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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. Ronald Collins, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 657-4060
Dr. Ron Chai, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 803-0124
Dr. Roopa Rajgopal, M.D.,
Downey, CA · No drug or device payments recorded (2025) · (562) 445-6370
Dr. Ruchi Sareen, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 869-1070
Dr. Safieh Golestaneh
Downey, CA · No drug or device payments recorded (2025) · (562) 869-1089
Dr. Sameer Amin, MD
Downey, CA · No drug or device payments recorded (2025) · (562) 862-3684
Dr. Sami Edris, MD
Downey, CA · No drug or device payments recorded (2025) · (562) 869-1070
Dr. Sepideh Chegini, M.D.
Downey, CA · $27 in drug and device payments (2025) · (562) 862-3684
Dr. Shahryar Davari, MD
Downey, CA · No drug or device payments recorded (2025) · (702) 453-3799
Dr. Shangida Ahsan, MD
Downey, CA · No drug or device payments recorded (2025) · (562) 869-1089
Dr. Shaun Singh, DO
Downey, CA · No drug or device payments recorded (2025) · (714) 443-4512
Dr. Shiva Shabnam, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 869-1070
Dr. Sohail Afra, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 657-4958
Dr. Stanley Crittenden, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 862-3684
Dr. Stephanie Chen, MD
Downey, CA · No drug or device payments recorded (2025) · (562) 401-7611
Dr. Stephen Chen, M.D.
Downey, CA · $17 in drug and device payments (2025) · (562) 657-9000
Dr. Susie Kim, M.D.
Downey, CA · $36 in drug and device payments (2025) · (562) 657-9575
Dr. Tiffany Cushing, MD
Downey, CA · No drug or device payments recorded (2025) · Telehealth · (833) 574-2273
Dr. Triyug Malla Thakuri
Downey, CA · $17 in drug and device payments (2025) · (562) 904-5000
Dr. Varneet Sandhu, M.D
Downey, CA · No drug or device payments recorded (2025) · (701) 579-3203
Dr. Veda Ramesh, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 657-9566
Dr. Victor Weng, D.O.
Downey, CA · No drug or device payments recorded (2025) · (562) 869-4497
Dr. Vinod Patel, M.D.
Downey, CA · $21 in drug and device payments (2025) · (562) 862-2775
Dr. Vinod Valluri
Downey, CA · No drug or device payments recorded (2025) · (562) 658-3660
Dr. Wang Ji, M.D.
Downey, CA · $19 in drug and device payments (2025) · (562) 862-3684
Dr. William Sim, MD
Downey, CA · $1,982 in drug and device payments (2025) · Telehealth · (562) 806-0874
Dr. Yaga Szlachcic, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 803-0124
Dr. Ying Ting Lau
Downey, CA · No drug or device payments recorded (2025) · (562) 657-9000
Dr. Elizabeth Smalley, MD
Duarte, CA · No drug or device payments recorded (2025) · (626) 358-8901
Dr. Gilbert Walton, MD
Duarte, CA · No drug or device payments recorded (2025) · (626) 358-0269
Dr. Houman Badrzadeh, DO
Duarte, CA · No drug or device payments recorded (2025) · (800) 826-4673
Dr. Indravadan Shah, MD
Duarte, CA · No drug or device payments recorded (2025) · (626) 358-2576
Dr. Karam Ashouri, MD
Duarte, CA · $131 in drug and device payments (2025) · (800) 826-4673
Dr. Koral Shah, MD
Duarte, CA · $345 in drug and device payments (2025) · (800) 826-4673
Dr. Mohammed Siddiqui, MD
Duarte, CA · No drug or device payments recorded (2025) · (626) 256-4673
Dr. Razmik Thomassian, M.D.
Duarte, CA · No drug or device payments recorded (2025) · (877) 254-4496
Dr. Stan Mathioulakis, MD
Duarte, CA · $49 in drug and device payments (2025) · (626) 358-3204
Dr. Tomoko Tagawa, M.D.
Duarte, CA · No drug or device payments recorded (2025) · Telehealth · (626) 471-9200
Dr. Tyler Seto, M.D.
Duarte, CA · No drug or device payments recorded (2025) · (626) 256-4673
Dr. Ulin Sargeant, M.D., MPH
Duarte, CA · No drug or device payments recorded (2025) · Telehealth · (877) 254-4496
Dr. Yu Wang, MD
Duarte, CA · No drug or device payments recorded (2025) · (626) 256-4673
Dr. Andal Kadambi, MD
Dublin, CA · No drug or device payments recorded (2025) · Telehealth · (925) 875-6100
Dr. Brian Bakke
Dublin, CA · No drug or device payments recorded (2025) · Telehealth · (925) 875-6100
Dr. Bryan Chin, DO
Dublin, CA · No drug or device payments recorded (2025) · Telehealth · (925) 875-6100
Dr. Daljeet Samra, M.D.
Dublin, CA · $1,945 in drug and device payments (2025) · Telehealth · (703) 626-2304
Dr. Damayanthi Kalisetti, MD
Dublin, CA · No drug or device payments recorded (2025) · Telehealth · (925) 875-6100
Dr. David Wang
Dublin, CA · No drug or device payments recorded (2025) · Telehealth · (925) 875-6100
Dr. Diana Nguyen, M.D.
Dublin, CA · No drug or device payments recorded (2025) · Telehealth · (925) 875-6100
Dr. Geetanjali Wadhavkar, MD
Dublin, CA · No drug or device payments recorded (2025) · Telehealth · (925) 875-6100
Dr. Jacqueline Keedy, M.D.
Dublin, CA · No drug or device payments recorded (2025) · Telehealth · (925) 875-6100

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

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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.