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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. Sonja Tang, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Stanley Ng, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Stephen Myung, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Steven Ko, MD
Fontana, CA · $2,151 in drug and device payments (2025) · (909) 427-2608
Dr. Suvan Sachdev, MD
Fontana, CA · No drug or device payments recorded (2025) · Telehealth · (909) 427-3910
Dr. Syeda Ameena
Fontana, CA · $191 in drug and device payments (2025) · (909) 355-1296
Dr. Syed Yusuf, M.D.
Fontana, CA · No drug or device payments recorded (2025) · (833) 574-2273
Dr. Te-ie Lee, M.D.
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-5310
Dr. Tim Shen, M.D.
Fontana, CA · $200 in drug and device payments (2025) · (909) 427-4873
Dr. Tin Nguyen, MD
Fontana, CA · $36 in drug and device payments (2025) · Telehealth · (909) 427-3910
Dr. Usha Raghavan, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3917
Dr. Wan Cheng Yeap, M.D.
Fontana, CA · No drug or device payments recorded (2025) · (617) 823-8457
Dr. Wei Chan Hwang, M.D.
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-2673
Dr. William Lai, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-5000
Dr. Xu He, D.O
Fontana, CA · $82,672 in drug and device payments (2025) · Telehealth · (909) 823-8000
Dr. Yang Li, D.O.
Fontana, CA · No drug or device payments recorded (2025) · (888) 750-0036
Dr. Yeo Youn, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Eugenia Zweibach
Foothill Ranch, CA · $546 in drug and device payments (2025) · Telehealth · (949) 557-0820
Dr. Elizabeth Khan
Fort Bragg, CA · No drug or device payments recorded (2025) · (707) 961-4631
Dr. James Swallow, MD
Fort Bragg, CA · No drug or device payments recorded (2025) · (707) 961-4631
Dr. Jason Kirkman, MD
Fort Bragg, CA · No drug or device payments recorded (2025) · (707) 961-4631
Dr. John Wallace, MD
Fort Bragg, CA · $115 in drug and device payments (2025) · (707) 964-1251
Dr. Kunal Goel
Fort Bragg, CA · $35 in drug and device payments (2025) · (707) 961-4631
Dr. Richard Sacks-wilner, MD
Fort Bragg, CA · No drug or device payments recorded (2025) · (707) 964-7241
Dr. Elliot Dano, MD
Fort Irwin, CA · No drug or device payments recorded (2025) · (760) 383-5289
Dr. Gary Wheeler, M.D.
Fort Irwin, CA · No drug or device payments recorded (2025) · (760) 380-3110
Dr. Teea Bunker, DO
Fort Irwin, CA · No drug or device payments recorded (2025) · (760) 383-5950
Dr. Allan Hotti, MD
Foster City, CA · No drug or device payments recorded (2025) · (650) 570-5330
Dr. Amanda Howard, MD
Foster City, CA · $632 in drug and device payments (2025) · Telehealth · (650) 918-5080
Dr. Jeffrey Finer, MDPHD
Foster City, CA · No drug or device payments recorded (2025) · (650) 533-7358
Dr. Lawrence William
Foster City, CA · No drug or device payments recorded (2025) · (650) 358-5811
Dr. Madhavi Varuputoor, M.D
Foster City, CA · $99 in drug and device payments (2025) · (267) 259-3816
Dr. Rajan Dave, M.D.
Foster City, CA · $407 in drug and device payments (2025) · Telehealth · (650) 918-5080
Dr. Aadesh Sachdeva, M.D.
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 665-1797
Dr. Adam Solomon, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 377-2900
Dr. Ahmed Al-sadek, M.D.
Fountain Valley, CA · $396 in drug and device payments (2025) · Telehealth · (310) 692-0224
Dr. Alan Dang, M.D.
Fountain Valley, CA · $3,245 in drug and device payments (2025) · (714) 369-6074
Dr. Ali Habib, D.O
Fountain Valley, CA · $21 in drug and device payments (2025) · (714) 665-1797
Dr. Alton Foran
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 549-1300
Dr. Andy Truong, M.D.
Fountain Valley, CA · $769 in drug and device payments (2025) · (714) 323-6446
Dr. Angela Biesen, D.O.
Fountain Valley, CA · $31 in drug and device payments (2025) · (714) 965-2500
Dr. Barbara Lever, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 964-6229
Dr. Brandon Khaw, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 549-1300
Dr. Calvin Tint, MD
Fountain Valley, CA · $125 in drug and device payments (2025) · (714) 549-1300
Dr. Cambria Hembree, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 965-2500
Dr. Collin Vu, M.D.
Fountain Valley, CA · $3,468 in drug and device payments (2025) · Telehealth · (714) 783-1838
Dr. Deeling Teng, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 377-2900
Dr. Don Phung, DO
Fountain Valley, CA · No drug or device payments recorded (2025) · Telehealth · (714) 549-1300
Dr. Eddie Ly, M.D.
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 665-1797
Dr. Ellen Gim, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 665-1797

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.