Abby Hornstein, MD
NPI 1427048628ActiveIndividual· Pathology, Blood Banking & Transfusion Medicine· Gardner, MA
Pathology, Blood Banking & Transfusion Medicine (MD) in Gardner, Massachusetts, trained at Perelman School of Med at the University of Pennsylvania (class of 1990). Medicare paid $56,360 for services to 871 patients in 2024. Tempus Ai, Inc was the largest of 3 companies reporting payments in 2025, $55.13 in all, mostly food and beverage.
Overview
| NPI | 1427048628 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Oct 27, 2005 |
| Last updated in NPPES | May 5, 2026 |
| Certified by provider | May 5, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Pathology, Blood Banking & Transfusion Medicine Primary | 207ZB0001X | 80164 | MA |
| Pathology, Clinical Pathology/Laboratory Medicine | 207ZP0105X | 80164 | MA |
| Pathology, Anatomic Pathology & Clinical Pathology | 207ZP0102X | 80164 | MA |
| Pathology, Anatomic Pathology & Clinical Pathology | 207ZP0102X | MD08831 | RI |
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 - Pathology (MA); Practitioner - Pathology (RI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 871 |
|---|---|
| Services billed | 1,925 across 21 procedure codes |
| Paid by Medicare | $56,360 |
Education and affiliations
| Medical school | Perelman School of Med at the University of Pennsylvania |
|---|---|
| Graduation year | 1990 |
| Medicare specialty | Pathology |
Medical group
- University Pathologists, LLCWinchester, MA · 20 clinicians
Hospital affiliations
- Newport HospitalNewport, RI
- Our Lady of Fatima HospitalNorth Providence, RI
- Rhode Island HospitalProvidence, RI
- South County Hospital IncWakefield, RI
- The Miriam HospitalProvidence, RI
Industry payments (Open Payments)
- 2025$55.13 · 3 payments from 3 companies
- 2024$25.72 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Tempus Ai, Inc | $23.70 | 1 |
| Cepheid | $17.04 | 1 |
| Werfen USA LLC | $14.39 | 1 |
What the 2025 payments were for
- Food and Beverage$55.13 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records