Aileen Zhen, DO
Nephrology · Springfield, ILNPI 1174985998
Payments from drug & device makers
Across 19 payments — averaging $20.00 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Novartis$114
- Amgen$90
- Novo Nordisk$36
- Cormedix Inc.$26
- Scpharmaceuticals Inc.$24
- Calliditas Therapeutics US Inc.$19
- plus $70 from 4 others
What the payments were for
- Food & beverage$380100%
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 |
|---|---|---|
| Novartis | 6 | $114 |
| Amgen | 4 | $90 |
| Novo Nordisk | 2 | $36 |
| Cormedix Inc. | 1 | $26 |
| Scpharmaceuticals Inc. | 1 | $24 |
| Calliditas Therapeutics US Inc. | 1 | $19 |
| Nxstage Medical, Inc. | 1 | $19 |
| Fresenius USA Marketing, Inc. | 1 | $19 |
| Baxter Healthcare | 1 | $17 |
| AbbVie | 1 | $15 |
How this compares
$380 in reported general payments places this provider in the 35th 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 |
|---|---|---|
| FarxigaDapagliflozin Propanediol | 66 | $58,624 |
| JardianceEmpagliflozin | 66 | $52,501 |
| LokelmaSodium Zirconium Cyclosilicate | 33 | $25,599 |
| Sevelamer Carbonate | 55 | $21,563 |
| Potassium Chloride | 208 | $4,840 |
| Calcitriol | 174 | $1,718 |
| Torsemide | 93 | $1,467 |
| Losartan Potassium | 164 | $1,238 |
| Amlodipine Besylate | 195 | $1,071 |
| Tamsulosin Hcl | 68 | $904 |
| Calcium Acetate | 14 | $885 |
| Bumetanide | 28 | $817 |
| Lisinopril | 152 | $732 |
| Nifedipine ErNifedipine | 27 | $641 |
| Doxazosin Mesylate | 48 | $603 |
Paid to pharmacies, not to this prescriber.
Other nephrology in Springfield
- Merry DownerSpringfield$156K
- Myles WolfChicago$22.4M
- Suneel UdaniHinsdale$6.8M
- Paul CrawfordEvergreen Park$3.1M
- Beatrice ConcepcionChicago$2.6M
- April KennedyChicago$1.8M
- Khaleel SayeedChicago$1.7M
- Woojin James ChonHines$1.1M
- Mohammed AhmedBolingbrook$1.1M
- Tamara IsakovaChicago$763K
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.