Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John J Tierney, DO

Specialist in Dedham, MA · enumerated 2006.

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

National Provider Identifier

1417913047

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Registry record

Entity type Individual (Type 1)

Name John J Tierney

Credential DO

Sex Male

Practice address 200 Providence Hwy, Suite 202, Dedham, MA, 02026

Phone (781) 461-4543

Enumeration date Apr 22, 2006

Last updated in NPPES Jan 4, 2013

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 76683 (MA) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO 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 John Tierney?

John Tierney is registered in NPPES with the primary taxonomy of Specialist. 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 2013-01-04.