Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mary Youssef- Isaac, DDS

General Practice Dentistry in Woodlyn, PA · enumerated 2019 · practices at Woodlyn Dentistry Group LLC.

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

National Provider Identifier

1326604489

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Registry record

Entity type Individual (Type 1)

Name Mary Youssef- Isaac

Credential DDS

Sex Female

Practice address 550 Fairview Rd, Woodlyn, PA, 19094

Phone (610) 833-2660

Enumeration date May 14, 2019

Last updated in NPPES Feb 8, 2022

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License D14177 (MN) Secondary

1223G0001X General Practice Dentistry Dental Providers · License DS042633 (PA) Primary

DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS 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

Where does Mary Youssef- Isaac practice?

The practice location on file with NPPES is in Woodlyn, PA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Mary Youssef- Isaac?

The National Provider Identifier (NPI) for Mary Youssef- Isaac is 1326604489, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Woodlyn Dentistry Group LLC Dentist · Woodlyn, PA NPI 1356805337

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-02-08.