Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Darren Christopher Brennan, PSYD
Clinical Psychologist in Reston, VA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1770666000
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Registry record
Entity type Individual (Type 1)
Name Dr. Darren Christopher Brennan
Credential PSYD
Sex Male
Practice address 1801 Robert Fulton Dr Ste 230, Reston, VA, 20191
Phone (703) 391-9410
Fax (703) 476-7634
Enumeration date Oct 23, 2006
Last updated in NPPES Nov 27, 2023
Taxonomy & licenses
103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 0810005104 (VA) Primary
PSYD · Doctor of Psychology: A clinical doctorate in psychology focused on professional practice.
About the PSYD 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
What is the NPI number for Darren Brennan?
The National Provider Identifier (NPI) for Darren Brennan is 1770666000, a Type 1 (individual) record in the CMS NPPES registry.
Where does Darren Brennan practice?
The practice location on file with NPPES is in Reston, VA. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-11-27.