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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. Yi-jen Fong, MD
Campbell, CA · No drug or device payments recorded (2025) · (408) 871-6500
Dr. David Richards, M.D.
Camp Pendleton, CA · No drug or device payments recorded (2025) · Telehealth · (760) 719-4061
Dr. Joanne So, M.D., MPH
Camp Pendleton, CA · No drug or device payments recorded (2025) · (760) 725-1288
Dr. Lidia Kruse Peralta, MD
Camp Pendleton, CA · No drug or device payments recorded (2025) · (760) 725-1213
Dr. Afzal Sahibzada, M.D.
Canoga Park, CA · No drug or device payments recorded (2025) · (818) 719-9117
Dr. Haixin Xu, M.D.
Canoga Park, CA · $194 in drug and device payments (2025) · (818) 888-3123
Dr. Jay Lin, M.D.
Canoga Park, CA · $2,109 in drug and device payments (2025) · (818) 883-6840
Dr. Jeremy Grosser, M.D.
Canoga Park, CA · $25 in drug and device payments (2025) · (818) 885-8500
Dr. Michael Akhondi, MD
Canoga Park, CA · No drug or device payments recorded (2025) · (818) 348-5678
Dr. Nabil Feghali, MD
Canoga Park, CA · $845 in drug and device payments (2025) · (818) 704-7200
Dr. Rami Shaarawy, M.D.
Canoga Park, CA · $130 in drug and device payments (2025) · (818) 716-0557
Dr. Winifred Williams, M.D.
Canoga Park, CA · No drug or device payments recorded (2025) · Telehealth · (323) 434-0434
Dr. Alejandra Green, M.D.
Canyon Country, CA · No drug or device payments recorded (2025) · Telehealth · (661) 367-3500
Dr. Byong-wha Lee, MD
Canyon Country, CA · No drug or device payments recorded (2025) · (661) 250-5244
Dr. Erik Davydov, M.D.
Canyon Country, CA · $138 in drug and device payments (2025) · Telehealth · (661) 250-5230
Dr. Ghazaleh Erfanzadeh, MD.
Canyon Country, CA · No drug or device payments recorded (2025) · (661) 250-5235
Dr. Jin Hur, D.O.
Canyon Country, CA · No drug or device payments recorded (2025) · Telehealth · (661) 250-5200
Dr. Maria Zambrano, M.D.
Canyon Country, CA · No drug or device payments recorded (2025) · (661) 250-5232
Dr. Navid Massoudi, MD
Canyon Country, CA · No drug or device payments recorded (2025) · (661) 250-5230
Dr. Pravin Date, M.D.
Canyon Country, CA · $50 in drug and device payments (2025) · (661) 803-4824
Dr. Shamsundar Ramrattan, D.O.
Canyon Country, CA · No drug or device payments recorded (2025) · (661) 252-7580
Dr. Tarannum Alam, MD.
Canyon Country, CA · No drug or device payments recorded (2025) · Telehealth · (661) 250-5235
Dr. Unber Ali, M.D.
Canyon Country, CA · No drug or device payments recorded (2025) · (661) 250-5200
Dr. Vernon Lackman, M.D.
Canyon Country, CA · No drug or device payments recorded (2025) · (661) 250-5244
Dr. Alex Denes, MD
Canyon Lake, CA · No drug or device payments recorded (2025) · (951) 925-6969
Dr. Thomas Schenk, M.D.
Capistrano Beach, CA · No drug or device payments recorded (2025) · (949) 481-6855
Dr. Karuna Sharma, MD
Capitola, CA · No drug or device payments recorded (2025) · (831) 684-7611
Dr. Yun-ching Chen, M.D.
Capitola, CA · No drug or device payments recorded (2025) · (831) 462-6013
Dr. Andrew Hall, M.D.
Carlsbad, CA · No drug or device payments recorded (2025) · (760) 729-8600
Dr. Christine Kelso, MD, MPH
Carlsbad, CA · No drug or device payments recorded (2025) · (800) 290-5000
Dr. Deepak Chopra, M.D.
Carlsbad, CA · No drug or device payments recorded (2025) · (760) 494-1625
Dr. Jonathan Rivkin, MD
Carlsbad, CA · $16 in drug and device payments (2025) · (760) 927-5434
Dr. Lalitha Padmanabhan Aiyer, MD
Carlsbad, CA · No drug or device payments recorded (2025) · (908) 285-0444
Dr. Maribeth Chong, M.D
Carlsbad, CA · $1,347 in drug and device payments (2025) · (760) 434-6060
Dr. Mark Marino
Carlsbad, CA · $11,250 in drug and device payments (2025) · (914) 513-6459
Dr. Michael Pham, DO
Carlsbad, CA · $1,031 in drug and device payments (2025) · Telehealth · (760) 827-7210
Dr. Paolo Zizzo, D.O.
Carlsbad, CA · No drug or device payments recorded (2025) · (760) 448-4412
Dr. Reyzan Shali, MD
Carlsbad, CA · $846 in drug and device payments (2025) · Telehealth · (760) 940-7000
Dr. Stacie Ly, MD
Carlsbad, CA · $1,494 in drug and device payments (2025) · Telehealth · (760) 827-7200
Dr. Valerie Novak, M.D.
Carlsbad, CA · No drug or device payments recorded (2025) · (760) 929-9631
Dr. Yoo Jin Chong, M.D
Carlsbad, CA · $1,896 in drug and device payments (2025) · (760) 434-6060
Dr. Andrew Johnston, MD
Carmel, CA · No drug or device payments recorded (2025) · (831) 718-9701
Dr. Carl Bergstrom, MD
Carmel, CA · No drug or device payments recorded (2025) · (831) 624-3077
Dr. David Straface, MD
Carmel, CA · No drug or device payments recorded (2025) · Telehealth · (831) 718-9701
Dr. Denise Mark, M.D.
Carmel, CA · No drug or device payments recorded (2025) · (831) 625-9999
Dr. Gediminas Ruibys, M.D.
Carmel, CA · $125 in drug and device payments (2025) · Telehealth · (831) 582-2100
Dr. Jessitasinghna Albert Messiah Dhas, MD
Carmel, CA · No drug or device payments recorded (2025) · Telehealth · (831) 718-9701
Dr. Jill Tiongco, MD
Carmel, CA · $252 in drug and device payments (2025) · Telehealth · (831) 718-9701
Dr. Keiko Saito, M.D.
Carmel, CA · No drug or device payments recorded (2025) · (831) 718-9701
Dr. Kinza Sultan
Carmel, CA · $14 in drug and device payments (2025) · Telehealth · (831) 718-9701

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.