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. Simon Humphries, MD
Los Altos, CA · $93 in drug and device payments (2025) · Telehealth · (650) 917-6920
Dr. Steven Hamman, M.D.
Los Altos, CA · No drug or device payments recorded (2025) · (650) 903-0843
Dr. Steven Natterstad, M.D.
Los Altos, CA · No drug or device payments recorded (2025) · (650) 917-1357
Dr. Susan Sorensen, MD
Los Altos, CA · No drug or device payments recorded (2025) · (650) 941-5028
Dr. Tinuola Ademola, MD
Los Altos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 254-5200
Dr. Valerie Gurle, M.D.
Los Altos, CA · No drug or device payments recorded (2025) · (650) 949-1914
Dr. Alfred Rudolph, M.D.
Los Altos Hills, CA · No drug or device payments recorded (2025) · (650) 224-0762
Dr. Aaron Chiang, M.D.
Los Angeles, CA · $331 in drug and device payments (2025) · Telehealth · (310) 620-1888
Dr. Aarti Maskeri, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 783-4011
Dr. Aastha Jasrotia, MD
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (310) 429-7706
Dr. Abdollah Yousefzadeh
Los Angeles, CA · $31 in drug and device payments (2025) · (323) 859-2660
Dr. Abdulrahman Khaledy Sultan, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 613-5566
Dr. Abhinav Thummala
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 206-6232
Dr. Achraf Mansour, MD
Los Angeles, CA · $271 in drug and device payments (2025) · (310) 267-9643
Dr. Adam Cavallero, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (805) 418-3500
Dr. Adam Custer, MD
Los Angeles, CA · $64 in drug and device payments (2025) · (310) 206-6232
Dr. Adam Richards, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 206-1632
Dr. Adam Tempchin, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 409-7556
Dr. Adrian Mayo, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 267-9643
Dr. Adrianna Stanley
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 825-9111
Dr. Adrienne Dow, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 857-1235
Dr. Adrienne Youdim, MD
Los Angeles, CA · $53 in drug and device payments (2025) · (310) 423-8350
Dr. Agnes Rubio-joaquin, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 857-2000
Dr. Agustin Abdallah, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (323) 362-1010
Dr. Ahmad Jabaiah, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (323) 307-0800
Dr. Ahra Cho, M.D.
Los Angeles, CA · $1,327 in drug and device payments (2025) · Telehealth · (213) 529-4251
Dr. Akimi Ching, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 783-4011
Dr. Akunna Ogbu, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (510) 269-3498
Dr. Alan Chu, MD, MPH
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (310) 825-8307
Dr. Alan David, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (833) 574-2273
Dr. Alani Estrella, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 267-9643
Dr. Alan Kurz, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (213) 240-8049
Dr. Alan Lau, M.D.
Los Angeles, CA · $385 in drug and device payments (2025) · Telehealth · (323) 987-1362
Dr. Alan Rojas, M.D.
Los Angeles, CA · $174 in drug and device payments (2025) · Telehealth · (310) 945-6751
Dr. Albert Chow, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 783-4011
Dr. Albert Fite, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (213) 236-0313
Dr. Albert Mehany, MD
Los Angeles, CA · $12,550 in drug and device payments (2025) · (323) 783-4011
Dr. Alberto Jimeno, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (562) 725-1795
Dr. Alejandra Casillas, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 794-3508
Dr. Alejandro Gil, M.D.
Los Angeles, CA · $2,243 in drug and device payments (2025) · (213) 389-9100
Dr. Aleksandra Kozlova, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 825-7375
Dr. Alessandra Herbst De Cortina, MD
Los Angeles, CA · $117 in drug and device payments (2025) · (310) 825-7375
Dr. Alev Brown, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 226-7556
Dr. Alexander Gong, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 409-7556
Dr. Alexander Klonoff, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 409-7556
Dr. Alexander Li, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (213) 744-3676
Dr. Alexander Pham, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 206-6232
Dr. Alexandra Kaufman
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 206-6232
Dr. Alex Chai, M.D.
Los Angeles, CA · $602 in drug and device payments (2025) · (213) 484-8474
Dr. Alexis Gordon, MD
Los Angeles, CA · $123 in drug and device payments (2025) · (323) 541-1600

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.