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

Dr. Gregory Paul Hollis, PH.D.

Clinical Neuropsychologist in Saint Louis, MO · enumerated 2008 · practices at Connecticut Dental Professionals, P.C..

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

National Provider Identifier

1982855276

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Registry record

Entity type Individual (Type 1)

Name Dr. Gregory Paul Hollis

Credential PH.D.

Sex Male

Practice address Saint Louis, MO, 63141

Phone (800) 325-3982

Enumeration date Oct 5, 2008

Last updated in NPPES Oct 5, 2008

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 PSY001417 (GA) 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 is the NPI number for Gregory Hollis?

The National Provider Identifier (NPI) for Gregory Hollis is 1982855276, a Type 1 (individual) record in the CMS NPPES registry.

Where does Gregory Hollis practice?

The practice location on file with NPPES is in Saint Louis, MO. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-10-05.