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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. Rudo Benjamin, MD
Torrance, CA · $150 in drug and device payments (2025) · (310) 303-6833
Dr. Ruth Miranda, MD, MPH
Torrance, CA · No drug or device payments recorded (2025) · Telehealth · (310) 257-0028
Dr. Ryan Dwyer, MD
Torrance, CA · $121 in drug and device payments (2025) · (310) 222-3801
Dr. Saif Ghias, MD
Torrance, CA · No drug or device payments recorded (2025) · (310) 370-4660
Dr. Samuel Tomich, MD
Torrance, CA · $191 in drug and device payments (2025) · (310) 891-6623
Dr. Sandy Cho, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 540-7676
Dr. Sarah Soliman, MD
Torrance, CA · No drug or device payments recorded (2025) · (424) 323-8815
Dr. Sara Kanamori
Torrance, CA · $358 in drug and device payments (2025) · Telehealth · (424) 409-5080
Dr. Saroj Bharatiya, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 303-5900
Dr. Sarwat Mahmud, M.D.
Torrance, CA · $431 in drug and device payments (2025) · Telehealth · (310) 257-7260
Dr. Sean Chung, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 214-0811
Dr. Sharon Genato, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 214-0811
Dr. Sheena Dhadwal, DO
Torrance, CA · No drug or device payments recorded (2025) · (310) 214-0811
Dr. Shefalee Amin, MD
Torrance, CA · No drug or device payments recorded (2025) · Telehealth · (310) 214-0811
Dr. Sheherbano Mehdi, M.D
Torrance, CA · $1,008 in drug and device payments (2025) · Telehealth · (310) 373-0340
Dr. Shiva Barforoshi
Torrance, CA · $1,893 in drug and device payments (2025) · (310) 222-2345
Dr. Showshan Yang, MD
Torrance, CA · $67 in drug and device payments (2025) · (310) 222-3704
Dr. Sina Dadfarmay, MD
Torrance, CA · $22 in drug and device payments (2025) · (310) 214-0811
Dr. Sindalana Hean
Torrance, CA · No drug or device payments recorded (2025) · (310) 214-0811
Dr. Sobia Ashfaq, MD
Torrance, CA · $45 in drug and device payments (2025) · (310) 617-8036
Dr. Sofiya Reicher, MD
Torrance, CA · $1,757 in drug and device payments (2025) · (310) 222-2475
Dr. Sonia Shah, MD
Torrance, CA · $586 in drug and device payments (2025) · (102) 222-2515
Dr. So Won Kim, MD
Torrance, CA · No drug or device payments recorded (2025) · (310) 374-8191
Dr. Sriram Shamasunder, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 222-2409
Dr. Stephen Siegle, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 214-0811
Dr. Steven Cho
Torrance, CA · No drug or device payments recorded (2025) · (310) 257-0028
Dr. Sushan Joshi
Torrance, CA · $257 in drug and device payments (2025) · Telehealth · (310) 784-8000
Dr. Tai-hon Lin, M.D.
Torrance, CA · $988 in drug and device payments (2025) · (310) 541-8659
Dr. Tam Do, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 222-5610
Dr. Tanya Arvan, MD
Torrance, CA · No drug or device payments recorded (2025) · (310) 378-2234
Dr. Tejasvi Pasupneti
Torrance, CA · No drug or device payments recorded (2025) · (424) 306-4546
Dr. Thomas Lee, M.D.
Torrance, CA · $23 in drug and device payments (2025) · (310) 784-8770
Dr. Thomas Lin, M.D.
Torrance, CA · $886 in drug and device payments (2025) · (310) 543-1677
Dr. Tiffany Trinh, M.D.
Torrance, CA · $293 in drug and device payments (2025) · (310) 378-2234
Dr. Timothy Hatlen
Torrance, CA · $575 in drug and device payments (2025) · (310) 222-3813
Dr. Tina Jose, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (402) 213-3846
Dr. Toshiyuki Tanaka, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 792-9337
Dr. Tyler Jung, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 784-8770
Dr. Vadim Fanous, MD
Torrance, CA · No drug or device payments recorded (2025) · (310) 784-8770
Dr. Vivek Gupta, M.D.
Torrance, CA · $21,678 in drug and device payments (2025) · (310) 214-0811
Dr. William Kim, MD
Torrance, CA · $128 in drug and device payments (2025) · Telehealth · (310) 373-1400
Dr. William Stanford, MD, PHD
Torrance, CA · No drug or device payments recorded (2025) · (310) 737-8206
Dr. Zachary Tom
Torrance, CA · $243 in drug and device payments (2025) · (310) 222-2345
Dr. Zonglang Tsai, M.D.
Torrance, CA · $3,366 in drug and device payments (2025) · Telehealth · (310) 329-6395
Dr. Karen Black, M.D.
Torrrance, CA · $20 in drug and device payments (2025) · Telehealth · (310) 530-4281
Dr. Glenn Niegas, D.O.
Trabuco Canyon, CA · No drug or device payments recorded (2025) · (714) 403-1082
Dr. Babubhai Patel, M.D.
Tracy, CA · No drug or device payments recorded (2025) · (209) 836-3967
Dr. Chemanoor Zachariah, MD
Tracy, CA · $636 in drug and device payments (2025) · (209) 833-0886
Dr. Enrique Zarate, MD
Tracy, CA · $938 in drug and device payments (2025) · Telehealth · (209) 832-9178
Dr. Filadelfo Oandasan, M.D.
Tracy, CA · No drug or device payments recorded (2025) · (209) 835-4141

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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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.