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 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. Elmera Peyman, DOOceanside, CA · No drug or device payments recorded (2025) ·
(760) 724-8411 Dr. Emory Winship, D.O.Oceanside, CA · No drug or device payments recorded (2025) ·
(760) 725-1213 Dr. Israa Najeeb, MD, M.M.B.CHOceanside, CA · $47 in drug and device payments (2025) ·
(833) 574-2273 Dr. Jeffrey Belanoff, MDOceanside, CA · No drug or device payments recorded (2025) ·
(760) 704-5630 Dr. Joseph Siegel, M.D.Oceanside, CA · No drug or device payments recorded (2025) ·
(424) 421-4234 Dr. Judith Generoso, D.O.Oceanside, CA · No drug or device payments recorded (2025) ·
(760) 725-1288 Dr. Karanbir Brar, M.D.Oceanside, CA · $536 in drug and device payments (2025) ·
(858) 209-3717 Dr. Kathleen Torres, MDOceanside, CA · No drug or device payments recorded (2025) · Telehealth ·
(760) 901-5060 Dr. Kaveh Farhoomand, DOOceanside, CA · No drug or device payments recorded (2025) ·
(760) 758-3830 Dr. Manika Talati, DOOceanside, CA · No drug or device payments recorded (2025) · Telehealth ·
(760) 901-5060 Dr. Matthew Long, DO, MPHOceanside, CA · No drug or device payments recorded (2025) ·
(760) 966-2499 Dr. May Al-mukhtar, MDOceanside, CA · $134 in drug and device payments (2025) ·
(760) 826-7223 Dr. Nadia Rizvi, M.D.Oceanside, CA · No drug or device payments recorded (2025) ·
(619) 259-0798 Dr. Nagi Ibrahim, MDOceanside, CA · No drug or device payments recorded (2025) ·
(760) 453-2700 Dr. Nancy Chang, M.D.Oceanside, CA · No drug or device payments recorded (2025) ·
(760) 721-3200 Dr. Paul Dang, MDOceanside, CA · $104 in drug and device payments (2025) ·
(480) 310-4363 Dr. Paul Lizotte, DOOceanside, CA · $430 in drug and device payments (2025) · Telehealth ·
(760) 330-5055 Dr. Phillip Poth, M.D.Oceanside, CA · No drug or device payments recorded (2025) ·
(760) 736-6767 Dr. Richard Day, MDOceanside, CA · No drug or device payments recorded (2025) ·
(760) 439-6581 Dr. Richard Petyn, M.D.Oceanside, CA · $331 in drug and device payments (2025) · Telehealth ·
(760) 901-5060 Dr. Robert Lee, MDOceanside, CA · No drug or device payments recorded (2025) ·
(760) 439-6581 Dr. Robert Mongeon, M.D.Oceanside, CA · No drug or device payments recorded (2025) ·
(760) 415-0071 Dr. Sabiha Pasha, M.D.Oceanside, CA · No drug or device payments recorded (2025) ·
(858) 382-1737 Dr. Frederick Fauvre, M.D.Ojai, CA · No drug or device payments recorded (2025) ·
(805) 646-8138 Dr. Robert Buckingham, MDOjai, CA · $48 in drug and device payments (2025) · Telehealth ·
(805) 646-0104 Dr. Dwayne Vanderberg, M.D.Olivehurst, CA · $70 in drug and device payments (2025) ·
(530) 743-4611 Dr. Karl Valrey, M.D.Olivehurst, CA · $70 in drug and device payments (2025) ·
(530) 743-4611 Dr. David Hirota, M.D.Ontario, CA · No drug or device payments recorded (2025) ·
(909) 566-0445 Dr. Dianne Quintana, M.D. Dr. Eric Gureghian, MDOntario, CA · No drug or device payments recorded (2025) ·
(909) 605-8000 Dr. Kishan Thapar, M.D.Ontario, CA · No drug or device payments recorded (2025) ·
(909) 932-1045 Dr. Liwanag Asuncion, M.D.Ontario, CA · No drug or device payments recorded (2025) ·
(440) 225-7095 Dr. Rodman St. Clair, M.D.Ontario, CA · No drug or device payments recorded (2025) ·
(909) 605-8015 Dr. Aladean Abdrabbo, M.D.Orange, CA · No drug or device payments recorded (2025) ·
(714) 633-1011 Dr. Alexander Watson, M.D.Orange, CA · No drug or device payments recorded (2025) ·
(714) 456-7890 Dr. Alex Zand, MDOrange, CA · $2,657 in drug and device payments (2025) · Telehealth ·
(714) 285-2311 Dr. Almaz Borjoev, MDOrange, CA · No drug or device payments recorded (2025) ·
(714) 771-8000 Dr. Amir Mekhail, MDOrange, CA · No drug or device payments recorded (2025) ·
(714) 456-8888 Dr. Anastasia Haddad, MDOrange, CA · No drug or device payments recorded (2025) ·
(714) 456-5691 Dr. Andrew Sous, DOOrange, CA · No drug or device payments recorded (2025) ·
(714) 456-7890 Dr. Andrew Wasson, MDOrange, CA · No drug or device payments recorded (2025) ·
(714) 456-5691 Dr. Andy Lin, MDOrange, CA · No drug or device payments recorded (2025) ·
(714) 456-5691 Dr. Bardia Sadr, MDOrange, CA · $774 in drug and device payments (2025) · Telehealth ·
(714) 266-1000 Dr. Bavani Nadeswaran, MDOrange, CA · No drug or device payments recorded (2025) · Telehealth ·
(714) 456-7002 Dr. Behdad Kavianpour, MD, MPH Dr. Bhakti Patel, M.D.Orange, CA · $23 in drug and device payments (2025) · Telehealth ·
(714) 771-8000 Dr. Brian BecerraOrange, CA · No drug or device payments recorded (2025) · Telehealth ·
(714) 456-5691 Dr. Brian MendozaOrange, CA · $3,221 in drug and device payments (2025) ·
(714) 456-8888 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.
- High blood pressure
- Type 2 diabetes
- High cholesterol
- Preventive care
- Chronic disease management
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.
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