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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. Astred Castro
Sacramento, CA · No drug or device payments recorded (2025) · (916) 734-2737
Dr. Athira Narayan, MD
Sacramento, CA · $41 in drug and device payments (2025) · (916) 734-2737
Dr. Ator Auwinger, M.D.
Sacramento, CA · No drug or device payments recorded (2025) · (916) 733-7777
Dr. Augusta Okolo, MD, MS
Sacramento, CA · No drug or device payments recorded (2025) · (916) 734-7080
Dr. Aysha Mahmood, MD
Sacramento, CA · No drug or device payments recorded (2025) · (916) 973-5000
Dr. Baljeet Soor, MD
Sacramento, CA · $34 in drug and device payments (2025) · (916) 973-5000
Dr. Baljit Gill, M.D.
Sacramento, CA · $2,531 in drug and device payments (2025) · (530) 682-1378
Dr. Barbara Galligan, MD
Sacramento, CA · $16 in drug and device payments (2025) · Telehealth · (916) 734-8617
Dr. Barkha Tiwana, MD
Sacramento, CA · No drug or device payments recorded (2025) · (510) 437-5039
Dr. Bary Siegel, MD
Sacramento, CA · No drug or device payments recorded (2025) · (916) 733-8725
Dr. Bayard Chang, M.D.
Sacramento, CA · $320 in drug and device payments (2025) · Telehealth · (916) 929-2526
Dr. Behnaz Farhang
Sacramento, CA · $32 in drug and device payments (2025) · Telehealth · (916) 733-5098
Dr. Bela Desai, MD
Sacramento, CA · No drug or device payments recorded (2025) · (916) 973-5000
Dr. Belal Sultanzai
Sacramento, CA · No drug or device payments recorded (2025) · (916) 734-7506
Dr. Betty Murray, DO
Sacramento, CA · No drug or device payments recorded (2025) · Telehealth · (916) 733-3400
Dr. Bhupinder Lehil, M.D.
Sacramento, CA · No drug or device payments recorded (2025) · (916) 914-6358
Dr. Bilawal Mahmood, MD
Sacramento, CA · No drug or device payments recorded (2025) · (916) 734-2737
Dr. Bill Burr, MD
Sacramento, CA · No drug or device payments recorded (2025) · (916) 973-5000
Dr. Bonnie Gieschen, MD
Sacramento, CA · No drug or device payments recorded (2025) · (916) 688-2000
Dr. Boone Seto, MD
Sacramento, CA · No drug or device payments recorded (2025) · (916) 688-2000
Dr. Boyu Wang, D.O.
Sacramento, CA · No drug or device payments recorded (2025) · (916) 733-3777
Dr. Brandon Chock, M.D.
Sacramento, CA · $16 in drug and device payments (2025) · Telehealth · (916) 734-7080
Dr. Brenda Ruvalcaba, M.D.
Sacramento, CA · No drug or device payments recorded (2025) · (916) 734-7587
Dr. Brian Lim, M.D.
Sacramento, CA · $1,034 in drug and device payments (2025) · Telehealth · (916) 734-3751
Dr. Brian Pham, MD
Sacramento, CA · $143 in drug and device payments (2025) · Telehealth · (916) 734-3772
Dr. Brigitte Berry, M.D.
Sacramento, CA · No drug or device payments recorded (2025) · Telehealth · (916) 734-7777
Dr. Britany Lundberg
Sacramento, CA · No drug or device payments recorded (2025) · (916) 734-2723
Dr. Brittany Bartolome, M.D.
Sacramento, CA · No drug or device payments recorded (2025) · (916) 703-7187
Dr. Brittany Chatterton
Sacramento, CA · No drug or device payments recorded (2025) · Telehealth · (707) 356-5915
Dr. Bruce Ermann, MD
Sacramento, CA · No drug or device payments recorded (2025) · (916) 679-3693
Dr. Bryan Lee, M.D.
Sacramento, CA · $25 in drug and device payments (2025) · (916) 428-0656
Dr. Burch Bryant, MD
Sacramento, CA · No drug or device payments recorded (2025) · (916) 688-2000
Dr. Calvin Hirsch, MD
Sacramento, CA · No drug or device payments recorded (2025) · (916) 734-7005
Dr. Carl Bourne, M.D.
Sacramento, CA · No drug or device payments recorded (2025) · (916) 874-9670
Dr. Carolina Candotti, MD
Sacramento, CA · No drug or device payments recorded (2025) · (916) 734-7506
Dr. Caroline Snead
Sacramento, CA · No drug or device payments recorded (2025) · (916) 734-2011
Dr. Catherine Chia, M.D.
Sacramento, CA · No drug or device payments recorded (2025) · (916) 734-7056
Dr. Catherine Ituarte, MD
Sacramento, CA · No drug or device payments recorded (2025) · (800) 282-3284
Dr. Cathy Castagna, D.O.
Sacramento, CA · No drug or device payments recorded (2025) · (916) 973-5000
Dr. Cecilia Huang, MD
Sacramento, CA · No drug or device payments recorded (2025) · (916) 734-2011
Dr. Charanjit Sandhu, M.D.
Sacramento, CA · $288 in drug and device payments (2025) · (916) 569-4400
Dr. Charlene Hansen, M.D.
Sacramento, CA · No drug or device payments recorded (2025) · (916) 443-3299
Dr. Charles Harrod, M.D.
Sacramento, CA · No drug or device payments recorded (2025) · (916) 737-5555
Dr. Charles Poon, M.D.
Sacramento, CA · $150 in drug and device payments (2025) · (916) 734-3575
Dr. Charlotte Newcomb, MD
Sacramento, CA · No drug or device payments recorded (2025) · Telehealth · (916) 688-2000
Dr. Chhaya Hasyagar, M. D.
Sacramento, CA · No drug or device payments recorded (2025) · (916) 734-3751
Dr. Chih-huan Lu
Sacramento, CA · $484 in drug and device payments (2025) · (916) 734-8230
Dr. Chloe Lalonde
Sacramento, CA · $136 in drug and device payments (2025) · (916) 734-3772
Dr. Chrishanthie Karalakulasingam, MD
Sacramento, CA · No drug or device payments recorded (2025) · Telehealth · (916) 286-8700
Dr. Christabel Mangwe Sabtala, M.D.
Sacramento, CA · No drug or device payments recorded (2025) · (916) 734-7506

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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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.