Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Greenwich Neonatology Associates, LLC

Neonatal-Perinatal Medicine Physician in Greenwich, CT · enumerated 2008 · authorized official Stylianos Theofanidis, Physician.

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

National Provider Identifier

1972769032

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Registry record

Entity type Organization (Type 2)

Legal business name Greenwich Neonatology Associates, LLC

Practice address 5 Perryridge Rd, Greenwich, CT, 06830

Phone (203) 863-3515

Enumeration date Jul 29, 2008

Last updated in NPPES Jul 29, 2008

Taxonomy & classification

2080N0001X Neonatal-Perinatal Medicine Physician Allopathic & Osteopathic Physicians · License 028038 (CT) Primary

Authorized official

Name Stylianos Theofanidis

Title Physician

Phone (203) 863-3515

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where is Greenwich Neonatology Associates, LLC located?

The practice location on file with NPPES is in Greenwich, CT.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2008-07-29. Verify at npiregistry.cms.hhs.gov.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-07-29.