Karolina Walasek, FNP
Karolina Walasek, FNP is a Primary Care Nurse Practitioner in Brooklyn, NY, registered under NPI 1003430463. 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 Brooklyn, based on OpenStreetMap data collected Sep 12, 2026. Parking is available about 558 ft away. The nearest transit stop is 515 ft away, served by 1st Avenue & 56th Street. A pharmacy sits 0.37 mi from the entrance (Hi-Tech Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.40 mi away.
Getting here and what is nearby
Parking 196 ft ~1 min
Parking Hospital Parking 298 ft ~2 min
Transit 2nd Avenue & 56th Street 350 ft ~2 min
Transit 55th Street & 2nd Avenue 386 ft ~2 min
Convenience Omega Deli 423 ft ~2 min
Convenience King Deli & Grill 430 ft ~2 min
Pharmacy Lutheran Pharmacy 458 ft ~2 min
2nd Avenue, Brooklyn 11220
Mo-Fr 09:00-18:00; Sa 10:00-16:00
Restaurant Subway 451 ft ~2 min
5407 2nd Avenue, Brooklyn 11220
Mo-Fr 07:30-22:00; Sa-Su 08:00-22:00
Transit 1st Avenue & 56th Street 515 ft ~2 min
Restaurant Dunkin' Donuts/Baskin Robbins 538 ft ~3 min
Parking 558 ft ~3 min
Restaurant Pier 53 Sandwich Shop 584 ft ~3 min
Gas station Emporium 1 637 ft ~3 min
5701 2nd Avenue, 11220
Convenience Kaj Food Mart 663 ft ~3 min
Coffee Pete's Brooklyn Eats Cafe 0.21 mi ~5 min
140 58th Street, 11220
Pharmacy Mega Aid 0.35 mi ~8 min
Pharmacy Hi-Tech Pharmacy 0.37 mi ~8 min
Grocery Bravo 0.38 mi ~8 min
Coffee Metro Bagel & Cafe 0.40 mi ~9 min
Gas station Sunoco 0.45 mi ~9 min
Grocery Bravo 0.48 mi ~10 min
4808 4th Avenue, Brooklyn 11220
Mo-Sa 07:30-21:00; Su 08:00-21:00
Grocery Pioneer Supermarket 0.49 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 |
|---|---|---|
| 343642 | NY | Primary Care Nurse Practitioner primary |
This provider holds licence 343642 issued in NY. 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
- Order And Referring Only - Nurse Practitioner
- PAC ID
- 1456713577
- Enrollment ID
- I20230821003380
Medicare enrolment is recorded as approved under the provider type Order And Referring Only - Nurse Practitioner. 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 Primary Care covers
Definition to come... NUCC Health Care Provider Taxonomy, code 363LP2300X
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 | 1003430463 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 2, 2020 |
| Last updated | Jun 2, 2020 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Credential | FNP |
| Practice address |
150 55TH ST Brooklyn, NY 11220 (718) 630-7525 |
| Mailing address |
10031 4TH AVE Brooklyn, NY 11209 |
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 | 4 | 3 | 0 | 4 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 8 | 3 | 0 | 4 | 3 |
Sum = 47 · next multiple of 10 = 50 · check digit = 3 · actual last digit = 3
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.