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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. Ramonchito Menor, M.D.
Porterville, CA · No drug or device payments recorded (2025) · Telehealth · (559) 781-7980
Dr. Ravindranath Reddy, MD
Porterville, CA · $156 in drug and device payments (2025) · (559) 784-4727
Dr. Rosalie Kogan, MD (PHD)
Porterville, CA · No drug or device payments recorded (2025) · (424) 385-6431
Dr. Sartaj Dhillon, MD
Porterville, CA · $388 in drug and device payments (2025) · (559) 784-5717
Dr. Shashi Gupta, MD
Porterville, CA · No drug or device payments recorded (2025) · (559) 788-6156
Dr. Subash Bishwakarma, MBBS
Porterville, CA · No drug or device payments recorded (2025) · (559) 789-4937
Dr. Thieu Nguyen, M.D.
Porterville, CA · No drug or device payments recorded (2025) · (559) 784-1110
Dr. Victoria Lopez, MD
Porterville, CA · $36 in drug and device payments (2025) · (559) 784-1110
Dr. Vinay Buttan, MD
Porterville, CA · $620 in drug and device payments (2025) · Telehealth · (559) 782-1990
Dr. Vinit Agrawal, MD
Porterville, CA · No drug or device payments recorded (2025) · (559) 791-3880
Dr. Lino Dial, M.D.
Portola, CA · No drug or device payments recorded (2025) · (530) 832-6500
Dr. Lovsho Phen
Portola, CA · No drug or device payments recorded (2025) · (530) 993-4184
Dr. Emma Morton-bours, M.D.
Portola Valley, CA · No drug or device payments recorded (2025) · (650) 851-6000
Dr. Gerard Sarnat, M.D.
Portola Valley, CA · No drug or device payments recorded (2025) · (650) 224-2027
Dr. Kathryn Hallsten, M.D.
Portola Valley, CA · No drug or device payments recorded (2025) · (650) 385-1970
Dr. Ning Tang, M.D.
Portola Valley, CA · No drug or device payments recorded (2025) · (650) 498-9000
Dr. Rebecca Long
Portola Valley, CA · No drug or device payments recorded (2025) · (650) 255-7699
Dr. Sylvia Friedberg, M.D.
Portola Valley, CA · No drug or device payments recorded (2025) · (650) 854-5183
Dr. Aeria Chang, M.D.
Poway, CA · $26 in drug and device payments (2025) · (858) 883-2855
Dr. Akber Safi, MD
Poway, CA · $1,024 in drug and device payments (2025) · Telehealth · (858) 485-6444
Dr. Alan Schoengold, M.D.
Poway, CA · No drug or device payments recorded (2025) · (858) 485-6644
Dr. Amanda Caparso, D.O.
Poway, CA · $770 in drug and device payments (2025) · Telehealth · (586) 753-2938
Dr. Belinda Dure-smith, MD
Poway, CA · $496 in drug and device payments (2025) · Telehealth · (858) 675-3100
Dr. Bill Joswig, MD
Poway, CA · No drug or device payments recorded (2025) · (858) 675-3100
Dr. Charlotte Brandt
Poway, CA · $111 in drug and device payments (2025) · (858) 486-9100
Dr. Cory Nelkin, D.O.
Poway, CA · No drug or device payments recorded (2025) · (858) 613-4000
Dr. Cynthia Robertson, MD
Poway, CA · No drug or device payments recorded (2025) · (858) 485-7648
Dr. David Carty, MD
Poway, CA · $700 in drug and device payments (2025) · Telehealth · (858) 675-3100
Dr. Demah Alobaidi, MD
Poway, CA · $43 in drug and device payments (2025) · Telehealth · (833) 867-4642
Dr. Dennis Mamaril, MD
Poway, CA · $314 in drug and device payments (2025) · Telehealth · (858) 675-3100
Dr. Elizabeth Salada, M.D.
Poway, CA · $732 in drug and device payments (2025) · Telehealth · (858) 312-5492
Dr. Hassan Alsabbak, M.D.
Poway, CA · $21 in drug and device payments (2025) · (858) 648-0213
Dr. Jerome Brodkin, MD
Poway, CA · No drug or device payments recorded (2025) · (858) 675-3100
Dr. Kathy Clewell, M.D.
Poway, CA · $5,858 in drug and device payments (2025) · (858) 592-7040
Dr. Kevin Merkes, MD
Poway, CA · $1,161 in drug and device payments (2025) · Telehealth · (858) 485-6444
Dr. Larry Konzen
Poway, CA · No drug or device payments recorded (2025) · (858) 485-6644
Dr. Larry Presant, MD
Poway, CA · $564 in drug and device payments (2025) · Telehealth · (858) 675-3100
Dr. Monica Ormsby, MD
Poway, CA · No drug or device payments recorded (2025) · (858) 618-1734
Dr. Richard Merino, MD
Poway, CA · No drug or device payments recorded (2025) · (858) 485-6644
Dr. Rong Zou, M.D.
Poway, CA · No drug or device payments recorded (2025) · (858) 618-1596
Dr. Stuart Klein, MD
Poway, CA · $983 in drug and device payments (2025) · Telehealth · (858) 485-6444
Dr. Suzanne Johnston, D.O
Poway, CA · No drug or device payments recorded (2025) · (858) 312-5492
Dr. Aaron Lehman, M.D.
Ramona, CA · No drug or device payments recorded (2025) · (760) 789-1223
Dr. Deepti Mundkur, MBBS
Ramona, CA · No drug or device payments recorded (2025) · (760) 789-5160
Dr. Doris Yung, MD
Ramona, CA · $738 in drug and device payments (2025) · (760) 789-1223
Dr. Lysa Ho, DO
Ramona, CA · $488 in drug and device payments (2025) · (760) 736-6767
Dr. Robert Zgliniec, MD
Ramona, CA · No drug or device payments recorded (2025) · (760) 789-5160
Dr. Abigail Kopecky, M.D.
Rancho Cordova, CA · No drug or device payments recorded (2025) · (916) 843-7000
Dr. Divya Makin, MD
Rancho Cordova, CA · No drug or device payments recorded (2025) · Telehealth · (916) 631-3000
Dr. Francis Felix, M.D.
Rancho Cordova, CA · No drug or device payments recorded (2025) · (916) 464-4457

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.