Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Joseph A Whitehorn, PHD

Psychologist in Charlestown, MA · enumerated 2005.

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

National Provider Identifier

1518958263

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Registry record

Entity type Individual (Type 1)

Name Dr. Joseph A Whitehorn

Credential PHD

Sex Male

Practice address 73 High St, Charlestown Health Care Center Ctn, Charlestown, MA, 02129

Phone (617) 724-8200

Fax (617) 726-3514

Enumeration date Nov 2, 2005

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 2587 (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

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.

What specialty is Joseph Whitehorn?

Joseph Whitehorn 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.