Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

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

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: July 19, 2026.

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
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

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.

Internal Medicine (Cardiovascular Disease)
540 UNION BLVD
WEST ISLIP, NY 11795
Internal Medicine (Cardiovascular Disease)
540 UNION BLVD
WEST ISLIP, NY 11795
Internal Medicine (Cardiovascular Disease)
540 UNION BLVD
WEST ISLIP, NY 11795
Internal Medicine (Cardiovascular Disease)
540 UNION BLVD
WEST ISLIP, NY 11795
Physician Assistant (Medical)
540 UNION BLVD
WEST ISLIP, NY 11795
Internal Medicine (Cardiovascular Disease)
540 UNION BLVD
WEST ISLIP, NY 11795
Physician Assistant
540 UNION BLVD
WEST ISLIP, NY 11795
Nurse Practitioner (Family)
540 UNION BLVD
WEST ISLIP, NY 11795

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1144208570, enumerated as an "individual" on January 05, 2006.

The provider is located at 540 UNION BLVD WEST ISLIP, NY 11795 and the phone number is (631) 669-2555.

Nurse Practitioner with taxonomy code 363L00000X.