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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. Catherine Buell, DO
Santa Barbara, CA · $201 in drug and device payments (2025) · (805) 682-7111
Dr. Cathy Straits, MD
Santa Barbara, CA · $14 in drug and device payments (2025) · Telehealth · (805) 681-1777
Dr. Charity Dean, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 681-5488
Dr. Chelsea Dean, M.D.
Santa Barbara, CA · $416 in drug and device payments (2025) · (805) 681-5488
Dr. Christopher Thrash, M.D.
Santa Barbara, CA · $260 in drug and device payments (2025) · (805) 965-5588
Dr. Connor Triggs, D.O.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 898-3077
Dr. Cristopher Geiler, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 962-3667
Dr. Cynthia Bowers, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 898-0500
Dr. Daryl Burgess, D.O.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 681-1761
Dr. David Birken, MD
Santa Barbara, CA · $1,344 in drug and device payments (2025) · (805) 964-9858
Dr. David Cevallos, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 682-7111
Dr. David Dodson, M.D
Santa Barbara, CA · No drug or device payments recorded (2025) · Telehealth · (805) 681-1761
Dr. David Mandel, M.D.
Santa Barbara, CA · $23 in drug and device payments (2025) · Telehealth · (805) 681-1761
Dr. David Philippides, MD
Santa Barbara, CA · $53 in drug and device payments (2025) · (805) 879-8160
Dr. Dennis Baker, M.D
Santa Barbara, CA · $25 in drug and device payments (2025) · (805) 682-4011
Dr. Dorothy Holmes, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 617-7858
Dr. Douglas Cummings, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · Telehealth · (805) 683-0055
Dr. Douglas Fedder, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 569-7315
Dr. Elizabeth Pandian, M.D.
Santa Barbara, CA · $125 in drug and device payments (2025) · (805) 569-7315
Dr. Eric Trautwein, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · Telehealth · (805) 969-4025
Dr. Erin Moore, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 893-3371
Dr. Fen Liang, M.D.
Santa Barbara, CA · $1,935 in drug and device payments (2025) · Telehealth · (805) 886-4370
Dr. George Messerlian, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 681-1761
Dr. Gerald Svedlow, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 964-9858
Dr. Ginearosa Carbone, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 569-7315
Dr. Gloria Hadsall, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · Telehealth · (805) 681-1761
Dr. Grace Park, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 681-1760
Dr. Henning Ansorg, M.D.
Santa Barbara, CA · $274 in drug and device payments (2025) · (805) 681-5488
Dr. Howard Zisser, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 682-7638
Dr. Jacqueline Guerra, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 681-1744
Dr. Jacqueline Krock, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 563-0933
Dr. James Barbabella, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 681-1761
Dr. James Kahn, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 682-7411
Dr. Janet Pickthorn, MD
Santa Barbara, CA · $1,163 in drug and device payments (2025) · (805) 682-7567
Dr. Janine Kaufman, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 452-3121
Dr. Jasper Ip, MD
Santa Barbara, CA · $20 in drug and device payments (2025) · Telehealth · (805) 682-7111
Dr. Jeffrey Bourne, DO
Santa Barbara, CA · No drug or device payments recorded (2025) · Telehealth · (805) 391-3268
Dr. Jeffrey Hadsall, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · Telehealth · (805) 681-1761
Dr. Jeffrey Polito, M.D.
Santa Barbara, CA · $166 in drug and device payments (2025) · Telehealth · (805) 681-1490
Dr. Jesse Wood
Santa Barbara, CA · $920 in drug and device payments (2025) · (805) 569-7236
Dr. Jesus Fandino, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 682-7111
Dr. John La Puma
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 284-2238
Dr. John Sim, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · Telehealth · (805) 681-1761
Dr. Jon Uyesaka, MD
Santa Barbara, CA · $1,420 in drug and device payments (2025) · Telehealth · (805) 681-7204
Dr. Josephine Preciado, M.D.,
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 681-5461
Dr. Julia Billington, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · Telehealth · (805) 681-1761
Dr. Kristin Castorino, D.O.
Santa Barbara, CA · $35,311 in drug and device payments (2025) · (805) 682-7640
Dr. Kurt Ransohoff, M.D.
Santa Barbara, CA · $100 in drug and device payments (2025) · Telehealth · (805) 681-1761
Dr. Kyle Deacon, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · Telehealth · (805) 681-7602
Dr. Laurel Bliss, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · Telehealth · (805) 681-7500

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.