Nicholas Hartog, MD
Allergy & Immunology · Grand Rapids, MINPI 1669766325
Payments from drug & device makers
Across 792 payments — averaging $734.00 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Amgen$232K
- Pharming Healthcare, Inc.$172K
- Takeda Pharmaceuticals U.S.A., Inc.$131K
- Chiesi USA, Inc.$13K
- ADMA Biomanufacturing LLC$9K
- Shire North American Group Inc$9K
- plus $16K from 23 others
Across 1 payment — averaging $2762.50 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.
- Pharming Healthcare, Inc.$3K
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 |
|---|---|---|
| Amgen(2 entities) | 231 | $232,153 |
| Pharming Healthcare, Inc. | 248 | $171,923 |
| Takeda Pharmaceuticals U.S.A., Inc. | 179 | $131,240 |
| Chiesi USA, Inc. | 4 | $12,834 |
| ADMA Biomanufacturing LLC | 10 | $8,537 |
| Shire North American Group Inc | 13 | $8,523 |
| X4 Pharmaceuticals, Inc. | 4 | $5,221 |
| The Binding Site Inc. | 3 | $3,705 |
| Regeneron Healthcare Solutions, Inc. | 15 | $2,437 |
| Genentech USA, Inc. | 4 | $1,813 |
| AstraZeneca | 10 | $667 |
| GSK | 16 | $432 |
| Sobi, Inc | 4 | $407 |
| Grifols USA, LLC | 8 | $246 |
| Sanofi | 5 | $233 |
| CSL Behring | 8 | $203 |
| Pfizer | 8 | $160 |
| Novartis | 6 | $124 |
| Grifols Shared Services North America, Inc. | 1 | $112 |
| ARS Pharmaceuticals Operations, Inc. | 3 | $77 |
| E.r. Squibb & Sons, L.L.C. | 2 | $60 |
| Alk-abello, Inc | 3 | $54 |
| Sumitomo Pharma America, Inc. | 1 | $50 |
| Genentech, Inc. | 1 | $36 |
| Blueprint Medicines Corporation | 1 | $25 |
| Kaleo, Inc. | 1 | $16 |
| Vapotherm Inc | 1 | $16 |
| Lilly USA, LLC | 1 | $16 |
| Bio Products Laboratory USA, Inc. | 1 | $8 |
How this compares
$581,328 in reported general payments places this provider in the 90th percentile of 119 allergy & immunology providers in Michigan.
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 & immunology in Grand Rapids
- Theodore KelbelGrand Rapids$695K
- Thomas MillerGrand Rapids$7K
- Vincent DubravecGrand Rapids$4K
- Bradley BoelkinsGrand Rapids$3K
- Jeffrey LefleinYpsilanti$7.9M
- Cem AkinNorthville$3M
- Alan BaptistAnn Arbor$2.5M
- Suresh AnneFlint$1.1M
- Steven StrykCanton$949K
- Hassan NasirWest Branch$736K
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.