William S. Walker, NP
NPI 1487640033ActiveIndividual· Nurse Practitioner, Family· Washington, IN
Nurse Practitioner, Family (NP) with St Marys Medical Group LLC and 1 other group, practicing in Washington, Indiana. Mostly services rather than prescriptions: Medicare paid $6,162 for 69 patients in 2024, with only 27 Part D claims. Abiomed was the largest of 3 companies reporting payments in 2025, $108.21 in all, mostly food and beverage. Lists Ascension St Vincent Evansville and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1487640033 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | NP |
| Sole proprietor | No |
| NPI issued | Sep 20, 2005 |
| Last updated in NPPES | Jun 27, 2024 |
| Certified by provider | Jun 27, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Family Primary | 363LF0000X | 71001830A | IN |
| Orthopaedic Surgery, Sports Medicine | 207XX0005X | 71001830A | IN |
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 - Nurse Practitioner (IN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 69 |
|---|---|
| Services billed | 471 across 11 procedure codes |
| Paid by Medicare | $6,162 |
Part D prescriptions in 2024
| Prescriptions (claims) | 27 · 27 30-day fills |
|---|---|
| Patients | 15 |
| Total drug cost | $3,090 |
| Generic share | 81% of claims |
Education and affiliations
| Graduation year | 2004 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical groups
- St Marys Medical Group LLCEvansville, IN · 228 clinicians
- Daviess County HospitalWashington, IN · 67 clinicians
Hospital affiliations
- Ascension St Vincent EvansvilleEvansville, IN
- Daviess Community HospitalWashington, IN
- Memorial Hospital and Health Care CenterJasper, IN
Industry payments (Open Payments)
- 2025$108.21 · 4 payments from 3 companies
- 2024$131.98 · 6 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abiomed | $71.15 | 2 |
| Novartis Pharmaceuticals Corporation | $22.08 | 1 |
| Boston Scientific Corporation | $14.98 | 1 |
What the 2025 payments were for
- Food and Beverage$108.21 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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