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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. Armando Hool, M.D.
Huntington Beach, CA · No drug or device payments recorded (2025) · (714) 377-9333
Dr. Catherine Gentemann, M.D.
Huntington Beach, CA · No drug or device payments recorded (2025) · Telehealth · (714) 848-0080
Dr. Chin Cha Cheng, MD
Huntington Beach, CA · No drug or device payments recorded (2025) · (714) 848-3565
Dr. Curtis Davis
Huntington Beach, CA · No drug or device payments recorded (2025) · (626) 893-8837
Dr. Dale Ellis, MD
Huntington Beach, CA · No drug or device payments recorded (2025) · (714) 964-4448
Dr. Daniel Hilton, MD
Huntington Beach, CA · $95 in drug and device payments (2025) · (714) 843-6800
Dr. Danny Vo, M.D.
Huntington Beach, CA · No drug or device payments recorded (2025) · Telehealth · (714) 378-4995
Dr. David Tsong, M.D.
Huntington Beach, CA · $3,753 in drug and device payments (2025) · Telehealth · (714) 848-8131
Dr. Dena Zedan, M.D.
Huntington Beach, CA · No drug or device payments recorded (2025) · (714) 968-0068
Dr. Douglas Allen, M.D.
Huntington Beach, CA · No drug or device payments recorded (2025) · (714) 465-9616
Dr. Edward Etzkorn, MD
Huntington Beach, CA · No drug or device payments recorded (2025) · (714) 968-0068
Dr. Evelyne Llorente, MD
Huntington Beach, CA · $103 in drug and device payments (2025) · (714) 885-8980
Dr. Francesca Sakamoto, MD
Huntington Beach, CA · No drug or device payments recorded (2025) · Telehealth · (714) 477-8020
Dr. Jennifer Keiner, MD
Huntington Beach, CA · $385 in drug and device payments (2025) · Telehealth · (714) 960-4500
Dr. Jillian Gray, D.O.
Huntington Beach, CA · $1,484 in drug and device payments (2025) · Telehealth · (714) 941-2259
Dr. Joseph Nassir, MD
Huntington Beach, CA · $1,502 in drug and device payments (2025) · Telehealth · (714) 843-6800
Dr. Julie Copon, D.O.
Huntington Beach, CA · No drug or device payments recorded (2025) · (714) 848-5240
Dr. Julie Matsuura, M.D.
Huntington Beach, CA · No drug or device payments recorded (2025) · Telehealth · (714) 378-4995
Dr. Kevin Ivey, M.D.
Huntington Beach, CA · No drug or device payments recorded (2025) · (714) 840-3441
Dr. Khadija Mayet, MD
Huntington Beach, CA · $546 in drug and device payments (2025) · Telehealth · (714) 968-0068
Dr. Linda Lam, MD
Huntington Beach, CA · No drug or device payments recorded (2025) · Telehealth · (714) 968-0068
Dr. Louay Shawesh, MD
Huntington Beach, CA · No drug or device payments recorded (2025) · (714) 916-3810
Dr. Marcela Espinosa, M.D.
Huntington Beach, CA · No drug or device payments recorded (2025) · (714) 377-9333
Dr. Mark Fredrick, MD
Huntington Beach, CA · $120 in drug and device payments (2025) · Telehealth · (714) 968-0068
Dr. Michael Khatibi, M.D.
Huntington Beach, CA · No drug or device payments recorded (2025) · (714) 968-7800
Dr. Michael Le, M.D.
Huntington Beach, CA · $26 in drug and device payments (2025) · (657) 400-5180
Dr. Nancy Tran, D.O.
Huntington Beach, CA · No drug or device payments recorded (2025) · (714) 717-3861
Dr. Nannette Mitchell, M.D.
Huntington Beach, CA · $99 in drug and device payments (2025) · (714) 848-0080
Dr. Nga Wong, M.D.
Huntington Beach, CA · No drug or device payments recorded (2025) · (714) 898-9635
Dr. Nishu Karki
Huntington Beach, CA · $77 in drug and device payments (2025) · (714) 248-9068
Dr. Pamela Sullivan, MD
Huntington Beach, CA · No drug or device payments recorded (2025) · (657) 237-2450
Dr. Patrick Farrell, M.D.
Huntington Beach, CA · No drug or device payments recorded (2025) · (714) 514-2490
Dr. Paula Jan, M.D,
Huntington Beach, CA · No drug or device payments recorded (2025) · (858) 336-3104
Dr. Phuong Anh Doan, M.D.
Huntington Beach, CA · No drug or device payments recorded (2025) · (714) 963-1030
Dr. Ratul Chatterjee, M.D.
Huntington Beach, CA · $868 in drug and device payments (2025) · Telehealth · (714) 378-2403
Dr. Scott Mancuso, M.D.
Huntington Beach, CA · No drug or device payments recorded (2025) · (657) 400-5180
Dr. Son Nguyen, M.D.
Huntington Beach, CA · $18 in drug and device payments (2025) · Telehealth · (714) 378-2404
Dr. Stephanie Fong
Huntington Beach, CA · No drug or device payments recorded (2025) · Telehealth · (714) 848-0080
Dr. Subha Amatya, M.D.
Huntington Beach, CA · No drug or device payments recorded (2025) · Telehealth · (714) 378-0900
Dr. Terry Fan, M.D.
Huntington Beach, CA · No drug or device payments recorded (2025) · Telehealth · (714) 477-8490
Dr. Thomas Goodheart, M.D.
Huntington Beach, CA · No drug or device payments recorded (2025) · (714) 593-0272
Dr. Thuyhan Tran, M.D., M.P.H.
Huntington Beach, CA · No drug or device payments recorded (2025) · Telehealth · (714) 841-7293
Dr. Valerio Kalaw, MD
Huntington Beach, CA · $117 in drug and device payments (2025) · (608) 879-0619
Dr. Wernher Ovalle, MD
Huntington Beach, CA · $379 in drug and device payments (2025) · Telehealth · (714) 845-5900
Dr. Albert Lee
Huntington Park, CA · No drug or device payments recorded (2025) · (323) 923-1281
Dr. Alberto Alonso, M.D.
Huntington Park, CA · $947 in drug and device payments (2025) · (562) 881-3043
Dr. Daniela Drake, M.D.
Huntington Park, CA · No drug or device payments recorded (2025) · (323) 583-3010
Dr. Edwin Zevallos, M.D.
Huntington Park, CA · No drug or device payments recorded (2025) · (323) 588-9800
Dr. Laura Castro Castrezana, MD
Huntington Park, CA · No drug or device payments recorded (2025) · (888) 499-9303
Dr. Lucio Sanchez, MD
Huntington Park, CA · No drug or device payments recorded (2025) · (323) 277-7678

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.