Woojin James Chon, MD
Nephrology · Hines, ILNPI 1356375406
Payments from drug & device makers
What this record shows
The money is spread across several categories — consulting fees (54.4%), food and beverage and education — rather than concentrated in one kind of arrangement. 4 manufacturers reported payments, led by Baxter Healthcare at 54.4% of the total. Reporting peaked in 2021 at $345 and has fallen 90.6% since, to $32 in 2025. That places this record below the midpoint for nephrology clinicians in IL, where the typical reported total is $635.
Across 6 payments — averaging $105.61 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Baxter Healthcare$345
- Mallinckrodt Enterprises LLC$216
- Veloxis Pharmaceuticals, Inc.$58
- Merck$14
Across 5 payments — averaging $214,075 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.
- Emergent Biosolutions Inc.$1.1M
What the payments were for
- Consulting fees$34554%
- Food & beverage$24939%
- Education$406%
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 |
|---|---|---|
| Baxter Healthcare | 1 | $345 |
| Mallinckrodt Enterprises LLC | 2 | $216 |
| Veloxis Pharmaceuticals, Inc. | 2 | $58 |
| Merck | 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.
- Renal - CRRT$345
- ACTHAR$216
How this compares
$634 in reported general payments places this provider in the 45th percentile of 524 nephrology providers in Illinois.
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 |
|---|---|---|
| LokelmaSodium Zirconium Cyclosilicate | 16 | $20,741 |
| Valganciclovir Hcl | 22 | $10,905 |
| Lantus SolostarInsulin Glargine,hum.Rec.Anlog | 16 | $1,681 |
| Nifedipine ErNifedipine | 95 | $1,249 |
| Cinacalcet Hcl | 34 | $1,248 |
| Labetalol Hcl | 33 | $1,023 |
| Ultra-Fine Nano Pen NeedlePen Needle, Diabetic | 12 | $693 |
| Metoprolol Succinate | 26 | $414 |
| Carvedilol | 55 | $380 |
| Tamsulosin Hcl | 15 | $223 |
| Amlodipine Besylate | 38 | $195 |
| Prednisone | 32 | $170 |
| Alcohol Prep PadsAlcohol Antiseptic Pads | 16 | $145 |
| Hydralazine Hcl | 13 | $139 |
| Metoprolol Tartrate | 44 | $136 |
Paid to pharmacies, not to this prescriber.
Other nephrology in Hines
- Myles WolfChicago$2.1M
- Mohammed AhmedBolingbrook$1.1M
- Anis RaufHinsdale$453K
- Juan LermaEvergreen Park$351K
- Stuart SpragueEvanston$337K
- Suneel UdaniHinsdale$336K
- Susan QuagginChicago$262K
- Nicole StankusChicago$235K
- Omaima DeganiGurnee$184K
- Merry DownerSpringfield$156K
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.