Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Diane Guardiani, PMHNP (APRN)

Psychiatric/Mental Health Nurse Practitioner in Madison, CT · enumerated 2006 · practices at Grove School.

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

National Provider Identifier

1316957285

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Registry record

Entity type Individual (Type 1)

Name Ms. Diane Guardiani

Credential PMHNP (APRN)

Sex Female

Practice address 175 Copse Rd, Madison, CT, 06443

Phone (203) 245-2778

Fax (203) 245-8603

Enumeration date Aug 9, 2006

Last updated in NPPES Sep 22, 2025

Taxonomy & licenses

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 2409 (CT) Primary

363LA2100X Acute Care Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 002409 (CT) Secondary

Other identifiers

Identifier	Type	State	Issuer
1316957285	Medicaid	CT	-
1316957285	Medicaid	RI	-

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

Where does Diane Guardiani practice?

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

What is the NPI number for Diane Guardiani?

The National Provider Identifier (NPI) for Diane Guardiani is 1316957285, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-22.