Kristina T. Grehan
NPI 1992138218ActiveIndividual· Nurse Practitioner, Family· Syosset, NY
Nurse Practitioner, Family with North Shore Hematology Oncology Associates PC, practicing in Syosset, New York. Their prescriptions cost Medicare Part D more than their services did: $16,413 for 173 claims, against $1,003 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 4 companies reporting payments in 2025, $310.48 in all, mostly food and beverage.
Overview
| NPI | 1992138218 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Sole proprietor | Yes |
| NPI issued | Aug 11, 2013 |
| Last updated in NPPES | Aug 11, 2013 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Family Primary | 363LF0000X | F338161-1 | NY |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nurse Practitioner (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 12 |
|---|---|
| Services billed | 15 across 4 procedure codes |
| Paid by Medicare | $1,003 |
Part D prescriptions in 2024
| Prescriptions (claims) | 173 · 256 30-day fills |
|---|---|
| Patients | 64 |
| Total drug cost | $16,413 |
| Generic share | 82% of claims |
Education and affiliations
| Graduation year | 2013 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical group
- North Shore Hematology Oncology Associates PCPort Jefferson Station, NY · 479 clinicians
Industry payments (Open Payments)
- 2025$310.48 · 4 payments from 4 companies
- 2024$84.79 · 4 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $125.00 | 1 |
| Genzyme Corporation | $102.50 | 1 |
| Puma Biotechnology, Inc. | $61.01 | 1 |
| Zoll Services LLC (A/K/A Zoll Lifecor Corp) | $21.97 | 1 |
What the 2025 payments were for
- Food and Beverage$310.48 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 28 family nurse practitioners in Syosset · All family nurse practitioners in New York