Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Jennifer Anne Nielsen, PSYD

Psychologist in Darien, CT · enumerated 2017.

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

National Provider Identifier

1629587258

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Registry record

Entity type Individual (Type 1)

Name Dr. Jennifer Anne Nielsen

Credential PSYD

Sex Female

Practice address 77 Linden Ave, Darien, CT, 06820

Phone (203) 636-0122

Enumeration date Sep 26, 2017

Last updated in NPPES Jul 21, 2022

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 3664 (CT) Primary

PSYD · Doctor of Psychology: A clinical doctorate in psychology focused on professional practice. About the PSYD 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 Jennifer Nielsen?

The National Provider Identifier (NPI) for Jennifer Nielsen is 1629587258, a Type 1 (individual) record in the CMS NPPES registry.

Where does Jennifer Nielsen practice?

The practice location on file with NPPES is in Darien, CT. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-21.