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

Floyd Wayne Mcmillan, PH.D

Clinical Neuropsychologist in Plano, TX · enumerated 2009.

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

National Provider Identifier

1023249380

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Registry record

Entity type Individual (Type 1)

Name Floyd Wayne Mcmillan

Credential PH.D

Sex Male

Practice address Plano, TX, 75093

Phone (972) 428-1652

Fax (972) 428-1606

Enumeration date Aug 5, 2009

Last updated in NPPES Aug 5, 2009

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

103G00000X Clinical Neuropsychologist Behavioral Health & Social Service Providers · License 21261 (TX) 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

What specialty is Floyd Mcmillan?

Floyd Mcmillan is registered in NPPES with the primary taxonomy of Clinical Neuropsychologist. 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-08-05.