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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. Susan Sulieman, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 226-7556
Dr. Susie Lau, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 262-0521
Dr. Suzann Khorramzadeh, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 857-2000
Dr. Syed Hossain, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (818) 343-2775
Dr. Takeshi Matsumoto, M.D.
Los Angeles, CA · $19 in drug and device payments (2025) · (213) 620-0822
Dr. Tamara Ma, M.D.
Los Angeles, CA · $26 in drug and device payments (2025) · (323) 268-5000
Dr. Tami Higa, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 857-2000
Dr. Tammy Wan, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 206-4083
Dr. Tanya Haddadin, DO
Los Angeles, CA · No drug or device payments recorded (2025) · (562) 826-8000
Dr. Tasnin Khan, DO
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 206-8000
Dr. Tawny Marie Nocon-patalinjug, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (833) 574-2273
Dr. Taylor Attar, DO
Los Angeles, CA · $125 in drug and device payments (2025) · Telehealth · (310) 996-9355
Dr. Teresa Merced, MD
Los Angeles, CA · $445 in drug and device payments (2025) · (310) 556-0335
Dr. Terri Leigh Abe, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 226-2662
Dr. Terry Jerge, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (213) 977-1138
Dr. Teryl Nuckols, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 825-6301
Dr. Thanavut Jiansakul, M.D.
Los Angeles, CA · $196 in drug and device payments (2025) · (562) 867-7999
Dr. Thanh Neville, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (310) 309-0707
Dr. Than Ma
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 254-5291
Dr. Theingi Oo, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 662-0492
Dr. Theodore Shu, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 442-5100
Dr. Thien-kim Co, DO
Los Angeles, CA · $511 in drug and device payments (2025) · (323) 268-5000
Dr. Thomas Ahn, MD
Los Angeles, CA · $2,565 in drug and device payments (2025) · (310) 277-7600
Dr. Thomas Buchanan, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 442-9576
Dr. Thomas Hascall, MD
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (323) 634-3850
Dr. Thomas Kanegae, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (213) 977-1030
Dr. Thomas Magee, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (213) 207-5030
Dr. Thomas Mattimore, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 319-4377
Dr. Thomas Tom, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 783-4011
Dr. Thomas Yoshikawa, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (562) 427-5363
Dr. Thuan Nguyen
Los Angeles, CA · $82 in drug and device payments (2025) · (213) 977-2121
Dr. Tiffany Chow, MD
Los Angeles, CA · $663 in drug and device payments (2025) · (323) 442-2807
Dr. Timothy Pham, MD
Los Angeles, CA · $50 in drug and device payments (2025) · (323) 857-2000
Dr. Timothy Reynolds, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 478-1188
Dr. Timothy Tran, MD
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (323) 783-4011
Dr. Tina Kantaria, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 206-6232
Dr. Tina Mosaferi, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 478-3711
Dr. Tin Botzler, MD
Los Angeles, CA · $839 in drug and device payments (2025) · Telehealth · (323) 409-7531
Dr. Ting-lin Kao, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (213) 253-2677
Dr. Tish Villanueva, MD
Los Angeles, CA · $17 in drug and device payments (2025) · (800) 954-8000
Dr. Tomas Espinoza, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 226-7556
Dr. Tony Su, M.D.
Los Angeles, CA · $61 in drug and device payments (2025) · (323) 987-1362
Dr. Tsz Ying Lee, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (213) 415-1990
Dr. Tyler Beale, RDN
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 563-4800
Dr. Tyler Duong
Los Angeles, CA · $52 in drug and device payments (2025) · (323) 780-2216
Dr. Tyler Larsen
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 825-7375
Dr. Tyler Morad
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 206-6232
Dr. Tzung Hsiai, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 857-2000
Dr. Umme-aiman Halai, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 825-8373
Dr. Utpal Sandesara, MD, PHD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 825-7375

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.