Nicole Twaalfhoven, LCPC
Nicole Twaalfhoven, LCPC is a Mental Health Counselor in Riverdale, MD, registered under NPI 1003325515. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
Here is what surrounds this office in Riverdale, based on OpenStreetMap data collected Sep 18, 2026. Parking is available about 0.51 mi away. There is EV charging 0.49 mi from the office (Tesla Supercharger) — useful if you are driving in from out of town. The nearest transit stop is 210 ft away, served by Queensbury Rd at Baltimore Ave. A pharmacy sits 360 ft from the entrance (Walgreens), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.45 mi away.
Getting here and what is nearby
Transit Baltimore Ave at Queensbury Rd 107 ft ~1 min
Parking 127 ft ~1 min
Transit Queensbury Rd at Baltimore Av 161 ft ~1 min
Parking 163 ft ~1 min
Transit Queensbury Rd at Baltimore Ave 210 ft ~1 min
Restaurant McDonald's 272 ft ~2 min
6228 Baltimore Boulevard, Riverdale 20737
Mo-Th 05:00-24:00; Fr 05:00-04:00; Sa 00:00-24:00; Su 04:00-24:00
Gas station Exxon 326 ft ~2 min
6117 Baltimore Avenue, Riverdale 20737
Pharmacy Walgreens 360 ft ~2 min
6130 Baltimore Avenue, Riverdale 20737
Restaurant El Comalito Authentic Pupuseria 631 ft ~3 min
6100 Baltimore Avenue, 20737
Convenience 7-Eleven 799 ft ~4 min
Restaurant Shagga Ethiopian Cuisine 797 ft ~4 min
Gas station Baltimore Ave Valero 961 ft ~4 min
Convenience 7-Eleven 0.20 mi ~5 min
Coffee Manifest Bread 0.22 mi ~5 min
6208 Rhode Island Avenue, Riverdale Park 20737
Convenience Ceci's Tienda Latina Grocery Store 0.23 mi ~5 min
6216 Rhode Island Avenue
Grocery Whole Foods Market 0.41 mi ~9 min
6621 Baltimore Avenue, Riverdale 20737
Mo-Su 07:00-22:00
EV charging 0.43 mi ~9 min
Coffee Starbucks 0.45 mi ~9 min
4501 Van Buren Street, Riverdale Park 20737
06:00-20:00
EV charging 0.48 mi ~10 min
EV charging Tesla Supercharger 0.49 mi ~10 min
Parking 0.51 mi ~11 min
4600 Van Buren Street, Riverdale 20737
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 |
|---|---|---|
| LPC8520 | MD | Mental Health Counselor primary |
This provider holds licence LPC8520 issued in MD. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Mental Health Counselor
- PAC ID
- 6800294489
- Enrollment ID
- I20250714002054
Medicare enrolment is recorded as approved under the provider type Practitioner - Mental Health Counselor. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Mental Health covers
Definition to come... NUCC Health Care Provider Taxonomy, code 101YM0800X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 101YM0800X | Mental Health Counselor Mental Health | LPC8520 | MD | primary |
| 101YP2500X | Professional Counselor Professional | — | — |
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 | 1003325515 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 27, 2017 |
| Last updated | Nov 15, 2024 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | LCPC |
| Practice address |
6200 BALTIMORE AVE STE 300 Riverdale, MD 20737 (301) 500-0311 |
| Mailing address |
3538 18TH ST S Arlington, VA 22204 |
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 | 2 | 5 | 5 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 2 | 1 | 5 | 2 |
Sum = 45 · next multiple of 10 = 50 · 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.