Gregory R. D'Onofrio, M.D.
NPI 1255304796ActiveIndividual· Internal Medicine, Cardiovascular Disease· Stamford, CT
Internal Medicine, Cardiovascular Disease (M.D.) in Stamford, Connecticut, trained at George Washington University School of Medicine (class of 1967). Their prescriptions cost Medicare Part D more than their services did: $452,568 for 2,288 claims, against $49,072 paid for services in 2024. E.R. Squibb & Sons, L.L.C. was the largest of 2 companies reporting payments in 2025, $58.29 in all, mostly food and beverage.
Overview
| NPI | 1255304796 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Feb 7, 2006 |
| Last updated in NPPES | Sep 7, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Cardiovascular Disease Primary | 207RC0000X | 149608 | CT |
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 - Cardiovascular Disease (Cardiology) (CT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 231 |
|---|---|
| Services billed | 856 across 17 procedure codes |
| Paid by Medicare | $49,072 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,288 · 5,950 30-day fills |
|---|---|
| Patients | 296 |
| Total drug cost | $452,568 |
| Generic share | 86% of claims |
Education and affiliations
| Medical school | George Washington University School of Medicine |
|---|---|
| Graduation year | 1967 |
| Medicare specialty | Cardiovascular Disease (Cardiology) |
Medical group
- Stamford Health Medical Group IncStamford, CT · 444 clinicians
Hospital affiliation
- Stamford HospitalStamford, CT
Industry payments (Open Payments)
- 2025$58.29 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| E.R. Squibb & Sons, L.L.C. | $31.14 | 1 |
| Kerecis Limited | $27.15 | 1 |
What the 2025 payments were for
- Food and Beverage$58.29 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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