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Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

DANIEL FASSIO PSY.D
NPI 1043117955
Psychologist - Clinical in Mc Lean, VA

Active since October 23, 2026
6845 ELM ST STE 507, MC LEAN, VA 22101(703) 215-4101 Get Directions Write a Review

NPPES record added: October 23, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Daniel Fassio Psy.d NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DANIEL FASSIO PSY.D (NPI 1043117955) is an individual clinical provider in Mc Lean, Virginia, licensed in Virginia (0810009569) and active in the NPI registry since October 2026.

NPPES Registry Identity

NPI1043117955
Entity TypeIndividualMale
Primary Taxonomy103TC0700X
Provider Legal NameDANIEL FASSIOCredential: PSY.D
Location Address6845 ELM ST STE 507Mc Lean, VA 22101-3859
Mailing Address13896 Ferrara CtChantilly, VA 20151-2322 · (202) 823-2603
Phone(703) 215-4101
Sole ProprietorYes
Enumeration DateOctober 23, 2026
NPPES CertifiedOctober 22, 2026
✔ NPI 1043117955 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologist · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code103TC0700X
License✔ Licensed in VA · 0810009569
Definition
A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems.
6845 ELM ST STE 507, Mc Lean, VA 22101
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Other Providers at the Same Location NPPES 5

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

BRANDY DINKLOCKER PSYD
Psychologist (Clinical)
6845 ELM ST STE 507
MC LEAN, VA 22101
Fairfax County (703) 288-3300
LEE WONG-HOLLAND, PSY.D., LLC
Psychologist (Clinical)
6845 ELM ST STE 507
MC LEAN, VA 22101
Fairfax County (703) 662-3095
INTEGRATED PSYCHOLOGY ASSOCIATES OF MCLEAN, LLC
Psychologist (Cognitive & Behavioral)
6845 ELM ST STE 507
MC LEAN, VA 22101
Fairfax County (703) 459-0417
DR. LORI BARFIELD PSYD
Psychologist
6845 ELM ST STE 507
MC LEAN, VA 22101
Fairfax County (703) 345-4015
VICKY TATIANA ARRIOLA LPC
Counselor (Professional)
6845 ELM ST STE 507
MC LEAN, VA 22101
Fairfax County (571) 207-6624

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Daniel Fassio's NPI number?

The NPI number for Daniel Fassio is 1043117955. It was assigned to this individual provider in the NPPES registry on October 23, 2026.

Where is Daniel Fassio located?

Daniel Fassio practices at 6845 Elm St Ste 507, Mc Lean, VA 22101. The listed phone number is (703) 215-4101.

What is Daniel Fassio's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.

When was this NPI record last updated?

The NPPES record for Daniel Fassio was last updated on October 23, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.