Internal Medicine in Sonoma, California
Data updated monthly · Last refresh September 2026
12 Internal Medicine providers practice in Sonoma. Listings are drawn from federal public records and are not endorsements.
Internal Medicine providers in Sonoma
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. Brian Sebastian, MDSonoma, CA · No drug or device payments recorded (2025) · Telehealth ·
(707) 938-3870 Dr. Clinton Lane, M.D.Sonoma, CA · No drug or device payments recorded (2025) ·
(707) 938-2345 Dr. Guy Delorefice, M.D.Sonoma, CA · No drug or device payments recorded (2025) · Telehealth ·
(707) 938-1255 Dr. Jing Zhao, MDSonoma, CA · No drug or device payments recorded (2025) ·
(707) 939-6070 Dr. John Boyce-smith, MDSonoma, CA · No drug or device payments recorded (2025) ·
(415) 613-5338 Dr. Lawrence Huan, MDSonoma, CA · No drug or device payments recorded (2025) · Telehealth ·
(707) 938-3870 Dr. Marianne Kramer, MDSonoma, CA · No drug or device payments recorded (2025) ·
(707) 938-6556 Dr. Victor Iacovoni, M.D.Sonoma, CA · No drug or device payments recorded (2025) ·
(707) 935-5000 Dr. Walter Prehn, MDSonoma, CA · No drug or device payments recorded (2025) ·
(707) 495-7762 Dr. Yong Liu, M.D.Sonoma, CA · $605 in drug and device payments (2025) · Telehealth ·
(707) 933-0500 Conditions Internal Medicine providers in Sonoma, 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 Sonoma, California?There are 12 Internal Medicine providers with active NPI records practicing in Sonoma, according to federal NPPES data refreshed monthly.
What conditions do Internal Medicine providers in Sonoma treat?Internal Medicine providers in Sonoma 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 Sonoma Internal Medicine across California