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

Dr. Olivia Mandelbaum, Ph.D.

Psychologist in Norwalk, CT · enumerated 2019.

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

National Provider Identifier

1336794486

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Registry record

Entity type Individual (Type 1)
Name Dr. Olivia Mandelbaum
Credential Ph.D.
Sex Female
Practice address Norwalk, CT, 06851
Phone (914) 424-0909
Enumeration date Aug 6, 2019
Last updated in NPPES Sep 21, 2026

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

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 023312 (NY) Secondary
103T00000X Psychologist Behavioral Health & Social Service Providers · License 3999 (CT) Primary
PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD 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.

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Frequently asked questions

What is the NPI number for Olivia Mandelbaum?
The National Provider Identifier (NPI) for Olivia Mandelbaum is 1336794486, a Type 1 (individual) record in the CMS NPPES registry.
Where does Olivia Mandelbaum practice?
The practice location on file with NPPES is in Norwalk, CT. 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 2026-09-21.