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

Dr. Deborah Matthews, PHD

Clinical Psychologist in Stamford, CT · enumerated 2012.

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

National Provider Identifier

1578838512

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Registry record

Entity type Individual (Type 1)

Name Dr. Deborah Matthews

Credential PHD

Sex Female

Practice address Stamford, CT, 06902

Phone (203) 904-4218

Enumeration date Mar 8, 2012

Last updated in NPPES Nov 9, 2021

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 022773 (NY) Secondary

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 002222 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Deborah Matthews?

Deborah Matthews is registered in NPPES with the primary taxonomy of Clinical 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.

Other providers at this practice address

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Eric Schleifer Clinical Child & Adolescent Psychologist · Stamford, CT NPI 1356631626 Anthony Phillips Clinical Social Worker · Stamford, CT NPI 1871855346

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-11-09.