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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. John Herziger, MD
Sierra Madre, CA · No drug or device payments recorded (2025) · (626) 466-1076
Dr. Leena Sahay, MD
Sierra Madre, CA · No drug or device payments recorded (2025) · (626) 355-3443
Dr. Linda Crawford, DO
Sierra Madre, CA · $45 in drug and device payments (2025) · (626) 836-6960
Dr. Liviu Chindris, M.D
Sierra Madre, CA · No drug or device payments recorded (2025) · (310) 480-4556
Dr. Phuong Nguyen, DO
Sierra Madre, CA · $635 in drug and device payments (2025) · Telehealth · (626) 355-3443
Dr. Nga Yu Cheung, MD
Signal Hill, CA · No drug or device payments recorded (2025) · Telehealth · (833) 574-2273
Dr. Abdol Memar-zia, MD
Simi Valley, CA · $20 in drug and device payments (2025) · Telehealth · (805) 527-6666
Dr. Anthony Phan, M.D.
Simi Valley, CA · No drug or device payments recorded (2025) · (805) 526-3213
Dr. Arin Abramian, NP
Simi Valley, CA · $559 in drug and device payments (2025) · (805) 915-4440
Dr. Brent Trompetto, MD
Simi Valley, CA · No drug or device payments recorded (2025) · (805) 210-7280
Dr. Chandrashekhar Joshi, MD
Simi Valley, CA · $62 in drug and device payments (2025) · (805) 522-3782
Dr. Charles Kennedy, MD
Simi Valley, CA · No drug or device payments recorded (2025) · (805) 217-6724
Dr. Cho May, M.D
Simi Valley, CA · No drug or device payments recorded (2025) · (626) 944-5144
Dr. Edward Posvar, M.D.
Simi Valley, CA · No drug or device payments recorded (2025) · (805) 501-7578
Dr. Farridah Shafiee, D.O.
Simi Valley, CA · $73 in drug and device payments (2025) · Telehealth · (805) 210-2424
Dr. Gabriela Rodriguez Melgoza
Simi Valley, CA · No drug or device payments recorded (2025) · Telehealth · (805) 583-7640
Dr. George Dichter, M.D.
Simi Valley, CA · No drug or device payments recorded (2025) · (805) 527-6424
Dr. Gurdip Flora, M.D
Simi Valley, CA · $146 in drug and device payments (2025) · (805) 583-4111
Dr. Harris Wasser, MD
Simi Valley, CA · No drug or device payments recorded (2025) · (805) 522-4004
Dr. Jasbir Tiwana, M.D
Simi Valley, CA · $70 in drug and device payments (2025) · (951) 278-5590
Dr. Jee Hoon Jang, MD
Simi Valley, CA · $31 in drug and device payments (2025) · (805) 522-5722
Dr. Jenna Gharzeddine, MD
Simi Valley, CA · No drug or device payments recorded (2025) · Telehealth · (805) 527-6424
Dr. Kevin Colwell, M.D.
Simi Valley, CA · No drug or device payments recorded (2025) · Telehealth · (888) 515-3500
Dr. Maria Garcia-jimenez, MD
Simi Valley, CA · No drug or device payments recorded (2025) · (805) 583-7640
Dr. Mojgan Makhsoosi, M.D. INC.
Simi Valley, CA · $563 in drug and device payments (2025) · Telehealth · (805) 915-0315
Dr. Ronald Omino, M.D.
Simi Valley, CA · No drug or device payments recorded (2025) · Telehealth · (805) 583-7640
Dr. Sangkyu Noh, DO
Simi Valley, CA · $53 in drug and device payments (2025) · (805) 955-6000
Dr. Smita Mandal, M.D.
Simi Valley, CA · $74 in drug and device payments (2025) · (805) 582-4000
Dr. William Lee, MD
Simi Valley, CA · $1,691 in drug and device payments (2025) · Telehealth · (818) 726-1930
Dr. William Matzner, M.D., PH.D.
Simi Valley, CA · No drug or device payments recorded (2025) · (805) 578-7000
Dr. Yuvraj Brar, MD
Simi Valley, CA · No drug or device payments recorded (2025) · (805) 955-6000
Dr. Dwight Winslow, MD
Smith River, CA · No drug or device payments recorded (2025) · (707) 487-9100
Dr. Joseph Iser, MD
Soda Springs, CA · No drug or device payments recorded (2025) · (530) 426-1336
Dr. Blaine Jackson, M.D.
Solana Beach, CA · $2,546 in drug and device payments (2025) · (858) 259-9708
Dr. Brigitte Sacco, L. AC.
Solana Beach, CA · No drug or device payments recorded (2025) · (315) 569-7801
Dr. Cindy Mong, M.D.
Solana Beach, CA · No drug or device payments recorded (2025) · (650) 814-9904
Dr. Daniel Pertschuk, M.D.
Solana Beach, CA · No drug or device payments recorded (2025) · (760) 535-2978
Dr. Jan Johnston, MD
Solana Beach, CA · No drug or device payments recorded (2025) · (650) 704-7651
Dr. Lawrence Susnow, MD
Solana Beach, CA · No drug or device payments recorded (2025) · (858) 523-0145
Dr. Mark Kalina, M.D.
Solana Beach, CA · $915 in drug and device payments (2025) · Telehealth · (858) 876-6360
Dr. Robert Yuhas, MD
Solana Beach, CA · $300 in drug and device payments (2025) · Telehealth · (858) 554-1212
Dr. Htay Aung, M.D., M.P.H
Soledad, CA · No drug or device payments recorded (2025) · (831) 678-3951
Dr. Mandeep Singh, M.D.
Soledad, CA · No drug or device payments recorded (2025) · (831) 678-5500
Dr. Gustavo Dascanio, MD
Solvang, CA · $143 in drug and device payments (2025) · (805) 688-5488
Dr. Kathryn Brewer, MD
Solvang, CA · $383 in drug and device payments (2025) · (805) 614-5690
Dr. Kim Peters, MD
Solvang, CA · No drug or device payments recorded (2025) · (805) 688-2600
Dr. Kiran Mariwalla, MD
Solvang, CA · $146 in drug and device payments (2025) · Telehealth · (805) 688-3440
Dr. Kyle Lemon, M.D.
Solvang, CA · No drug or device payments recorded (2025) · (805) 879-8160
Dr. Lisa Clement, M.D.
Solvang, CA · No drug or device payments recorded (2025) · (805) 686-5533
Dr. Miguel Loya, D.O.
Solvang, CA · No drug or device payments recorded (2025) · Telehealth · (805) 688-3440

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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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.