Nicholas Hartog, MD
Allergy & Immunology · Grand Rapids, MINPI 1669766325
Payments from drug & device makers
What this record shows
This record is dominated by speaking fees: $371,355 of the $575,153 with a category attached, or 64.6%. 29 manufacturers reported payments, led by Amgen at 40.4% of the total. Among allergy & immunology clinicians in MI with any reported payments, this total sits in the top 5% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 791 payments — averaging $727.12 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Amgen$232K
- Pharming Healthcare, Inc.$166K
- 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 2 payments — averaging $4468.75 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.$9K
What the payments were for
- Consulting fees$137,83124%
- Speaking & faculty fees$371,35565%
- Travel & lodging$53,4509%
- Food & beverage$12,3512%
- Education$1660%
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. | 247 | $165,748 |
| 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 |
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
$575,153 in reported general payments places this provider in the 95th 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.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| ActimmuneInterferon Gamma-1b,recomb. | 11 | $1,459,113 |
| Dupixent SyringeDupilumab | 21 | $74,559 |
| XolairOmalizumab | 11 | $28,544 |
| Trelegy ElliptaFluticasone/Umeclidin/Vilanter | 14 | $8,225 |
| Albuterol Sulfate HfaAlbuterol Sulfate | 28 | $1,545 |
| Azelastine Hcl | 27 | $984 |
| Ipratropium Bromide | 18 | $744 |
| Montelukast Sodium | 51 | $709 |
| Fluticasone Propionate | 24 | $440 |
| Sulfamethoxazole-TrimethoprimSulfamethoxazole/Trimethoprim | 18 | $351 |
| Azithromycin | 12 | $312 |
| Amoxicillin-Clavulanate PotassAmoxicillin/Potassium Clav | 11 | $259 |
| Prednisone | 17 | $94 |
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 |
|---|---|---|
| AmgenActimmune | $232,153 | $1,459,11311 claims |
| Genentech, Inc.Xolair | $36 | $28,54411 claims |
| GSKTrelegy Ellipta | $432 | $8,22514 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 95th percentile of 119 allergy & immunology providers in Michigan.
Other allergy & immunology in Grand Rapids
- Theodore KelbelGrand Rapids$695K
- Thomas MillerGrand Rapids$7K
- Vincent DubravecGrand Rapids$4K
- Bradley BoelkinsGrand Rapids$3K
- Amanda HolsworthGrand Rapids$2K
- Steven StrykCanton$949K
- Hassan NasirWest Branch$736K
- Kathleen DassOak Park$446K
- Pulin PatelMount Clemens$431K
- Alan BaptistAnn Arbor$168K
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.