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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. Peter Csapoczi, MD
San Bernardino, CA · $141 in drug and device payments (2025) · (909) 883-8611
Dr. Richard Moyer, M.D.
San Bernardino, CA · No drug or device payments recorded (2025) · (909) 886-5158
Dr. Roberto Contreras, M.D.
San Bernardino, CA · $26 in drug and device payments (2025) · (909) 890-0407
Dr. Robert Yang, M.D.
San Bernardino, CA · No drug or device payments recorded (2025) · (909) 433-0678
Dr. Romeo Rodriguez, M.D.
San Bernardino, CA · No drug or device payments recorded (2025) · (909) 884-9091
Dr. Ronald Burton, MD
San Bernardino, CA · No drug or device payments recorded (2025) · (909) 883-8611
Dr. Samuel Bolivar, MD
San Bernardino, CA · $498 in drug and device payments (2025) · (909) 888-8154
Dr. Sandy Gad
San Bernardino, CA · No drug or device payments recorded (2025) · (909) 883-8711
Dr. Sapna Patel, D.O.
San Bernardino, CA · $16 in drug and device payments (2025) · (909) 881-4520
Dr. Shameela Begum, M.D.
San Bernardino, CA · No drug or device payments recorded (2025) · (000) 000-0000
Dr. Shuang Bai, M.D.
San Bernardino, CA · $1,120 in drug and device payments (2025) · (909) 883-3838
Dr. Shyam Patel, M.D.
San Bernardino, CA · No drug or device payments recorded (2025) · (909) 881-4520
Dr. Susan Aminzai, M.D.
San Bernardino, CA · $16 in drug and device payments (2025) · Telehealth · (909) 883-8611
Dr. Talal Samaan, MD
San Bernardino, CA · No drug or device payments recorded (2025) · (909) 881-4520
Dr. Theresa Win
San Bernardino, CA · No drug or device payments recorded (2025) · (909) 887-6333
Dr. Tony Kastoon, M.D.
San Bernardino, CA · $11,508 in drug and device payments (2025) · (909) 882-1210
Dr. Tu Hoang, M.D.
San Bernardino, CA · No drug or device payments recorded (2025) · (909) 388-9222
Dr. Udoh Obioha, MD
San Bernardino, CA · $29 in drug and device payments (2025) · (909) 521-7509
Dr. Vinh Mai, D.O.
San Bernardino, CA · $24 in drug and device payments (2025) · (909) 881-4520
Dr. Vinod Kaura, MD
San Bernardino, CA · No drug or device payments recorded (2025) · (909) 887-6715
Dr. Wilfredo Tupas, MD
San Bernardino, CA · No drug or device payments recorded (2025) · (909) 883-8611
Dr. Wilson Gomer, MD
San Bernardino, CA · $14 in drug and device payments (2025) · (909) 887-7427
Dr. Yolanda Mickevicius Ruokis, MD
San Bernardino, CA · No drug or device payments recorded (2025) · (909) 537-3295
Dr. Zar Min, M.D.
San Bernardino, CA · No drug or device payments recorded (2025) · (909) 883-8611
Dr. Henry Roque, MD
San Bruno, CA · No drug or device payments recorded (2025) · (650) 227-1150
Dr. Jacqueline Miodownik-aisenberg, MD
San Bruno, CA · No drug or device payments recorded (2025) · Telehealth · (650) 742-2100
Dr. Jade Ramos-poblete, M.D.
San Bruno, CA · No drug or device payments recorded (2025) · (650) 742-2100
Dr. Leila Mohammadi
San Bruno, CA · No drug or device payments recorded (2025) · (628) 800-1675
Dr. Virginia Dzul-church
San Bruno, CA · No drug or device payments recorded (2025) · (650) 615-6000
Dr. Alireza Shafaie, MD
San Carlos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 596-4000
Dr. Amy Portmore, MD
San Carlos, CA · No drug or device payments recorded (2025) · (650) 596-4000
Dr. Brett Wolff, MD
San Carlos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 596-4000
Dr. Charlotte Gonzales, M.D.
San Carlos, CA · $147 in drug and device payments (2025) · (650) 591-2675
Dr. Christie Moua, MD
San Carlos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 596-4000
Dr. David Jacoby, MD
San Carlos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 631-7000
Dr. Ginger Roehrig, MD
San Carlos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 321-4121
Dr. Jefferson Wen
San Carlos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 596-4000
Dr. Kenneth Lin, MD
San Carlos, CA · $119 in drug and device payments (2025) · Telehealth · (650) 596-4000
Dr. Martha Mejia, M.D.
San Carlos, CA · No drug or device payments recorded (2025) · (650) 596-9085
Dr. Na Li, MD
San Carlos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 596-4000
Dr. Patricia Santana, MD
San Carlos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 596-4000
Dr. Rebecca Ashe, MD
San Carlos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 596-4000
Dr. Ritu Bansal
San Carlos, CA · No drug or device payments recorded (2025) · Telehealth · (201) 574-3699
Dr. Robert Russo, MD
San Carlos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 596-4000
Dr. Shanti Perkins, M.D.
San Carlos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 596-4000
Dr. Suzanne Dey, MD
San Carlos, CA · No drug or device payments recorded (2025) · (650) 595-3616
Dr. Tony Cun
San Carlos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 596-4000
Dr. Cary Stewart, M.D.
San Clemente, CA · No drug or device payments recorded (2025) · (949) 542-6154
Dr. Faramarz Payandeh, MD
San Clemente, CA · No drug or device payments recorded (2025) · (714) 665-1600
Dr. Greg Brown, M.D.
San Clemente, CA · $599 in drug and device payments (2025) · Telehealth · (949) 661-9657

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.