Mark Vandewalker, MD
Allergy · Columbia, MONPI 1386833358
Payments from drug & device makers
Across 580 payments — averaging $5097.71 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- AstraZeneca$1.4M
- Teva Pharmaceuticals USA, Inc.$512K
- Cipla USA Inc.$293K
- Hikma Pharmaceuticals USA$219K
- Chiesi USA, Inc.$195K
- GSK$172K
- plus $166K from 24 others
Across 11 payments — averaging $328.00 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.
- Chiesi USA, Inc.$2K
- GSK$1K
- Teva Pharmaceuticals USA, Inc.$477
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 |
|---|---|---|
| AstraZeneca | 105 | $1,398,823 |
| Teva Pharmaceuticals USA, Inc. | 105 | $511,919 |
| Cipla USA Inc. | 61 | $293,320 |
| Hikma Pharmaceuticals USA | 13 | $219,247 |
| Chiesi USA, Inc. | 68 | $195,484 |
| GSK | 100 | $171,743 |
| Novartis | 28 | $148,900 |
| Boehringer Ingelheim | 15 | $6,134 |
| Sunovion Pharmaceuticals Inc. | 15 | $4,687 |
| Astrazeneca UK Limited | 1 | $4,537 |
| Sanofi | 18 | $399 |
| Genentech USA, Inc. | 13 | $301 |
| Merck | 4 | $300 |
| Grifols USA, LLC | 9 | $259 |
| Regeneron Healthcare Solutions, Inc. | 5 | $108 |
| Greer Laboratories, Inc. | 1 | $96 |
| Takeda Pharmaceuticals U.S.A., Inc. | 3 | $74 |
| Sanofi-aventis U.S. LLC | 1 | $55 |
| Alk-abello, Inc | 1 | $50 |
| ARS Pharmaceuticals Operations, Inc. | 2 | $36 |
| Aimmune Therapeutics, Inc. | 2 | $35 |
| Pharming Healthcare, Inc. | 2 | $28 |
| Verona Pharma, Inc. | 1 | $21 |
| Biocryst US Sales Co., LLC | 1 | $20 |
| Pfizer | 1 | $18 |
| Amgen | 1 | $17 |
| Octapharma USA, Inc. | 1 | $16 |
| AbbVie | 1 | $15 |
| Regeneron | 1 | $15 |
| Optinose US, Inc. | 1 | $15 |
How this compares
Too few allergy providers in Missourito 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.
Other allergy in Columbia
- William StrickerColumbia$4K
- Robert OnderSaint Louis$5.4M
- Sanchayita TripathyRolla$629K
- Lawrence LandwehrWarrensburg$316K
- Maria SabioKirkwood$15K
- Silvia HuebnerSpringfield$14K
- Josie VitaleSaint Louis$10K
- Jeffrey WrightSaint Louis$7K
- Laura EssweinSaint Louis$6K
- Douglas BersonChesterfield$929
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.