Gregory James Nielsen, D.D.S.
NPI 1578600318ActiveIndividual· Dentist, Endodontics· Billings, MT
Dentist, Endodontics (D.D.S.) in Billings, Montana, licensed in CO, MT and NV, with an NPI issued in January 2007. Part D covered 69 prescriptions written in 2024, 100% of them generic. Envista Holdings Corporation reported $100.00 in payments in 2025, mostly charitable contributions.
Overview
| NPI | 1578600318 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.D.S. |
| Sole proprietor | No |
| NPI issued | Jan 31, 2007 |
| Last updated in NPPES | Jul 21, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Dentist, Endodontics Primary | 1223E0200X | 8806 | CO |
| Dentist, Endodontics | 1223E0200X | 11499 | MT |
| Dentist, General Practice | 1223G0001X | 4702 | NV |
| Dentist, General Practice | 1223G0001X | 8806 | CO |
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) | 69 · 69 30-day fills |
|---|---|
| Patients | 41 |
| Total drug cost | $342.97 |
| Generic share | 100% of claims |
Industry payments (Open Payments)
- 2025$100.00 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Envista Holdings Corporation | $100.00 | 1 |
What the 2025 payments were for
- Charitable Contribution$100.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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