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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. Kenneth Tuong Truong, D.O..
Union City, CA · No drug or device payments recorded (2025) · Telehealth · (510) 441-8600
Dr. Lauren Yokomizo
Union City, CA · No drug or device payments recorded (2025) · (212) 263-5506
Dr. Lolita Chiong, M.D.
Union City, CA · No drug or device payments recorded (2025) · (510) 487-4400
Dr. Marcia Li, M.D.
Union City, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Michael Fong, M.D.
Union City, CA · $44 in drug and device payments (2025) · (510) 454-1000
Dr. Michael Olalia, M.D.
Union City, CA · No drug or device payments recorded (2025) · Telehealth · (510) 602-5034
Dr. Milton Chan, D.O.
Union City, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Muhammad Aleem, M.D.
Union City, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Muniba Mohammed, M.D.
Union City, CA · No drug or device payments recorded (2025) · Telehealth · (510) 675-4010
Dr. Nefissa Chambi, M.D.
Union City, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Pamela Nitsos, M.D.
Union City, CA · No drug or device payments recorded (2025) · Telehealth · (510) 454-1000
Dr. Preeti Sharma, M.D.
Union City, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Rajvir Shahi, MD
Union City, CA · No drug or device payments recorded (2025) · Telehealth · (510) 248-1500
Dr. Richa Handa, MD
Union City, CA · No drug or device payments recorded (2025) · Telehealth · (510) 675-4010
Dr. Saba Arshad, M.D.
Union City, CA · No drug or device payments recorded (2025) · (510) 600-4079
Dr. Sabine Hill, D.O.
Union City, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Scott Sullivan, M.D.
Union City, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Steven Lee, DO
Union City, CA · $32 in drug and device payments (2025) · (510) 675-4010
Dr. Vanaja Chilukuri, M.D.
Union City, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Vijaya Basawaprasad, M.D.
Union City, CA · No drug or device payments recorded (2025) · Telehealth · (510) 454-1000
Dr. Wendy Lee, M.D.
Union City, CA · No drug or device payments recorded (2025) · Telehealth · (510) 784-4000
Dr. Wilma Yaung, M.D.
Union City, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Yasmeen Haq, MD
Union City, CA · No drug or device payments recorded (2025) · (510) 471-5907
Dr. Ahmed Al-waisi
Upland, CA · No drug or device payments recorded (2025) · (909) 985-2811
Dr. Azhar Majeed, MD, MBA, FACP
Upland, CA · $237 in drug and device payments (2025) · (909) 524-1940
Dr. Bhupal Kommineni, MD FACP
Upland, CA · No drug or device payments recorded (2025) · (909) 981-0989
Dr. Briannah Wade, MD
Upland, CA · No drug or device payments recorded (2025) · (909) 985-2811
Dr. Cynthia Serabyn, DO
Upland, CA · No drug or device payments recorded (2025) · (909) 946-5348
Dr. David Engelhardt, M.D.
Upland, CA · No drug or device payments recorded (2025) · (909) 931-3838
Dr. David Tran, M.D.
Upland, CA · No drug or device payments recorded (2025) · (909) 985-1908
Dr. Decerie Dayag, MD
Upland, CA · $172 in drug and device payments (2025) · (909) 985-0883
Dr. Ghassan Hadi, M.D.
Upland, CA · $390 in drug and device payments (2025) · Telehealth · (909) 981-8904
Dr. Ivan Leroux, MD
Upland, CA · No drug or device payments recorded (2025) · (800) 213-8517
Dr. Johnny Choi, M.D.
Upland, CA · $156 in drug and device payments (2025) · (909) 296-8800
Dr. Michael Chai, M.D.
Upland, CA · $1,180 in drug and device payments (2025) · Telehealth · (909) 920-6698
Dr. Michael Creagan, MD
Upland, CA · No drug or device payments recorded (2025) · (909) 985-0732
Dr. Nahel Al Bouz, M.D.
Upland, CA · $590 in drug and device payments (2025) · Telehealth · (909) 581-6420
Dr. Sadia Moinuddin, MD
Upland, CA · No drug or device payments recorded (2025) · Telehealth · (909) 579-6753
Dr. Samish Patel, M.D.
Upland, CA · No drug or device payments recorded (2025) · (909) 931-4034
Dr. Sarina Kular, M.D.
Upland, CA · $34 in drug and device payments (2025) · Telehealth · (909) 982-4000
Dr. Susan Biegel, M.D.
Upland, CA · $1,473 in drug and device payments (2025) · Telehealth · (909) 985-1908
Dr. Tejinder Singh, MD
Upland, CA · $14 in drug and device payments (2025) · (909) 982-8944
Dr. Wilson Lao, MD
Upland, CA · $19 in drug and device payments (2025) · (909) 946-5348
Dr. Ali Hassani, MD
Vacaville, CA · $136 in drug and device payments (2025) · Telehealth · (707) 624-7500
Dr. Andleeb Judge, M.D.
Vacaville, CA · $28 in drug and device payments (2025) · Telehealth · (707) 454-5800
Dr. Angeli Duran, MD, DO
Vacaville, CA · $28 in drug and device payments (2025) · Telehealth · (707) 427-4900
Dr. Anne Chen, M.D.
Vacaville, CA · No drug or device payments recorded (2025) · Telehealth · (707) 427-4900
Dr. Aurora Haworth, M.D.
Vacaville, CA · No drug or device payments recorded (2025) · (707) 447-4362
Dr. Bethlehem Haile, M.D
Vacaville, CA · No drug or device payments recorded (2025) · (707) 453-7007
Dr. Daniel Scotti, M.D.
Vacaville, CA · No drug or device payments recorded (2025) · (707) 455-0302

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.