Walter J. Willoughby Jr., MD
NPI 1376592477ActiveIndividual· Internal Medicine, Pulmonary Disease· Las Vegas, NV
Internal Medicine, Pulmonary Disease (MD) in Las Vegas, Nevada, trained at Wayne State University School of Medicine (class of 1975). In 2024 Medicare paid $1,770,442 for 352 patients, and Part D covered 2,761 of their prescriptions, 54% of them generic. Astrazeneca Pharmaceuticals LP was the largest of 14 companies reporting payments in 2025, $2,096 in all, mostly food and beverage.
Overview
| NPI | 1376592477 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | May 8, 2006 |
| Last updated in NPPES | Nov 3, 2025 |
| Certified by provider | Nov 3, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Pulmonary Disease Primary | 207RP1001X | 4004 | NV |
| Internal Medicine, Critical Care Medicine | 207RC0200X | 4004 | NV |
| Internal Medicine, Sleep Medicine | 207RS0012X | 4004 | NV |
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 - Pulmonary Disease (NV) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 352 |
|---|---|
| Services billed | 113,845 across 31 procedure codes |
| Paid by Medicare | $1,770,442 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,761 · 3,603 30-day fills |
|---|---|
| Patients | 358 |
| Total drug cost | $2,152,413 |
| Generic share | 54% of claims |
Education and affiliations
| Medical school | Wayne State University School of Medicine |
|---|---|
| Graduation year | 1975 |
| Medicare specialty | Pulmonary Disease |
| Secondary specialties | Critical Care (Intensivists), Internal Medicine |
Industry payments (Open Payments)
- 2025$2,096 · 120 payments from 14 companies
- 2024$1,391 · 85 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $756.04 | 54 |
| Amgen Inc. | $231.77 | 14 |
| Regeneron Healthcare Solutions, Inc. | $217.52 | 11 |
| Genzyme Corporation | $207.01 | 11 |
| Axsome Therapeutics, Inc. | $151.81 | 9 |
What the 2025 payments were for
- Food and Beverage$1,945 · 117 payments
- Education$151.33 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 60 pulmonologists in Las Vegas · All pulmonologists in Nevada