Shannon Dieffenderfer
Physician Assistant · Anchorage, AKNPI 1861048530
Payments from drug & device makers
What this record shows
This record is dominated by travel and lodging: $7,042 of the $11,037 with a category attached, or 63.8%. Medtronic accounts for 84.3% of it on its own, with 11 other manufacturers making up the rest. Reporting peaked in 2023 at $6,988 and has fallen 96.0% since, to $278 in 2025. Among physician assistant clinicians in AK with any reported payments, this total sits in the top 5% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 79 payments — averaging $139.71 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Medtronic$9K
- Alaska Medical Technologies, LLC$559
- Stryker$261
- Johnson & Johnson$246
- KCI USA, Inc.$140
- Solventum Corporation$105
- plus $425 from 6 others
What the payments were for
- Travel & lodging$7,04264%
- Food & beverage$3,99536%
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 | 58 | $9,302 |
| Alaska Medical Technologies, LLC | 2 | $559 |
| Stryker | 4 | $261 |
| Johnson & Johnson(2 entities) | 4 | $246 |
| KCI USA, Inc. | 2 | $140 |
| Solventum Corporation | 2 | $105 |
| Globus Medical | 1 | $99 |
| Si-bone, Inc. | 1 | $93 |
| Medical Device Business Services, Inc. | 1 | $83 |
| Smith+Nephew | 2 | $76 |
| Orthofix Medical, Inc. | 1 | $62 |
| Heron Therapeutics, 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.
- CD HORIZON SPINAL SYSTEM$3,351
- MAZOR X SYSTEM$3,194
- PIVOX Oblique Lateral Spinal System$1,247
- T2 ALPHA$111
How this compares
$11,037 in reported general payments places this provider in the 95th percentile of 365 physician assistant providers in Alaska.
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 |
|---|---|---|
| Gabapentin | 48 | $281 |
| Cyclobenzaprine Hcl | 36 | $142 |
| Alendronate Sodium | 12 | $139 |
| Oxycodone Hcl | 47 | $74 |
| Meloxicam | 20 | $29 |
Paid to pharmacies, not to this prescriber.
Other physician assistant in Anchorage
- Jeremy RosieckiAnchorage$93K
- Ivy ParayoAnchorage$12K
- Zach ZipsirAnchorage$8K
- Tara WoodAnchorage$8K
- Madison RosinAnchorage$7K
- Pamela TittleAnchorage$7K
- Pamela HaughomAnchorage$7K
- Joshua HedbergAnchorage$6K
- Jo KohlerAnchorage$5K
- Brittany SedlacekAnchorage$5K
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.