NPI Portal NPI Lookup & Verification

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

Ms. Vivien K Zak, LCSW-R

Clinical Social Worker in Brooklyn, NY · enumerated 2005 · practices at Creative Therapies Inc..

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

National Provider Identifier

1871582510

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Registry record

Entity type Individual (Type 1)
Name Ms. Vivien K Zak
Credential LCSW-R
Sex Female
Practice address Brooklyn, NY, 11238
Phone (917) 804-0477
Fax (718) 766-9741
Enumeration date Oct 15, 2005
Last updated in NPPES Aug 3, 2022

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 R045147-1 (NY) Primary

Other identifiers

Identifier Type State Issuer
R-045147-1 Other NY 1041C0700X - SOCIAL WORKER - CLINICAL
11512946 Other NY CAQH PROVIDER 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.

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Frequently asked questions

What is the NPI number for Vivien K Zak?
The National Provider Identifier (NPI) for Vivien K Zak is 1871582510, a Type 1 (individual) record in the CMS NPPES registry.
Where does Vivien K Zak practice?
The practice location on file with NPPES is in Brooklyn, NY. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-08-03.