Anastasia Elizabeth Grebeck, PA-C
NPI 1972081164ActiveIndividual· Physician Assistant· Fairfax, VA
Physician Assistant (PA-C) with Regional Gastroenterology Associates of Lancaster, Ltd., practicing in Fairfax, Virginia. 325 Medicare patients in 2024, $30,634 paid; nearly all of their 286 Part D prescriptions were generic (90%). Abbvie Inc. was the largest of 22 companies reporting payments in 2025, $2,030 in all, mostly food and beverage. Lists Bryn Mawr Hospital and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1972081164 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA-C |
| Sole proprietor | No |
| NPI issued | Jul 31, 2018 |
| Last updated in NPPES | Mar 8, 2021 |
| Certified by provider | Mar 8, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | 0110006276 | VA |
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 - Physician Assistant (DC); Practitioner - Physician Assistant (PA); Practitioner - Physician Assistant (VA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 325 |
|---|---|
| Services billed | 414 across 11 procedure codes |
| Paid by Medicare | $30,634 |
Part D prescriptions in 2024
| Prescriptions (claims) | 286 · 611 30-day fills |
|---|---|
| Patients | 123 |
| Total drug cost | $35,249 |
| Generic share | 90% of claims |
Education and affiliations
| Graduation year | 2018 |
|---|---|
| Medicare specialty | Physician Assistant |
Medical group
- Regional Gastroenterology Associates of Lancaster, Ltd.Lancaster, PA · 244 clinicians
Hospital affiliations
- Bryn Mawr HospitalBryn Mawr, PA
- Chester County HospitalWest Chester, PA
- Paoli HospitalPaoli, PA
- Riddle Memorial HospitalMedia, PA
Industry payments (Open Payments)
- 2025$2,030 · 104 payments from 22 companies
- 2024$1,820 · 85 payments from 16 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $348.60 | 23 |
| Janssen Biotech, Inc. | $309.25 | 12 |
| Ardelyx, Inc. | $185.68 | 9 |
| Madrigal Pharmaceuticals | $176.04 | 9 |
| Phathom Pharmaceuticals, Inc. | $153.19 | 10 |
What the 2025 payments were for
- Food and Beverage$2,030 · 104 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 158 physician assistants in Fairfax · All physician assistants in Virginia