Gregory Grenier, DO
Orthopaedic Surgery · Billings, MTNPI 1134512593
Payments from drug & device makers
What this record shows
This record is dominated by education: $6,794 of the $9,801 with a category attached, or 69.3%. 13 manufacturers reported payments, led by Arthrex at 24.8% of the total. Reporting peaked in 2021 at $4,836 and has fallen 95.9% since, to $197 in 2025.
Across 39 payments — averaging $251.30 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Arthrex$2K
- CDC Medical LLC$2K
- Medinc Of Texas$2K
- Sioux Surgical Inc$1K
- Gemini Mountain Medical, LLC$860
- Smith+Nephew$229
- plus $684 from 7 others
What the payments were for
- Travel & lodging$1,77718%
- Food & beverage$1,22913%
- Education$6,79469%
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 |
|---|---|---|
| Arthrex | 17 | $2,433 |
| CDC Medical LLC | 1 | $2,281 |
| Medinc Of Texas | 2 | $2,113 |
| Sioux Surgical Inc | 1 | $1,200 |
| Gemini Mountain Medical, LLC | 3 | $860 |
| Smith+Nephew | 2 | $229 |
| Stryker | 2 | $157 |
| Alliance Medical | 4 | $135 |
| Kerecis Limited | 1 | $132 |
| Bioventus LLC | 1 | $110 |
| Biotissue Holdings Inc. | 3 | $102 |
| Exactech, Inc. | 1 | $32 |
| Organogenesis Inc. | 1 | $16 |
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
$9,801 in reported general payments places this provider in the 80th percentile of 76 orthopaedic surgery providers in Montana.
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 |
|---|---|---|
| Cephalexin | 18 | $138 |
| Methylprednisolone | 14 | $113 |
| Hydrocodone-AcetaminophenHydrocodone/Acetaminophen | 15 | $90 |
| Methocarbamol | 16 | $50 |
Paid to pharmacies, not to this prescriber.
Other orthopaedic surgery in Billings
- Brian DrakeBillings$84K
- Matthew KopplinBillings$35K
- Steven KleppsBillings$16K
- Julia QuirionBillings$12K
- Zachary ScheerBillings$6K
- Kyle LybrandBillings$4K
- James ElliottBillings$4K
- Heather HansenBillings$2K
- Alan DacreBillings$2K
- Gregory McDowellBillings$685
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.