Arjun Seth, MD
Neuromuscular Medicine · Chicago, ILNPI 1467815506
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $61,120 of the $72,353 with a category attached, or 84.5%. 11 manufacturers reported payments, led by Argenx US, Inc. at 42.2% of the total. 2025 is the largest year on record at $49,073, more than ten times the $4,830 reported in 2023. Among neuromuscular medicine clinicians in IL 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 106 payments — averaging $682.57 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Argenx US, Inc.$31K
- Amgen$13K
- UCB, Inc.$10K
- AstraZeneca$8K
- Sanofi$6K
- Johnson & Johnson$3K
- plus $2K from 5 others
Across 99 payments — averaging $6900.18 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.
- Argenx US, Inc.$683K
What the payments were for
- Consulting fees$61,12084%
- Speaking & faculty fees$1,1252%
- Travel & lodging$6,7539%
- Food & beverage$3,3545%
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 |
|---|---|---|
| Argenx US, Inc. | 54 | $30,517 |
| Amgen | 14 | $12,584 |
| UCB, Inc. | 20 | $9,740 |
| AstraZeneca(2 entities) | 6 | $8,029 |
| Sanofi | 3 | $5,973 |
| Johnson & Johnson | 3 | $3,440 |
| Janssen Scientific Affairs, LLC | 1 | $1,125 |
| Takeda Pharmaceuticals U.S.A., Inc. | 1 | $701 |
| Alnylam Pharmaceuticals Inc. | 1 | $106 |
| Genentech USA, Inc. | 1 | $92 |
| Kedrion Biopharma, Inc. | 2 | $44 |
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
$72,353 in reported general payments places this provider in the 90th percentile of 21 neuromuscular medicine 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 |
|---|---|---|
| HizentraImmun Glob G(Igg)/Pro/Iga 0-50 | 138 | $1,330,283 |
| Gamunex-CImmune Globul G/Gly/Iga Avg 46 | 89 | $766,945 |
| Gammagard LiquidImmun Glob G(Igg)/Gly/Iga Ov50 | 40 | $583,903 |
| GammaplexImmun Glob G(Igg)/Gly/Iga 0-50 | 26 | $394,896 |
| PrivigenImmun Glob G(Igg)/Pro/Iga 0-50 | 14 | $202,648 |
| GammakedImmune Globul G/Gly/Iga Avg 46 | 17 | $173,804 |
| OctagamImmun Globg(Igg)/Malt/Iga Ov50 | 20 | $147,047 |
| Mycophenolate Mofetil | 38 | $4,279 |
| Pyridostigmine Bromide | 45 | $3,926 |
| Pregabalin | 47 | $3,434 |
| Gabapentin | 87 | $1,646 |
| Prednisone | 134 | $873 |
| Sodium Chloride0.9 % Sodium Chloride | 81 | $616 |
| Methylprednisolone Sodium SuccMethylprednisolone Sod Succ | 22 | $597 |
| MethotrexateMethotrexate Sodium | 16 | $264 |
Paid to pharmacies, not to this prescriber.
Companies that both paid and supply prescribed drugs
These companies both reported payments to this provider and make drugs the provider prescribed under Medicare Part D in 2024. For most specialties this overlap is expected — a cardiologist who is paid by a cardiology drugmaker also treats heart disease. It is shown so the reader can see it, not because it implies anything on its own.
| Company | Paid to this provider | Part D cost of their drugs |
|---|---|---|
| Takeda Pharmaceuticals U.S.A., Inc.Gammagard Liquid | $701 | $583,90340 claims |
| Kedrion Biopharma, Inc.Gammaked | $44 | $173,80417 claims |
Reading this fairly. The Part D column is what drug plans and patients paid pharmacies — this provider received none of it, and it reflects how many patients they treat and what those drugs cost. Against peers, this provider's reported payments sit in the 90th percentile of 21 neuromuscular medicine providers in Illinois.
Other neuromuscular medicine in Chicago
- Abigail SchwaedeChicago$73K
- Erik PioroChicago$45K
- Senda Ajroud DrissChicago$23K
- Robert KalbChicago$22K
- Daniela MenichellaChicago$11K
- Robert SufitChicago$4K
- Richard HarveyChicago$3K
- Kyle MardenChicago$1K
- Gyeongmo SohnChicago$1K
- Adenike AdewuyiChicago$495
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.