Diana Castellon, LMSW
Diana Castellon, LMSW is a provider specialising in Social Worker in Olney, MD, registered under NPI 1003585944.
Getting there
Here is what surrounds this office in Olney, based on OpenStreetMap data collected Sep 23, 2026. Parking is available about 207 ft away. There is EV charging 0.21 mi from the office (eVgo) — useful if you are driving in from out of town. The nearest transit stop is 733 ft away, served by Georgia Av at Queen Mary Dr. A pharmacy sits 0.29 mi from the entrance (Tru Health Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 1,010 ft away.
Getting here and what is nearby
Gas station BP 120 ft ~1 min
17901 Georgia Avenue, Olney 20832
Transit Georgia Av at Spartan Rd 140 ft ~1 min
Parking 159 ft ~1 min
Restaurant Dunkin' 171 ft ~1 min
17920 Georgia Avenue, Olney 20832
Mo-Sa 04:00-21:00; Su 05:00-21:00
Gas station Fletcher's 192 ft ~1 min
Parking 196 ft ~1 min
Parking 207 ft ~1 min
Restaurant Shang Hai 268 ft ~2 min
3409 Morningwood Drive
Restaurant McDonald's 428 ft ~2 min
Convenience Shell 539 ft ~3 min
18040 Georgia Avenue, Olney 20832
Gas station Shell 547 ft ~3 min
18040 Georgia Avenue, Olney 20832
Grocery Safeway 570 ft ~3 min
3333 Spartan Road, Olney 20832
Mo-Su 06:00-23:00
Transit Georgia Av at Olney Sandy Spring Rd 677 ft ~3 min
Transit Georgia Av at Queen Mary Dr 733 ft ~3 min
Coffee Starbucks 714 ft ~3 min
Pharmacy Walgreens 947 ft ~4 min
3446 Olney Laytonsville Road, Olney 20832
Mo-Su 08:00-22:00
Coffee Tous les Jours 1,010 ft ~4 min
EV charging eVgo 0.21 mi ~5 min
Convenience Sunoco 0.21 mi ~5 min
Grocery Giant 0.21 mi ~5 min
18140 Village Center, Olney 20832
Mo-Su 06:00-23:00
Convenience 7-Eleven 0.25 mi ~6 min
Pharmacy Tru Health Pharmacy 0.29 mi ~6 min
Grocery Harris Teeter 0.32 mi ~7 min
18169 Town Center Drive, Olney 20832
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 |
|---|---|---|
| 20544 | MD | Social Worker primary |
This provider holds licence 20544 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 Social Worker covers
A social worker is a person who is qualified by a Social Work degree, and licensed, certified or registered by the state as a social worker to practice within the scope of that license. A social worker provides assistance and counseling to clients and their families who are dealing with social, emotional and environmental problems. Social work services may be rendered to individuals, families, groups, and the public. NUCC Health Care Provider Taxonomy, code 104100000X
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 | 1003585944 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 13, 2021 |
| Last updated | Sep 13, 2021 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | LMSW |
| Practice address |
17904 GEORGIA AVE STE 200 Olney, MD 20832 (240) 304-3327 |
| Other names |
Diana Paulino Other Name |
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 | 5 | 8 | 5 | 9 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 1 | 8 | 1 | 9 | 8 |
Sum = 56 · next multiple of 10 = 60 · check digit = 4 · actual last digit = 4
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.