Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Stefan S. O'Connor, M.D.

Ophthalmology Physician in Wilmington, DE · enumerated 2006.

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

National Provider Identifier

1023089489

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Registry record

Entity type Individual (Type 1)

Name Dr. Stefan S. O'Connor

Credential M.D.

Sex Male

Practice address Wilmington, DE, 19808

Phone (302) 992-0238

Enumeration date Feb 1, 2006

Last updated in NPPES Aug 20, 2008

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License C1-0003896 (DE) Primary

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
0000415101	Medicaid	DE	-
510390465	Other	DE	CIGNA
0000415101	Other	DE	DELAWARE PHYSICIANS CARE
4344682	Other	DE	AETNA
510390465	Other	DE	BLUE CROSS BLUE SHIELD
0560630000	Other	DE	KEYSTONE/AMERIHEALTH

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 Stefan O'Connor practice?

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

What is the NPI number for Stefan O'Connor?

The National Provider Identifier (NPI) for Stefan O'Connor is 1023089489, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Franklin Ampadu Internal Medicine Physician · Wilmington, DE NPI 1245236843 Dorothy Moore Ophthalmology Physician · Wilmington, DE NPI 1063419349 Muhammad Haq Diagnostic Radiology Physician · Wilmington, DE NPI 1437150125 Delaware Eye M.D'S Associates Ophthalmology Physician · Wilmington, DE NPI 1811967490 Integrative & Family Healthcare LLC Family Medicine Physician · Wilmington, DE NPI 1235162256 Quest Diagnostics Clinical Lab Inc. Clinical Medical Laboratory · Wilmington, DE NPI 1003834060 Patricia Daly Clinical Social Worker · Wilmington, DE NPI 1225131915 Jose Marciano Castro Internal Medicine Physician · Wilmington, DE NPI 1083792352

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-08-20.