Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Thomas Edward O'Leary, D.O.

Pediatrics Physician in Dudley, MA · enumerated 2005.

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

National Provider Identifier

1497742803

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Registry record

Entity type Individual (Type 1)

Name Dr. Thomas Edward O'Leary

Credential D.O.

Sex Male

Practice address 161 W Main St, Dudley, MA, 01571

Phone (508) 949-7707

Fax (508) 949-6737

Enumeration date Sep 30, 2005

Last updated in NPPES Dec 21, 2011

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 217822 (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

Other identifiers

Identifier	Type	State	Issuer
2020360	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 Thomas O'Leary?

Thomas O'Leary is registered in NPPES with the primary taxonomy of Pediatrics 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 2011-12-21.