Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Deanne Mastrangelo, MSS, LSW

Social Worker in Paoli, PA · enumerated 2008.

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

National Provider Identifier

1255589115

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Registry record

Entity type Individual (Type 1)

Name Deanne Mastrangelo

Credential MSS, LSW

Sex Female

Practice address 1440 Russell Rd, Paoli, PA, 19301

Phone (610) 644-6464

Fax (610) 644-4066

Enumeration date Sep 4, 2008

Last updated in NPPES Sep 4, 2008

Taxonomy & licenses

104100000X Social Worker Behavioral Health & Social Service Providers · License 44SL05492500 (NJ) Primary

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

Is NPI 1255589115 active?

Yes, as of the latest NPPES snapshot, NPI 1255589115 is active (record last updated 2008-09-04).

How do I verify Deanne Mastrangelo's NPI record?

Cross-check NPI 1255589115 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 2008-09-04.