Bertha Ayi
Infectious Disease · Sioux Falls, SDNPI 1083670343
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 97.7% of the total across 8 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. 7 manufacturers reported payments, led by AbbVie at 22.0% of the total. Reporting peaked in 2019 at $606 and has fallen 93.4% since, to $40 in 2025. Among infectious disease clinicians in SD with any reported payments, this total sits in the top 10% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 8 payments — averaging $86.50 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- AbbVie$153
- Johnson & Johnson$125
- E.r. Squibb & Sons, L.L.C.$125
- Viiv Healthcare Company$125
- Paratek Pharmaceuticals, Inc.$109
- Merck$40
- plus $16 from 1 others
What the payments were for
- Food & beverage$67698%
- Education$162%
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 |
|---|---|---|
| AbbVie(2 entities) | 2 | $153 |
| Johnson & Johnson | 1 | $125 |
| E.r. Squibb & Sons, L.L.C. | 1 | $125 |
| Viiv Healthcare Company | 1 | $125 |
| Paratek Pharmaceuticals, Inc. | 1 | $109 |
| Merck | 1 | $40 |
| Insmed, Inc. | 1 | $16 |
What the payments were tied to
Products named in the reported payments. Only payments of $100 or more are attributed here — the typical reported payment nationally is a meal worth about $16, and listing those product-by-product would be noise.
How this compares
$692 in reported general payments places this provider in the 90th percentile of 22 infectious disease providers in South Dakota.
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 |
|---|---|---|
| BiktarvyBictegrav/Emtricit/Tenofov Ala | 16 | $62,028 |
| Daptomycin | 17 | $7,275 |
| Vancomycin Hcl | 14 | $3,665 |
| Atovaquone-Proguanil HclAtovaquone/Proguanil Hcl | 12 | $2,133 |
| Fluconazole | 13 | $1,142 |
| Cefazolin Sodium | 33 | $703 |
| Cephalexin | 18 | $663 |
| CeftriaxoneCeftriaxone Sodium | 21 | $383 |
| Sulfamethoxazole-TrimethoprimSulfamethoxazole/Trimethoprim | 13 | $229 |
| Azithromycin | 24 | $188 |
| Ciprofloxacin Hcl | 22 | $181 |
Paid to pharmacies, not to this prescriber.
Other infectious disease in Sioux Falls
- Robert KesslerSioux Falls$494
- Jose Suarez IsaacsSioux Falls$266
- Asma SyedSioux Falls$211
- Jawad NazirSioux Falls$153
- Brian PepitoSioux Falls$153
- Emad Abu SittaSioux Falls$149
- Miguel Cervera HernandezSioux Falls$137
- Nirmal MuthukumarasamySioux Falls$105
- Gerard DavidSioux Falls$96
- Wendell HoffmanSioux Falls$89
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.