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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. Bakul Roy, M.D.
San Ramon, CA · $532 in drug and device payments (2025) · Telehealth · (925) 866-8080
Dr. Edsil De Ocampo, MD
San Ramon, CA · No drug or device payments recorded (2025) · (925) 275-9200
Dr. Frank Hsueh, M.D.
San Ramon, CA · No drug or device payments recorded (2025) · (925) 786-5322
Dr. Franklin Lemon, M.D.
San Ramon, CA · No drug or device payments recorded (2025) · (925) 277-3070
Dr. James Allen, D.O.
San Ramon, CA · No drug or device payments recorded (2025) · (925) 842-3224
Dr. Janice Lee, MD
San Ramon, CA · No drug or device payments recorded (2025) · (925) 838-6533
Dr. Joseph Mardanzai, MD
San Ramon, CA · $92 in drug and device payments (2025) · (925) 736-1000
Dr. Kushal Chhabra, MD
San Ramon, CA · $32 in drug and device payments (2025) · Telehealth · (925) 838-6511
Dr. Laurie Draughon, M.D.
San Ramon, CA · No drug or device payments recorded (2025) · (925) 324-8227
Dr. Michael Temkin, D.O.
San Ramon, CA · No drug or device payments recorded (2025) · (925) 866-3900
Dr. Paul Wheeler, MD
San Ramon, CA · $20 in drug and device payments (2025) · Telehealth · (925) 838-6511
Dr. Shirin Zavoshi, MD
San Ramon, CA · $22 in drug and device payments (2025) · (925) 275-9200
Dr. Sue Knight, MD
San Ramon, CA · No drug or device payments recorded (2025) · (925) 838-6511
Dr. Sujatha Rajagopalan, M.D.
San Ramon, CA · No drug or device payments recorded (2025) · (925) 361-5531
Dr. Tehmina Kanwal, MD
San Ramon, CA · No drug or device payments recorded (2025) · Telehealth · (925) 361-5959
Dr. Tiffany Kuo
San Ramon, CA · No drug or device payments recorded (2025) · (925) 275-9200
Dr. Victorina Hoffmann, M.D.
San Ramon, CA · $610 in drug and device payments (2025) · Telehealth · (925) 866-8800
Dr. Vipulkumar Rana, M.D.
San Ramon, CA · No drug or device payments recorded (2025) · (707) 651-2440
Dr. Waheed Ibrahimi, MD
San Ramon, CA · $3,159 in drug and device payments (2025) · (925) 365-7337
Dr. Yshay Shlesinger, M.D.
San Ramon, CA · $41,796 in drug and device payments (2025) · Telehealth · (925) 552-5284
Dr. Ajay Meka, M.D.
Santa Ana, CA · $121 in drug and device payments (2025) · Telehealth · (714) 979-5734
Dr. Alan Ross, MD
Santa Ana, CA · $51 in drug and device payments (2025) · (714) 755-0224
Dr. Alan Schwartz, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 918-3070
Dr. Alex Hashemi, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 502-3553
Dr. Ali Shahverdiani, M.D.
Santa Ana, CA · $434 in drug and device payments (2025) · Telehealth · (714) 352-5800
Dr. Archana Shah, MD
Santa Ana, CA · $19 in drug and device payments (2025) · (714) 835-8501
Dr. Athena Alexander, M.D.
Santa Ana, CA · $20 in drug and device payments (2025) · (714) 352-2911
Dr. Boris Trifunovic, M.D. PHD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 427-7800
Dr. Bruce Tagle, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 633-5038
Dr. Chia Ying Wang, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Christopher Ried, M.D.
Santa Ana, CA · $21 in drug and device payments (2025) · (714) 834-8598
Dr. Christopher Zimmerman, MD, MPH
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 834-5037
Dr. Dara Saghafi, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 835-9147
Dr. David Maclachlan, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 544-7175
Dr. Diane Kim, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 288-3230
Dr. Frank Badin, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 972-8818
Dr. Ghalib Wahidi, M.D.
Santa Ana, CA · $209 in drug and device payments (2025) · Telehealth · (949) 422-0615
Dr. Hai Nguyen, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 675-3937
Dr. Hamendra Rana, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 547-6278
Dr. Hammam Kemeh, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 352-2911
Dr. Hassan Aliakbarian, MD
Santa Ana, CA · $194 in drug and device payments (2025) · (714) 352-5800
Dr. Hidenori Ikuhara, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 954-0432
Dr. Hima Natla, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · Telehealth · (714) 929-2300
Dr. Hung-min Sung, M.D.
Santa Ana, CA · $250 in drug and device payments (2025) · (714) 754-0310
Dr. Huu Nguyen, M.D.
Santa Ana, CA · $496 in drug and device payments (2025) · (714) 957-0040
Dr. Iyad Houshan, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 619-8777
Dr. Jamshid Tamiry, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (949) 721-8482
Dr. Jane Curtis, M.D.
Santa Ana, CA · $407 in drug and device payments (2025) · Telehealth · (714) 541-3001
Dr. John Feng, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (888) 789-9585
Dr. Julie Low, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 834-8243

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.