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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. David Yang, M.D.
Gold River, CA · $24 in drug and device payments (2025) · (916) 266-9057
Dr. Dinesh Pokharel, M.D.
Gold River, CA · No drug or device payments recorded (2025) · Telehealth · (916) 281-2251
Dr. Brian Lonquich, M.D.
Goleta, CA · $16 in drug and device payments (2025) · (805) 681-0013
Dr. Jared Perrin, MD
Goleta, CA · No drug or device payments recorded (2025) · (805) 617-7878
Dr. Karina Garcia, M.D.
Goleta, CA · $136 in drug and device payments (2025) · (805) 403-8512
Dr. Laura Castillon, MD
Goleta, CA · $35 in drug and device payments (2025) · (775) 830-8557
Dr. Lorraine Birskovich, M.D..
Goleta, CA · No drug or device payments recorded (2025) · (805) 681-7411
Dr. Reyna Talanian, MD
Goleta, CA · No drug or device payments recorded (2025) · Telehealth · (805) 681-0013
Dr. Shirin Moftakhar, MD
Goleta, CA · No drug or device payments recorded (2025) · Telehealth · (805) 681-0013
Dr. Susan Mcclair, M.D.
Goleta, CA · No drug or device payments recorded (2025) · (805) 685-9525
Dr. Zahed Ahmed, MD
Gonzales, CA · $43 in drug and device payments (2025) · (831) 675-9401
Dr. Brian Ayuste, M.D.
Granada Hills, CA · $1,480 in drug and device payments (2025) · Telehealth · (818) 366-4626
Dr. Elaheh Farhadian, M.D.
Granada Hills, CA · $386 in drug and device payments (2025) · Telehealth · (818) 923-5702
Dr. Neeraj Patel, M.D.
Granada Hills, CA · $185 in drug and device payments (2025) · (818) 831-8999
Dr. Paolo Rivera, M.D.
Granada Hills, CA · No drug or device payments recorded (2025) · (480) 393-6378
Dr. Richard Park, M.D.
Granada Hills, CA · $481 in drug and device payments (2025) · Telehealth · (186) 789-8758
Dr. Andrew Ing, MD
Grass Valley, CA · No drug or device payments recorded (2025) · (530) 263-3770
Dr. Charles Shang, MD
Grass Valley, CA · $244 in drug and device payments (2025) · Telehealth · (530) 272-8452
Dr. Christine Newsom, MD
Grass Valley, CA · No drug or device payments recorded (2025) · (530) 477-4480
Dr. Eric Holtrop, M.D.
Grass Valley, CA · No drug or device payments recorded (2025) · (530) 477-4480
Dr. Fouzia Godil, M.D.
Grass Valley, CA · No drug or device payments recorded (2025) · (530) 273-3377
Dr. Ganesh Kulkarni, M.D;
Grass Valley, CA · No drug or device payments recorded (2025) · (508) 654-5160
Dr. Jacob Kopp, M.D.
Grass Valley, CA · No drug or device payments recorded (2025) · (530) 274-6761
Dr. Jane Ragan
Grass Valley, CA · No drug or device payments recorded (2025) · (530) 272-9770
Dr. Jonathan Pierce, MD
Grass Valley, CA · No drug or device payments recorded (2025) · (530) 273-9992
Dr. Kisha Hughes, MD
Grass Valley, CA · No drug or device payments recorded (2025) · (530) 477-4480
Dr. Mehwish Khan, MD
Grass Valley, CA · No drug or device payments recorded (2025) · Telehealth · (530) 274-6600
Dr. Michael Andya, M.D.
Grass Valley, CA · $14 in drug and device payments (2025) · Telehealth · (530) 273-2221
Dr. Michelle-linh Nguyen, MD
Grass Valley, CA · No drug or device payments recorded (2025) · (530) 552-1039
Dr. Nancy Bleile, MD
Grass Valley, CA · $40 in drug and device payments (2025) · (530) 274-5020
Dr. Nicholas Browning, M.D.
Grass Valley, CA · No drug or device payments recorded (2025) · (530) 228-1690
Dr. Peter Yaholkovsky, MD
Grass Valley, CA · No drug or device payments recorded (2025) · (530) 305-2660
Dr. Rajpreet Grewal, MD
Grass Valley, CA · No drug or device payments recorded (2025) · (530) 274-6761
Dr. Sherilynn Cooke, MD
Grass Valley, CA · No drug or device payments recorded (2025) · (530) 265-1450
Dr. Simon Chan, M.D.
Grass Valley, CA · $418 in drug and device payments (2025) · (530) 477-9100
Dr. Stuart Campbell, M.D.
Grass Valley, CA · No drug or device payments recorded (2025) · (530) 274-6085
Dr. Thomas Kanomata, MD
Grass Valley, CA · No drug or device payments recorded (2025) · Telehealth · (530) 477-4480
Dr. Walter Miller, MD
Grass Valley, CA · No drug or device payments recorded (2025) · (530) 268-8778
Dr. Marion Guyer, MD
Greebrae, CA · No drug or device payments recorded (2025) · (415) 461-5552
Dr. Aida Calvillo, MD
Greenbrae, CA · No drug or device payments recorded (2025) · Telehealth · (415) 448-1500
Dr. Alex Farhat
Greenbrae, CA · No drug or device payments recorded (2025) · (415) 925-7000
Dr. Anita Corradetti, M.D.
Greenbrae, CA · No drug or device payments recorded (2025) · (415) 925-7545
Dr. Anjuli Basu, M.D.
Greenbrae, CA · $691 in drug and device payments (2025) · (415) 924-1214
Dr. Anne Cummings, M.D.
Greenbrae, CA · $147 in drug and device payments (2025) · Telehealth · (415) 461-5552
Dr. Catharine Clark-sayles, M.D.
Greenbrae, CA · No drug or device payments recorded (2025) · (415) 464-8176
Dr. Christopher Choo, MD
Greenbrae, CA · No drug or device payments recorded (2025) · (415) 925-7545
Dr. David Berman, M.D.
Greenbrae, CA · No drug or device payments recorded (2025) · (415) 464-8169
Dr. David Ernst, M.D.
Greenbrae, CA · No drug or device payments recorded (2025) · (415) 448-1500
Dr. Fariba Amiri, M.D.
Greenbrae, CA · No drug or device payments recorded (2025) · Telehealth · (415) 925-7086
Dr. Georgianna Farren, MD
Greenbrae, CA · No drug or device payments recorded (2025) · (415) 448-1500

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.