Corydon Siffring, MD
Surgical Critical Care · Escanaba, MINPI 1891728887
Payments from drug & device makers
What this record shows
The money is spread across several categories — travel and lodging (56.8%), food and beverage and consulting fees — rather than concentrated in one kind of arrangement. Zimmer Biomet accounts for 75.5% of it on its own, with 8 other manufacturers making up the rest. Reporting peaked in 2019 at $850 and has fallen 91.2% since, to $75 in 2025. That places this record below the midpoint for surgical critical care clinicians in MI, where the typical reported total is $2,699.
Across 15 payments — averaging $91.83 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Zimmer Biomet$1K
- Ambu Inc.$109
- CLR Medical, Inc.$75
- Prytime Medical Devices, Inc.$42
- Z-medica, LLC$35
- Medtronic$29
- plus $48 from 3 others
What the payments were for
- Consulting fees$353%
- Travel & lodging$78357%
- Food & beverage$56041%
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 |
|---|---|---|
| Zimmer Biomet | 7 | $1,039 |
| Ambu Inc. | 1 | $109 |
| CLR Medical, Inc. | 1 | $75 |
| Prytime Medical Devices, Inc. | 1 | $42 |
| Z-medica, LLC | 1 | $35 |
| Medtronic | 1 | $29 |
| Johnson & Johnson | 1 | $22 |
| Intuitive Surgical | 1 | $14 |
| Shire North American Group Inc | 1 | $12 |
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.
- RibFix Blu$714
- CMF & Thoracic-None$259
How this compares
$1,377 in reported general payments places this provider in the 35th percentile of 70 surgical critical care 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.
Other surgical critical care in Escanaba
- Lena NapolitanoAnn Arbor$119K
- Robert SawyerKalamazoo$31K
- John SharpeSaginaw$30K
- Jamal FarhanFlint$27K
- Gregory CerilliYpsilanti$26K
- Lindsey RieckPontiac$19K
- Matthew DullGrand Rapids$16K
- Alistair ChapmanGrand Rapids$15K
- Jenna OverlyTroy$14K
- Douglas KwazneskiGrand Rapids$12K
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.