Sydni Mcmillan, LMSW
Sydni Mcmillan, LMSW is a provider specialising in Clinical Social Worker in Columbia, MD, registered under NPI 1003624206. 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 Columbia, based on OpenStreetMap data collected Sep 16, 2026. Parking is available about 0.34 mi away. There is EV charging 0.44 mi from the office — useful if you are driving in from out of town. The nearest transit stop is 0.22 mi away. A pharmacy sits 0.47 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 160 ft ~1 min
Transit 250 ft ~1 min
Gas station Exxon 318 ft ~2 min
Gas station Exxon 366 ft ~2 min
Transit 829 ft ~4 min
Restaurant Hangry Joe's Hot Chicken & Wings 995 ft ~4 min
10730 Little Patuxent Parkway, Columbia 21044
Convenience 7-Eleven 0.21 mi ~5 min
Transit 0.22 mi ~5 min
EV charging 0.27 mi ~6 min
Restaurant Po Boy Jim Bar and Grill 0.30 mi ~6 min
Restaurant MOD Pizza 0.30 mi ~6 min
10000 Town Center Avenue, Columbia 21044
Su-Th 10:30-22:00; Fr-Sa 10:30-23:00
Coffee Kung Fu Tea 0.32 mi ~7 min
10100 Twin Rivers Road, Columbia 21044
Su-Th 11:00-22:00; Fr-Sa 11:00-23:00
Parking 0.34 mi ~7 min
10540 Little Patuxent Parkway, Columbia 21044
Parking 0.34 mi ~7 min
10970 Grantchester Way, Columbia 21044
EV charging 0.40 mi ~9 min
EV charging 0.44 mi ~9 min
Grocery Lidl 0.44 mi ~9 min
10300 Little Patuxent Parkway, Columbia 21044
Mo-Su 08:00-21:00
Pharmacy CVS Pharmacy 0.47 mi ~10 min
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 |
|---|---|---|
| 32569 | MD | Clinical Social Worker primary |
This provider holds licence 32569 issued in MD. 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 | 1003624206 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Dec 20, 2024 |
| Last updated | Dec 20, 2024 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Credential | LMSW |
| Practice address |
10630 LITTLE PATUXENT PKWY STE AND209A Columbia, MD 21044 (410) 740-8066 |
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 | 6 | 2 | 4 | 2 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 3 | 2 | 8 | 2 | 0 |
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.