Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. G. Grant Holtzberg, PH.D.

Psychologist in West Hartford, CT · enumerated 2006.

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

National Provider Identifier

1710900741

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Registry record

Entity type Individual (Type 1)

Name Dr. G. Grant Holtzberg

Credential PH.D.

Sex Male

Practice address 345 N Main St, Suite 302, West Hartford, CT, 06117

Phone (860) 233-9772

Fax (860) 236-9402

Enumeration date Jul 25, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 1538 (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

Where does G. Grant Holtzberg practice?

The practice location on file with NPPES is in West Hartford, CT. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for G. Grant Holtzberg?

The National Provider Identifier (NPI) for G. Grant Holtzberg is 1710900741, a Type 1 (individual) record in the CMS NPPES registry.

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