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

Mr. Stephen Vincent Deddens, LCSW

Clinical Social Worker in Leesburg, VA · enumerated 2006.

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

National Provider Identifier

1124125786

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Registry record

Entity type Individual (Type 1)
Name Mr. Stephen Vincent Deddens
Credential LCSW
Sex Male
Practice address Leesburg, VA, 20175
Phone (703) 777-3485
Enumeration date Sep 17, 2006
Last updated in NPPES Jul 8, 2007

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 0904003653 (VA) Primary
LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW 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 Stephen Deddens?
The National Provider Identifier (NPI) for Stephen Deddens is 1124125786, a Type 1 (individual) record in the CMS NPPES registry.
Where does Stephen Deddens practice?
The practice location on file with NPPES is in Leesburg, VA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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