Gregory Wayne Grzesik, D.O.
NPI 1316389372ActiveIndividual· Hospitalist· Weston, WI
Hospitalist (D.O.) in Weston, Wisconsin, trained at Lake Erie College of Osteopathic Medicine, Erie (class of 2013). In 2024 Medicare paid $13,759 for 75 patients, and Part D covered 430 of their prescriptions, 83% of them generic.
Overview
| NPI | 1316389372 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Jul 18, 2013 |
| Last updated in NPPES | Jun 18, 2025 |
| Certified by provider | Jun 18, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Hospitalist Primary | 208M00000X | 65797 | WI |
| Internal Medicine | 207R00000X | 65797-21 | WI |
| Internal Medicine | 207R00000X | 125-062888 | 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) | Enrolled Practitioner - Hospitalist (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 75 |
|---|---|
| Services billed | 211 across 5 procedure codes |
| Paid by Medicare | $13,759 |
Part D prescriptions in 2024
| Prescriptions (claims) | 430 · 448 30-day fills |
|---|---|
| Patients | 75 |
| Total drug cost | $19,488 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | Lake Erie College of Osteopathic Medicine, Erie |
|---|---|
| Graduation year | 2013 |
| Medicare specialty | Hospitalist |
Medical group
- McHs Hospitals IncMarshfield, WI · 1,197 clinicians
Hospital affiliations
- Marshfield Medical CenterMarshfield, WI
- Marshfield Medical Center - MinocquaMinocqua, WI
- Marshfield Medical Center - WestonWeston, WI
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 15 hospitalists in Weston · All hospitalists in Wisconsin