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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. Ridwan Khan, MD
Pasadena, CA · No drug or device payments recorded (2025) · (626) 397-5188
Dr. Robert Cann, M.D.
Pasadena, CA · No drug or device payments recorded (2025) · Telehealth · (626) 568-8184
Dr. Robert Eshbaugh
Pasadena, CA · $1,039 in drug and device payments (2025) · Telehealth · (626) 397-5000
Dr. Robert Ladines, M.D.
Pasadena, CA · No drug or device payments recorded (2025) · (626) 798-1111
Dr. Robert Siew, M.D.
Pasadena, CA · $281 in drug and device payments (2025) · (626) 521-5331
Dr. Ronald Olah, MD
Pasadena, CA · $209 in drug and device payments (2025) · Telehealth · (626) 792-2166
Dr. Rotana Tek, D.O.
Pasadena, CA · $547 in drug and device payments (2025) · Telehealth · (213) 334-4111
Dr. Roy Jackson, M.D.
Pasadena, CA · No drug or device payments recorded (2025) · Telehealth · (626) 792-4185
Dr. Russell Simpson, MD
Pasadena, CA · No drug or device payments recorded (2025) · (626) 308-7513
Dr. Sahniah Siciarz-lambert, M.D.
Pasadena, CA · No drug or device payments recorded (2025) · (626) 440-7001
Dr. Salwa Farag
Pasadena, CA · No drug or device payments recorded (2025) · (626) 795-7556
Dr. Shant Kazazian, M.D.
Pasadena, CA · $33 in drug and device payments (2025) · (626) 352-1444
Dr. Sheila Grammatico, M.D., M.P.H.
Pasadena, CA · $78 in drug and device payments (2025) · Telehealth · (626) 397-5000
Dr. Shunpei Iwata, M.D.
Pasadena, CA · No drug or device payments recorded (2025) · (626) 535-0900
Dr. Sonal Lalwani, M.D.
Pasadena, CA · No drug or device payments recorded (2025) · Telehealth · (626) 799-4194
Dr. Sree Garimella, MD
Pasadena, CA · No drug or device payments recorded (2025) · (626) 795-2244
Dr. Stanley Tu, M.D.
Pasadena, CA · $1,242 in drug and device payments (2025) · Telehealth · (626) 795-1831
Dr. Stuart Miller, MD
Pasadena, CA · $27,946 in drug and device payments (2025) · Telehealth · (626) 792-3141
Dr. Susan Fleischman, M.D.
Pasadena, CA · No drug or device payments recorded (2025) · (310) 403-3235
Dr. Talar Kavafyan
Pasadena, CA · No drug or device payments recorded (2025) · Telehealth · (626) 421-7733
Dr. Taleen Akopian, D.O.
Pasadena, CA · $67 in drug and device payments (2025) · Telehealth · (626) 937-5188
Dr. Thirumala Raju, MD
Pasadena, CA · No drug or device payments recorded (2025) · (626) 795-5118
Dr. Timothy Oh
Pasadena, CA · No drug or device payments recorded (2025) · (626) 397-5188
Dr. Todd Hee, M.D.
Pasadena, CA · No drug or device payments recorded (2025) · (626) 403-4016
Dr. Todd Turner, MD
Pasadena, CA · $186 in drug and device payments (2025) · Telehealth · (626) 792-2166
Dr. Victor Wong, MD
Pasadena, CA · $39 in drug and device payments (2025) · (626) 817-8382
Dr. Warren Brown, M.D.
Pasadena, CA · $20 in drug and device payments (2025) · (626) 355-8595
Dr. Warren Shu, M.D.
Pasadena, CA · No drug or device payments recorded (2025) · (626) 795-2244
Dr. Wei Huang-lee, MD
Pasadena, CA · No drug or device payments recorded (2025) · (626) 792-2166
Dr. Wufaa Alrashid, MD
Pasadena, CA · $14 in drug and device payments (2025) · (626) 449-4438
Dr. Zar Kotlarsic, DO
Pasadena, CA · No drug or device payments recorded (2025) · Telehealth · (800) 233-2771
Dr. Zetha Sovyanhadi, MD
Pasadena, CA · No drug or device payments recorded (2025) · (626) 795-2244
Dr. Boyce Kiger, MD
Paso Robles, CA · No drug or device payments recorded (2025) · (805) 238-2422
Dr. Douglas Shelton, MD
Paso Robles, CA · No drug or device payments recorded (2025) · (805) 704-8801
Dr. Neha Garg, MD
Patterson, CA · No drug or device payments recorded (2025) · (866) 682-4842
Dr. Aung Zin, M.D.
Patton, CA · No drug or device payments recorded (2025) · (909) 425-7679
Dr. Aya Eguchi, M.D.
Patton, CA · $24 in drug and device payments (2025) · (951) 425-7222
Dr. Haroun Mohammed
Patton, CA · No drug or device payments recorded (2025) · (909) 425-7000
Dr. Inderjit Singh, M.D.
Patton, CA · No drug or device payments recorded (2025) · (909) 425-7000
Dr. Kenny Win, M.D.
Patton, CA · No drug or device payments recorded (2025) · (909) 425-7679
Dr. Luzmin Inderias, M.D.
Patton, CA · No drug or device payments recorded (2025) · (909) 425-7679
Dr. Nibonth Viravathana, M.D.
Patton, CA · No drug or device payments recorded (2025) · (909) 425-7679
Dr. Tamseela Awan, M.D.
Patton, CA · No drug or device payments recorded (2025) · (909) 425-7000
Dr. David Terman, M.D.
Pebble Beach, CA · No drug or device payments recorded (2025) · (831) 624-8569
Dr. Eileen Murphy, M.D.
Pebble Beach, CA · No drug or device payments recorded (2025) · (831) 238-1320
Dr. Elisabeth Lernhardt, MD
Penn Valley, CA · No drug or device payments recorded (2025) · (530) 432-1300
Dr. Elizabeth Wobus, MD
Penn Valley, CA · No drug or device payments recorded (2025) · (530) 432-4937
Dr. David Hernandez-rodriguez, MD
Perris, CA · $45 in drug and device payments (2025) · (951) 956-2131
Dr. Efren Rillo
Perris, CA · No drug or device payments recorded (2025) · (951) 943-8081
Dr. Amy Kaelin, MD
Petaluma, CA · No drug or device payments recorded (2025) · (707) 792-6743

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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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.