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Michael Knox, MD

Vascular & Interventional Radiology · Grand Rapids, MINPI 1386663920

Payments from drug & device makers

What this record shows

This record is dominated by consulting fees: $227,400 of the $311,770 with a category attached, or 72.9%. Inari Medical, Inc. accounts for 98.1% of it on its own, with 16 other manufacturers making up the rest. Reporting peaked in 2021 at $117,554 and has fallen 97.5% since, to $2,997 in 2025. Among vascular & interventional radiology clinicians in MI with any reported payments, this total sits in the top 5% — high for the specialty, which is a reason to read the composition above rather than the number alone.

$311,770in general payments, 2019–2025

Across 223 payments — averaging $1398.07 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.

  • Inari Medical, Inc.$306K
  • Penumbra, Inc.$2K
  • Terumo Medical Corporation$1K
  • Stryker$914
  • Boston Scientific$582
  • Sirtex Medical Inc$278
  • plus $1K from 11 others
$18,125in research payments, 2019–2025

Across 6 payments — averaging $3020.83 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.

  • Boston Scientific$11K
  • EKOS Corporation$8K

What the payments were for

  • Consulting fees$227,40073%
  • Speaking & faculty fees$56,55018%
  • Travel & lodging$13,5604%
  • Food & beverage$14,2615%

General payments by program year

19
20
21
22
23
24
25

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.

CompanyPaymentsTotal
Inari Medical, Inc.164$305,906
Penumbra, Inc.14$1,587
Terumo Medical Corporation11$1,106
Stryker10$914
Boston Scientific6$582
Sirtex Medical Inc2$278
Siemens Medical Solutions USA, Inc.2$260
Okami Medical, Inc.1$198
Trisalus Life Sciences, Inc.2$172
Johnson & Johnson(2 entities)2$151
Imperative Care, Inc1$143
Medtronic2$138
Biocompatibles, Inc.1$129
Cook Medical LLC1$125
Bard Peripheral Vascular, Inc.2$47
Abbott1$24
Angiodynamics, Inc.1$11

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

$311,770 in reported general payments places this provider in the 95th percentile of 118 vascular & interventional radiology providers in Michigan.

See all vascular & interventional radiology providers in Michigan →

Medicare billing

Part B allowed, 2024
$84,461
Medicare patients
1,452
Services billed
2,246

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

DrugClaimsCost to plans & patients
Prednisone11$15

Paid to pharmacies, not to this prescriber.

Other vascular & interventional radiology in Grand Rapids

See the full list for Michigan →

Where these figures come from

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