Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Leonard Silverstein, M.D.

Specialist in Saddle River, NJ · enumerated 2006.

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

National Provider Identifier

1639138571

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Registry record

Entity type Individual (Type 1)

Name Dr. Leonard Silverstein

Credential M.D.

Sex Male

Practice address 82 E Allendale Rd, Suite 7a and 7b, Saddle River, NJ, 07458

Phone (201) 236-8282

Fax (201) 236-0138

Enumeration date Mar 20, 2006

Last updated in NPPES Sep 5, 2012

Taxonomy & licenses

174400000X Specialist Other Service Providers · License MA57113 (NJ) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
089914	Other	NJ	MEDICARE GROUP ID

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

Is NPI 1639138571 active?

Yes, as of the latest NPPES snapshot, NPI 1639138571 is active (record last updated 2012-09-05).

How do I verify Leonard Silverstein's NPI record?

Cross-check NPI 1639138571 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 2012-09-05.