Marcella Sims, MSSW
Marcella Sims, MSSW is a provider specialising in Clinical Social Worker in Alexandria, VA, registered under NPI 1003300476. 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 Alexandria, based on OpenStreetMap data collected Sep 17, 2026. Parking is available about 0.38 mi away. The nearest transit stop is 419 ft away, served by N Washington St & Princess St. A pharmacy sits 0.32 mi from the entrance (CVS Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.32 mi away.
Getting here and what is nearby
Parking 60 ft ~1 min
Transit N Washington St at Oronoco St 147 ft ~1 min
Parking 180 ft ~1 min
Transit N Washington St at Pendleton St 349 ft ~2 min
Transit N Washington St & Princess St 419 ft ~2 min
Grocery Trader Joe's 630 ft ~3 min
612 North Saint Asaph Street, Alexandria 22314
Mo-Su 08:00-21:00
Restaurant Zento Japanese Restaurant 729 ft ~3 min
693 North Washington Street, Alexandria 22314-1913
Mo-Fr 11:30-15:00,17:00-24:00; Sa,Su 12:00-24:00
Gas station Exxon 913 ft ~4 min
703 North Washington Street, Alexandria 22314
Mo-Su 07:00-21:00
Gas station Liberty 0.20 mi ~5 min
725 North Washington Street, Alexandria 22314
Restaurant Royal Restaurant 0.23 mi ~5 min
734 North Saint Asaph Street, Alexandria 22314
Restaurant Shanghai Peking 0.23 mi ~5 min
Grocery Harris Teeter 0.23 mi ~5 min
735 North Saint Asaph Street, Alexandria 22314
24/7
Coffee Starbucks 0.24 mi ~5 min
Gas station Shell 0.24 mi ~5 min
442 North Henry Street, Alexandria 22314
Mo-Sa 06:00-22:00; Su 07:00-21:00
Hotel Sheraton Suites Alexandria Old Town 0.27 mi ~6 min
801 North Saint Asaph Street, Alexandria 22314
Coffee LaPluma Coffee and Wine 0.31 mi ~7 min
Coffee Lily's Chocolate & Coffee 0.32 mi ~7 min
Pharmacy CVS Pharmacy 0.32 mi ~7 min
Convenience Ten Thousand Villages 0.34 mi ~7 min
Parking 0.38 mi ~8 min
114 South Washington Street, Alexandria 22314
Hotel Morrison House Old Town Alexandria, Autograph Collection 0.39 mi ~8 min
Hotel Hotel Heron 0.39 mi ~8 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
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 | 1003300476 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 19, 2018 |
| Last updated | Jun 19, 2018 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Credential | MSSW |
| Practice address |
500 N WASHINGTON ST Alexandria, VA 22314 (571) 969-0200 |
| Mailing address |
1910 WINDMILL LN Alexandria, VA 22307 |
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 | 3 | 0 | 0 | 4 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 0 | 0 | 4 | 5 |
Sum = 44 · next multiple of 10 = 50 · check digit = 6 · actual last digit = 6
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.