David W. Koeper, MD
NPI 1487698387ActiveIndividual· Internal Medicine, Nephrology· Neenah, WI
Internal Medicine, Nephrology (MD) in Neenah, Wisconsin, trained at Loyola University of Chicago, Stritch School of Medicine (class of 1997). Their prescriptions cost Medicare Part D more than their services did: $386,680 for 780 claims, against $137,119 paid for services in 2024. Calliditas Therapeutics US Inc. was the largest of 19 companies reporting payments in 2025, $860.09 in all, mostly food and beverage.
Overview
| NPI | 1487698387 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 15, 2006 |
| Last updated in NPPES | Feb 10, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 42143 | WI |
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 - General Practice (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 277 |
|---|---|
| Services billed | 1,182 across 23 procedure codes |
| Paid by Medicare | $137,119 |
Part D prescriptions in 2024
| Prescriptions (claims) | 780 · 1,384 30-day fills |
|---|---|
| Patients | 117 |
| Total drug cost | $386,680 |
| Generic share | 78% of claims |
Education and affiliations
| Medical school | Loyola University of Chicago, Stritch School of Medicine |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | General Practice |
| Secondary specialties | Nephrology |
Medical groups
- St Vincent Hospital-Hospital Sisters-Third Order of St FrancisGreen Bay, WI · 603 clinicians
- Fox Valley Nephrology Partners S CNeenah, WI · 12 clinicians
Hospital affiliations
- Ascension Ne Wisconsin - St Elizabeth CampusAppleton, WI
- St Vincent HospitalGreen Bay, WI
- Thedacare Medical Center - Berlin IncBerlin, WI
- Thedacare Regional Med Ctr - NeenahNeenah, WI
- Thedacare Regional Medical Center - Appleton IncAppleton, WI
Other facilities
- Davita Green Lake County DialysisDialysis facility · Berlin, WI
- Fmc Dialysis - AppletonDialysis facility · Appleton, WI
- Fresenius Medical Care OshkoshDialysis facility · Oshkosh, WI
- Fresenius Kidney Care SheboyganDialysis facility · Sheboygan, WI
Industry payments (Open Payments)
- 2025$860.09 · 42 payments from 19 companies
- 2024$796.21 · 40 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Calliditas Therapeutics US Inc. | $128.80 | 5 |
| Novartis Pharmaceuticals Corporation | $113.30 | 5 |
| Otsuka America Pharmaceutical, Inc. | $74.52 | 4 |
| Novo Nordisk Inc | $70.38 | 3 |
| Lilly USA, LLC | $64.62 | 3 |
What the 2025 payments were for
- Food and Beverage$840.43 · 41 payments
- Education$19.66 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other nephrologists in Neenah
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