Ryan Whitaker, MD
Radiation Oncology · Dickson, TNNPI 1194266304
Payments from drug & device makers
What this record shows
This record is dominated by speaking fees: $5,093 of the $6,214 with a category attached, or 82.0%. Lantheus Medical Imaging, Inc. accounts for 90.0% of it on its own, with 5 other manufacturers making up the rest. 2025 is the largest year on record at $5,847, more than ten times the $149 reported in 2023. Among radiation oncology clinicians in TN with any reported payments, this total sits in the top 10% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 12 payments — averaging $517.81 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Lantheus Medical Imaging, Inc.$6K
- Reflexion Medical, Inc.$156
- Novocure Inc.$149
- Gilead$147
- AstraZeneca$109
- Siemens Medical Solutions USA, Inc.$61
Across 5 payments — averaging $34,933 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.
- AstraZeneca$98K
- Merck$77K
What the payments were for
- Speaking & faculty fees$5,09382%
- Travel & lodging$3596%
- Food & beverage$76212%
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 |
|---|---|---|
| Lantheus Medical Imaging, Inc. | 5 | $5,592 |
| Reflexion Medical, Inc. | 1 | $156 |
| Novocure Inc. | 1 | $149 |
| Gilead | 1 | $147 |
| AstraZeneca | 2 | $109 |
| Siemens Medical Solutions USA, Inc. | 2 | $61 |
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
$6,214 in reported general payments places this provider in the 90th percentile of 115 radiation oncology 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 |
|---|---|---|
| Ondansetron OdtOndansetron | 14 | $211 |
| Dexamethasone | 12 | $165 |
| Oxycodone Hcl | 14 | $107 |
Paid to pharmacies, not to this prescriber.
Other radiation oncology in Dickson
- Han-Chih ChangNashville$66K
- Karen WinkfieldNashville$53K
- James GrayNashville$46K
- David RobergeMemphis$28K
- Matthew BalloMemphis$25K
- John PhillipsNashville$23K
- Casey LipscombNashville$23K
- Andrew KennedyNashville$18K
- Anthony CmelakNashville$16K
- Daniel WakefieldMemphis$9K
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.