Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Francis Mulroy, M.D.

Orthopaedic Surgery Physician in Chelsea, MA · enumerated 2006.

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

National Provider Identifier

1518920636

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Registry record

Entity type Individual (Type 1)

Name William Francis Mulroy

Credential M.D.

Sex Male

Practice address 111 Everett Ave, Suite 1a, Chelsea, MA, 02150

Phone (781) 235-3992

Fax (781) 235-3996

Enumeration date Apr 10, 2006

Last updated in NPPES Feb 7, 2017

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 58905 (MA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
3107965	Medicaid	MA	-
J12131	Other	MA	BCBS
725205	Other	MA	TUFTS
173787	Other	MA	HARVARD PLIGRIM
128044002	Other	MA	CIGNA
141133	Other	MA	AETNA
26497	Other	MA	FALLON

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

What is the NPI number for William Mulroy?

The National Provider Identifier (NPI) for William Mulroy is 1518920636, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Mulroy practice?

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

Other providers at this practice address

Browse all →

Michael Sandberg Internal Medicine Physician · Chelsea, MA NPI 1730176801 David Eisenberg Ophthalmology Physician · Chelsea, MA NPI 1376582379 David E Eisenberg MD PC Ophthalmology Physician · Chelsea, MA NPI 1235156282 Mark Gofstein Mental Health Counselor · Chelsea, MA NPI 1588733927 Occupational Orthopedic Surgery LLC Orthopaedic Surgery Physician · Chelsea, MA NPI 1639333214 Boston Orthopaedic PC Orthopaedic Surgery Physician · Chelsea, MA NPI 1578002366 Angela Sanchez Optician · Chelsea, MA NPI 1851867733

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-02-07.