Heidi Sadowsky, RN
Heidi Sadowsky, RN is an Oncology Registered Nurse in New York, NY, registered under NPI 1003766759.
Getting there
Here is what surrounds this office in New York, based on OpenStreetMap data collected Sep 8, 2026. Parking is available about 900 ft away at Centerpark East 66th Street Parking Garage. There is EV charging 0.49 mi from the office (ChargePoint) — useful if you are driving in from out of town. The nearest transit stop is 494 ft away, served by 2 Av/E 64 St. A pharmacy sits 661 ft from the entrance (Vitahealth Apothecary), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 667 ft away.
Getting here and what is nearby
Transit 2nd Avenue & East 66th Street 141 ft ~1 min
Restaurant Two Boots Pizza 184 ft ~1 min
1243 2nd Avenue, New York 10065
Mo-Th 11:30-20:30; Fr 11:30-21:30; Sa 12:00-21:30; Su 12:00-20:30
Restaurant Silver Star 199 ft ~1 min
Convenience 7-Eleven 251 ft ~1 min
Transit East 67th Street & 2nd Avenue 458 ft ~2 min
Transit 2 Av/E 64 St 494 ft ~2 min
Coffee Java Girl 477 ft ~2 min
348 East 66th Street, 10065
Mo-Fr 06:30-19:00; Sa,Su 08:30-16:00
Restaurant Sushi Yoshizawa 515 ft ~2 min
354 East 66th Street
Convenience The Deli Deli 598 ft ~3 min
1219 1st Avenue, 10065
Hotel The Gardens Sonesta ES Suites 578 ft ~3 min
Parking 557 ft ~3 min
337 East 64th Street, New York 10065
Pharmacy Cedra Pharmacy 598 ft ~3 min
Grocery Health Nuts Store 576 ft ~3 min
Coffee B&B Bagels 642 ft ~3 min
1201 2nd Avenue, 10065
Pharmacy Cherry's Pharmacy 646 ft ~3 min
Coffee Madame Bonte Cafe 667 ft ~3 min
205 East 66th Street, 10065
Pharmacy Vitahealth Apothecary 661 ft ~3 min
1235 1st Avenue
Grocery Gristedes 721 ft ~3 min
Convenience Fresh Food Farm 863 ft ~4 min
Parking 861 ft ~4 min
403 East 65th Street, New York 10065
Parking Centerpark East 66th Street Parking Garage 900 ft ~4 min
168 East 66th Street, New York 10065
Mo-Su 06:00-00:00
Grocery Ouri's Market 1,023 ft ~4 min
Hotel Plaza Athénée 0.40 mi ~9 min
37 East 64th Street, 10065
Hotel Ronald McDonald House New York 0.42 mi ~9 min
405 East 73rd Street
EV charging ChargePoint 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 |
|---|---|---|
| 603858 | NY | Oncology Registered Nurse primary |
This provider holds licence 603858 issued in NY. 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 Oncology covers
Definition to come... NUCC Health Care Provider Taxonomy, code 163WX0200X
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 | 1003766759 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Feb 2, 2026 |
| Last updated | Feb 2, 2026 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | RN |
| Practice address |
300 E 66TH ST New York, NY 10065 (646) 888-4891 Fax (646) 888-4917 |
| Mailing address |
230 E 71ST ST APT 5E New York, NY 10021 |
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 | 7 | 6 | 6 | 7 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 5 | 6 | 3 | 7 | 1 |
Sum = 51 · next multiple of 10 = 60 · check digit = 9 · actual last digit = 9
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.