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

Dr. William Joseph Sullivan, DNP, FNP

Individual provider Family Nurse Practitioner · NPI 1184991150

Dr. William Joseph Sullivan, DNP, FNP is a Family Nurse Practitioner in Leeds, Massachusetts. Licensed in Massachusetts. Registered with an NPI since 2011.

Licensed in
MA
In the registry since
2011
What do these letters mean?
DNP — Doctor of Nursing Practice
The highest clinical degree in nursing.
FNP — Family Nurse Practitioner
A nurse practitioner who treats patients of all ages, much like a family doctor.

See every abbreviation used in this directory →

Practice location Address checks out

421 N Main St
Leeds, MA 01053-9764
Phone: (413) 627-2625
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Nurse Practitioner (primary) Taxonomy 363LF0000X · Licence 215708 (MA)

Record details

NPI number1184991150
Entity typeIndividual (Type 1)
GenderMale
Credentials DNP , FNP
Sole proprietorNo
NPI enumeratedNovember 19, 2011
Last updated in NPPESNovember 19, 2011

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