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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. Elizabeth Nieto, M.D.
Mission Viejo, CA · $151 in drug and device payments (2025) · (949) 364-6000
Dr. Eric Benner, M.D.
Mission Viejo, CA · $321 in drug and device payments (2025) · Telehealth · (949) 364-6000
Dr. Erik Finlayson, M.D.
Mission Viejo, CA · No drug or device payments recorded (2025) · (949) 365-2444
Dr. Faramarz Kardan, M.D.
Mission Viejo, CA · No drug or device payments recorded (2025) · (949) 364-1400
Dr. Farnoosh Yari, M.D.
Mission Viejo, CA · No drug or device payments recorded (2025) · (949) 521-8215
Dr. Gary Sugarman, M.D.
Mission Viejo, CA · No drug or device payments recorded (2025) · (949) 582-5430
Dr. Gerald Sugino, M.D.
Mission Viejo, CA · $235 in drug and device payments (2025) · (949) 365-2444
Dr. Gregory Joy, MD
Mission Viejo, CA · No drug or device payments recorded (2025) · (949) 582-5430
Dr. Helen Chang, MD
Mission Viejo, CA · No drug or device payments recorded (2025) · (949) 588-0051
Dr. Huan Guu, M.D.
Mission Viejo, CA · No drug or device payments recorded (2025) · (949) 364-1400
Dr. Jae Choi, MD
Mission Viejo, CA · No drug or device payments recorded (2025) · (949) 364-6000
Dr. James Scheppach, M.D.
Mission Viejo, CA · No drug or device payments recorded (2025) · (949) 364-6000
Dr. Janet Yazdi, M.D.
Mission Viejo, CA · $435 in drug and device payments (2025) · Telehealth · (949) 364-6000
Dr. Joe Nguyen, M.D.
Mission Viejo, CA · $61 in drug and device payments (2025) · Telehealth · (949) 364-6000
Dr. Joshua Sugino, DO
Mission Viejo, CA · $572 in drug and device payments (2025) · Telehealth · (949) 364-6000
Dr. Katherine Manasson, M.D.
Mission Viejo, CA · $148 in drug and device payments (2025) · (949) 348-1085
Dr. Kelly Fordyce, M.D.
Mission Viejo, CA · $723 in drug and device payments (2025) · Telehealth · (949) 364-6000
Dr. Konstantinos Melahoures, M.D.
Mission Viejo, CA · $868 in drug and device payments (2025) · (949) 951-7111
Dr. Kuang Cheng Chen, DO
Mission Viejo, CA · No drug or device payments recorded (2025) · (949) 866-3600
Dr. Leslie Lu, MD
Mission Viejo, CA · $352 in drug and device payments (2025) · Telehealth · (949) 364-6000
Dr. Maria Savitt, MD
Mission Viejo, CA · $152 in drug and device payments (2025) · Telehealth · (949) 364-6000
Dr. Mark Hauptman, M.D.
Mission Viejo, CA · No drug or device payments recorded (2025) · (949) 582-5430
Dr. Mehrnaz Badie, M.D.
Mission Viejo, CA · No drug or device payments recorded (2025) · Telehealth · (949) 364-6000
Dr. Michael Morris, MD
Mission Viejo, CA · $120 in drug and device payments (2025) · (949) 347-6044
Dr. Michele Staunton, M.D.
Mission Viejo, CA · No drug or device payments recorded (2025) · Telehealth · (949) 364-6000
Dr. Mon-ta Tsai, M.D.
Mission Viejo, CA · No drug or device payments recorded (2025) · (949) 588-0051
Dr. Murray Margolis, M.D.
Mission Viejo, CA · No drug or device payments recorded (2025) · (949) 364-6000
Dr. Nader Noorian, M.D.
Mission Viejo, CA · $8,122 in drug and device payments (2025) · Telehealth · (949) 364-6000
Dr. Nina Swadener, MD
Mission Viejo, CA · $889 in drug and device payments (2025) · Telehealth · (949) 364-6559
Dr. Pardise Moraghebi, M.D.
Mission Viejo, CA · $485 in drug and device payments (2025) · Telehealth · (949) 364-6000
Dr. Rajive Zachariah, M.D.
Mission Viejo, CA · No drug or device payments recorded (2025) · Telehealth · (949) 364-6000
Dr. Raymond Kwa, M.D.
Mission Viejo, CA · $329 in drug and device payments (2025) · (949) 364-6000
Dr. Reza Allamehzadeh, M.D
Mission Viejo, CA · $133 in drug and device payments (2025) · Telehealth · (949) 581-2002
Dr. Richard Ulene, M.D.
Mission Viejo, CA · No drug or device payments recorded (2025) · (949) 600-8385
Dr. Ronnie Dawood, M.D.
Mission Viejo, CA · $2,903 in drug and device payments (2025) · (949) 367-1115
Dr. Saba Akhtar, M.D
Mission Viejo, CA · $473 in drug and device payments (2025) · Telehealth · (949) 364-6000
Dr. Saghi Rokhshadfar, MD
Mission Viejo, CA · $94 in drug and device payments (2025) · Telehealth · (949) 583-1600
Dr. Samir Ahmad, M.D
Mission Viejo, CA · $42 in drug and device payments (2025) · (949) 866-3600
Dr. Sarah Pace, MD, MPH
Mission Viejo, CA · $947 in drug and device payments (2025) · Telehealth · (949) 364-6000
Dr. Sherif El Sokkary, M.D.
Mission Viejo, CA · $70 in drug and device payments (2025) · (949) 364-6000
Dr. Vrinda Bhasin, M.D.
Mission Viejo, CA · $2,276 in drug and device payments (2025) · Telehealth · (949) 365-2387
Dr. Vy Nguyen, M.D.
Mission Viejo, CA · $1,599 in drug and device payments (2025) · Telehealth · (949) 364-6000
Dr. Abel Ketema, MD
Modesto, CA · No drug or device payments recorded (2025) · (833) 573-2336
Dr. Abraham Montano, MD
Modesto, CA · $109 in drug and device payments (2025) · Telehealth · (209) 572-5906
Dr. Akash Patel, DO
Modesto, CA · $248 in drug and device payments (2025) · (209) 569-7408
Dr. Amandeep Kaur, MD
Modesto, CA · No drug or device payments recorded (2025) · (209) 576-3525
Dr. Amanpreet Grewal
Modesto, CA · No drug or device payments recorded (2025) · (209) 569-7408
Dr. Anita Prabhu, M.D
Modesto, CA · No drug or device payments recorded (2025) · (209) 557-6200
Dr. Arun Kulthia, M.D.
Modesto, CA · $17 in drug and device payments (2025) · (209) 521-6097
Dr. Aung Oo, M.D
Modesto, CA · No drug or device payments recorded (2025) · Telehealth · (209) 524-1211

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.