Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Patrick Brennan Jr., PHARMD

Pharmacotherapy Pharmacist in West Roxbury, MA · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1659319507

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Registry record

Entity type Individual (Type 1)

Name Dr. William Patrick Brennan Jr.

Credential PHARMD

Sex Male

Practice address 1400 Vfw Pkwy, West Roxbury, MA, 02132

Phone (857) 203-5213

Fax (857) 203-5625

Enumeration date Jun 3, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

1835P1200X Pharmacotherapy Pharmacist Pharmacy Service Providers · License 24041 (MA) Primary

PHARMD · Doctor of Pharmacy: A licensed pharmacist with a professional doctorate in pharmacy. About the PHARMD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does William Brennan practice?

The practice location on file with NPPES is in West Roxbury, MA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for William Brennan?

The National Provider Identifier (NPI) for William Brennan is 1659319507, a Type 1 (individual) record in the CMS NPPES registry.

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Shahe Fereshetian Plastic Surgery Physician · West Roxbury, MA NPI 1447244173 Yesha Barker Emergency Medicine Physician · West Roxbury, MA NPI 1013903384 Michael Charness Neurology Physician · West Roxbury, MA NPI 1457341083 Christopher O Donnell Cardiovascular Disease Physician · Boston, MA NPI 1063402246 Paul Conlin Endocrinology, Diabetes & Metabolism Physician · West Roxbury, MA NPI 1023008257 Emily Wan Pulmonary Disease Physician · West Roxbury, MA NPI 1265423701 Albert Kim Clinical Cardiac Electrophysiology Physician · Boston, MA NPI 1184615361 John Sapirstein Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · West Roxbury, MA NPI 1235110982

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.