Christina Lankhorst, MD
Nephrology · Sioux Falls, SDNPI 1134336340
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 94.1% of the total across 64 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. It is spread thinly across 25 manufacturers, the largest accounting for just 17.8% — the pattern of someone who eats at a lot of different presentations. Among nephrology clinicians in SD 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 64 payments — averaging $19.84 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- AstraZeneca$226
- Travere Therapeutics, Inc.$103
- Novartis$100
- Mallinckrodt Hospital Products Inc.$86
- Fresenius USA Marketing, Inc.$71
- Amgen$66
- plus $617 from 19 others
What the payments were for
- Food & beverage$1,19594%
- Education$756%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
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 |
|---|---|---|
| AstraZeneca(2 entities) | 12 | $226 |
| Travere Therapeutics, Inc. | 5 | $103 |
| Novartis | 4 | $100 |
| Mallinckrodt Hospital Products Inc. | 2 | $86 |
| Fresenius USA Marketing, Inc. | 4 | $71 |
| Amgen(2 entities) | 4 | $66 |
| Mallinckrodt Enterprises LLC | 3 | $61 |
| Scpharmaceuticals Inc. | 2 | $60 |
| Calliditas Therapeutics US Inc. | 2 | $58 |
| Otsuka America Pharmaceutical, Inc. | 3 | $55 |
| Daiichi Sankyo Inc. | 3 | $46 |
| Ardelyx, Inc. | 2 | $35 |
| OPKO Pharmaceuticals, LLC | 3 | $35 |
| Vifor Pharma, Inc. | 2 | $32 |
| Sanofi | 2 | $29 |
| Medtronic | 1 | $29 |
| Bayer | 1 | $27 |
| Vantive US Healthcare LLC | 1 | $23 |
| Shire North American Group Inc | 2 | $23 |
| Boehringer Ingelheim | 1 | $22 |
| Baxter Healthcare | 1 | $20 |
| Nxstage Medical, Inc. | 1 | $19 |
| Novo Nordisk | 1 | $17 |
| Pfizer | 1 | $16 |
| Veloxis Pharmaceuticals, Inc. | 1 | $12 |
How this compares
$1,270 in reported general payments places this provider in the 95th percentile of 26 nephrology providers in South Dakota.
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 |
|---|---|---|
| Sevelamer Carbonate | 28 | $3,177 |
| Calcium Acetate | 38 | $2,762 |
| Potassium Citrate ErPotassium Citrate | 24 | $1,663 |
| Calcitriol | 69 | $1,127 |
| Potassium Chloride | 26 | $767 |
| Allopurinol | 54 | $578 |
| Amlodipine Besylate | 59 | $558 |
| Furosemide | 71 | $422 |
| Hydralazine Hcl | 23 | $381 |
| Tamsulosin Hcl | 33 | $354 |
| Torsemide | 16 | $330 |
| Losartan Potassium | 45 | $324 |
| Doxazosin Mesylate | 20 | $301 |
| Prednisone | 26 | $209 |
| Diltiazem 24hr Er (Cd)Diltiazem Hcl | 12 | $203 |
Paid to pharmacies, not to this prescriber.
Other nephrology in Sioux Falls
- Ismail OmranSioux Falls$1K
- Arvin SantosSioux Falls$868
- Erin GreerSioux Falls$748
- Mohammad QamarSioux Falls$574
- Anthony RuppSioux Falls$496
- Dana BrandysSioux Falls$457
- David KovaleskiSioux Falls$247
- Jeremy AworiSioux Falls$203
- Tina MelansonSioux Falls$158
- Lu HuberSioux Falls$133
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.