Nathan Hamaker, MD
Ophthalmology · Blue Springs, MONPI 1104852292
Payments from drug & device makers
Across 7 payments — averaging $28.03 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Ocular Therapeutix, Inc.$81
- Oyster Point Pharma, Inc.$63
- Bausch & Lomb Americas Inc.$20
- Novartis$17
- Alcon$15
What the payments were for
- Food & beverage$196100%
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 |
|---|---|---|
| Ocular Therapeutix, Inc. | 1 | $81 |
| Oyster Point Pharma, Inc. | 3 | $63 |
| Bausch & Lomb Americas Inc. | 1 | $20 |
| Novartis | 1 | $17 |
| Alcon | 1 | $15 |
How this compares
$196 in reported general payments places this provider in the 15th percentile of 286 ophthalmology providers in Missouri.
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 |
|---|---|---|
| LumiganBimatoprost | 63 | $34,435 |
| Latanoprost | 1,331 | $13,464 |
| Cyclosporine | 12 | $12,794 |
| Travoprost | 122 | $11,603 |
| CombiganBrimonidine Tartrate/Timolol | 22 | $10,227 |
| Brimonidine Tartrate-TimololBrimonidine Tartrate/Timolol | 52 | $8,674 |
| Neomycin-Polymyxin-DexamethNeomycin/Polymyxin B/Dexametha | 228 | $4,833 |
| Dorzolamide-TimololDorzolamide Hcl/Timolol Maleat | 306 | $4,165 |
| Prednisolone Acetate | 71 | $2,901 |
| Tobramycin-DexamethasoneTobramycin/Dexamethasone | 33 | $2,769 |
| Brimonidine Tartrate | 102 | $2,415 |
| Timolol Maleate | 213 | $1,573 |
| Dorzolamide Hcl | 47 | $1,024 |
| ValacyclovirValacyclovir Hcl | 23 | $704 |
| Ketorolac Tromethamine | 25 | $473 |
Paid to pharmacies, not to this prescriber.
Other ophthalmology in Blue Springs
- Nancy HolekampChesterfield$2.7M
- Steven SilversteinKansas City$1.6M
- Joseph TauberKansas City$1.3M
- Steven CouchSaint Louis$1.2M
- Andrew MoyesKansas City$1.1M
- Ranjan MalhotraSaint Louis$964K
- Navin TekwaniSaint Louis$957K
- Joseph GiraDes Peres$926K
- Michael KorenfeldWashington$821K
- Gregg BerdySaint Louis$740K
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.