Joan Ryoo, MD
Therapeutic Radiology · Los Angeles, CANPI 1699854596
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 100.0% of the total across 16 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. 10 manufacturers reported payments, led by Siemens Medical Solutions USA, Inc. at 38.1% of the total. 2025 is the largest year on record at $218, 7.4 times the $29 reported in 2019.
Across 16 payments — averaging $35.76 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Siemens Medical Solutions USA, Inc.$218
- GT Medical Technologies, Inc$78
- Elekta, Inc.$67
- Novocure Inc.$55
- Palette Life Sciences, Inc.$51
- Boston Scientific$32
- plus $72 from 4 others
What the payments were for
- Food & beverage$572100%
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 |
|---|---|---|
| Siemens Medical Solutions USA, Inc. | 2 | $218 |
| GT Medical Technologies, Inc | 3 | $78 |
| Elekta, Inc. | 2 | $67 |
| Novocure Inc. | 3 | $55 |
| Palette Life Sciences, Inc. | 1 | $51 |
| Boston Scientific | 1 | $32 |
| Visionrt, Inc. | 1 | $22 |
| Varian Medical Systems, Inc. | 1 | $21 |
| Reflexion Medical, Inc. | 1 | $17 |
| Viewray Technologies Inc | 1 | $12 |
How this compares
Too few therapeutic radiology providers in Californiato place this figure against a meaningful peer group, so we don't.
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 |
|---|---|---|
| SsdSilver Sulfadiazine | 17 | $671 |
| Hydrocortisone | 25 | $603 |
| Tamsulosin Hcl | 36 | $572 |
| Silver Sulfadiazine | 12 | $470 |
| Hydrocodone-AcetaminophenHydrocodone/Acetaminophen | 21 | $215 |
Paid to pharmacies, not to this prescriber.
Other therapeutic radiology in Los Angeles
- John HornsLos Angeles$73
- Mack RoachSan Francisco$40K
- Bryan ChangTorrance$1K
- Robert JohnsonSan Luis Obispo$304
- John ClarkRedding$183
- Reinhard Schultela Jolla$148
- Pauling ChangSunnyvale$137
- Owen KimPorterville$82
- Neena ShahOrange$67
- Bryan LeighSan Clemente$55
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.