Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Joseph Portnoy, DDS

General Practice Dentistry in Lindenhurst, NY · enumerated 2006 · practices at Marc N. Sperber, DDS & Joseph Portnoy, DDS, LLC.

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

National Provider Identifier

1225103526

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Registry record

Entity type Individual (Type 1)

Name Dr. Joseph Portnoy

Credential DDS

Sex Male

Practice address 266 East Sunrise Highway, Lindenhurst, NY, 11757

Phone (631) 226-5252

Fax (631) 226-5293

Enumeration date Nov 21, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License 0438361 (NY) 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.

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Frequently asked questions

How do I verify Joseph Portnoy's NPI record?

Cross-check NPI 1225103526 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1225103526 active?

Yes, as of the latest NPPES snapshot, NPI 1225103526 is active (record last updated 2007-07-08).

Other providers at this practice address

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Marc N. Sperber, DDS & Joseph Portnoy, DDS, LLC General Practice Dentistry · Lindenhurst, NY NPI 1861567166 Marc Sperber General Practice Dentistry · Lindenhurst, NY NPI 1760557060

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