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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. Chengcong Wu, M.D.
Diamond Bar, CA · No drug or device payments recorded (2025) · (909) 612-1191
Dr. Claire Daniel, MD
Diamond Bar, CA · No drug or device payments recorded (2025) · (916) 602-9801
Dr. Edwin Chuong, M.D.
Diamond Bar, CA · No drug or device payments recorded (2025) · (626) 388-2319
Dr. Lorindha Argudo, MD
Diamond Bar, CA · No drug or device payments recorded (2025) · Telehealth · (909) 861-2675
Dr. Manish Mehta, M.D.
Diamond Bar, CA · No drug or device payments recorded (2025) · (909) 979-3162
Dr. Michael Kwok, M.D.
Diamond Bar, CA · No drug or device payments recorded (2025) · (909) 594-1848
Dr. Phillip Wunder, D.O.
Diamond Bar, CA · No drug or device payments recorded (2025) · (909) 860-8300
Dr. Steve Chan, MD
Diamond Bar, CA · $27 in drug and device payments (2025) · (909) 612-5835
Dr. Yuh-huey Wang, MD
Diamond Bar, CA · $259 in drug and device payments (2025) · (909) 612-5835
Dr. Jeanine Ellinwood, M.D
Diamond Springs, CA · No drug or device payments recorded (2025) · (530) 621-7820
Dr. Amanat Grewal, MD
Dinuba, CA · No drug or device payments recorded (2025) · (715) 387-5260
Dr. Lance Goebel, MD , PHARMD
Dinuba, CA · No drug or device payments recorded (2025) · (559) 356-4442
Dr. Sarvamitra Awasthi, M.D.
Dinuba, CA · No drug or device payments recorded (2025) · (559) 591-1224
Dr. Lety Costa, MD
Dos Palos, CA · No drug or device payments recorded (2025) · (209) 722-4842
Dr. Aalap Mehta
Downey, CA · No drug or device payments recorded (2025) · (562) 904-5000
Dr. Adeline Manohar, D.O
Downey, CA · No drug or device payments recorded (2025) · (833) 574-2273
Dr. Adip Pillai-kashi, DO
Downey, CA · No drug or device payments recorded (2025) · (562) 657-7129
Dr. Adrian Quezada, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 803-0124
Dr. Alan Frischer, M.D.
Downey, CA · $2,638 in drug and device payments (2025) · Telehealth · (562) 806-0874
Dr. Arsineh Khachekian, D.O.
Downey, CA · No drug or device payments recorded (2025) · Telehealth · (562) 657-9000
Dr. Arthur Carrasco, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 319-2085
Dr. Ashkan Amooee, M.D.
Downey, CA · $31 in drug and device payments (2025) · (323) 201-6800
Dr. Austin Evans, D.O.
Downey, CA · $138 in drug and device payments (2025) · (626) 590-4601
Dr. Ava Azimi, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 904-5000
Dr. Basuki Gunawan, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 657-4292
Dr. Behfar Gidanian, MD
Downey, CA · No drug or device payments recorded (2025) · (562) 401-7161
Dr. Bhoomin Nimitsilpa, MD
Downey, CA · No drug or device payments recorded (2025) · (800) 823-4040
Dr. Brandon Lui
Downey, CA · No drug or device payments recorded (2025) · (562) 657-9000
Dr. Brittney Brown, DO
Downey, CA · $198 in drug and device payments (2025) · (562) 385-7111
Dr. Byron Rastegari, DO
Downey, CA · No drug or device payments recorded (2025) · Telehealth · (833) 574-2273
Dr. Caroline King, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 272-6267
Dr. Charlene Wang
Downey, CA · No drug or device payments recorded (2025) · (833) 574-2273
Dr. Christopher Gonzalez-erives, MD
Downey, CA · No drug or device payments recorded (2025) · (562) 657-9000
Dr. Christopher Sobowale, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 867-7999
Dr. Dana Dumitru, D.O.
Downey, CA · No drug or device payments recorded (2025) · Telehealth · (562) 657-2354
Dr. Danese Hayes, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 803-0124
Dr. David Chen, MD
Downey, CA · $374 in drug and device payments (2025) · (562) 869-1070
Dr. Dennis Wong
Downey, CA · $36 in drug and device payments (2025) · (562) 401-6260
Dr. Devin Morris, M.S., D.O.
Downey, CA · No drug or device payments recorded (2025) · (562) 904-5000
Dr. Diana Hsu, M.D.
Downey, CA · $26 in drug and device payments (2025) · (562) 861-3111
Dr. Diane Hermiz, DO
Downey, CA · No drug or device payments recorded (2025) · (562) 869-1070
Dr. Domingo Barrientos, M.D.
Downey, CA · $929 in drug and device payments (2025) · (562) 869-1322
Dr. Doralice Ferreira, DO
Downey, CA · No drug or device payments recorded (2025) · (562) 869-1070
Dr. Doris Rivas, M.D.
Downey, CA · No drug or device payments recorded (2025) · (833) 574-2273
Dr. Estefania Maurer Spakowsky
Downey, CA · No drug or device payments recorded (2025) · (562) 923-9414
Dr. Francisco Sapico, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 803-0124
Dr. Ghazaleh Bahrami, M.D
Downey, CA · $42 in drug and device payments (2025) · (562) 869-4497
Dr. Goethe Hsu, M.D.
Downey, CA · $357 in drug and device payments (2025) · (562) 861-3111
Dr. Hassan Chahine, MD
Downey, CA · $75 in drug and device payments (2025) · (866) 333-3158
Dr. Henry Do, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 862-3684

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.