Katherine Hartstern, MD
NPI 1437773652ActiveIndividual· Family Medicine· Oshkosh, WI
Family Medicine (MD) with Ascension Medical Group-Fox Valley Wisconsin, Inc, practicing in Oshkosh, Wisconsin. Their prescriptions cost Medicare Part D more than their services did: $131,491 for 2,152 claims, against $17,790 paid for services in 2024. Alexion Pharmaceuticals, Inc. was the largest of 2 companies reporting payments in 2025, $145.24 in all, mostly food and beverage. Lists Ascension Ne Wisconsin - St Elizabeth Campus as a hospital affiliation.
Overview
| NPI | 1437773652 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 3, 2020 |
| Last updated in NPPES | Mar 19, 2025 |
| Certified by provider | Mar 19, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | 82621 | WI |
| Family Medicine | 207Q00000X | 125076039 | 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 - Family Practice (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 56 |
|---|---|
| Services billed | 312 across 26 procedure codes |
| Paid by Medicare | $17,790 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,152 · 4,770 30-day fills |
|---|---|
| Patients | 237 |
| Total drug cost | $131,491 |
| Generic share | 89% of claims |
Education and affiliations
| Graduation year | 2020 |
|---|---|
| Medicare specialty | Family Practice |
Medical group
- Ascension Medical Group-Fox Valley Wisconsin, IncAppleton, WI · 259 clinicians
Hospital affiliation
- Ascension Ne Wisconsin - St Elizabeth CampusAppleton, WI
Industry payments (Open Payments)
- 2025$145.24 · 3 payments from 2 companies
- 2024$13.36 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Alexion Pharmaceuticals, Inc. | $106.38 | 1 |
| Novo Nordisk Inc | $38.86 | 2 |
What the 2025 payments were for
- Food and Beverage$145.24 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 54 family medicine physicians in Oshkosh · All family medicine physicians in Wisconsin