William C. Guenther Jr., M.D.
NPI 1386789618ActiveIndividual· Internal Medicine, Hematology & Oncology· Appleton, WI
Internal Medicine, Hematology & Oncology (M.D.) in Appleton, Wisconsin, licensed in WI, with an NPI issued in February 2007. Enrolled in Medicare as practitioner - medical oncology and practitioner - hematology/oncology.
Overview
| NPI | 1386789618 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Feb 21, 2007 |
| Last updated in NPPES | Jan 10, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | 29203 | WI |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Medical Oncology (NC); Practitioner - Hematology/Oncology (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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