Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Michael Thomas O'Brien, RN

Registered Nurse in Milford, MA · enumerated 2021.

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

National Provider Identifier

1003408881

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Registry record

Entity type Individual (Type 1)

Name Michael Thomas O'Brien

Credential RN

Sex Male

Practice address 42 Cape Rd, Milford, MA, 01757

Phone (800) 853-2288

Enumeration date Feb 3, 2021

Last updated in NPPES Feb 3, 2021

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License RN2303490 (MA) Primary

RN · Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam. About the RN 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.

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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 Michael O'Brien?

Michael O'Brien is registered in NPPES with the primary taxonomy of Registered Nurse. 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 2021-02-03.