NPI Portal NPI Lookup & Verification

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

Dr. Martin Harold Klein, PH.D.

Clinical Psychologist in Westport, CT · enumerated 2006.

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

National Provider Identifier

1902820871

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Registry record

Entity type Individual (Type 1)
Name Dr. Martin Harold Klein
Credential PH.D.
Sex Male
Practice address Westport, CT, 06880
Phone (203) 915-0601
Fax (203) 292-9845
Enumeration date Jul 26, 2006
Last updated in NPPES Jan 8, 2019

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 001909 (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

Is NPI 1902820871 active?
Yes, as of the latest NPPES snapshot, NPI 1902820871 is active (record last updated 2019-01-08).
How do I verify Martin Klein's NPI record?
Cross-check NPI 1902820871 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-01-08.