Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Margaret C Haggerty, APRN

Adult Health Nurse Practitioner in Norwalk, CT · enumerated 2007.

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

National Provider Identifier

1558584078

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Registry record

Entity type Individual (Type 1)

Name Ms. Margaret C Haggerty

Credential APRN

Sex Female

Practice address 34 Maple St, Norwalk Hospital, Norwalk, CT, 06850

Phone (203) 852-2476

Fax (203) 852-2738

Enumeration date Apr 11, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

363LA2200X Adult Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 001073 (CT) Primary

APRN · Advanced Practice Registered Nurse: An umbrella credential covering NPs, CRNAs, CNMs, and clinical nurse specialists. About the APRN credential

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

What is the NPI number for Margaret Haggerty?

The National Provider Identifier (NPI) for Margaret Haggerty is 1558584078, a Type 1 (individual) record in the CMS NPPES registry.

Where does Margaret Haggerty practice?

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

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.