Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Gregory Brent Dennis, PHD
Psychologist in Boulder City, NV · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1972562221
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Registry record
Entity type Individual (Type 1)
Name Gregory Brent Dennis
Credential PHD
Sex Male
Practice address 1000 Nevada Hwy, Suite 106, Boulder City, NV, 89005
Phone (702) 293-5945
Fax (702) 293-5168
Enumeration date Mar 23, 2006
Last updated in NPPES Oct 23, 2007
Taxonomy & licenses
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.
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 Gregory Dennis?
Gregory Dennis 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.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-10-23.