Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

William G. Leder, Dmd, LLC

General Practice Dentistry in South Plainfield, NJ · enumerated 2007 · authorized official William Leder, President-Dentist.

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

National Provider Identifier

1497960272

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Registry record

Entity type Organization (Type 2)

Legal business name William G. Leder, Dmd, LLC

Practice address 5001 Hadley Rd, South Plainfield, NJ, 07080

Phone (908) 561-3300

Fax (908) 561-1387

Enumeration date May 14, 2007

Last updated in NPPES Aug 22, 2020

Taxonomy & classification

1223G0001X General Practice Dentistry Dental Providers · License DI-17946 (NJ) Primary

Authorized official

Name William Leder

Title President-Dentist

Phone (908) 561-3300

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 is William G. Leder, Dmd, LLC located?

The practice location on file with NPPES is in South Plainfield, NJ.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2020-08-22. Verify at npiregistry.cms.hhs.gov.

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William Leder General Practice Dentistry · South Plainfield, NJ NPI 1790909299

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-22.