HealthcareDiscovery.AI / Doctors / California / Internal Medicine

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. Michael Salzle
Laguna Hills, CA · $592 in drug and device payments (2025) · (949) 939-3756
Dr. Mozhgan Ashtari, M.D.
Laguna Hills, CA · $496 in drug and device payments (2025) · Telehealth · (949) 600-6334
Dr. Nermine Morcos-clark, MD
Laguna Hills, CA · $175 in drug and device payments (2025) · (949) 588-7262
Dr. Owrang Dastmalchi, D.O.
Laguna Hills, CA · $472 in drug and device payments (2025) · (949) 215-5055
Dr. Patrick Chaipat, M.D.
Laguna Hills, CA · No drug or device payments recorded (2025) · (949) 855-1158
Dr. Paul Bixenstine, MD
Laguna Hills, CA · $109 in drug and device payments (2025) · (949) 366-1053
Dr. Paul Cassedy, M.D.
Laguna Hills, CA · $114 in drug and device payments (2025) · Telehealth · (949) 707-0005
Dr. Paul Strodtbeck, M. D.
Laguna Hills, CA · No drug or device payments recorded (2025) · (949) 373-7799
Dr. Pedram Ansari Pirsaraei, M.D.
Laguna Hills, CA · $415 in drug and device payments (2025) · (949) 799-4786
Dr. Piyanetr Sukhu, M.D.
Laguna Hills, CA · No drug or device payments recorded (2025) · (949) 951-7808
Dr. Ralph Cummings, MD
Laguna Hills, CA · No drug or device payments recorded (2025) · (949) 859-4433
Dr. Raymond Fernandez, MD
Laguna Hills, CA · No drug or device payments recorded (2025) · (949) 465-8155
Dr. Reza Govashiri, M.D.
Laguna Hills, CA · $601 in drug and device payments (2025) · Telehealth · (949) 830-4201
Dr. Richard Greengold, M.D.
Laguna Hills, CA · $102 in drug and device payments (2025) · (949) 770-2080
Dr. Robert Lazatin, M.D.
Laguna Hills, CA · No drug or device payments recorded (2025) · (949) 768-4850
Dr. Stefan Frolov, MD
Laguna Hills, CA · No drug or device payments recorded (2025) · (949) 452-3021
Dr. Teneese Nguyen, MD.
Laguna Hills, CA · No drug or device payments recorded (2025) · (949) 215-5055
Dr. Tracy Siegfried, M.D.
Laguna Hills, CA · No drug or device payments recorded (2025) · Telehealth · (949) 716-0833
Dr. Trevor Dunbar
Laguna Hills, CA · $731 in drug and device payments (2025) · (949) 448-0656
Dr. Wesley Babaran, M.D.
Laguna Hills, CA · $23 in drug and device payments (2025) · Telehealth · (949) 588-5700
Dr. William Davies, M.D.
Laguna Hills, CA · No drug or device payments recorded (2025) · (949) 770-2763
Dr. Yama Afshar, DO, MPH
Laguna Hills, CA · $1,434 in drug and device payments (2025) · Telehealth · (949) 204-3006
Dr. Yaseen Kady, PA-C
Laguna Hills, CA · $6,385 in drug and device payments (2025) · Telehealth · (949) 916-9100
Dr. Yong-sik Kim, MD
Laguna Hills, CA · No drug or device payments recorded (2025) · Telehealth · (949) 334-8270
Dr. Daniel Sterns, M.D.
Laguna Hillsq, CA · $57 in drug and device payments (2025) · Telehealth · (949) 373-7799
Dr. Bassam Bilal, M.D.
Laguna Niguel, CA · $1,111 in drug and device payments (2025) · Telehealth · (702) 579-3203
Dr. Erin Parise, MD
Laguna Niguel, CA · No drug or device payments recorded (2025) · (949) 495-7144
Dr. Parisa Mortaji, MD
Laguna Niguel, CA · $940 in drug and device payments (2025) · Telehealth · (949) 495-7144
Dr. Peter Jungwirth, M.D.
Laguna Niguel, CA · No drug or device payments recorded (2025) · (949) 495-4524
Dr. Sonja Krafcik, MD
Laguna Niguel, CA · No drug or device payments recorded (2025) · Telehealth · (949) 831-3686
Dr. Susan Dindot, MD
Laguna Niguel, CA · $330 in drug and device payments (2025) · Telehealth · (949) 249-9600
Dr. Vincent Duda, MD
Laguna Niguel, CA · No drug or device payments recorded (2025) · (949) 495-7144
Dr. Zahra Shahim, MD
Laguna Niguel, CA · $420 in drug and device payments (2025) · Telehealth · (949) 363-9595
Dr. James Lee, M.D.
Laguna Woods, CA · No drug or device payments recorded (2025) · (657) 241-8455
Dr. Kien-an Duong, MD
Laguna Woods, CA · $395 in drug and device payments (2025) · Telehealth · (657) 241-8455
Dr. Susan Grenz, MD
Laguna Woods, CA · No drug or device payments recorded (2025) · (727) 798-6640
Dr. John Geier, MD
Lagung Hills, CA · No drug or device payments recorded (2025) · (949) 452-7710
Dr. Daniel Uribe, MD
La Habra, CA · No drug or device payments recorded (2025) · (562) 691-0811
Dr. Frances Gerard Genil, MD
La Habra, CA · No drug or device payments recorded (2025) · (562) 690-0400
Dr. Kavosh Rahimi, MD
La Habra, CA · No drug or device payments recorded (2025) · (562) 690-0400
Dr. Kevin Gan
La Habra, CA · No drug or device payments recorded (2025) · (562) 690-0400
Dr. Maryam Haghnegahdar, MD
La Habra, CA · $959 in drug and device payments (2025) · (562) 690-0400
Dr. Mehran Rouhani Sisan, M.D.
La Habra, CA · $380 in drug and device payments (2025) · (562) 690-0400
Dr. Minh Trang Tran, MD
La Habra, CA · $293 in drug and device payments (2025) · Telehealth · (562) 697-6030
Dr. Shubhangi Godbole, M.D.
La Habra, CA · No drug or device payments recorded (2025) · (562) 690-0400
Dr. Simon Baek, M.D.
La Habra, CA · No drug or device payments recorded (2025) · Telehealth · (562) 690-5502
Dr. Abha Singh, M.B., B.S.
La Jolla, CA · No drug or device payments recorded (2025) · (858) 657-6110
Dr. Abhishek Gadre, MD
La Jolla, CA · $913 in drug and device payments (2025) · Telehealth · (858) 657-7118
Dr. Adva Kornblit, M.D.
La Jolla, CA · $327 in drug and device payments (2025) · Telehealth · (858) 554-7225
Dr. Alan Beneze, MD
La Jolla, CA · No drug or device payments recorded (2025) · (858) 554-3200

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

Related

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.