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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. Daniel Grosu, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (732) 322-2813
Dr. Daniel Hernandez, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Danielle Demarchi, DO
San Diego, CA · No drug or device payments recorded (2025) · (505) 859-2147
Dr. Daniel Lee, M.D.
San Diego, CA · $33,111 in drug and device payments (2025) · Telehealth · (800) 926-8273
Dr. Daniel Lee, M.D.
San Diego, CA · $22 in drug and device payments (2025) · (858) 552-8585
Dr. Danielle Fam, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 663-5344
Dr. Daniel Maher, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 532-6827
Dr. Dan Tong, MD
San Diego, CA · $37 in drug and device payments (2025) · (619) 528-5000
Dr. David Ashley, DO, MPH, MS
San Diego, CA · No drug or device payments recorded (2025) · (858) 499-2600
Dr. David Barold, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 269-1056
Dr. David Bittleman, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 400-5050
Dr. David Buccigrossi, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. David Chang, M.D.
San Diego, CA · $726 in drug and device payments (2025) · (619) 286-8803
Dr. David Fan, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (800) 290-5000
Dr. David Hall, MD
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (858) 499-2708
Dr. David Heller, M.D.
San Diego, CA · $742 in drug and device payments (2025) · Telehealth · (858) 764-3320
Dr. David Hibbert, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 657-7000
Dr. David Kaufer, MD
San Diego, CA · $128 in drug and device payments (2025) · Telehealth · (760) 480-4310
Dr. David La Vine, M.D.
San Diego, CA · $689 in drug and device payments (2025) · Telehealth · (858) 764-3100
Dr. David Liu, M.D.
San Diego, CA · $314 in drug and device payments (2025) · Telehealth · (619) 849-4440
Dr. David Lush, M.D.
San Diego, CA · $408 in drug and device payments (2025) · Telehealth · (858) 764-3000
Dr. David Nitta, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 532-6827
Dr. David Ries, MD
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (619) 471-9186
Dr. David Rousseau, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 532-8225
Dr. David Vinh-phuc Nguyen, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 899-3608
Dr. David Ward, M.D.
San Diego, CA · $5,000 in drug and device payments (2025) · (619) 543-5800
Dr. Dawn Quigley, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 881-9169
Dr. Dayna Arnstein Temby, M. D.
San Diego, CA · $24 in drug and device payments (2025) · (858) 764-3345
Dr. Deanna Hill, MD
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (619) 471-9250
Dr. Deanna Oliver, MD
San Diego, CA · $401 in drug and device payments (2025) · Telehealth · (844) 200-2426
Dr. Debra Rosenberg, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 543-7768
Dr. Denise Mai, MD
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (619) 543-6268
Dr. Derek Booth, DO
San Diego, CA · No drug or device payments recorded (2025) · (408) 691-9354
Dr. Derek Juang, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 552-8585
Dr. Dhwanil Vyas, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (800) 926-8273
Dr. Dhwanishiva Vasani, M.D.
San Diego, CA · $459 in drug and device payments (2025) · (858) 939-3400
Dr. Diamond Berg, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 543-6268
Dr. Diana Marquardt, MD
San Diego, CA · $365 in drug and device payments (2025) · (619) 563-0507
Dr. Diego Jarrin, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 400-5050
Dr. Diego Vargas Valdivieso
San Diego, CA · No drug or device payments recorded (2025) · (925) 876-1442
Dr. Diep Dao, D.O.
San Diego, CA · No drug or device payments recorded (2025) · (858) 232-4778
Dr. Dipul Kansagara, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Donald Brandon, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 291-2321
Dr. Donald Tecca, MD
San Diego, CA · $16 in drug and device payments (2025) · (858) 268-1111
Dr. Don Hammi, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Doreen Ibrahim, M.D
San Diego, CA · No drug or device payments recorded (2025) · (858) 616-2600
Dr. D Scott Upton, M.D.
San Diego, CA · $552 in drug and device payments (2025) · Telehealth · (858) 541-0181
Dr. Dung Huynh, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Dustin Cladera, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 499-2600
Dr. Eaman Al-hassan, MD
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (800) 926-8273

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.