Michael Hahn, MD
Neurological Surgery · Oklahoma City, OKNPI 1891784237
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $265,125 of the $267,327 with a category attached, or 99.2%. One Surgical, Inc. accounts for 99.2% of it on its own, with 8 other manufacturers making up the rest. Reporting peaked in 2020 at $135,042 and has fallen 99.4% since, to $760 in 2025. Among neurological surgery clinicians in OK with any reported payments, this total sits in the top 10% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 64 payments — averaging $4176.98 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- One Surgical, Inc.$265K
- Medtronic$2K
- Aesculap Implant Systems, LLC$118
- Orthofix Medical, Inc.$93
- Integra Lifesciences Corporation$40
- Baxter Healthcare$38
- plus $58 from 3 others
What the payments were for
- Consulting fees$265,12599%
- Food & beverage$2,1281%
- Education$740%
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 |
|---|---|---|
| One Surgical, Inc. | 2 | $265,125 |
| Medtronic(2 entities) | 53 | $1,856 |
| Aesculap Implant Systems, LLC | 1 | $118 |
| Orthofix Medical, Inc. | 1 | $93 |
| Integra Lifesciences Corporation | 2 | $40 |
| Baxter Healthcare | 2 | $38 |
| Globus Medical | 1 | $23 |
| Vertex | 1 | $19 |
| Monteris Medical Corporation | 1 | $15 |
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.
- ACTIVL ARTIFICIAL DISC$118
- NAVLOCK$109
How this compares
$267,327 in reported general payments places this provider in the 90th percentile of 80 neurological surgery providers in Oklahoma.
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 |
|---|---|---|
| Oxycodone-AcetaminophenOxycodone Hcl/Acetaminophen | 70 | $1,171 |
| Hydrocodone-AcetaminophenHydrocodone/Acetaminophen | 81 | $1,002 |
| Cyclobenzaprine Hcl | 84 | $618 |
| Tizanidine Hcl | 41 | $351 |
| Gabapentin | 18 | $187 |
| Oxycodone Hcl | 18 | $102 |
Paid to pharmacies, not to this prescriber.
Other neurological surgery in Oklahoma City
- Brian SnellOklahoma City$3.7M
- Fadi NasrOklahoma City$1.6M
- Robert TibbsOklahoma City$537K
- Isaac KarikariOklahoma City$137K
- Joseph CoxOklahoma City$123K
- Hakeem ShakirOklahoma City$63K
- Robert WieneckeOklahoma City$40K
- Muhammad JanjuaOklahoma City$33K
- Caple SpenceOklahoma City$31K
- Andrew ConnerOklahoma City$28K
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.