Gregory J. Duffner, D.D.S.
NPI 1225340375ActiveIndividual· Dentist, General Practice· Homewood, IL
Dentist, General Practice (D.D.S.) in Homewood, Illinois, licensed in IL, with an NPI issued in July 2010. Part D covered 23 prescriptions written in 2024, 87% of them generic. Keystone Dental Inc. was the largest of 4 companies reporting payments in 2025, $365.93 in all, mostly food and beverage.
Overview
| NPI | 1225340375 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.D.S. |
| Sole proprietor | No |
| NPI issued | Jul 6, 2010 |
| Last updated in NPPES | Oct 23, 2025 |
| Certified by provider | Oct 23, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Dentist, General Practice Primary | 1223G0001X | 019-019782 | IL |
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) | Not in the public enrollment file of Oct 1, 2026 |
|---|
Part D prescriptions in 2024
| Prescriptions (claims) | 23 · 29 30-day fills |
|---|---|
| Patients | 15 |
| Total drug cost | $311.52 |
| Generic share | 87% of claims |
Industry payments (Open Payments)
- 2025$365.93 · 6 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Keystone Dental Inc. | $248.77 | 2 |
| Align Technology, Inc. | $56.33 | 2 |
| Straumann USA LLC | $40.00 | 1 |
| Solventum Corporation | $20.83 | 1 |
What the 2025 payments were for
- Food and Beverage$365.93 · 6 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 25 general dentists in Homewood · All general dentists in Illinois