NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Greenwich Hospital

General Acute Care Hospital in Greenwich, CT · enumerated 2007 · authorized official Diane Demain, Diabetes Nurse Educator.

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

National Provider Identifier

1326229279

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name Greenwich Hospital
Practice address 55 Holly Hill Ln, Greenwich, CT, 06830
Phone (203) 863-3786
Fax (203) 863-3744
Enumeration date Nov 20, 2007
Last updated in NPPES Nov 20, 2007

Taxonomy & classification

282N00000X General Acute Care Hospital Hospitals · License R35320 (CT) Primary

Authorized official

Name Diane Demain
Title Diabetes Nurse Educator
Phone (203) 863-3786

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

Who is the authorized official for Greenwich Hospital?
NPPES lists Diane Demain (Diabetes Nurse Educator) as the authorized official for this organization.
What is the NPI number for Greenwich Hospital?
The NPI for Greenwich Hospital is 1326229279, a Type 2 (organization) record in the CMS NPPES registry.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-11-20.