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. Joseph Czvik, MD
San Marcos, CA · $356 in drug and device payments (2025) · (760) 471-1020
Dr. Justin Charles, MD
San Marcos, CA · $567 in drug and device payments (2025) · Telehealth · (442) 372-2330
Dr. Kathryn Germeraad, DO
San Marcos, CA · No drug or device payments recorded (2025) · Telehealth · (858) 554-1212
Dr. Lauren Clarine, D.O.
San Marcos, CA · No drug or device payments recorded (2025) · (877) 236-0333
Dr. Lauren Jefferis, MD
San Marcos, CA · No drug or device payments recorded (2025) · (760) 736-6700
Dr. Marie Russell, MD.
San Marcos, CA · $141 in drug and device payments (2025) · (760) 736-8689
Dr. Meenu Bawa, M.D
San Marcos, CA · No drug or device payments recorded (2025) · Telehealth · (619) 323-8789
Dr. Minh Nguyen, M.D.
San Marcos, CA · $22 in drug and device payments (2025) · (619) 757-0141
Dr. Mona Arasoghli, M.D.
San Marcos, CA · No drug or device payments recorded (2025) · (800) 290-5000
Dr. Samuel Poniachik, M.D
San Marcos, CA · $546 in drug and device payments (2025) · (760) 736-6700
Dr. Shreya Chandra, MD
San Marcos, CA · No drug or device payments recorded (2025) · (760) 736-6700
Dr. Sze Hoay Ding, M.D.
San Marcos, CA · No drug or device payments recorded (2025) · (619) 318-7476
Dr. Tina Tran, MD
San Marcos, CA · $42 in drug and device payments (2025) · Telehealth · (760) 806-5700
Dr. Tyler Sprague, D.O.
San Marcos, CA · No drug or device payments recorded (2025) · Telehealth · (760) 304-1383
Dr. Chien Fang, MD
San Marino, CA · No drug or device payments recorded (2025) · Telehealth · (626) 441-4231
Dr. Derek Cheung, MD
San Marino, CA · No drug or device payments recorded (2025) · (626) 441-4231
Dr. Elisa Alvarado, M.D.
San Marino, CA · $60 in drug and device payments (2025) · (626) 584-0026
Dr. John Wear
San Marino, CA · No drug or device payments recorded (2025) · Telehealth · (626) 441-4231
Dr. Mu-chien Chiang, D.O.
San Marino, CA · $639 in drug and device payments (2025) · Telehealth · (626) 441-4231
Dr. Richard Williams, MD
San Marino, CA · No drug or device payments recorded (2025) · (626) 441-4231
Dr. Sabrina Hong, MD
San Marino, CA · No drug or device payments recorded (2025) · (626) 354-4058
Dr. Samuel Zia, M.D.
San Marino, CA · No drug or device payments recorded (2025) · (626) 282-5055
Dr. Sonya Ehresmann, M.D.
San Marino, CA · No drug or device payments recorded (2025) · Telehealth · (626) 441-4231
Dr. Thomas Maxwell, M.D.
San Marino, CA · $42 in drug and device payments (2025) · (626) 449-2455
Dr. Ya-gin Hanna Huang, MD
San Marino, CA · No drug or device payments recorded (2025) · Telehealth · (626) 441-4231
Dr. Alpa Sanghavi, M.D.
San Mateo, CA · No drug or device payments recorded (2025) · (650) 573-2120
Dr. Amy Daniher, M.D.
San Mateo, CA · No drug or device payments recorded (2025) · (650) 696-5851
Dr. Anoop Neboori, M.D.
San Mateo, CA · No drug or device payments recorded (2025) · Telehealth · (650) 652-8500
Dr. Beatty Ramsay, MD
San Mateo, CA · No drug or device payments recorded (2025) · (650) 347-0063
Dr. Chester Kunnappilly, MD
San Mateo, CA · No drug or device payments recorded (2025) · (650) 573-2222
Dr. Dale Ritzo, M.D.
San Mateo, CA · No drug or device payments recorded (2025) · (650) 343-4003
Dr. Davida Talcove, MD
San Mateo, CA · No drug or device payments recorded (2025) · (650) 573-2222
Dr. Diane Oliver, MD
San Mateo, CA · $216 in drug and device payments (2025) · (650) 906-1544
Dr. Dina Sverdlov, MD
San Mateo, CA · $1,683 in drug and device payments (2025) · (650) 343-8512
Dr. Edward Juhn, M.D.
San Mateo, CA · No drug or device payments recorded (2025) · (650) 696-4427
Dr. Evelyn Haddad, M.D.
San Mateo, CA · No drug or device payments recorded (2025) · (650) 573-2780
Dr. Frank Tortorice, M.D.
San Mateo, CA · $277 in drug and device payments (2025) · Telehealth · (650) 692-7545
Dr. Gary Pasternak, MD
San Mateo, CA · No drug or device payments recorded (2025) · (650) 554-1000
Dr. Grace Hassid, MD
San Mateo, CA · No drug or device payments recorded (2025) · (650) 573-2222
Dr. Hema Shah, MD
San Mateo, CA · No drug or device payments recorded (2025) · Telehealth · (650) 347-6829
Dr. Hoa Le, MD
San Mateo, CA · No drug or device payments recorded (2025) · Telehealth · (650) 347-0063
Dr. Ian Lin, MD
San Mateo, CA · No drug or device payments recorded (2025) · (650) 524-1925
Dr. Indu Fotedar, MD
San Mateo, CA · No drug or device payments recorded (2025) · (650) 573-2426
Dr. Jack Bernstein, MD
San Mateo, CA · No drug or device payments recorded (2025) · (650) 942-7071
Dr. Jagruti Shukla, MD
San Mateo, CA · No drug or device payments recorded (2025) · (650) 573-2222
Dr. Jennifer Lin, MD
San Mateo, CA · No drug or device payments recorded (2025) · (650) 573-2385
Dr. June-ho Kim, M.D.
San Mateo, CA · $12 in drug and device payments (2025) · Telehealth · (888) 663-6331
Dr. Lily Enayati, MD
San Mateo, CA · $650 in drug and device payments (2025) · Telehealth · (650) 342-2974
Dr. Mary Dobbins, M.D.
San Mateo, CA · $23 in drug and device payments (2025) · (650) 348-6220
Dr. Melissa Nasiruddin
San Mateo, CA · No drug or device payments recorded (2025) · (408) 828-9673

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.