Vibha Nayak, MD
Nephrology · Louisville, KYNPI 1245443555
Payments from drug & device makers
What this record shows
This record is dominated by food and beverage: $581 of the $747 with a category attached, or 77.8%. 7 manufacturers reported payments, led by Mallinckrodt Hospital Products Inc. at 22.2% of the total. 2025 is the largest year on record at $239, 3.4 times the $70 reported in 2019. That places this record below the midpoint for nephrology clinicians in KY, where the typical reported total is $1,122.
Across 11 payments — averaging $67.88 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Mallinckrodt Hospital Products Inc.$166
- Abbott$143
- Nxstage Medical, Inc.$141
- Bayer$120
- Ardelyx, Inc.$120
- Baxter Healthcare$36
- plus $22 from 1 others
What the payments were for
- Food & beverage$58178%
- Education$16622%
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 |
|---|---|---|
| Mallinckrodt Hospital Products Inc. | 2 | $166 |
| Abbott | 1 | $143 |
| Nxstage Medical, Inc. | 3 | $141 |
| Bayer | 1 | $120 |
| Ardelyx, Inc. | 1 | $120 |
| Baxter Healthcare | 2 | $36 |
| Vifor Pharma, Inc. | 1 | $22 |
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.
- CardioMEMS HF System$143
- Kerendia$120
- XPHOZAH 30 MG$120
How this compares
$747 in reported general payments places this provider in the 40th percentile of 165 nephrology providers in Kentucky.
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 |
|---|---|---|
| Sevelamer Carbonate | 29 | $2,923 |
| Midodrine Hcl | 14 | $1,803 |
| Atomoxetine Hcl | 11 | $1,028 |
| Losartan Potassium | 82 | $416 |
| Allopurinol | 64 | $316 |
| Potassium Chloride | 18 | $292 |
| Amlodipine Besylate | 47 | $287 |
| Omeprazole | 15 | $233 |
| Furosemide | 79 | $224 |
| Carvedilol | 43 | $164 |
| Hydralazine Hcl | 13 | $138 |
| Famotidine | 23 | $124 |
| Hydrochlorothiazide | 29 | $102 |
| Lisinopril | 20 | $90 |
Paid to pharmacies, not to this prescriber.
Other nephrology in Louisville
- Danny WooLouisville$427K
- Dawn CasterLouisville$193K
- Nizar AttallahLouisville$113K
- Shafic Abdul Wahab El HindiLouisville$45K
- George AronoffLouisville$26K
- Jai BhimaniLouisville$10K
- Alexander AfanasyevLouisville$10K
- William DuffLouisville$9K
- Bhagwan BhimaniLouisville$7K
- Aziz ChamiLouisville$6K
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.