Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

William W. Tollefsen, MD

Individual provider Emergency Medicine Physician · NPI 1841462876

William W. Tollefsen, MD is an Emergency Medicine in Worcester, Massachusetts. Graduated from New York Medical College in 2008, 18 years ago. Practices with Coastal Medical Associates, a 446-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
18
Trained at
New York Medical College
Licensed in
MA
In the registry since
2008
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

119 Belmont St Dept OF Emergency Medicine
Worcester, MA 01605-2903
Phone: (508) 421-1400
Fax: (508) 421-1490
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 243758 (MA)

Record details

NPI number1841462876
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 31, 2008
Last updated in NPPESNovember 13, 2012
Mailing addressPo Box 415348, Boston, MA 02241-5348

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolNEW YORK MEDICAL COLLEGE
Graduated 2008 (18 years in practice)
Group practice Coastal Medical Associates — 446 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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