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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. Suresh Rangarajan, M.D., MSC
San Diego, CA · No drug or device payments recorded (2025) · (619) 543-6268
Dr. Susan Little, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 543-8080
Dr. Susan Shuchter, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 298-1318
Dr. Tadd Lazarus, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 410-8086
Dr. Taejun Lee, MD
San Diego, CA · $133 in drug and device payments (2025) · (858) 832-2478
Dr. Talal Nasser, M.D.
San Diego, CA · $500 in drug and device payments (2025) · (619) 692-8232
Dr. Talya Bordin-wosk
San Diego, CA · No drug or device payments recorded (2025) · (619) 543-6222
Dr. Tanner Long
San Diego, CA · No drug or device payments recorded (2025) · (619) 543-6268
Dr. Tanner Slayden, MD
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (800) 926-8273
Dr. Tara Akashi, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Teja Singh, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 779-4686
Dr. Tejpreet Nakai, D.O.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (800) 926-8273
Dr. Terence Gan, MD MPH
San Diego, CA · $123 in drug and device payments (2025) · (626) 485-8622
Dr. Teresa Jones, DO
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Terry Lou
San Diego, CA · No drug or device payments recorded (2025) · (800) 926-8273
Dr. Thaidan Pham, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 543-6268
Dr. Thejas Kamath
San Diego, CA · No drug or device payments recorded (2025) · (858) 657-7000
Dr. Theodore Geer, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Theresa Bohun, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 297-3737
Dr. Thomas Martin, M.D.
San Diego, CA · $60 in drug and device payments (2025) · Telehealth · (800) 926-8273
Dr. Thomas Mosher, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 939-6570
Dr. Thomas Spethmann, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Thuy-tien Dam, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 543-3667
Dr. Tiffany Ho
San Diego, CA · No drug or device payments recorded (2025) · (619) 543-6268
Dr. Timothy Corbin, MD
San Diego, CA · $147 in drug and device payments (2025) · Telehealth · (858) 657-5000
Dr. Timothy Drake, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 552-8585
Dr. Timothy Dresselhaus, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 552-8585
Dr. Timothy O'neill, M.D.
San Diego, CA · $62 in drug and device payments (2025) · (619) 260-0670
Dr. Tomoko Tanabe, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 552-8585
Dr. Tong Zhang, M.D.
San Diego, CA · $104 in drug and device payments (2025) · (619) 528-5000
Dr. Tonia Vyenielo, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 400-5024
Dr. Tony Lopez, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (619) 543-6283
Dr. Tricia Santos Cavaiola, M.D
San Diego, CA · $62 in drug and device payments (2025) · (619) 543-1849
Dr. Tri Lac, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 245-2830
Dr. Tsuh-yin Chen, MD
San Diego, CA · $23 in drug and device payments (2025) · (619) 515-2300
Dr. Tuan Dang, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 400-5050
Dr. Tue Nguyen, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 280-7185
Dr. Tung Lai, MD
San Diego, CA · $474 in drug and device payments (2025) · (858) 653-0147
Dr. Tu Truong, M.D.
San Diego, CA · $2,253 in drug and device payments (2025) · (619) 583-8705
Dr. Uladzislau Naidzionak, M.D.
San Diego, CA · $2,890 in drug and device payments (2025) · (858) 571-2811
Dr. Umer Hayyat, MD
San Diego, CA · $288 in drug and device payments (2025) · (858) 939-3400
Dr. Unna Albers, M.D.
San Diego, CA · $148 in drug and device payments (2025) · Telehealth · (858) 657-8000
Dr. Vakas Sial, M.D
San Diego, CA · No drug or device payments recorded (2025) · (619) 663-6521
Dr. Vanessa Canonigo, D.O.
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Varinthrej Pitis, M.D.
San Diego, CA · $83 in drug and device payments (2025) · Telehealth · (858) 764-3028
Dr. Viacheslav Pecherskiy, M.D.
San Diego, CA · $122 in drug and device payments (2025) · (858) 499-4763
Dr. Victor De Leon-hernandez, MD
San Diego, CA · $22 in drug and device payments (2025) · (787) 308-9559
Dr. Victor Lin, M.D.
San Diego, CA · $407 in drug and device payments (2025) · Telehealth · (858) 554-1212
Dr. Vikki Lane, M.D.
San Diego, CA · $57 in drug and device payments (2025) · Telehealth · (858) 764-3000
Dr. Vincent Felitti, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000

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

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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.