Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mr. David Paul Isenberg, PHD
Psychologist in Fairfield, CT · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1679664825
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Registry record
Entity type Individual (Type 1)
Name Mr. David Paul Isenberg
Credential PHD
Sex Male
Practice address 400 Stillson Road, Fairfield, CT, 06824
Phone (203) 335-7000
Fax (203) 254-3122
Enumeration date Sep 27, 2006
Last updated in NPPES Jul 8, 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
Where does David Isenberg practice?
The practice location on file with NPPES is in Fairfield, CT. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for David Isenberg?
The National Provider Identifier (NPI) for David Isenberg is 1679664825, a Type 1 (individual) record in the CMS NPPES registry.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.