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

MARY ANN DEFALCO NP
NPI 1144208570
Nurse Practitioner in West Islip, NY

Q: What is Mary Ann Defalco's NPI number?

The NPI number for Mary Ann Defalco is 1144208570. It was assigned to this individual provider in the NPPES registry on January 5, 2006.

Q: What is Mary Ann Defalco's specialty?

The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.

Q: When was this NPI record last updated?

The NPPES record for Mary Ann Defalco was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 33 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 January 05, 2006

540 UNION BLVD, WEST ISLIP, NY 11795(631) 669-2555 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

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About Mary Ann Defalco Np NPPES

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

MARY ANN DEFALCO NP (NPI 1144208570) is an individual nurse practitioner in West Islip, New York, licensed in New York (F3042641) and active in the NPI registry since January 2006.

NPPES Registry Identity

NPI1144208570

Entity TypeIndividualFemale

Primary Taxonomy363L00000X

Provider Legal NameMARY ANN DEFALCOCredential: NP

Location Address540 UNION BLVDWest Islip, NY 11795

Mailing Address540 Union BlvdWest Islip, NY 11795 · (631) 669-2555 · Fax (631) 669-5787

Phone(631) 669-2555

Sole ProprietorNo

Enumeration DateJanuary 5, 2006

Last NPPES UpdateJuly 13, 2026

✔ NPI 1144208570 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363L00000X

License✔ Licensed in NY · F3042641

Definition

(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.

540 UNION BLVD, West Islip, NY 11795

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Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ASHLEY ANNE HUBBARD NP-C

Nurse Practitioner (Adult Health)