Dr. William Tollefsen, MD

With 18 years of practice, Dr. William Tollefsen is an established healthcare provider, MD, after earning their medical degree at New York Medical College in 2008. Dr. currently practices across 4 facilities, including Umass Memorial Medical Group Inc in Worcester, Massachusetts. Their National Provider Identifier (NPI) is 1841462876, and the profile below combines data from CMS NPPES, Medicare billing records, the HHS OIG exclusion list, and — where available — CMS Open Payments, Medicare Utilization, and Part D prescriber summaries.

Dr. William Tollefsen's practice is located in ZIP 01605 (Worcester, Massachusetts), which has an overall CartoChrome Healthcare Access Score of 76/100 (Excellent Access). Patients in this area have comparatively strong access to primary care, specialists, and hospital services.

CMS Medicare data shows Dr. William Tollefsen as a lower-volume healthcare provider, treating approximately 380 Medicare beneficiaries and delivering 528 services in the most recent reporting year. That panel size indicates a smaller, more selective practice pattern.

Under the Physician Payments Sunshine Act, CMS reports that Dr. William Tollefsen received $181 in industry payments in 2023. Payments at this scale are typical for most practicing physicians and generally reflect routine educational activities.