Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Charles J Slagen, PH.D.

Psychologist in Lexington, MA · enumerated 2006.

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

National Provider Identifier

1659343580

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Registry record

Entity type Individual (Type 1)

Name Dr. Charles J Slagen

Credential PH.D.

Sex Male

Practice address 16 Clarke St, Suite 21, Lexington, MA, 02421

Phone (781) 402-2442

Enumeration date Feb 4, 2006

Last updated in NPPES Jun 11, 2008

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 4833 (MA) 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

How do I verify Charles Slagen's NPI record?

Cross-check NPI 1659343580 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1659343580 active?

Yes, as of the latest NPPES snapshot, NPI 1659343580 is active (record last updated 2008-06-11).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-06-11.