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

William Robert Barclay, CNP

Individual provider Nurse Practitioner · NPI 1144810573

William Robert Barclay, CNP is a Nurse Practitioner in Boston, Massachusetts. Qualified in 2019, 7 years ago. Practices with Massachusetts General Physicians Organization Inc, a 3,484-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
7
Licensed in
MA
In the registry since
2021
What do these letters mean?
CNP — Certified Nurse Practitioner
A certified nurse practitioner.

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Practice location Address checks out

55 Fruit St
Boston, MA 02114-2696
Phone: (617) 726-2000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Nurse Practitioner (primary) Taxonomy 363L00000X · Licence RN2320814 (MA)

Record details

NPI number1144810573
Entity typeIndividual (Type 1)
GenderMale
Credentials CNP
Sole proprietorYes
NPI enumeratedJanuary 20, 2021
Last updated in NPPESMarch 1, 2021
Certification dateMarch 1, 2021
Mailing address41 Pearl St Apt 2, Boston, MA 02125-4622

Medicare enrollment

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

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2019 (7 years in practice)
Group practice Massachusetts General Physicians Organization Inc — 3484 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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