Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mary Joan O'Neill, M.D.

Emergency Medicine Physician in Milford, MA · enumerated 2006.

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

National Provider Identifier

1861431959

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Registry record

Entity type Individual (Type 1)

Name Dr. Mary Joan O'Neill

Credential M.D.

Sex Female

Practice address 14 Prospect St, Milford, MA, 01757

Phone (508) 422-2810

Fax (508) 634-3276

Enumeration date Jun 5, 2006

Last updated in NPPES Sep 8, 2025

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 152946 (MA) Primary

2080P0204X Pediatric Emergency Medicine (Pediatrics) Physician Allopathic & Osteopathic Physicians · License 152946 (MA) Secondary

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
0008333	Other	-	NHP
34623	Other	-	FALLON
J18057	Other	-	BLUE CROSS BLUE SHIELD
999541	Other	-	NETWORK HEALTH
000000021079	Other	-	BMC HEALTHNET
613214	Other	-	HARVARD PILGRIM HEALTH CARE
930104656	Other	-	RAILROAD MEDICARE
152946	Other	-	TUFTS
3172155	Medicaid	MA	-

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.

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Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Mary Joan O'Neill?

Mary Joan O'Neill is registered in NPPES with the primary taxonomy of Emergency Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-08.