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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. Florina Geron, DO
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 262-9200
Dr. Gary Carlson, MD
Newport Beach, CA · $1,727 in drug and device payments (2025) · (949) 722-3300
Dr. Gilbert Goodman, M.D.
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 644-3560
Dr. Gina Cushman, NMD
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 715-9321
Dr. Gina Nguyen, M.D.
Newport Beach, CA · $257 in drug and device payments (2025) · (949) 610-7245
Dr. Gregory Katz, MD
Newport Beach, CA · $1,945 in drug and device payments (2025) · Telehealth · (949) 642-2333
Dr. Gregory Robertson, M.D.
Newport Beach, CA · $1,546 in drug and device payments (2025) · Telehealth · (949) 250-4244
Dr. Homayoun Daneschvar, MD
Newport Beach, CA · $409 in drug and device payments (2025) · Telehealth · (949) 805-1351
Dr. Jack Palmer, M.D.
Newport Beach, CA · $16 in drug and device payments (2025) · (949) 644-4114
Dr. Jacob Kunes, DO
Newport Beach, CA · No drug or device payments recorded (2025) · (630) 824-7801
Dr. James Fondren, M.D.
Newport Beach, CA · $69 in drug and device payments (2025) · (949) 574-1091
Dr. Janet Lee, D.O.
Newport Beach, CA · $247 in drug and device payments (2025) · Telehealth · (949) 835-3054
Dr. Jennifer Knox Barleben, M.D.
Newport Beach, CA · $346 in drug and device payments (2025) · (949) 574-0777
Dr. Joanna Libby, MD
Newport Beach, CA · No drug or device payments recorded (2025) · Telehealth · (949) 557-0830
Dr. John Storch, MD
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 697-9037
Dr. John Tencati, MD
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 650-3090
Dr. Joseph Ling, MD
Newport Beach, CA · $153 in drug and device payments (2025) · Telehealth · (949) 791-3001
Dr. Justin Sandhu, DO
Newport Beach, CA · $63 in drug and device payments (2025) · (949) 642-7757
Dr. Kambiz Karimi, MD
Newport Beach, CA · $46 in drug and device payments (2025) · (949) 791-3001
Dr. Larry Silverberg, MD
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 760-0190
Dr. Laura Salazar, MD
Newport Beach, CA · $111 in drug and device payments (2025) · Telehealth · (949) 791-3001
Dr. Leslie Meserve, M.D.
Newport Beach, CA · $246 in drug and device payments (2025) · (949) 558-0501
Dr. Magdi Messiha, M.D.
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 646-4355
Dr. Maily Creamer, D.O.
Newport Beach, CA · $138 in drug and device payments (2025) · Telehealth · (949) 791-3001
Dr. Mark Filidei, D.O.
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 851-1550
Dr. Micah Yu
Newport Beach, CA · $4,039 in drug and device payments (2025) · (949) 569-8877
Dr. Nancy Love, M.D.
Newport Beach, CA · $364 in drug and device payments (2025) · Telehealth · (949) 873-6858
Dr. Nhat Tran, M.D.
Newport Beach, CA · $17 in drug and device payments (2025) · (949) 610-7245
Dr. Nirupam Singh, MD
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 764-6876
Dr. Patrick Pan, MD
Newport Beach, CA · $34 in drug and device payments (2025) · (949) 200-7307
Dr. Pejman Badiei, M.D.
Newport Beach, CA · $46 in drug and device payments (2025) · (949) 873-6181
Dr. Peter Muran, MD
Newport Beach, CA · No drug or device payments recorded (2025) · (888) 315-4777
Dr. Rafael Penunuri, M.D.
Newport Beach, CA · $733 in drug and device payments (2025) · Telehealth · (949) 650-0587
Dr. Ramin Alizadeh, MD
Newport Beach, CA · $28 in drug and device payments (2025) · Telehealth · (949) 520-7322
Dr. Rejan Mccaskill, M.D., F.A.C.P.
Newport Beach, CA · $33 in drug and device payments (2025) · Telehealth · (949) 791-2000
Dr. Rena Ahuja, M.D.
Newport Beach, CA · $465 in drug and device payments (2025) · Telehealth · (949) 209-2789
Dr. Richard Harano, M.D
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 717-0072
Dr. Richard Patragnoni, MD
Newport Beach, CA · No drug or device payments recorded (2025) · (800) 928-1593
Dr. Rick Kenney, D.O.
Newport Beach, CA · No drug or device payments recorded (2025) · Telehealth · (949) 612-7358
Dr. Roger Sur, MD
Newport Beach, CA · $307 in drug and device payments (2025) · Telehealth · (949) 557-0830
Dr. Ronald Tilsen, M.D.
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 644-3559
Dr. Roopa Dillikar, M.D.
Newport Beach, CA · No drug or device payments recorded (2025) · Telehealth · (949) 557-0830
Dr. Russell Alterman, D.O.
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 250-4244
Dr. Russell Klein, MD
Newport Beach, CA · $2,863 in drug and device payments (2025) · (949) 274-8030
Dr. Ryan Klein, MD
Newport Beach, CA · $3,554 in drug and device payments (2025) · (949) 274-8030
Dr. Saja Shaheen Gleeson, MD
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 574-0777
Dr. Sameena Syed, DO
Newport Beach, CA · $147 in drug and device payments (2025) · Telehealth · (949) 557-0830
Dr. Sanaz Khorrami, M.D.
Newport Beach, CA · $1,078 in drug and device payments (2025) · Telehealth · (949) 322-5187
Dr. Scott Jenkins, MD
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 574-9300
Dr. Sevitlana Safaei, MD
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 650-2462

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.