Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alexandra R. Seigies

Psychologist in Cambridge, MA · enumerated 2023.

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

National Provider Identifier

1801590294

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Registry record

Entity type Individual (Type 1)

Name Alexandra R. Seigies

Sex Female

Practice address 1493 Cambridge St Rm 239, Cambridge, MA, 02139

Phone (617) 575-5399

Enumeration date Mar 29, 2023

Last updated in NPPES Mar 29, 2023

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers Primary

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 Alexandra Seigies?

The National Provider Identifier (NPI) for Alexandra Seigies is 1801590294, a Type 1 (individual) record in the CMS NPPES registry.

Where does Alexandra Seigies practice?

The practice location on file with NPPES is in Cambridge, MA. 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 2023-03-29.