Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark L. Greenberg, O.D.

Optometrist in Pearl River, NY · enumerated 2006.

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

National Provider Identifier

1124008586

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Registry record

Entity type Individual (Type 1)

Name Mark L. Greenberg

Credential O.D.

Sex Male

Practice address 275 N Middletown Rd, Suite 2b, Pearl River, NY, 10965

Phone (845) 735-5757

Enumeration date Jan 20, 2006

Last updated in NPPES Oct 27, 2008

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 3359 (NY) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

Other identifiers

Identifier	Type	State	Issuer
90603	Other	NY	AETNA
1C7777	Other	NY	HEALTHNET
P835132	Other	NY	OXFORD
C26312	Other	NY	BCBS

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 Mark Greenberg's NPI record?

Cross-check NPI 1124008586 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1124008586 active?

Yes, as of the latest NPPES snapshot, NPI 1124008586 is active (record last updated 2008-10-27).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-10-27.