NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. David Lloyd Marcus, PH.D. LCSW

Clinical Social Worker in New York, NY · enumerated 2006 · practices at Duane Reade.

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

National Provider Identifier

1972582583

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Registry record

Entity type Individual (Type 1)
Name Dr. David Lloyd Marcus
Credential PH.D. LCSW
Sex Male
Practice address New York, NY, 10044
Phone (212) 777-8222
Fax (212) 263-6271
Enumeration date Jan 12, 2006
Last updated in NPPES May 27, 2008

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 071570 (NY) Primary

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

Is NPI 1972582583 active?
Yes, as of the latest NPPES snapshot, NPI 1972582583 is active (record last updated 2008-05-27).
How do I verify David Marcus's NPI record?
Cross-check NPI 1972582583 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 2008-05-27.