Matthew Knabel, DPM
Foot & Ankle Surgery · Boston, MANPI 1417489667
Payments from drug & device makers
What this record shows
This record is dominated by education: $2,400 of the $3,010 with a category attached, or 79.7%. Kairos Surgical Inc accounts for 80.7% of it on its own, with 5 other manufacturers making up the rest. Reporting peaked in 2021 at $1,554 and has fallen 90.9% since, to $142 in 2025.
Across 20 payments — averaging $150.52 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Kairos Surgical Inc$2K
- Stryker$385
- Convatec Inc.$142
- Orthofix Medical, Inc.$25
- Bioventus LLC$18
- Smith+Nephew$12
What the payments were for
- Food & beverage$61020%
- Education$2,40080%
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 |
|---|---|---|
| Kairos Surgical Inc | 4 | $2,429 |
| Stryker(2 entities) | 9 | $385 |
| Convatec Inc. | 4 | $142 |
| Orthofix Medical, Inc. | 1 | $25 |
| Bioventus LLC | 1 | $18 |
| Smith+Nephew | 1 | $12 |
How this compares
$3,010 in reported general payments places this provider in the 60th percentile of 122 foot & ankle surgery providers in Massachusetts.
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 |
|---|---|---|
| Diclofenac Sodium | 115 | $1,791 |
| Ciclopirox | 69 | $1,494 |
| Clotrimazole | 65 | $1,159 |
| Ammonium Lactate | 53 | $624 |
| Doxycycline Monohydrate | 15 | $174 |
| Meloxicam | 75 | $161 |
| Methylprednisolone | 14 | $75 |
| Oxycodone Hcl | 14 | $43 |
Paid to pharmacies, not to this prescriber.
Other foot & ankle surgery in Boston
- Jaeyoung KimBoston$14K
- Kevin RiemerBoston$5K
- Machli AdrienBoston$3K
- Yong ChoBoston$2K
- Harry SchneiderCambridge$174K
- Craig LareauSpringfield$115K
- David SipalaBrighton$94K
- Philip BasileCambridge$90K
- Michael SgangaNatick$90K
- Joseph FleckNorth Chelmsford$35K
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.