Internal Medicine in San Marcos, California
Data updated monthly · Last refresh September 2026
17 Internal Medicine providers practice in San Marcos. Listings are drawn from federal public records and are not endorsements.
Internal Medicine providers in San Marcos
Listed alphabetically. 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. Arturo Tolentino, M.D.San Marcos, CA · $78 in drug and device payments (2025) ·
(833) 867-4642 Dr. Francisco Marquez, M.D.San Marcos, CA · No drug or device payments recorded (2025) ·
(760) 510-4313 Dr. Izabela Witczak, M.DSan Marcos, CA · $43 in drug and device payments (2025) ·
(760) 736-6700 Dr. Joseph Czvik, MDSan Marcos, CA · $356 in drug and device payments (2025) ·
(760) 471-1020 Dr. Justin Charles, MDSan Marcos, CA · $567 in drug and device payments (2025) · Telehealth ·
(442) 372-2330 Dr. Kathryn Germeraad, DOSan Marcos, CA · No drug or device payments recorded (2025) · Telehealth ·
(858) 554-1212 Dr. Lauren Clarine, D.O.San Marcos, CA · No drug or device payments recorded (2025) ·
(877) 236-0333 Dr. Lauren Jefferis, MDSan Marcos, CA · No drug or device payments recorded (2025) ·
(760) 736-6700 Dr. Marie Russell, MD.San Marcos, CA · $141 in drug and device payments (2025) ·
(760) 736-8689 Dr. Meenu Bawa, M.DSan Marcos, CA · No drug or device payments recorded (2025) · Telehealth ·
(619) 323-8789 Dr. Minh Nguyen, M.D.San Marcos, CA · $22 in drug and device payments (2025) ·
(619) 757-0141 Dr. Mona Arasoghli, M.D.San Marcos, CA · No drug or device payments recorded (2025) ·
(800) 290-5000 Dr. Samuel Poniachik, M.DSan Marcos, CA · $546 in drug and device payments (2025) ·
(760) 736-6700 Dr. Shreya Chandra, MDSan Marcos, CA · No drug or device payments recorded (2025) ·
(760) 736-6700 Dr. Sze Hoay Ding, M.D.San Marcos, CA · No drug or device payments recorded (2025) ·
(619) 318-7476 Dr. Tina Tran, MDSan Marcos, CA · $42 in drug and device payments (2025) · Telehealth ·
(760) 806-5700 Dr. Tyler Sprague, D.O.San Marcos, CA · No drug or device payments recorded (2025) · Telehealth ·
(760) 304-1383 Conditions Internal Medicine providers in San Marcos, 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 San Marcos, California?There are 17 Internal Medicine providers with active NPI records practicing in San Marcos, according to federal NPPES data refreshed monthly.
What conditions do Internal Medicine providers in San Marcos treat?Internal Medicine providers in San Marcos 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 records 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.
All specialties in San Marcos Internal Medicine across California