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. Neil Melnick, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 353-6817
Dr. Neil Solomon, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 740-9748
Dr. Nellya Vayngortin, MD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 833-2000
Dr. Nicholas Deslauriers, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 476-9363
Dr. Nicholas Iverson, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (628) 206-2356
Dr. Nicholas Kwaan, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 353-2961
Dr. Nicholas Stine, MD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 947-3096
Dr. Nicole Appelle, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 516-0991
Dr. Nikola Bukurov, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 933-8266
Dr. Nima Afshar, MD
San Francisco, CA · $23 in drug and device payments (2025) · (415) 830-3090
Dr. Nina Shah, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-9364
Dr. Nisha Patel, D.O.
San Francisco, CA · No drug or device payments recorded (2025) · (831) 484-7713
Dr. Nishith Singh, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 531-9047
Dr. Nitin Egbert, MD
San Francisco, CA · No drug or device payments recorded (2025) · (408) 439-5083
Dr. Noa Simchoni, M.D., PH.D.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 476-1000
Dr. Olivia Glatt, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 476-1000
Dr. Olivia Harden, MD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (803) 212-8740
Dr. Omid Shah, MBCHB
San Francisco, CA · No drug or device payments recorded (2025) · (415) 476-7931
Dr. Oren Rosenberg
San Francisco, CA · No drug or device payments recorded (2025) · (415) 353-2626
Dr. Orlando Zepeda, MD
San Francisco, CA · No drug or device payments recorded (2025) · (628) 242-6508
Dr. Ovidiu Dumitrescu, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 600-6000
Dr. Owen Huang, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 476-7931
Dr. Pamela Ling, MD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-4624
Dr. Pansy Fong, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 833-2000
Dr. Pao-ching Wang, M.D.
San Francisco, CA · $78 in drug and device payments (2025) · (415) 391-9686
Dr. Parvin Peddi, MD
San Francisco, CA · $30 in drug and device payments (2025) · (415) 221-4810
Dr. Patricia Hume, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 673-9511
Dr. Patrick Sanger, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 580-0855
Dr. Patrick Scannon, MD
San Francisco, CA · No drug or device payments recorded (2025) · (510) 599-2538
Dr. Patrixia Keith Dela Cruz, MD
San Francisco, CA · $144 in drug and device payments (2025) · Telehealth · (415) 476-7500
Dr. Paul Adler, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 833-2200
Dr. Paula Lum, M.D., M.P.H.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 206-2400
Dr. Paul Blanc, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 353-2961
Dr. Paul Frohna, MD, PHD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 487-1552
Dr. Paul Heineken, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 221-4810
Dr. Paul Krezanoski, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (628) 206-8000
Dr. Paul Nadler, MD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-2138
Dr. Paul Solari, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 566-7929
Dr. Paul Wolters, MD
San Francisco, CA · $12,528 in drug and device payments (2025) · Telehealth · (415) 353-2961
Dr. Pearl Toy, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 476-5734
Dr. Pedro Aceves-casillas, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 750-5995
Dr. Pedro Guevara, MD
San Francisco, CA · No drug or device payments recorded (2025) · (214) 712-2403
Dr. Peggy Bui, MD MBA
San Francisco, CA · No drug or device payments recorded (2025) · (415) 353-7900
Dr. Peggy Leung, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-7900
Dr. Peter Barish, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 502-1967
Dr. Peter Berman, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 626-2951
Dr. Peter Coopersmith, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 921-5300
Dr. Peter Sayre, M.D.
San Francisco, CA · $21 in drug and device payments (2025) · Telehealth · (415) 353-2421
Dr. Peter Yeo, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 353-9070
Dr. Petia Kremen, MD
San Francisco, CA · $19 in drug and device payments (2025) · (888) 663-6331

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.