John Keller, MD
Neurological Surgery · Grand Rapids, MINPI 1770664583
Payments from drug & device makers
What this record shows
The money is spread across several categories — speaking fees (39.1%), royalties or licence payments and food and beverage — rather than concentrated in one kind of arrangement. Medtronic accounts for 63.6% of it on its own, with 12 other manufacturers making up the rest. Reporting peaked in 2020 at $17,545 and has fallen 65.1% since, to $6,124 in 2025.
Across 907 payments — averaging $63.98 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Medtronic$37K
- Cutting Edge Spine, LLC$15K
- Surgalign Spine Technologies, Inc.$4K
- Centinel Spine, LLC$1K
- Augmedics Inc.$593
- Carlsmed, Inc.$170
- plus $383 from 7 others
Across 13 payments — averaging $78,069 each. An ownership or investment interest held by the physician or an immediate family member.
- Happe Spine$780K
- Augmedics Inc.$235K
What the payments were for
- Royalty or licence$14,53425%
- Consulting fees$7,24012%
- Speaking & faculty fees$22,69039%
- Travel & lodging$1,5443%
- Food & beverage$12,02321%
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 |
|---|---|---|
| Medtronic(2 entities) | 879 | $36,898 |
| Cutting Edge Spine, LLC | 4 | $14,534 |
| Surgalign Spine Technologies, Inc. | 5 | $4,150 |
| Centinel Spine, LLC | 5 | $1,302 |
| Augmedics Inc. | 4 | $593 |
| Carlsmed, Inc. | 1 | $170 |
| Intrinsic Therapeutics | 1 | $146 |
| Spineology Inc. | 2 | $77 |
| Xtant Medical Inc | 2 | $48 |
| Bioventus LLC | 1 | $32 |
| Baxter Healthcare | 1 | $28 |
| Abbott | 1 | $27 |
| Merck | 1 | $24 |
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.
- MazorX - Renaissance$10,955
- MAZOR X SYSTEM$7,848
- coflex$4,050
- Xvision$2,966
- Mazor X Stealth Edition$2,571
- PRODISC C VIVO$920
- O-ARM-Spine$421
- BARRICAID ACD (ANNULAR CLOSURE DEVICE)$293
- PRODISC C$195
- INTELLIS$176
- aprevo$170
- PIVOX Oblique Lateral Spinal System$157
- PRODISC L$152
- O-ARM-ST$142
- DIVERGENCE$142
How this compares
$58,031 in reported general payments places this provider in the 85th percentile of 256 neurological surgery 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 |
|---|---|---|
| Nabumetone | 23 | $361 |
| Celecoxib | 18 | $182 |
| Methylprednisolone | 21 | $131 |
| Cephalexin | 13 | $93 |
| Methocarbamol | 20 | $90 |
| Mupirocin | 12 | $78 |
Paid to pharmacies, not to this prescriber.
Other neurological surgery in Grand Rapids
- Justin SingerGrand Rapids$944K
- Justin ClarkGrand Rapids$83K
- Paul MazarisGrand Rapids$63K
- Luyuan LiGrand Rapids$59K
- Sanjay PatraGrand Rapids$43K
- Bryan FigueroaGrand Rapids$35K
- Travis HamiltonGrand Rapids$25K
- Konstantin ElisevichGrand Rapids$24K
- Todd VogelGrand Rapids$15K
- Moises GoogeGrand Rapids$14K
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.