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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. Brittney Ulupinar
San Diego, CA · $143 in drug and device payments (2025) · Telehealth · (858) 764-3000
Dr. Bruce Barton, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 232-4311
Dr. Byron Teegarden, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Caldon Haj, MD
San Diego, CA · No drug or device payments recorded (2025) · (773) 828-4310
Dr. Cambiz Baher, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Can Bui, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 563-0567
Dr. Carlos Lago Hernandez, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 543-6463
Dr. Caroline Lin, M.D., M.SC.
San Diego, CA · $15 in drug and device payments (2025) · Telehealth · (619) 221-5903
Dr. Carrie Cardenas, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (619) 819-7227
Dr. Catherine Carroll, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 554-1212
Dr. Catherine Goff, MD, MPH
San Diego, CA · No drug or device payments recorded (2025) · (858) 281-5106
Dr. Catherine Kay, DO
San Diego, CA · No drug or device payments recorded (2025) · (402) 617-3577
Dr. Charles Ginsberg, M.D.
San Diego, CA · $9,312 in drug and device payments (2025) · Telehealth · (619) 543-4619
Dr. Charles Goldberg, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 552-8585
Dr. Charles Hamori, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Charles Hergesheimer, M.D.
San Diego, CA · $24 in drug and device payments (2025) · Telehealth · (800) 926-8273
Dr. Charmaine Gutjahr, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 859-1188
Dr. Chatrathip Nasongkla, DO
San Diego, CA · No drug or device payments recorded (2025) · (619) 227-1710
Dr. Christian Ramers, MD
San Diego, CA · $203 in drug and device payments (2025) · (619) 515-2545
Dr. Christina Mansour, MD
San Diego, CA · $728 in drug and device payments (2025) · (619) 260-7220
Dr. Christina Schultz, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (800) 926-8273
Dr. Christina Wu, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 543-6268
Dr. Christine Perry, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 552-8585
Dr. Christine Wang, M.D.
San Diego, CA · $362 in drug and device payments (2025) · Telehealth · (858) 764-3000
Dr. Christopher Abbott, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (314) 387-5763
Dr. Christopher Fields, MD
San Diego, CA · No drug or device payments recorded (2025) · (833) 574-2273
Dr. Christopher Holt, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 516-8931
Dr. Christopher Hunt, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 279-1212
Dr. Christopher Olonan, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 688-9000
Dr. Chuchu Liu, DO
San Diego, CA · No drug or device payments recorded (2025) · (646) 525-0595
Dr. Cindy Tsai, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 232-3500
Dr. Claudia Ramirez Sanchez, M.D.
San Diego, CA · $244 in drug and device payments (2025) · (800) 926-8273
Dr. Claudio Zawitkowski, M.D.,
San Diego, CA · No drug or device payments recorded (2025) · (619) 260-1958
Dr. Cody Delaney
San Diego, CA · $21 in drug and device payments (2025) · (619) 260-7220
Dr. Colleen Boyle, MD
San Diego, CA · $110 in drug and device payments (2025) · (619) 532-9725
Dr. Conyee Lim, M.D.C.M.
San Diego, CA · No drug or device payments recorded (2025) · (858) 395-3183
Dr. Corinne Yarbrough, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (858) 499-2600
Dr. Courtney Keilman, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 543-6268
Dr. Courtney Konchan, DO
San Diego, CA · No drug or device payments recorded (2025) · (800) 926-8273
Dr. Courtney O'rourke, DO
San Diego, CA · $465 in drug and device payments (2025) · Telehealth · (858) 554-1212
Dr. Cristina Rivera, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 939-3400
Dr. Crystal Wiley Cene, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (800) 926-8273
Dr. Cynthia Lin, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (858) 499-2600
Dr. Cynthia Sorrell, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Dalia Elias, MD
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (800) 926-8273
Dr. Dalia Hunt, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 279-9676
Dr. Dana Mourad, MD
San Diego, CA · $40 in drug and device payments (2025) · (858) 554-7272
Dr. Daniel Bressler, M.D.
San Diego, CA · $14 in drug and device payments (2025) · (760) 299-2570
Dr. Daniel Corbally
San Diego, CA · No drug or device payments recorded (2025) · (619) 543-6268
Dr. Daniel Flaherty, DO
San Diego, CA · No drug or device payments recorded (2025) · (619) 294-8111

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.