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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. Mark Granoff, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 855-8081
Dr. Mark Grossman, MD
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (310) 208-7777
Dr. Mark Hyman, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 234-0400
Dr. Mark Kang, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 226-6571
Dr. Mark Katz, MD
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (323) 857-2000
Dr. Mark Lieber, MD
Los Angeles, CA · $177 in drug and device payments (2025) · (323) 409-8255
Dr. Mark Noah, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 423-4683
Dr. Mark Schuster, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 206-6923
Dr. Marshall Sachs, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 206-6923
Dr. Martha Galvan, MD
Los Angeles, CA · $1,149 in drug and device payments (2025) · Telehealth · (310) 312-5050
Dr. Martha Meza, MD
Los Angeles, CA · $16 in drug and device payments (2025) · Telehealth · (323) 340-1500
Dr. Martin Hauptschein, M.D.
Los Angeles, CA · $1,098 in drug and device payments (2025) · Telehealth · (310) 553-6777
Dr. Martin Hirsch, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 783-4011
Dr. Martin Pops, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 794-9718
Dr. Martin Shapiro, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 825-6301
Dr. Marvin Wolf, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 820-4138
Dr. Mary Hardy, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 794-6644
Dr. Mary Saliba, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 470-6108
Dr. Mary Sehl, M.D.
Los Angeles, CA · $120 in drug and device payments (2025) · Telehealth · (310) 709-8355
Dr. Mary White, MD
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (310) 478-3711
Dr. Matthew Barke, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 865-3000
Dr. Matthew Cappiello, MD
Los Angeles, CA · $327 in drug and device payments (2025) · Telehealth · (323) 226-7556
Dr. Matthew Conolly, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 825-9583
Dr. Matthew Duda
Los Angeles, CA · No drug or device payments recorded (2025) · (844) 644-4325
Dr. Matthew Herrmann, MD
Los Angeles, CA · $136,438 in drug and device payments (2025) · Telehealth · (847) 651-4586
Dr. Matthew Juarez, M.D.
Los Angeles, CA · $474 in drug and device payments (2025) · (323) 409-7556
Dr. Matthew Jung, MD
Los Angeles, CA · $299 in drug and device payments (2025) · Telehealth · (310) 272-7640
Dr. Matthew Lederman, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 876-3600
Dr. Matthew Lefferman, DO
Los Angeles, CA · $50 in drug and device payments (2025) · Telehealth · (310) 356-8146
Dr. Matthew Sweeney, MD
Los Angeles, CA · $17 in drug and device payments (2025) · (310) 825-9111
Dr. Matthew Welzenbach, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (213) 749-0947
Dr. Maureen Spell, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 783-4011
Dr. Max Jordan Nguemeni Tiako
Los Angeles, CA · $146 in drug and device payments (2025) · Telehealth · (310) 206-6909
Dr. Maziar Amini, MD
Los Angeles, CA · $272 in drug and device payments (2025) · (323) 409-7556
Dr. Maziar Ghalili, D.O.
Los Angeles, CA · $142 in drug and device payments (2025) · (702) 671-2341
Dr. Maziyar Amini, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 226-7556
Dr. Meena Parikh
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 780-2216
Dr. Meera Modi, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (213) 250-3716
Dr. Megan Van Ligten, MD
Los Angeles, CA · $32 in drug and device payments (2025) · Telehealth · (800) 872-2273
Dr. Meghana Yanamandra, MD
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (323) 442-5100
Dr. Mehran Kashefi, D.O
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 478-3711
Dr. Mehran Sina, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 857-2000
Dr. Melanie Dewar, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 857-2000
Dr. Melanie Sapiandante, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (800) 954-8000
Dr. Melissa Ho, MD
Los Angeles, CA · $245 in drug and device payments (2025) · (755) 632-3409
Dr. Melissa Moseberry, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 754-4090
Dr. Melissa Rosenthal, MD
Los Angeles, CA · $123 in drug and device payments (2025) · (323) 783-4011
Dr. Melody Hermel, MD
Los Angeles, CA · $492 in drug and device payments (2025) · Telehealth · (323) 226-7556
Dr. Mercedes Montalvo, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (213) 217-5300
Dr. Merlie Pacheco-ocampo, M.D
Los Angeles, CA · No drug or device payments recorded (2025) · (213) 413-1255

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.