Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Madeleine Marie Hardt, PHD

Psychologist in Stony Brook, NY · enumerated 2022.

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

National Provider Identifier

1598413056

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Registry record

Entity type Individual (Type 1)

Name Dr. Madeleine Marie Hardt

Credential PHD

Sex Female

Practice address 101 Nicolls Rd, Stony Brook, NY, 11794

Phone (631) 444-2990

Enumeration date Mar 14, 2022

Last updated in NPPES Aug 8, 2025

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 026958-01 (NY) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Madeleine Hardt?

Madeleine Hardt is registered in NPPES with the primary taxonomy of Psychologist. 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-08-08.