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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. Jana Zawadzki Longtine, MD
Long Beach, CA · No drug or device payments recorded (2025) · (562) 426-3333
Dr. Jan Nguyen, D.O.
Long Beach, CA · No drug or device payments recorded (2025) · Telehealth · (562) 426-6571
Dr. Jasleen Tiwana, M.D.
Long Beach, CA · $387 in drug and device payments (2025) · Telehealth · (562) 826-8000
Dr. Jasminka Criley
Long Beach, CA · $24 in drug and device payments (2025) · (562) 491-9350
Dr. Jasmin Sidhu, M.D.
Long Beach, CA · No drug or device payments recorded (2025) · (562) 424-8814
Dr. Jason Fletcher, D.O.
Long Beach, CA · No drug or device payments recorded (2025) · (562) 424-4404
Dr. Javier Jimenez, MD
Long Beach, CA · $38 in drug and device payments (2025) · (562) 826-8000
Dr. Jay Park, MD
Long Beach, CA · No drug or device payments recorded (2025) · (562) 826-8000
Dr. Jeffrey Roth, D.O.
Long Beach, CA · No drug or device payments recorded (2025) · Telehealth · (562) 988-7000
Dr. Jeffrey Wu, D.O.
Long Beach, CA · No drug or device payments recorded (2025) · (562) 498-5112
Dr. Jennifer Lizcano, D.O.
Long Beach, CA · No drug or device payments recorded (2025) · (562) 997-2350
Dr. Jenny Lee, M.D
Long Beach, CA · $60 in drug and device payments (2025) · (562) 826-8000
Dr. Ji Kim, DO
Long Beach, CA · $70 in drug and device payments (2025) · (562) 491-9140
Dr. Jimmy Diep, M.D.
Long Beach, CA · No drug or device payments recorded (2025) · (562) 344-1150
Dr. Jinhua Shen, MD
Long Beach, CA · $30 in drug and device payments (2025) · (562) 491-9140
Dr. Joanna Tan, M.D.
Long Beach, CA · No drug or device payments recorded (2025) · (714) 436-4444
Dr. John Adams, D.O.
Long Beach, CA · $237 in drug and device payments (2025) · Telehealth · (562) 426-6571
Dr. John Awad, MD
Long Beach, CA · $176 in drug and device payments (2025) · (562) 989-1200
Dr. John Duong, M.D.
Long Beach, CA · $21 in drug and device payments (2025) · (562) 344-1150
Dr. John Kassabian, M.D.
Long Beach, CA · No drug or device payments recorded (2025) · (562) 599-8601
Dr. Jonathan Nguyen
Long Beach, CA · $812 in drug and device payments (2025) · (562) 591-3222
Dr. Jose Gonzalez, M.D.
Long Beach, CA · No drug or device payments recorded (2025) · (231) 669-6453
Dr. Justine Englanoff, MD
Long Beach, CA · No drug or device payments recorded (2025) · (562) 826-8000
Dr. Karen Dubowy-karpouzas, MD
Long Beach, CA · No drug or device payments recorded (2025) · (310) 508-9168
Dr. Katya Corado, M.D.
Long Beach, CA · $87 in drug and device payments (2025) · (562) 599-8601
Dr. Kelly Wang, DO
Long Beach, CA · No drug or device payments recorded (2025) · (562) 491-9140
Dr. Kenneth Labowe, M.D.
Long Beach, CA · No drug or device payments recorded (2025) · (562) 570-4053
Dr. Kenny Vu, D.O.
Long Beach, CA · No drug or device payments recorded (2025) · (562) 826-8000
Dr. Khang Nguyen, M.D.
Long Beach, CA · $123 in drug and device payments (2025) · (562) 426-3333
Dr. Khin-kyemon Aung, MD, MBA
Long Beach, CA · No drug or device payments recorded (2025) · (800) 964-4364
Dr. Khin Myint, M.D
Long Beach, CA · No drug or device payments recorded (2025) · (562) 826-8000
Dr. Kittya Paigne, MD
Long Beach, CA · $182 in drug and device payments (2025) · (562) 218-5350
Dr. Kristy Barker, MD
Long Beach, CA · No drug or device payments recorded (2025) · (562) 933-2000
Dr. Laila Nobakht
Long Beach, CA · $222 in drug and device payments (2025) · (562) 234-4926
Dr. Lance Hirano, MD
Long Beach, CA · No drug or device payments recorded (2025) · Telehealth · (562) 346-2222
Dr. Laurie Mortara, MD
Long Beach, CA · No drug or device payments recorded (2025) · Telehealth · (562) 346-2222
Dr. Lawrence Lerno, MD
Long Beach, CA · No drug or device payments recorded (2025) · (562) 826-8000
Dr. Li Ling Quek, M.D.
Long Beach, CA · No drug or device payments recorded (2025) · (562) 491-9350
Dr. Li Wen, M.D.
Long Beach, CA · No drug or device payments recorded (2025) · (562) 826-8000
Dr. Maged Tanios, M.D.
Long Beach, CA · $143 in drug and device payments (2025) · (562) 424-8000
Dr. Manuel Quinones, MD
Long Beach, CA · No drug or device payments recorded (2025) · (562) 491-9140
Dr. Marc Ofstein, M.D.
Long Beach, CA · No drug or device payments recorded (2025) · (562) 826-5484
Dr. Maritza Calonga, MD
Long Beach, CA · No drug or device payments recorded (2025) · (562) 826-8000
Dr. Mark Asbill, M.D.
Long Beach, CA · No drug or device payments recorded (2025) · (562) 492-5960
Dr. Mark Leibowitz, M.D.
Long Beach, CA · No drug or device payments recorded (2025) · (562) 304-1742
Dr. Mark Rose, MD
Long Beach, CA · No drug or device payments recorded (2025) · (562) 491-9000
Dr. Maurice Bell, MD
Long Beach, CA · No drug or device payments recorded (2025) · (562) 981-2355
Dr. Mauro Torno, M.D.
Long Beach, CA · No drug or device payments recorded (2025) · (562) 570-4317
Dr. Maziyar Shoaee, MD
Long Beach, CA · No drug or device payments recorded (2025) · Telehealth · (562) 429-2473
Dr. Melvie Kim, MD
Long Beach, CA · No drug or device payments recorded (2025) · (562) 826-8000

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

Related

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.