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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

WILLIAM L BLACK M.D.
NPI 1780655860
Internal Medicine - Endocrinology, Diabetes & Metabolism in Somerville, MA

Active since January 27, 2006
40 HOLLAND ST, INTERNAL MEDICINE, SOMERVILLE, MA 02144(617) 629-6000 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jul 13, 2026, Sep 11, 2025 (2 updates tracked since 2025).

About William L Black M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM L BLACK M.D. (NPI 1780655860) is an individual endocrinology, diabetes & metabolism provider in Somerville, Massachusetts, licensed in Massachusetts (44271) and active in the NPI registry since January 2006.

NPPES Registry Identity

NPI1780655860
Entity TypeIndividualMale
Primary Taxonomy207RE0101X
Provider Legal NameWILLIAM L BLACKCredential: M.D.
Location Address40 HOLLAND ST, INTERNAL MEDICINESomerville, MA 02144-2705
Mailing Address147 Milk St, Provider Enrollment - 9th FloorBoston, MA 02109-4806 · (617) 559-8374 · Fax (617) 421-3487
Phone(617) 629-6000
Sole ProprietorNo
Enumeration DateJanuary 27, 2006
Last NPPES UpdateJuly 13, 20262 updates tracked since enumeration
✔ NPI 1780655860 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
License✔ Licensed in MA · 44271
Definition
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.
Also ListedInternal MedicineTaxonomy 207R00000X · License 44271 (MA)
40 HOLLAND ST, Somerville, MA 02144
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Other Identifiers 4

OtherPV509MA · Harvard Pilgrim
OtherE05162MA · Blue Cross
Other044271MA · Tufts
Medicaid2096129MA

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ELIZABETH AHLBORN NECHEV
Nurse Practitioner
40 HOLLAND ST
SOMERVILLE, MA 02144
Middlesex County (617) 657-6445
HENRY W STOLL PA
Physician Assistant (Medical)
40 HOLLAND ST
SOMERVILLE, MA 02144
Middlesex County (617) 629-6000
D. SCOTT GILBERT PA-C
Physician Assistant
40 HOLLAND ST
SOMERVILLE, MA 02144
Middlesex County (617) 654-7111
STEPHANIE E. NEALY RD, LDN
Dietitian, Registered
40 HOLLAND ST, NUTRITION
SOMERVILLE, MA 02144
Middlesex County (617) 629-6444
MARIA ELIZABETH HEDBERG FNP
Nurse Practitioner (Family)
40 HOLLAND ST
SOMERVILLE, MA 02144
Middlesex County (617) 629-6000
MRS. ANNETTE OHEARN 5532-DO-DO
Technician/Technologist (Optician)
40 HOLLAND ST
SOMERVILLE, MA 02144
Middlesex County (617) 629-6378
SHEENA ANN FREMAULT MACEDO FNP-C
Nurse Practitioner
40 HOLLAND ST
SOMERVILLE, MA 02144
Middlesex County (617) 629-6032
RICHARD MICHALOWSKI DMD
Dentist (General Practice)
40 HOLLAND ST
SOMERVILLE, MA 02144
Middlesex County (617) 629-6080

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Black's NPI number?

The NPI number for William Black is 1780655860. It was assigned to this individual provider in the NPPES registry on January 27, 2006.

Where is William Black located?

William Black practices at 40 Holland St Internal Medicine, Somerville, MA 02144. The listed phone number is (617) 629-6000.

What is William Black's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

When was this NPI record last updated?

The NPPES record for William Black was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 39 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.