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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. Dai Pham, M.D.
Garden Grove, CA · No drug or device payments recorded (2025) · (714) 788-5566
Dr. Danh Dan, M.D.
Garden Grove, CA · No drug or device payments recorded (2025) · (714) 697-9347
Dr. Daniel Luong, M.D.
Garden Grove, CA · No drug or device payments recorded (2025) · (714) 899-2000
Dr. Douglas Clark, M.D.
Garden Grove, CA · $310 in drug and device payments (2025) · Telehealth · (714) 530-7373
Dr. Edward Ko, M.D.
Garden Grove, CA · No drug or device payments recorded (2025) · (888) 499-9303
Dr. Euil Lim, D.O
Garden Grove, CA · $14 in drug and device payments (2025) · (714) 537-5160
Dr. Hung Nguyen, M.D.
Garden Grove, CA · $506 in drug and device payments (2025) · (714) 539-0444
Dr. Hung Quan, MD
Garden Grove, CA · No drug or device payments recorded (2025) · (714) 899-2000
Dr. Jae Man Park, M.D.
Garden Grove, CA · $16 in drug and device payments (2025) · (714) 534-1112
Dr. Jimmy Wu, M.D.
Garden Grove, CA · $1,486 in drug and device payments (2025) · (714) 636-7852
Dr. Jonathan Warnelo, D.O.
Garden Grove, CA · No drug or device payments recorded (2025) · (714) 537-7800
Dr. Julie Hwynn, M.D.
Garden Grove, CA · $881 in drug and device payments (2025) · Telehealth · (714) 741-0501
Dr. Kyu Yun, MD
Garden Grove, CA · No drug or device payments recorded (2025) · (714) 636-0133
Dr. Michael Dao, M.D.
Garden Grove, CA · $10,507 in drug and device payments (2025) · Telehealth · (714) 899-2000
Dr. Negin Behazin, MD
Garden Grove, CA · $331 in drug and device payments (2025) · (714) 636-9850
Dr. Nga Nguyen, M.D.
Garden Grove, CA · $41 in drug and device payments (2025) · (714) 741-3522
Dr. Nhan Nguyen, M.D.
Garden Grove, CA · No drug or device payments recorded (2025) · (714) 537-8269
Dr. Philip Lynn, M.D.
Garden Grove, CA · No drug or device payments recorded (2025) · Telehealth · (714) 839-4545
Dr. Phuong Tran, DO
Garden Grove, CA · No drug or device payments recorded (2025) · (714) 899-2000
Dr. Robert Ha, MD
Garden Grove, CA · $2,551 in drug and device payments (2025) · Telehealth · (714) 636-3032
Dr. Sarah Strube, DO
Garden Grove, CA · No drug or device payments recorded (2025) · (714) 383-2250
Dr. Se-young Lee, M.D.
Garden Grove, CA · $96 in drug and device payments (2025) · Telehealth · (714) 468-5490
Dr. Shireen Khalife, DO
Garden Grove, CA · $95 in drug and device payments (2025) · Telehealth · (714) 537-7800
Dr. Son Le, M.D.
Garden Grove, CA · $94 in drug and device payments (2025) · (714) 698-3880
Dr. Stephen Park, MD
Garden Grove, CA · No drug or device payments recorded (2025) · (714) 534-3366
Dr. Tam Le, MD
Garden Grove, CA · $172 in drug and device payments (2025) · (714) 643-9442
Dr. Tam Nguyen, M.D.
Garden Grove, CA · $16 in drug and device payments (2025) · Telehealth · (714) 805-8260
Dr. Tan Nguyen, M.D.
Garden Grove, CA · No drug or device payments recorded (2025) · (800) 768-1977
Dr. Theodore Rose, MD
Garden Grove, CA · $243 in drug and device payments (2025) · (716) 636-9852
Dr. Thomas Ton, M.D
Garden Grove, CA · $1,830 in drug and device payments (2025) · (714) 898-8888
Dr. Tiffany Nguyen, M.D.
Garden Grove, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Tinh Tran, MD
Garden Grove, CA · $179 in drug and device payments (2025) · (714) 898-8888
Dr. Tuan Xuan Nguyen, MD
Garden Grove, CA · $156 in drug and device payments (2025) · Telehealth · (714) 530-2420
Dr. Vanessa Tatum, M.D.
Garden Grove, CA · No drug or device payments recorded (2025) · (714) 530-4489
Dr. Anuj Vaid, M.D.
Gilroy, CA · No drug or device payments recorded (2025) · (408) 842-5190
Dr. Carol Paige, MD
Gilroy, CA · No drug or device payments recorded (2025) · (408) 848-4600
Dr. James Frankfort, MD
Gilroy, CA · No drug or device payments recorded (2025) · (408) 319-7613
Dr. Kenneth Tan, MD
Gilroy, CA · No drug or device payments recorded (2025) · Telehealth · (408) 848-4600
Dr. Lilly Hammack, DO, RDN
Gilroy, CA · No drug or device payments recorded (2025) · (408) 848-4600
Dr. Lisa Lo, MD
Gilroy, CA · $50 in drug and device payments (2025) · (408) 848-4095
Dr. Matthew Watson, M.D., M.P.H.
Gilroy, CA · No drug or device payments recorded (2025) · (408) 848-4600
Dr. Pardeep Gondal, MD
Gilroy, CA · No drug or device payments recorded (2025) · (408) 848-2000
Dr. Robert Biggs, MD
Gilroy, CA · No drug or device payments recorded (2025) · (408) 848-4600
Dr. Samuel Wu, M.D.,PH.D.
Gilroy, CA · $1,067 in drug and device payments (2025) · Telehealth · (408) 846-1800
Dr. Siri Chand Khalsa, MD
Gilroy, CA · No drug or device payments recorded (2025) · (480) 747-3083
Dr. Stephen Shey
Gilroy, CA · No drug or device payments recorded (2025) · (408) 848-2000
Dr. Sunita Lalwani, MD
Gilroy, CA · No drug or device payments recorded (2025) · Telehealth · (408) 848-4600
Dr. Tolison Fowler
Gilroy, CA · No drug or device payments recorded (2025) · (408) 848-2000
Dr. Vasumitha Alamelu, MD
Gilroy, CA · No drug or device payments recorded (2025) · (408) 848-4600
Dr. Vincent Tir
Gilroy, CA · No drug or device payments recorded (2025) · (408) 848-2000

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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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.