Walter Chatham
NPI 1154363315ActiveIndividual· Internal Medicine, Rheumatology· Las Vegas, NV
Internal Medicine, Rheumatology in Las Vegas, Nevada, trained at Vanderbilt University School of Medicine (class of 1980). Their prescriptions cost Medicare Part D more than their services did: $694,074 for 665 claims, against $16,956 paid for services in 2024. Sobi, Inc was the largest of 13 companies reporting payments in 2025, $68,208 in all, mostly speaking and faculty fees.
Overview
| NPI | 1154363315 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Sole proprietor | No |
| NPI issued | Jun 12, 2006 |
| Last updated in NPPES | Jun 30, 2023 |
| Certified by provider | Jun 16, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Rheumatology Primary | 207RR0500X | 12575 | AL |
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 - Rheumatology (AL); Practitioner - Rheumatology (NV) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 88 |
|---|---|
| Services billed | 213 across 19 procedure codes |
| Paid by Medicare | $16,956 |
Part D prescriptions in 2024
| Prescriptions (claims) | 665 · 1,028 30-day fills |
|---|---|
| Patients | 135 |
| Total drug cost | $694,074 |
| Generic share | 80% of claims |
Education and affiliations
| Medical school | Vanderbilt University School of Medicine |
|---|---|
| Graduation year | 1980 |
| Medicare specialty | Rheumatology |
Medical group
- Unlv MedicineLas Vegas, NV · 177 clinicians
Hospital affiliation
- University Medical CenterLas Vegas, NV
Industry payments (Open Payments)
- 2025$68,208 · 82 payments from 13 companies
- 2024$15,557 · 50 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Sobi, Inc | $53,261 | 36 |
| Glaxosmithkline, LLC. | $8,003 | 10 |
| Amgen Inc. | $5,669 | 16 |
| Abbvie Inc. | $329.81 | 8 |
| Kyowa Kirin, Inc. | $274.90 | 4 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$37,026 · 7 payments
- Consulting Fee$21,197 · 6 payments
- Travel and Lodging$6,295 · 17 payments
- Food and Beverage$3,690 · 52 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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