Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Mary Kolesar, LCSW

School Social Worker in Mastic Beach, NY · enumerated 2010 · practices at William Floyd School District.

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

National Provider Identifier

1578872271

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Registry record

Entity type Individual (Type 1)

Name Mrs. Mary Kolesar

Credential LCSW

Sex Female

Practice address 240 Mastic Beach Rd, Mastic Beach, NY, 11951

Phone (631) 874-1103

Enumeration date Sep 28, 2010

Last updated in NPPES Sep 28, 2010

Taxonomy & licenses

1041S0200X School Social Worker Behavioral Health & Social Service Providers · License 73074760 (NY) Primary

LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW credential

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

Is NPI 1578872271 active?

Yes, as of the latest NPPES snapshot, NPI 1578872271 is active (record last updated 2010-09-28).

How do I verify Mary Kolesar's NPI record?

Cross-check NPI 1578872271 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-09-28.