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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. Kelvin Mai, DO
Santa Ana, CA · $6,240 in drug and device payments (2025) · Telehealth · (714) 332-1069
Dr. Khai Do, M.D.
Santa Ana, CA · $2,371 in drug and device payments (2025) · (909) 621-3012
Dr. Madhavi Mulye, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 424-0800
Dr. Meena Meka, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · Telehealth · (714) 979-5734
Dr. Nabil Gemayel
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 543-0709
Dr. Navneet Singh, D.O.
Santa Ana, CA · $2,344 in drug and device payments (2025) · Telehealth · (714) 542-1331
Dr. Pelma Tabrizi, M.D.
Santa Ana, CA · $92 in drug and device payments (2025) · Telehealth · (714) 884-4855
Dr. Quang Vo, MD
Santa Ana, CA · $129 in drug and device payments (2025) · (714) 317-4998
Dr. Quy Nguyen, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 834-8017
Dr. Richard Bock, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 542-3581
Dr. Robert Castro, DO
Santa Ana, CA · $1,025 in drug and device payments (2025) · (714) 754-1684
Dr. Robin Hatam, D.O.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 929-2300
Dr. Ronnie Alas, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 929-2300
Dr. Samer Moghaddam, M.D.
Santa Ana, CA · $583 in drug and device payments (2025) · (949) 705-8485
Dr. Sam Nakamura, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 623-2383
Dr. Sashini Weeraman, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 999-9999
Dr. Thai Nguyen, M.D.
Santa Ana, CA · $1,502 in drug and device payments (2025) · (714) 775-8090
Dr. Theresa Thanh Nguyen, M.D.
Santa Ana, CA · $1,666 in drug and device payments (2025) · (714) 775-8090
Dr. Tiffany Prachachalerm, DO
Santa Ana, CA · $294 in drug and device payments (2025) · (714) 954-0432
Dr. Trung Pham, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 559-3846
Dr. Venkata Pulakanti, M.D.
Santa Ana, CA · $208 in drug and device payments (2025) · Telehealth · (909) 496-1195
Dr. Wesam Houshan, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 992-1182
Dr. Xinming Fu, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 558-8033
Dr. Yana Stolyarov, M.D
Santa Ana, CA · $149 in drug and device payments (2025) · Telehealth · (714) 929-2300
Dr. Akriti Kaur, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 879-8160
Dr. Alexander Morf, M.D.
Santa Barbara, CA · $1,441 in drug and device payments (2025) · Telehealth · (805) 964-9858
Dr. Alice Lin, DO
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 682-7111
Dr. Andrew Gersoff, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 681-5488
Dr. Andrew Rhinehart, MD, FACP, FACE, CDCE
Santa Barbara, CA · $339 in drug and device payments (2025) · (805) 682-7640
Dr. Angelina Dukesherer, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 464-6104
Dr. Anh Lam, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 898-3077
Dr. Anita Rai, M.D.
Santa Barbara, CA · $1,400 in drug and device payments (2025) · Telehealth · (805) 964-9858
Dr. Anusha Sabanayagam, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 569-7315
Dr. Arielle Kanner, D.O.
Santa Barbara, CA · $582 in drug and device payments (2025) · Telehealth · (805) 563-7010
Dr. Arsen Mkrtchyan, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 682-7111
Dr. Austin Moser, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 569-7315
Dr. Avery Wilmanns, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · Telehealth · (805) 681-1761
Dr. Barbara Hrach, M.D.
Santa Barbara, CA · $497 in drug and device payments (2025) · Telehealth · (805) 898-0500
Dr. Bashir Allahdadi, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (916) 547-9410
Dr. Benjamin Diener, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 681-7500
Dr. Benjamin Hassan, M.D.
Santa Barbara, CA · $55 in drug and device payments (2025) · Telehealth · (805) 898-3100
Dr. Bikram Otal, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · (818) 483-3858
Dr. Bonnie Prinz, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 681-1760
Dr. Bradley Joseph, M.D.
Santa Barbara, CA · $105 in drug and device payments (2025) · (805) 729-5252
Dr. Brandon Boesch, D.O.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 879-8160
Dr. Brett Trzcinski, MD
Santa Barbara, CA · $53 in drug and device payments (2025) · Telehealth · (805) 682-7111
Dr. Brittany Bryan, M.D.
Santa Barbara, CA · $218 in drug and device payments (2025) · Telehealth · (805) 682-3771
Dr. Bruce Bailey, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 687-6674
Dr. Bryce Holderness, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · Telehealth · (805) 681-7602
Dr. Burgundy Tyrrel Signorini, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 682-7111

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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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.