Mary Ostaszewski, FNP-C
Mary Ostaszewski, FNP-C is a Family Nurse Practitioner in Sugar Hill, GA, registered under NPI 1003013236. 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 Sugar Hill, based on OpenStreetMap data collected Aug 29, 2026. Parking is available about 273 ft away.
Getting here and what is nearby
Parking 144 ft ~1 min
Parking 177 ft ~1 min
Parking 273 ft ~2 min
Gas station Chevron 938 ft ~4 min
4725 Buford Drive, Sugar Hill 30518
Restaurant Applebee's 0.25 mi ~5 min
Gas station Shell 0.34 mi ~7 min
1330 Peachtree Industrial Boulevard, Sugar Hill 30518
Convenience RaceTrac 0.41 mi ~9 min
Gas station RaceTrac 0.41 mi ~9 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 |
|---|---|---|
| RN144234 | GA | Registered Nurse |
| RN 144234 | GA | Family Nurse Practitioner primary |
This provider holds licence RN144234 issued in GA. 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 - Nurse Practitioner
- PAC ID
- 0042305245
- Enrollment ID
- I20071003000297
Medicare enrolment is recorded as approved under the provider type Practitioner - 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 Family covers
Definition to come... NUCC Health Care Provider Taxonomy, code 363LF0000X
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 | |
|---|---|---|---|---|
| 163W00000X | Registered Nurse | RN144234 | GA | |
| 363LF0000X | Family Nurse Practitioner Family | RN 144234 | GA | primary |
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 | 1003013236 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 29, 2007 |
| Last updated | Jan 9, 2026 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | FNP-C |
| Practice address |
4720 NELSON BROGDON BLVD Sugar Hill, GA 30518 (770) 945-1990 |
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 | 0 | 1 | 3 | 2 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 1 | 6 | 2 | 6 |
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.