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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. Ricardo Noceda, MD
Anaheim, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Richard Hughes, M.D.
Anaheim, CA · No drug or device payments recorded (2025) · (714) 630-6363
Dr. Rickinder Grewal, MD
Anaheim, CA · $33 in drug and device payments (2025) · (888) 988-2800
Dr. Robert Dolin, MD
Anaheim, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Rodolfo Villicana, MD
Anaheim, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Rosalia Osias, M.D.
Anaheim, CA · $50 in drug and device payments (2025) · Telehealth · (714) 723-0787
Dr. Rosalinda Loza, M.D.
Anaheim, CA · No drug or device payments recorded (2025) · (714) 952-9553
Dr. Ruben Chin, M.D.
Anaheim, CA · $1,560 in drug and device payments (2025) · (714) 776-7006
Dr. Ryann Ahern, M.D.
Anaheim, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Saeed Torabzadeh, MD
Anaheim, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Sajini George, MD
Anaheim, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Sampath Suryadevara, M.D.
Anaheim, CA · No drug or device payments recorded (2025) · (714) 520-3000
Dr. Samuel Cho, MD
Anaheim, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Samuel Costantini, MD
Anaheim, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Sarah Lee-bui, DO
Anaheim, CA · No drug or device payments recorded (2025) · (714) 387-0347
Dr. Scott Tran, M.D.
Anaheim, CA · $260 in drug and device payments (2025) · (714) 534-4001
Dr. Selma Prechel, OD
Anaheim, CA · $460 in drug and device payments (2025) · (714) 995-7503
Dr. Sharma Bishop, M.D
Anaheim, CA · $48 in drug and device payments (2025) · (714) 517-2100
Dr. Sharon Herdan, M.D.
Anaheim, CA · No drug or device payments recorded (2025) · (714) 998-6871
Dr. Shelly Rimler, M.D.
Anaheim, CA · No drug or device payments recorded (2025) · (714) 644-2210
Dr. Shih Tang, M.D.
Anaheim, CA · No drug or device payments recorded (2025) · (714) 776-7006
Dr. Shima Radjabian, MD
Anaheim, CA · No drug or device payments recorded (2025) · (714) 995-1000
Dr. Soomin Kim, MD
Anaheim, CA · $122 in drug and device payments (2025) · (714) 644-2000
Dr. Srikrishna Chundru, MD
Anaheim, CA · $15 in drug and device payments (2025) · (714) 520-3000
Dr. Srilakshmi Moturu, MD
Anaheim, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Sri Wijegoonaratna, M.D
Anaheim, CA · No drug or device payments recorded (2025) · (714) 873-3559
Dr. Stanley Ermshar, MD
Anaheim, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Steven Arabo, MD
Anaheim, CA · No drug or device payments recorded (2025) · (714) 399-9222
Dr. Steve Sitar, M.D
Anaheim, CA · $2,335 in drug and device payments (2025) · (714) 817-7878
Dr. Sultan Shah, M.D.
Anaheim, CA · No drug or device payments recorded (2025) · (714) 533-4511
Dr. Susan Strodtbeck, MD
Anaheim, CA · No drug or device payments recorded (2025) · (714) 517-2100
Dr. Tal Do, MD
Anaheim, CA · No drug or device payments recorded (2025) · (714) 772-8282
Dr. Tanmai Saxena, M.D., PH.D.
Anaheim, CA · No drug or device payments recorded (2025) · (714) 644-2000
Dr. Tanveer Hussain, MD
Anaheim, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Theodore Lee, MD
Anaheim, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Theodore Nguyen, MD
Anaheim, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Thi Bich Ngoc Mai, MD
Anaheim, CA · No drug or device payments recorded (2025) · (714) 254-2747
Dr. Thira Kunakorn, MD
Anaheim, CA · No drug or device payments recorded (2025) · (714) 776-6930
Dr. Thu-nga Tran, MD
Anaheim, CA · No drug or device payments recorded (2025) · Telehealth · (888) 988-2800
Dr. Tieu Phung, M.D.
Anaheim, CA · No drug or device payments recorded (2025) · (714) 734-5500
Dr. Tim Yanni, DO
Anaheim, CA · $38 in drug and device payments (2025) · Telehealth · (714) 826-1200
Dr. Trang Nguyen, MD
Anaheim, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Tuan Nguyen, MD
Anaheim, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Usha Iyer, MD
Anaheim, CA · No drug or device payments recorded (2025) · (714) 533-1703
Dr. Viet Tran, D.O.
Anaheim, CA · No drug or device payments recorded (2025) · (714) 644-2000
Dr. Vincent Chiu, PHD MD
Anaheim, CA · No drug or device payments recorded (2025) · (714) 527-6363
Dr. Vu Truong, MD
Anaheim, CA · $250 in drug and device payments (2025) · (714) 491-9022
Dr. Wei Tang, M.D.
Anaheim, CA · No drug or device payments recorded (2025) · (714) 254-2731
Dr. Wesley Chang, M.D.
Anaheim, CA · No drug or device payments recorded (2025) · (714) 974-8130
Dr. Won Kim, M.D.
Anaheim, CA · No drug or device payments recorded (2025) · (714) 638-1347

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.