Donald Walker, MD
Diagnostic Radiology · Knoxville, TNNPI 1669664033
Payments from drug & device makers
What this record shows
This record is dominated by food and beverage: $4,202 of the $6,663 with a category attached, or 63.1%. 9 manufacturers reported payments, led by Inari Medical, Inc. at 42.5% of the total. Among diagnostic radiology clinicians in TN 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.
Across 66 payments — averaging $100.95 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Inari Medical, Inc.$3K
- Sirtex Medical Inc$2K
- Getinge USA Sales, LLC$834
- Boston Scientific$660
- Medtronic$189
- Trisalus Life Sciences, Inc.$166
- plus $86 from 3 others
Across 52 payments — averaging $1622.93 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.
- Inari Medical, Inc.$84K
What the payments were for
- Travel & lodging$2,46137%
- Food & beverage$4,20263%
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 |
|---|---|---|
| Inari Medical, Inc. | 25 | $2,829 |
| Sirtex Medical Inc | 8 | $1,898 |
| Getinge USA Sales, LLC | 17 | $834 |
| Boston Scientific | 10 | $660 |
| Medtronic | 1 | $189 |
| Trisalus Life Sciences, Inc. | 2 | $166 |
| Teleflex LLC | 1 | $37 |
| BD | 1 | $35 |
| Cardinal Health 200 LLC | 1 | $14 |
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
$6,663 in reported general payments places this provider in the 95th percentile of 757 diagnostic radiology 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.
Other diagnostic radiology in Knoxville
- Gregory MinwellKnoxville$105K
- Daniel HossKnoxville$70K
- Jeffrey MahonyKnoxville$58K
- Robert EberlyKnoxville$42K
- Noel BergquistKnoxville$38K
- Andrew NicholsonKnoxville$35K
- Dana FathyKnoxville$30K
- Amanda SquiresKnoxville$17K
- John GoodwinKnoxville$9K
- Matthew RamseyKnoxville$7K
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.