NPI Portal NPI Lookup & Verification

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

Ms. Donna Gerard Marder, LCSW

Clinical Social Worker in Croton on Hudson, NY · enumerated 2008 · practices at Donna Gerard Marder L.C.S.W., P.C..

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

National Provider Identifier

1083867576

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Ms. Donna Gerard Marder
Credential LCSW
Sex Female
Practice address Croton on Hudson, NY, 10520
Phone (914) 271-4514
Fax (413) 337-4307
Enumeration date Oct 28, 2008
Last updated in NPPES Oct 28, 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 LCSWPR008633 (NY) Primary
LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Donna Marder?
The National Provider Identifier (NPI) for Donna Marder is 1083867576, a Type 1 (individual) record in the CMS NPPES registry.
Where does Donna Marder practice?
The practice location on file with NPPES is in Croton on Hudson, NY. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-10-28.