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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. Rebecca Levasseur, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Rebecca Preziosi, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (858) 499-2600
Dr. Rebecca Shragge, DO
San Diego, CA · $598 in drug and device payments (2025) · Telehealth · (619) 278-3300
Dr. Regina Connell, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 515-2400
Dr. Regina Mirski, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 594-5281
Dr. Reice Robinson, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 543-6268
Dr. Renato Bobadilla Leon, MD
San Diego, CA · $110 in drug and device payments (2025) · (800) 926-8273
Dr. Renee Smilde, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 294-8111
Dr. Reza Elahimehr, M.D.
San Diego, CA · $2,140 in drug and device payments (2025) · Telehealth · (619) 471-0753
Dr. Reza Khoshini, MD
San Diego, CA · $2,227 in drug and device payments (2025) · Telehealth · (858) 292-7527
Dr. Richard Daly, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 552-8585
Dr. Richard Gilroy, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 485-5061
Dr. Richard Haubrich, M.D.
San Diego, CA · $267 in drug and device payments (2025) · (619) 543-8080
Dr. Richard Hayes, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Richard Kornbluth, M.D., PH.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 846-8603
Dr. Richard Moon, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Rio Dickens, M.D.
San Diego, CA · $39 in drug and device payments (2025) · Telehealth · (858) 764-3000
Dr. Rita Paulis, MBCHB
San Diego, CA · $16 in drug and device payments (2025) · (858) 552-8585
Dr. Rita Starritt, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (303) 399-0365
Dr. Robert Deiss, MD
San Diego, CA · $192 in drug and device payments (2025) · Telehealth · (800) 926-8273
Dr. Robert Felder, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Robert Fox, MD
San Diego, CA · $9,760 in drug and device payments (2025) · (858) 945-1064
Dr. Robert Geis
San Diego, CA · $821 in drug and device payments (2025) · (619) 453-9916
Dr. Robert Kaplan, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 764-3000
Dr. Robert Lew, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Robert Morehead, MD
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (502) 939-2782
Dr. Robert Roth, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5000
Dr. Robert Smith, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 642-1144
Dr. Robert Terkeltaub, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 657-6110
Dr. Robert Thomas Iii, M.D., PHD
San Diego, CA · $21 in drug and device payments (2025) · (619) 543-6268
Dr. Robin Moyer, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 552-8585
Dr. Rodney Hood, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 262-7523
Dr. Rodrigo Naranjo, M.D.
San Diego, CA · $22 in drug and device payments (2025) · (858) 279-0925
Dr. Rolf Ehlers, M.D.
San Diego, CA · $1,436 in drug and device payments (2025) · Telehealth · (858) 541-0181
Dr. Roman Marciniak
San Diego, CA · No drug or device payments recorded (2025) · (619) 294-8111
Dr. Roman Sapozhnikov, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 515-2300
Dr. Ronald Fischer, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 273-1231
Dr. Ronald Schlotfeldt, M.D.
San Diego, CA · $1,057 in drug and device payments (2025) · Telehealth · (619) 278-3300
Dr. Ronald Shazer, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 453-7200
Dr. Ronelle Campbell, D.O.
San Diego, CA · No drug or device payments recorded (2025) · (619) 543-2535
Dr. Rong Shi, M.D.
San Diego, CA · $41 in drug and device payments (2025) · (619) 297-3737
Dr. Roozbeh Badii, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (860) 538-8938
Dr. Rosalba Rodriguez-de La Sierra, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 993-7775
Dr. Rosemary Garcia, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 692-8550
Dr. Rouzbeh Tehrani, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 999-1873
Dr. Rudolf Herzog, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 615-0842
Dr. Ruhong Ma, D.O.
San Diego, CA · No drug or device payments recorded (2025) · (619) 528-5435
Dr. Rujing Shi, DO
San Diego, CA · No drug or device payments recorded (2025) · (619) 260-7220
Dr. Ruo Zhu, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 532-6400
Dr. Rustin Zomorodi, MD, MPH
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.