Diana Diaz, LCSW
Diana Diaz, LCSW is a provider specialising in Clinical Social Worker in Fairfax, VA, registered under NPI 1003087925. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Fairfax, based on OpenStreetMap data collected Sep 4, 2026. Parking is available about 0.35 mi away at WMATA Dunn Loring - Merrifield Garage. There is EV charging 0.43 mi from the office — useful if you are driving in from out of town. The nearest transit stop is 0.36 mi away, served by Merrilee Dr at #2809. If you arrive early, there is a coffee shop 0.43 mi away.
Getting here and what is nearby
Parking 143 ft ~1 min
Parking 287 ft ~2 min
Restaurant District Taco 0.27 mi ~6 min
Restaurant Japomen 0.29 mi ~6 min
2676 Avenir Place, Vienna 22180
Tu-Th 11:00-15:00,16:30-21:00; Fr 11:00-15:00,16:30-22:00; Sa 11:00-22:00; Su 11:00-21:00
Transit Merrilee Dr at Halsted Square Rd 0.30 mi ~6 min
Transit Merrilee Dr at Prosperity Av 0.30 mi ~7 min
Coffee Shaghf Cafe 0.30 mi ~7 min
Restaurant Viet Corner 0.30 mi ~6 min
Coffee Damn Loading Zone 0.33 mi ~7 min
Merrilee Drive, Fairfax 22031
Parking WMATA Dunn Loring - Merrifield Garage 0.35 mi ~8 min
2676 Avenir Place, Fairfax 22180
Transit Merrilee Dr at #2809 0.36 mi ~8 min
Gas station BP 0.40 mi ~8 min
8318 Route 29, Fairfax 22031
Convenience The Bodega Neighborhood Market 0.41 mi ~9 min
2730 Gallows Road, Vienna 22180
Mo-Sa 08:00-23:00, Su 08:00-22:00
Coffee Starbucks 0.43 mi ~9 min
EV charging 0.43 mi ~9 min
Gas station Merrifield Shell 0.43 mi ~9 min
8413 Route 29, Merrifield 22031
Hotel Courtyard Dunn Loring Fairfax 0.43 mi ~9 min
Grocery Harris Teeter 0.43 mi ~9 min
2671 Avenir Place, Vienna 22180
Mo-Su 06:00-23:00
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 0904009051 | VA | Clinical Social Worker primary |
This provider holds licence 0904009051 issued in VA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Clinical covers
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances. NUCC Health Care Provider Taxonomy, code 1041C0700X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1003087925 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 19, 2008 |
| Last updated | Jan 26, 2016 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Credential | LCSW |
| Practice address |
2740 PROSPERITY AVE STE 200 Fairfax, VA 22031 (703) 321-2687 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 0 | 8 | 7 | 9 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 8 | 5 | 9 | 4 |
Sum = 55 · next multiple of 10 = 60 · check digit = 5 · actual last digit = 5
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.