Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MS. DIANE GUARDIANI PMHNP (APRN)
NPI 1316957285
Nurse Practitioner - Psychiatric/Mental Health in Niantic, CT

Q: What is Diane Guardiani's NPI number?

The NPI number for Diane Guardiani is 1316957285. It was assigned to this individual provider in the NPPES registry on August 9, 2006.

Q: What is Diane Guardiani's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.

Q: When was this NPI record last updated?

The NPPES record for Diane Guardiani was last updated on August 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 26 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since August 09, 2006

170 FLANDERS RD STE B1, NIANTIC, CT 06357(860) 385-6547(860) 807-1613 Get Directions Write a Review

NPPES record last updated: August 18, 2026. Verified against the NPPES registry weekly; last sync: September 06, 2026.

Record update history: Aug 18, 2026, Dec 7, 2021 (2 updates tracked since 2021).

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About Ms. Diane Guardiani Pmhnp (aprn) NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MS. DIANE GUARDIANI PMHNP (APRN) (NPI 1316957285) is an individual psychiatric/mental health provider in Niantic, Connecticut, licensed in Connecticut (2409) and active in the NPI registry since August 2006.

NPPES Registry Identity

NPI1316957285

Entity TypeIndividualFemale

Primary Taxonomy363LP0808X

Provider Legal NameMS. DIANE GUARDIANICredential: PMHNP (APRN)

Location Address170 FLANDERS RD STE B1Niantic, CT 06357-1211

Mailing Address170 Flanders Rd Ste B1Niantic, CT 06357-1211 · (860) 385-6547 · Fax (860) 807-1613

Phone(860) 385-6547

Fax(860) 807-1613

Sole ProprietorNo

Enumeration DateAugust 9, 2006

Last NPPES UpdateAugust 18, 20262 updates tracked since enumeration

NPPES CertifiedAugust 18, 2026

✔ NPI 1316957285 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse Practitioner · Psychiatric/Mental HealthPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363LP0808X

License✔ Licensed in CT · 2409

Also ListedNurse Practitioner · Acute CareTaxonomy 363LA2100X · License 002409 (CT)

170 FLANDERS RD STE B1, Niantic, CT 06357

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Other Identifiers 2

Medicaid1316957285CT

Medicaid1316957285RI

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Diane Guardiani's NPI number?

The NPI number for Diane Guardiani is 1316957285. It was assigned to this individual provider in the NPPES registry on August 9, 2006.

Where is Diane Guardiani located?

Diane Guardiani practices at 170 Flanders Rd Ste B1, Niantic, CT 06357. The listed phone number is (860) 385-6547.

What is Diane Guardiani's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.

When was this NPI record last updated?

The NPPES record for Diane Guardiani was last updated on August 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 26 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.