William Walton Roberts, M.D.
NPI 1972851145ActiveIndividual· Internal Medicine· Greenville, SC
Internal Medicine (M.D.) in Greenville, South Carolina, trained at Mercer University School of Medicine (class of 2016). Their prescriptions cost Medicare Part D more than their services did: $317,650 for 2,801 claims, against $67,006 paid for services in 2024. Calyxo, Inc. was the largest of 2 companies reporting payments in 2025, $7,450 in all, mostly consulting fees.
Overview
| NPI | 1972851145 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 20, 2012 |
| Last updated in NPPES | Mar 4, 2024 |
| Certified by provider | Mar 4, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 39525 | SC |
| Pediatrics | 208000000X | LL39525 | SC |
| Internal Medicine | 207R00000X | LL39525 | SC |
| Pediatrics | 208000000X | 39525 | SC |
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 - Internal Medicine (SC) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 149 |
|---|---|
| Services billed | 1,405 across 50 procedure codes |
| Paid by Medicare | $67,006 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,801 · 6,168 30-day fills |
|---|---|
| Patients | 254 |
| Total drug cost | $317,650 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | Mercer University School of Medicine |
|---|---|
| Graduation year | 2016 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Prisma Health University Medical GroupGreenville, SC · 2,493 clinicians
Hospital affiliations
- Prisma Health Patewood HospitalGreenville, SC
- Prisma Health Baptist Easley HospitalEasley, SC
- Prisma Health Greenville Memorial HospitalGreenville, SC
- Prisma Health Greer Memorial HospitalSpartanburg, SC
- St Francis-DowntownGreenville, SC
Other facilities
- Prisma Health North Greenville LtachLong-term care hospital · Travelers Rest, SC
Industry payments (Open Payments)
- 2025$7,450 · 5 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Calyxo, Inc. | $7,425 | 4 |
| Viiv Healthcare Company | $24.82 | 1 |
What the 2025 payments were for
- Consulting Fee$7,425 · 4 payments
- Food and Beverage$24.82 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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