Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Stephen C O'Connor, MD

Diagnostic Radiology Physician in Springfield, MA · enumerated 2006.

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

National Provider Identifier

1427083237

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Registry record

Entity type Individual (Type 1)

Name Stephen C O'Connor

Credential MD

Sex Male

Practice address 759 Chestnut St, Radiology Department, Springfield, MA, 01107

Phone (413) 827-7426

Fax (413) 827-7407

Enumeration date Jul 11, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 078444 (MA) Primary

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 041669 (CT) 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
2013703	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

Where does Stephen O'Connor practice?

The practice location on file with NPPES is in Springfield, MA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Stephen O'Connor?

The National Provider Identifier (NPI) for Stephen O'Connor is 1427083237, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.