Internal Medicine Providers in Sonoma, CA
Browse 12 Internal Medicine providers listed in NPPES with a practice address in Sonoma, California.
How Sonoma compares with the U.S.
Sonoma has 112 clinicians in Internal Medicine per 100,000 residents, 2.5 times the U.S. rate of 44.
That is 12 active clinicians in Internal Medicine with a practice address in Sonoma, for a population of 10,670.
The California rate is 45 per 100,000 residents.
What these numbers mean
Clinicians per 100,000 residents compares places of different sizes. We count active clinicians who list a practice address in the area in the federal NPI registry (NPPES) and divide by the number of people who live there, according to the U.S. Census Bureau. The U.S. rate is the same calculation for the whole country.
A higher number does not mean it is easier to get an appointment, that wait times are shorter, or that care is better. It also does not show how many clinicians are accepting new patients or which insurance plans they take. A lower number does not by itself mean there is a shortage.
City counts use the city name in each clinician's practice address. That postal city can cover a larger or smaller area than the city limits the Census Bureau uses for population, and many clinicians list only one address even if they work in several places. Cities with hospitals or large medical centers often list more specialists than the number of residents alone would suggest, because patients also come from nearby areas.
Too few clinicians in Internal Medicine in Sonoma are listed in the CMS Medicare file to report Medicare assignment or telehealth shares.
These figures summarize public federal data. They do not measure quality of care, appointment availability, or whether a clinician accepts your insurance or new patients. Registry addresses can be out of date. Please confirm details directly with the office and your plan. This information is not medical advice.
Prepared by T-MedInfo from NPPES, CMS and U.S. Census Bureau data. Questions or corrections: support@true-medinfo.com · Methodology
Sources: Clinician counts and practice addresses: NPPES NPI Registry, Centers for Medicare & Medicaid Services (CMS), data as of August 2026. Population: U.S. Census Bureau, American Community Survey 2020-2024 5-Year Estimates, Table B01003 (Total Population).
Dr. S Douglas Campbell , MD
Internal Medicine
Dr. Guy Delorefice , MD
Internal Medicine
Dr. Lawrence M Huan , MD
Internal Medicine
Dr. Yong Qing Liu , MD
Internal Medicine
Dr. Brian Martin Sebastian , MD
Internal Medicine
Dr. Dennis James Verducci , MD
Internal Medicine
Dr. Jing Zhao , MD
Internal Medicine
Dr. John Gifford Boyce-Smith , MD
Internal Medicine
Dr. Victor E Iacovoni , MD
Internal Medicine
Dr. Marianne Louise Kramer , MD
Internal Medicine
Dr. Clinton Lane , MD
Internal Medicine
Dr. Walter C Prehn , MD
Internal Medicine
Frequently Asked Questions about Internal Medicine in Sonoma
Each practitioner profile shows the NUCC taxonomy code and any state license number the practitioner reported to NPPES, plus a link to the California licensing board lookup. NPPES entries are self-reported; current license status is published only by the state board.
This list shows NPI records that are active in NPPES. A deactivated NPI keeps its profile with the deactivation date and practice history; find it with the site search by name or NPI number.
Other Specialties in Sonoma
Internal Medicine Providers in Other California Cities
Cities with the most listed practitioners first.