William Westerkam, MD
Physical Medicine & Rehabilitation · Columbia, SCNPI 1255303103
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 100.0% of the total across 10 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. 6 manufacturers reported payments, led by Johnson & Johnson at 40.5% of the total. Reporting peaked in 2019 at $77 and has fallen 79.0% since, to $16 in 2022. That places this record below the midpoint for physical medicine & rehabilitation clinicians in SC, where the typical reported total is $151.
Across 10 payments — averaging $16.30 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Johnson & Johnson$66
- Sunovion Pharmaceuticals Inc.$27
- Abbott$20
- Integra Lifesciences Corporation$20
- Kerecis Limited$18
- Pfizer$11
What the payments were for
- Food & beverage$163100%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
General payments by program year
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| Johnson & Johnson | 4 | $66 |
| Sunovion Pharmaceuticals Inc. | 2 | $27 |
| Abbott | 1 | $20 |
| Integra Lifesciences Corporation | 1 | $20 |
| Kerecis Limited | 1 | $18 |
| Pfizer | 1 | $11 |
How this compares
$163 in reported general payments places this provider in the 50th percentile of 122 physical medicine & rehabilitation providers in South Carolina.
See all physical medicine & rehabilitation providers in South Carolina →
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Gabapentin | 14 | $628 |
| Levothyroxine Sodium | 12 | $212 |
| Lisinopril | 19 | $154 |
Paid to pharmacies, not to this prescriber.
Other physical medicine & rehabilitation in Columbia
- Simonne FrancisColumbia$4K
- Ryan WetzelColumbia$2K
- Wilson van DamColumbia$1K
- Kiran SandrapatyColumbia$503
- Eduardo IrizarryColumbia$329
- John ClavetColumbia$217
- Devin TroyerColumbia$151
- William LorenzFlorence$66K
- Charles NivensBluffton$25K
- Jonathan ChapekisGreer$17K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.