HealthcareDiscovery.AI / Doctors / California / Internal Medicine

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. Sonia Monga, M.D.
Thousand Oaks, CA · $1,154 in drug and device payments (2025) · Telehealth · (805) 495-1066
Dr. Steven Mccarthy, M.D.
Thousand Oaks, CA · No drug or device payments recorded (2025) · Telehealth · (805) 418-3500
Dr. Theodore Okerson, M.D.
Thousand Oaks, CA · $123 in drug and device payments (2025) · (805) 447-9105
Dr. Trevor Owens, DO
Thousand Oaks, CA · $52 in drug and device payments (2025) · (805) 497-2727
Dr. Virginia Perez Andreu, MD PHD
Thousand Oaks, CA · No drug or device payments recorded (2025) · Telehealth · (805) 309-0525
Dr. William Coburn, M.D.
Thousand Oaks, CA · No drug or device payments recorded (2025) · (805) 495-0455
Dr. Yasimin Taheri
Thousand Oaks, CA · No drug or device payments recorded (2025) · (805) 370-4733
Dr. Ziad Abdullatif, D.O.
Thousand Oaks, CA · $30 in drug and device payments (2025) · (805) 852-9229
Dr. Zoya Furman, M.D.
Thousand Oaks, CA · $2,776 in drug and device payments (2025) · (805) 494-8520
Dr. Jose Hernandez, M.D
Toluca Lake, CA · $909 in drug and device payments (2025) · (818) 842-7145
Dr. Michael Marsh, M.D.
Toluca Lake, CA · $796 in drug and device payments (2025) · Telehealth · (818) 842-7145
Dr. Crystal Mattimore, M.D.
Topanga, CA · No drug or device payments recorded (2025) · (310) 455-1536
Dr. Douglas Roy, M.D.
Topanga, CA · No drug or device payments recorded (2025) · (310) 455-2019
Dr. Gregory Skipper, M.D.
Topanga, CA · No drug or device payments recorded (2025) · (310) 633-4595
Dr. Aaron Tran, M.D.
Torrance, CA · $1,500 in drug and device payments (2025) · Telehealth · (310) 294-9444
Dr. Aeree Yoon, MD
Torrance, CA · $2,218 in drug and device payments (2025) · Telehealth · (310) 793-4673
Dr. Aida Martinez
Torrance, CA · $146 in drug and device payments (2025) · (844) 804-0055
Dr. Ai Takahashi, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 222-2345
Dr. Ajit Mannan, M.D.
Torrance, CA · $173 in drug and device payments (2025) · (310) 891-6623
Dr. Akiko Suzuki, M.D.
Torrance, CA · $19 in drug and device payments (2025) · Telehealth · (310) 326-5661
Dr. Albert Cespedes, M.D.
Torrance, CA · $16 in drug and device payments (2025) · (310) 222-2409
Dr. Alexander Shen, M.D.
Torrance, CA · $389 in drug and device payments (2025) · (310) 891-6623
Dr. Alexandra Ly
Torrance, CA · $155 in drug and device payments (2025) · (310) 222-2404
Dr. Allen Pachtman, M.D.
Torrance, CA · $72 in drug and device payments (2025) · (310) 863-9060
Dr. Amer Khan, MD
Torrance, CA · No drug or device payments recorded (2025) · (310) 374-8191
Dr. Amity Tran, MD
Torrance, CA · No drug or device payments recorded (2025) · (424) 306-4000
Dr. Andrew Cai, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (978) 569-6984
Dr. Angela Tang, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 325-9110
Dr. Anhtuan Tong, MD
Torrance, CA · $552 in drug and device payments (2025) · (310) 856-4944
Dr. Anshu Abhat
Torrance, CA · No drug or device payments recorded (2025) · (424) 306-6500
Dr. Anthony Dike, MD
Torrance, CA · No drug or device payments recorded (2025) · (323) 434-4626
Dr. Antonio Bonet, MD
Torrance, CA · No drug or device payments recorded (2025) · (310) 222-2409
Dr. Antonio Rivas, M.D.
Torrance, CA · $191 in drug and device payments (2025) · (310) 222-3891
Dr. Anuj Datta, MD
Torrance, CA · $58 in drug and device payments (2025) · (310) 222-2409
Dr. Ariba Masood, MD
Torrance, CA · $740 in drug and device payments (2025) · (310) 534-8200
Dr. Arielle Bilek
Torrance, CA · No drug or device payments recorded (2025) · Telehealth · (310) 257-0028
Dr. Armen Zeitjian, MD
Torrance, CA · $2,099 in drug and device payments (2025) · (310) 222-2345
Dr. Aruna Ramayya, M.D.
Torrance, CA · $652 in drug and device payments (2025) · (310) 534-8445
Dr. Asad Khaja, MD
Torrance, CA · No drug or device payments recorded (2025) · (310) 370-4660
Dr. Ashely Williams, MD
Torrance, CA · $455 in drug and device payments (2025) · (310) 222-2345
Dr. Ashkan Tadayoni
Torrance, CA · $648 in drug and device payments (2025) · (424) 306-4000
Dr. Ayushi Desai, M.D.
Torrance, CA · $145 in drug and device payments (2025) · (310) 325-9110
Dr. Azhar Muttalib, M.D.
Torrance, CA · $1,180 in drug and device payments (2025) · Telehealth · (310) 373-9980
Dr. Babar Saeed, MD
Torrance, CA · $83 in drug and device payments (2025) · Telehealth · (877) 782-0300
Dr. Bahman Bandari, MD
Torrance, CA · $267 in drug and device payments (2025) · Telehealth · (310) 419-8585
Dr. Beth Dorn, MD
Torrance, CA · $148 in drug and device payments (2025) · Telehealth · (310) 375-2288
Dr. Bie-chin Wu, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 375-7811
Dr. Brian Chow, MD
Torrance, CA · $892 in drug and device payments (2025) · (424) 306-4000
Dr. Brittany Christian, MD
Torrance, CA · $80 in drug and device payments (2025) · (310) 222-2345
Dr. Bryan Lau, MD
Torrance, CA · No drug or device payments recorded (2025) · (310) 365-1341

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.