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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. Sarah Lavery, MD
Riverside, CA · $44 in drug and device payments (2025) · (951) 321-6335
Dr. Sarah Mccorkle
Riverside, CA · No drug or device payments recorded (2025) · (949) 922-5988
Dr. Sarah Rasheed, M.D.
Riverside, CA · No drug or device payments recorded (2025) · (951) 251-7415
Dr. Sarina Doyan, MD
Riverside, CA · No drug or device payments recorded (2025) · Telehealth · (951) 353-5497
Dr. Sejad Al-tahan, DO
Riverside, CA · No drug or device payments recorded (2025) · (951) 774-3050
Dr. Shahram Soltanzadeh, M.D.
Riverside, CA · No drug or device payments recorded (2025) · (909) 353-2000
Dr. Sharon Ing, M.D.
Riverside, CA · No drug or device payments recorded (2025) · (951) 781-7700
Dr. Shelly Thio, MD
Riverside, CA · No drug or device payments recorded (2025) · (909) 353-2000
Dr. Shenghua Lang
Riverside, CA · No drug or device payments recorded (2025) · (951) 353-2000
Dr. Shervin Daneshmand, M.D.
Riverside, CA · No drug or device payments recorded (2025) · (951) 353-2000
Dr. Stephen Colucci, MD
Riverside, CA · $24 in drug and device payments (2025) · (951) 782-3622
Dr. Susan Diethelm, MD
Riverside, CA · No drug or device payments recorded (2025) · (909) 353-2000
Dr. Susan Yoshino, D.O.
Riverside, CA · No drug or device payments recorded (2025) · (951) 358-6057
Dr. Syed Naqvi, MD
Riverside, CA · No drug or device payments recorded (2025) · Telehealth · (951) 466-6628
Dr. Tamara Lynne Aqui, DO
Riverside, CA · $1,668 in drug and device payments (2025) · (951) 788-3274
Dr. Terence Shum, MD
Riverside, CA · No drug or device payments recorded (2025) · (909) 353-2000
Dr. Thanh Hoang, MD
Riverside, CA · $72 in drug and device payments (2025) · (909) 353-2000
Dr. Thomas Chen, M.D.
Riverside, CA · $250 in drug and device payments (2025) · (951) 782-3849
Dr. Thuyvan Nguyen, D.O.
Riverside, CA · No drug or device payments recorded (2025) · (833) 450-5967
Dr. Timothy Collins, DO
Riverside, CA · No drug or device payments recorded (2025) · (951) 788-3000
Dr. Tony Kwon, MD
Riverside, CA · $59 in drug and device payments (2025) · Telehealth · (951) 782-3616
Dr. Tranhoai Nguyen, M.D.
Riverside, CA · $49 in drug and device payments (2025) · (951) 353-2000
Dr. Trinh Tang, MD
Riverside, CA · No drug or device payments recorded (2025) · (951) 248-0073
Dr. Trisha Vu
Riverside, CA · No drug or device payments recorded (2025) · (833) 574-2273
Dr. Tushar Patel, MD
Riverside, CA · No drug or device payments recorded (2025) · (909) 353-2000
Dr. Uju Ezeamama, MD, MSN
Riverside, CA · No drug or device payments recorded (2025) · (951) 781-2200
Dr. Valentine Otuechere, MD., MPH.
Riverside, CA · $939 in drug and device payments (2025) · Telehealth · (951) 343-1616
Dr. Verna Boykin, MD
Riverside, CA · No drug or device payments recorded (2025) · (909) 353-2000
Dr. Victor Laus, M.D.
Riverside, CA · No drug or device payments recorded (2025) · (951) 955-4494
Dr. Vincent Lee, M.D.
Riverside, CA · $227 in drug and device payments (2025) · (714) 676-3880
Dr. Violeta De Jesus, M.D.
Riverside, CA · No drug or device payments recorded (2025)
Dr. Viona Zhang, MD
Riverside, CA · No drug or device payments recorded (2025) · (951) 827-7793
Dr. Virgil Nielsen, MD
Riverside, CA · No drug or device payments recorded (2025) · (909) 353-2000
Dr. Vyacheslav Shvartsman, MD
Riverside, CA · No drug or device payments recorded (2025) · (909) 353-2000
Dr. Waqqas Mirza, MD
Riverside, CA · No drug or device payments recorded (2025) · (951) 466-6628
Dr. Willie Citrin, MD
Riverside, CA · No drug or device payments recorded (2025) · (951) 689-6200
Dr. Xin Zhang, MD
Riverside, CA · $576 in drug and device payments (2025) · Telehealth · (951) 360-5275
Dr. Zainab Ali, M.D.
Riverside, CA · $24 in drug and device payments (2025) · Telehealth · (951) 774-2952
Dr. Zandra Tutt, MD
Riverside, CA · No drug or device payments recorded (2025) · (954) 937-2944
Dr. Zhengran Wang, DO
Riverside, CA · No drug or device payments recorded (2025) · (951) 827-7669
Dr. Chi Van Hoozen, M.D.
Rocklin, CA · No drug or device payments recorded (2025) · (916) 632-8889
Dr. David Patella, M.D.
Rocklin, CA · No drug or device payments recorded (2025) · (916) 624-3358
Dr. Edwin Wong, M.D.
Rocklin, CA · No drug or device payments recorded (2025) · (916) 632-9606
Dr. Hartej Uppal, MD
Rocklin, CA · No drug or device payments recorded (2025) · (916) 538-7272
Dr. Henry Low, MD
Rocklin, CA · No drug or device payments recorded (2025) · (916) 872-3860
Dr. Kuo Ooi, M.D.
Rocklin, CA · $2,138 in drug and device payments (2025) · Telehealth · (916) 624-0300
Dr. Mehak Gulati
Rocklin, CA · $376 in drug and device payments (2025) · (916) 883-3912
Dr. Pamela Mercado, D.O.
Rocklin, CA · No drug or device payments recorded (2025) · (714) 292-6522
Dr. Sanyukta Pawar, M.D.
Rocklin, CA · No drug or device payments recorded (2025) · Telehealth · (916) 295-5700
Dr. Thomas Stafford, M.D.
Rocklin, CA · $226 in drug and device payments (2025) · Telehealth · (916) 624-3500

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.