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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. Robert Anderson, MD
Martinez, CA · No drug or device payments recorded (2025) · (925) 372-1000
Dr. Sara Levin, MD
Martinez, CA · No drug or device payments recorded (2025) · (925) 370-5110
Dr. Sheila Rezaei
Martinez, CA · No drug or device payments recorded (2025) · Telehealth · (925) 372-1000
Dr. Sonia Sutherland
Martinez, CA · No drug or device payments recorded (2025) · (925) 370-5110
Dr. Stephanie Lin
Martinez, CA · No drug or device payments recorded (2025) · (925) 370-5000
Dr. Steven Johnson, MD
Martinez, CA · No drug or device payments recorded (2025) · (925) 372-1000
Dr. Thomas Gamsky, MD
Martinez, CA · No drug or device payments recorded (2025) · (925) 313-1100
Dr. Walter Peters, M.D.
Martinez, CA · No drug or device payments recorded (2025) · (925) 930-3110
Dr. Yelena Gambarin, M.D.
Martinez, CA · No drug or device payments recorded (2025) · (925) 372-2131
Dr. Yu-hung Peng, MD
Martinez, CA · No drug or device payments recorded (2025) · (925) 370-5000
Dr. Baljinder Virdi, MD
Marysville, CA · $55 in drug and device payments (2025) · (530) 749-4697
Dr. Bisrat Woldemichael, MD
Marysville, CA · $124 in drug and device payments (2025) · (530) 749-3242
Dr. Dilip K C
Marysville, CA · No drug or device payments recorded (2025) · (530) 749-4300
Dr. Hari Goyal, M.D.
Marysville, CA · No drug or device payments recorded (2025) · (530) 741-2393
Dr. Jerry Gross, D.O.
Marysville, CA · No drug or device payments recorded (2025) · (530) 741-6245
Dr. Kaumakaokalani Shimatsu, M.D.
Marysville, CA · No drug or device payments recorded (2025) · Telehealth · (530) 749-3242
Dr. Nathan Tang, M.D.
Marysville, CA · No drug or device payments recorded (2025) · (530) 741-2393
Dr. Shalini Gupta, M.D.
Marysville, CA · No drug or device payments recorded (2025) · Telehealth · (530) 741-2393
Dr. Tam Nguyen, D.O.
Marysville, CA · $23 in drug and device payments (2025) · (530) 741-2393
Dr. William Nakashima, MD
Marysville, CA · No drug or device payments recorded (2025) · (530) 741-3688
Dr. Akshay Manek, M. D.
Mather, CA · No drug or device payments recorded (2025) · (916) 843-7104
Dr. Andrew Yen, M.D.
Mather, CA · $247 in drug and device payments (2025) · (916) 366-5339
Dr. Bela Mehra, M.D.
Mather, CA · No drug or device payments recorded (2025) · (916) 366-5450
Dr. Brandan Dotson
Mather, CA · No drug or device payments recorded (2025) · (800) 382-8387
Dr. Bryn Lee Mcghee, M.D.
Mather, CA · No drug or device payments recorded (2025) · (916) 843-7000
Dr. Clement Cheng, M.D.
Mather, CA · No drug or device payments recorded (2025) · (800) 382-8387
Dr. Clifford Fisher, MD
Mather, CA · No drug or device payments recorded (2025) · (800) 382-8387
Dr. Clyve Greaves, M.D.
Mather, CA · No drug or device payments recorded (2025) · (916) 843-9057
Dr. David Siegel, M.D.
Mather, CA · No drug or device payments recorded (2025) · (916) 843-7096
Dr. Dinithi Iddawela, M.D.
Mather, CA · No drug or device payments recorded (2025) · (916) 843-9391
Dr. Dorothea Hoover, MD
Mather, CA · No drug or device payments recorded (2025) · (916) 366-5450
Dr. Eric Johnson, M.D.
Mather, CA · $122 in drug and device payments (2025) · (916) 843-7000
Dr. Griffin Schultz, MD
Mather, CA · No drug or device payments recorded (2025) · (800) 382-8387
Dr. Jaeho Lee, M.D.
Mather, CA · $145 in drug and device payments (2025) · (916) 843-7192
Dr. Kara Gaerlan, MD
Mather, CA · No drug or device payments recorded (2025) · (916) 843-2849
Dr. Leslie Sarna, M.D.
Mather, CA · No drug or device payments recorded (2025) · (916) 843-7000
Dr. Marie Rossi
Mather, CA · No drug or device payments recorded (2025) · (916) 843-9196
Dr. Nilar Soe, M.D.
Mather, CA · No drug or device payments recorded (2025) · (916) 843-2164
Dr. Patrick Chang, MD
Mather, CA · No drug or device payments recorded (2025) · (916) 843-7000
Dr. Peter Wroblicky, M.D.
Mather, CA · No drug or device payments recorded (2025) · (916) 480-0600
Dr. Philip Eulie, M.D.
Mather, CA · No drug or device payments recorded (2025) · (916) 843-9372
Dr. Rajasekar Jagadeesan, M.D.
Mather, CA · No drug or device payments recorded (2025) · (916) 843-7000
Dr. Seema Minhaj, M.D.
Mather, CA · No drug or device payments recorded (2025) · (916) 843-7000
Dr. Sheldon Ball, MD
Mather, CA · $22 in drug and device payments (2025) · (916) 366-5450
Dr. Stephen Aglubat, M.D.
Mather, CA · No drug or device payments recorded (2025) · (916) 843-9054
Dr. Tariq Horani, M.D.
Mather, CA · No drug or device payments recorded (2025) · (916) 843-7000
Dr. Cynthia Alli, M.D.
Mcclellan, CA · No drug or device payments recorded (2025) · (916) 561-7520
Dr. Debra Karling-isaacs, MD
Mcclellan, CA · No drug or device payments recorded (2025) · (916) 561-7491
Dr. Erick Aponte Guzman, M.D.
Mcclellan, CA · No drug or device payments recorded (2025) · (916) 561-7560
Dr. James Ward, M.D.
Mcclellan, CA · No drug or device payments recorded (2025) · Telehealth · (916) 561-7560

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.