Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Katie Dympna Patricia Iadonisi, MSN, A-GNP-C, OCN

Adult Health Nurse Practitioner in South Weymouth, MA · enumerated 2022.

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

National Provider Identifier

1639808603

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Registry record

Entity type Individual (Type 1)

Name Katie Dympna Patricia Iadonisi

Credential MSN, A-GNP-C, OCN

Sex Female

Practice address 101 Columbian St, South Weymouth, MA, 02190

Phone (781) 624-4800

Enumeration date Jun 6, 2022

Last updated in NPPES Feb 2, 2023

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 5016311 (NC) Secondary

363LA2200X Adult Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 5016311 (NC) Secondary

363LG0600X Gerontology Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 5016311 (NC) Secondary

363LA2200X Adult Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License RN2361573 (MA) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Katie Iadonisi practice?

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

What is the NPI number for Katie Iadonisi?

The National Provider Identifier (NPI) for Katie Iadonisi is 1639808603, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-02-02.