William G. Matthaeus, MD
NPI 1326039074ActiveIndividual· Internal Medicine, Hematology & Oncology· Milwaukee, WI
Internal Medicine, Hematology & Oncology (MD) in Milwaukee, Wisconsin, trained at Medical College of Wisconsin (class of 1983). Their prescriptions cost Medicare Part D more than their services did: $4,542,815 for 1,523 claims, against $42,436 paid for services in 2024.
Overview
| NPI | 1326039074 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Nov 2, 2005 |
| Last updated in NPPES | Sep 24, 2024 |
| Certified by provider | Sep 24, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | 25992 | WI |
| Internal Medicine, Hospice and Palliative Medicine | 207RH0002X | 25992 | 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 | 213 |
|---|---|
| Services billed | 624 across 14 procedure codes |
| Paid by Medicare | $42,436 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,523 · 2,200 30-day fills |
|---|---|
| Patients | 226 |
| Total drug cost | $4,542,815 |
| Generic share | 72% of claims |
Education and affiliations
| Medical school | Medical College of Wisconsin |
|---|---|
| Graduation year | 1983 |
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Hospice/Palliative Care |
| Telehealth | Offers telehealth |
Medical groups
- Aurora Health Care Metro, Inc.Milwaukee, WI · 75 clinicians
- Aurora Health Care Central, Inc.Sheboygan, WI · 10 clinicians
Hospital affiliations
- Aurora Medical Center Sheboygan CountySheboygan, WI
- Aurora St Lukes Medical CenterMilwaukee, WI
- West Allis Memorial HospitalWest Allis, WI
Other facilities
- Aurora at HomeHospice · Wauwatosa, 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 108 hematologist-oncologists in Milwaukee · All hematologist-oncologists in Wisconsin