Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Thomas M Oconnor, DO

Vascular Surgery Physician in Lancaster, PA · enumerated 2005.

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

National Provider Identifier

1144213992

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Registry record

Entity type Individual (Type 1)

Name Thomas M Oconnor

Credential DO

Sex Male

Practice address 2102 Harrisburg Pike, Lancaster, PA, 17601

Phone (717) 544-9400

Fax (717) 544-9401

Enumeration date Aug 26, 2005

Last updated in NPPES Jun 6, 2025

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License OS009572L (PA) Secondary

2086S0129X Vascular Surgery Physician Allopathic & Osteopathic Physicians · License OS009572L (PA) 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
50009563	Other	PA	CAPITAL BLUE CROSS
20020201	Other	PA	MERCY HEALTH PLAN
963231	Other	-	BLUE SHIELD OF PA
001602890	Medicaid	PA	-
P00000115	Other	-	RAILROAD MEDICARE

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

What specialty is Thomas Oconnor?

Thomas Oconnor is registered in NPPES with the primary taxonomy of Vascular Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-06-06.