Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Jamie Marczewski, LCSW
Clinical Social Worker in Islip, NY · enumerated 2020.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1598362212
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Registry record
Entity type Individual (Type 1)
Name Jamie Marczewski
Credential LCSW
Sex Female
Practice address 96 Finch Ln Apt 2a, Islip, NY, 11751
Phone (516) 578-6143
Enumeration date Oct 6, 2020
Last updated in NPPES Oct 14, 2025
Taxonomy & licenses
1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 109942 (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.
Frequently asked questions
What specialty is Jamie Marczewski?
Jamie Marczewski is registered in NPPES with the primary taxonomy of Clinical Social Worker. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-10-14.