Matthias Weiss, MD
NPI 1245336759ActiveIndividual· Internal Medicine, Hematology & Oncology· La Crosse, WI
Internal Medicine, Hematology & Oncology (MD) with Thedacare, Incorporated, practicing in La Crosse, Wisconsin. Mostly services rather than prescriptions: Medicare paid $30,309 for 38 patients in 2024, with only 24 Part D claims. Adc Therapeutics America, Inc. reported $103.25 in payments in 2025, mostly food and beverage. Lists Thedacare Medical Center - Shawano and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1245336759 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Sep 15, 2006 |
| Last updated in NPPES | Oct 18, 2021 |
| Certified by provider | Oct 18, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | 30093 | 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 - Hematology/Oncology (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 38 |
|---|---|
| Services billed | 782 across 25 procedure codes |
| Paid by Medicare | $30,309 |
Part D prescriptions in 2024
| Prescriptions (claims) | 24 · 27 30-day fills |
|---|---|
| Patients | 12 |
| Total drug cost | $3,240 |
| Generic share | 83% of claims |
Education and affiliations
| Graduation year | 1986 |
|---|---|
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Internal Medicine |
Medical group
- Thedacare, IncorporatedWaupaca, WI · 647 clinicians
Hospital affiliations
- Thedacare Medical Center - ShawanoShawano, WI
- Thedacare Medical Center-WaupacaWaupaca, WI
- Thedacare Regional Medical Center - Appleton IncAppleton, WI
Industry payments (Open Payments)
- 2025$103.25 · 1 payment from 1 company
- 2024$248.96 · 4 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Adc Therapeutics America, Inc. | $103.25 | 1 |
What the 2025 payments were for
- Food and Beverage$103.25 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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