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. Scott Gordon, MDLakewood, CA · $1,396 in drug and device payments (2025) ·
(562) 630-3105 Dr. Shirish Patel, M.DLakewood, CA · $190 in drug and device payments (2025) · Telehealth ·
(562) 925-7401 Dr. Su Yi, M.D.Lakewood, CA · No drug or device payments recorded (2025) · Telehealth ·
(562) 361-5650 Dr. Thucminh LeLakewood, CA · No drug or device payments recorded (2025) ·
(916) 549-1467 Dr. Woo Sung Ahn, MDLakewood, CA · $1,041 in drug and device payments (2025) ·
(562) 916-5020 Dr. Ajmel Sangha, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(619) 698-9375 Dr. Ali Alamar, M.D.La Mesa, CA · $652 in drug and device payments (2025) · Telehealth ·
(619) 461-3150 Dr. Anitha Garlapati, MDLa Mesa, CA · $141 in drug and device payments (2025) ·
(619) 740-6000 Dr. Ariana Feuvrier, MDLa Mesa, CA · No drug or device payments recorded (2025) ·
(619) 937-2243 Dr. Austin Howard, M.D.La Mesa, CA · No drug or device payments recorded (2025) · Telehealth ·
(619) 589-3017 Dr. Benjamin Goldenberg, M.D.La Mesa, CA · $134 in drug and device payments (2025) ·
(619) 740-6000 Dr. Caprice Thompson, DOLa Mesa, CA · $199 in drug and device payments (2025) ·
(619) 461-1920 Dr. Carla Fox, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(619) 251-8625 Dr. Christopher Makdesi, DOLa Mesa, CA · $115 in drug and device payments (2025) · Telehealth ·
(858) 499-2600 Dr. Darcy Mock, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(800) 290-5000 Dr. Denise Honer, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(619) 460-4050 Dr. Douglas Levey, M.D.La Mesa, CA · No drug or device payments recorded (2025) · Telehealth ·
(858) 499-2600 Dr. Elahe Toulouie, M.D.La Mesa, CA · $1,920 in drug and device payments (2025) ·
(619) 461-3515 Dr. Ellyn Levine, M.D.La Mesa, CA · $321 in drug and device payments (2025) ·
(619) 567-6914 Dr. Eva Leonard, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(619) 644-6500 Dr. Fatma Deif, M.D.La Mesa, CA · $1,567 in drug and device payments (2025) · Telehealth ·
(619) 660-1896 Dr. Felicia Briones-colman, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(619) 515-2585 Dr. Gunther Ottersbach, M.D. Dr. Hairan ZhuLa Mesa, CA · No drug or device payments recorded (2025) · Telehealth ·
(619) 851-0992 Dr. Hans Chin, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(619) 589-4108 Dr. Hau Tan, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(619) 287-8270 Dr. Jeanie Chung, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(858) 499-2601 Dr. Jeanne Gromer, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(619) 670-5400 Dr. Jesse Lyon, M.D.La Mesa, CA · No drug or device payments recorded (2025) · Telehealth ·
(619) 528-5000 Dr. John Fox, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(619) 701-6155 Dr. Karen Hutchinson, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(619) 964-4440 Dr. Khalil Soomro, MDLa Mesa, CA · $125 in drug and device payments (2025) ·
(619) 698-9375 Dr. Kimberly Nguyen, M.D. Dr. Kourosh Khamooshian, MDLa Mesa, CA · $1,320 in drug and device payments (2025) · Telehealth ·
(888) 475-6662 Dr. Leila Bolandgray, M.D.La Mesa, CA · $333 in drug and device payments (2025) ·
(619) 937-6349 Dr. Lisa O'connell, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(619) 698-0606 Dr. Lloyd Kuritsky, D.O.La Mesa, CA · $172 in drug and device payments (2025) ·
(619) 589-8626 Dr. Mansour Mofidi, DOLa Mesa, CA · $365 in drug and device payments (2025) ·
(619) 740-6000 Dr. Mariam Mostamand, M.D.La Mesa, CA · $120 in drug and device payments (2025) ·
(619) 461-1920 Dr. Mark Shaffer, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(619) 461-3717 Dr. Martin Nosan, MDLa Mesa, CA · No drug or device payments recorded (2025) ·
(619) 461-3717 Dr. Mary Alexander, M.D.La Mesa, CA · No drug or device payments recorded (2025) · Telehealth ·
(858) 499-2600 Dr. Max Macmillan, MDLa Mesa, CA · $387 in drug and device payments (2025) · Telehealth ·
(619) 670-5400 Dr. Michael Magpile, M.D.La Mesa, CA · $173 in drug and device payments (2025) · Telehealth ·
(619) 670-5400 Dr. Neema Shakibai, M.D.La Mesa, CA · $147 in drug and device payments (2025) ·
(858) 499-2711 Dr. Paul Abou, MDLa Mesa, CA · $304 in drug and device payments (2025) ·
(619) 465-0711 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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