Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Catherine Susan Day, PT MHS

Physical Therapist in Fairfield, CT · enumerated 2007.

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

National Provider Identifier

1790981199

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Registry record

Entity type Individual (Type 1)

Name Catherine Susan Day

Credential PT MHS

Sex Female

Practice address 400 Mill Plain Rd, Fairfield, CT, 06824

Phone (203) 255-3573

Enumeration date Jun 22, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

225100000X Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 1932 (CT) Primary

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

Is NPI 1790981199 active?

Yes, as of the latest NPPES snapshot, NPI 1790981199 is active (record last updated 2007-07-08).

How do I verify Catherine Day's NPI record?

Cross-check NPI 1790981199 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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