Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Mary Elizabeth D Alonzo, SW

Social Worker in Philadelphia, PA · enumerated 2006.

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

National Provider Identifier

1407948359

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Registry record

Entity type Individual (Type 1)

Name Mrs. Mary Elizabeth D Alonzo

Credential SW

Sex Female

Practice address 8220 Castor Avenue, Philadelphia, PA, 19152

Phone (215) 728-4380

Fax (267) 350-4887

Enumeration date Sep 29, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

104100000X Social Worker Behavioral Health & Social Service Providers · License SW012009L (PA) 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 this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Mary D Alonzo?

Mary D Alonzo is registered in NPPES with the primary taxonomy of Social Worker. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.