Christina Glenn, MD
Thoracic Surgery (Cardiothoracic Vascular Surgery) · Knoxville, TNNPI 1609188754
Payments from drug & device makers
What this record shows
The money is spread across several categories — education (42.8%), food and beverage and travel and lodging — rather than concentrated in one kind of arrangement. Intuitive Surgical accounts for 79.0% of it on its own, with 25 other manufacturers making up the rest. Reporting peaked in 2020 at $4,172 and has fallen 80.8% since, to $800 in 2025.
Across 89 payments — averaging $79.34 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Intuitive Surgical$6K
- Atricure, Inc.$282
- Johnson & Johnson$181
- Merck$100
- Genentech USA, Inc.$88
- Smoky Mountain Surgical LLC$87
- plus $742 from 20 others
What the payments were for
- Travel & lodging$1,86926%
- Food & beverage$2,17231%
- Education$3,02043%
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 |
|---|---|---|
| Intuitive Surgical | 24 | $5,580 |
| Atricure, Inc. | 16 | $282 |
| Johnson & Johnson | 6 | $181 |
| Merck | 3 | $100 |
| Genentech USA, Inc. | 5 | $88 |
| Smoky Mountain Surgical LLC | 4 | $87 |
| Octapharma USA, Inc. | 2 | $81 |
| Regeneron Healthcare Solutions, Inc. | 2 | $79 |
| AstraZeneca | 3 | $74 |
| Zimmer Biomet | 3 | $68 |
| Medtronic | 2 | $61 |
| Baxter Healthcare | 2 | $56 |
| ZOLL Services LLC (a/k/a ZOLL Lifecor Corp) | 3 | $45 |
| Bolton Medical Inc | 1 | $32 |
| La Jolla Pharmaceutical Company | 1 | $27 |
| Iovance Biotherapeutics, Inc. | 1 | $25 |
| Abbott | 1 | $24 |
| Davol Inc. | 1 | $24 |
| Tempus AI, Inc | 1 | $23 |
| CSL Behring | 1 | $20 |
| Caris MPI, Inc. | 1 | $20 |
| Stryker | 1 | $19 |
| Acera Surgical, Inc. | 1 | $19 |
| Sanara Medtech Inc. | 2 | $17 |
| Kls-martin L.p. | 1 | $15 |
| Teleflex LLC | 1 | $15 |
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.
- Da Vinci Surgical System$4,694
How this compares
$7,061 in reported general payments places this provider in the 60th percentile of 115 thoracic surgery (cardiothoracic vascular surgery) providers in Tennessee.
See all thoracic surgery (cardiothoracic 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.
Other thoracic surgery (cardiothoracic vascular surgery) in Knoxville
- Christian ProbstKnoxville$25K
- Sean JordanKnoxville$8K
- Raymond DieterKnoxville$8K
- David GrahamKnoxville$6K
- Kimberly LindenKnoxville$6K
- William McAlexanderKnoxville$5K
- Carlo Martinez TorresKnoxville$5K
- William WalkerKnoxville$4K
- Grayson WheatleyNashville$900K
- V ReddyNashville$760K
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.