David Knysak, MD
Allergy & Immunology · Elmhurst, ILNPI 1609876101
Payments from drug & device makers
Across 295 payments — averaging $18.42 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- GSK$1K
- Novartis$1K
- AstraZeneca$870
- Optinose US, Inc.$482
- Sanofi$333
- Regeneron Healthcare Solutions, Inc.$311
- plus $1K from 12 others
What the payments were for
- Food & beverage$5,419100%
- Education$150%
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 |
|---|---|---|
| GSK | 68 | $1,263 |
| Novartis | 68 | $1,159 |
| AstraZeneca | 49 | $870 |
| Optinose US, Inc. | 33 | $482 |
| Sanofi | 15 | $333 |
| Regeneron Healthcare Solutions, Inc. | 13 | $311 |
| Boehringer Ingelheim | 10 | $209 |
| Genentech USA, Inc. | 6 | $191 |
| Amgen(2 entities) | 7 | $168 |
| Kaleo, Inc. | 7 | $120 |
| Pfizer | 4 | $81 |
| Teva Pharmaceuticals USA, Inc. | 4 | $63 |
| Sanofi-aventis U.S. LLC | 3 | $46 |
| Incyte Corporation | 2 | $42 |
| Eyevance Pharmaceuticals LLC | 2 | $28 |
| Alk-abello, Inc | 2 | $28 |
| Phadia US Inc. | 1 | $19 |
| Hikma Pharmaceuticals USA | 1 | $19 |
How this compares
$5,434 in reported general payments places this provider in the 60th percentile of 161 allergy & immunology 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 |
|---|---|---|
| Montelukast Sodium | 57 | $864 |
| Albuterol Sulfate HfaAlbuterol Sulfate | 17 | $474 |
| Azelastine Hcl | 14 | $306 |
| Fluticasone Propionate | 13 | $262 |
Paid to pharmacies, not to this prescriber.
Other allergy & immunology in Elmhurst
- Zachary RubinElmhurst$133K
- Jeffrey KulikElmhurst$28K
- Dareen SiriNormal$5.9M
- Giselle MosnaimChicago$2.2M
- Anju PetersChicago$2.1M
- Priya BansalSaint Charles$1.3M
- Rachna ShahMelrose Park$1M
- Melanie MakhijaChicago$402K
- Elizabeth LippnerChicago$329K
- Patrick WinShiloh$314K
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.