Oscar Grandas, MD
Vascular Surgery · Knoxville, TNNPI 1366550014
Payments from drug & device makers
What this record shows
The money is spread across several categories — travel and lodging (35.3%), food and beverage and consulting fees — rather than concentrated in one kind of arrangement. Medtronic accounts for 60.9% of it on its own, with 11 other manufacturers making up the rest. Reporting peaked in 2019 at $5,860 and has fallen 96.1% since, to $226 in 2025.
Across 62 payments — averaging $137.87 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Medtronic$5K
- Silk Road Medical, Inc.$2K
- Bard Peripheral Vascular, Inc.$1K
- Inari Medical, Inc.$352
- Veloxis Pharmaceuticals, Inc.$125
- Humacyte Global, Inc.$45
- plus $153 from 6 others
Across 7 payments — averaging $1215.31 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.
- Humacyte Global, Inc.$9K
What the payments were for
- Consulting fees$2,60030%
- Travel & lodging$3,02135%
- Food & beverage$2,92734%
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 |
|---|---|---|
| Medtronic(2 entities) | 30 | $5,209 |
| Silk Road Medical, Inc. | 15 | $1,560 |
| Bard Peripheral Vascular, Inc. | 6 | $1,104 |
| Inari Medical, Inc. | 3 | $352 |
| Veloxis Pharmaceuticals, Inc. | 1 | $125 |
| Humacyte Global, Inc. | 1 | $45 |
| Endologix LLC | 1 | $38 |
| Calliditas Therapeutics US Inc. | 1 | $25 |
| Mozarc Medical US LLC | 1 | $24 |
| Merck | 1 | $24 |
| Abbott | 1 | $23 |
| Ossur Americas, Inc. | 1 | $18 |
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.
- IN.PACT Admiral$4,060
- ENROUTE Transcarotid Neuroprotection System$996
- ENROUTE Transcarotid Stent System$890
- ENHANCE Transcarotid Peripheral Access Kit$890
- ENROUTE 0.014 Guidewire$890
- Endurant$278
- CT THROMBECTOMY SYSTEM KIT$271
- FLOWTRIEVER CATHETER, S$271
- Envarsus$250
- CareLink$131
- ENROUTE Transcarotid Stent$107
- IN.PACT AV$104
How this compares
$8,548 in reported general payments places this provider in the 55th percentile of 117 vascular surgery providers in Tennessee.
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 |
|---|---|---|
| EliquisApixaban | 60 | $38,479 |
| Valganciclovir Hcl | 67 | $11,513 |
| Cinacalcet Hcl | 39 | $9,947 |
| Carvedilol ErCarvedilol Phosphate | 13 | $4,412 |
| Cyclosporine ModifiedCyclosporine, Modified | 14 | $3,026 |
| Lantus SolostarInsulin Glargine,hum.Rec.Anlog | 35 | $2,839 |
| Famotidine | 286 | $2,451 |
| Prednisone | 449 | $2,138 |
| Tacrolimus | 59 | $1,746 |
| Mycophenolate Mofetil | 39 | $1,473 |
| Novolog FlexpenInsulin Aspart | 11 | $1,380 |
| Rosuvastatin Calcium | 169 | $1,206 |
| Bumetanide | 43 | $1,136 |
| Amlodipine Besylate | 171 | $983 |
| Potassium Chloride | 33 | $812 |
Paid to pharmacies, not to this prescriber.
Other vascular surgery in Knoxville
- Scott StevensKnoxville$53K
- Christopher PollockKnoxville$31K
- Christopher CallicuttKnoxville$14K
- Afshin SkibbaKnoxville$13K
- Michael McNallyKnoxville$9K
- Stephen TonksKnoxville$8K
- Andrew KropilakKnoxville$6K
- Daniel ClairNashville$993K
- Anton Dias PereraGermantown$832K
- Bryan FisherHendersonville$417K
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.