanger, CA · $1,511 in drug and device payments (2025) · Telehealth · (559) 875-3428
Dr. Tarlochan Tagore, MD
Sanger, CA · $243 in drug and device payments (2025) · (559) 875-5521
Dr. Lwin Htun, M.D.
San Jacinto, CA · No drug or device payments recorded (2025) · (951) 654-4175

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.