Siddhartha Kattamanchi, MD
Nephrology · Marshfield, WINPI 1316388382
Payments from drug & device makers
What this record shows
3 manufacturers reported payments, led by Travere Therapeutics, Inc. at 52.3% of the total. 2022 is the largest year on record at $123, 7.4 times the $17 reported in 2019. That places this record below the midpoint for nephrology clinicians in WI, where the typical reported total is $267.
Across 3 payments — averaging $78.31 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Travere Therapeutics, Inc.$123
- Otsuka America Pharmaceutical, Inc.$96
- Otsuka Pharmaceutical Development & Commercialization, Inc.$17
Across 154 payments — averaging $1307.60 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.
- Travere Therapeutics, Inc.$128K
- Boehringer Ingelheim$42K
- Novartis$28K
- Boehringer Ingelheim International GmbH$3K
What the payments were for
- Food & beverage$12352%
- Education$11248%
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 |
|---|---|---|
| Travere Therapeutics, Inc. | 1 | $123 |
| Otsuka America Pharmaceutical, Inc. | 1 | $96 |
| Otsuka Pharmaceutical Development & Commercialization, Inc. | 1 | $17 |
How this compares
$235 in reported general payments places this provider in the 45th percentile of 173 nephrology providers in Wisconsin.
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 |
|---|---|---|
| JynarqueTolvaptan | 13 | $251,027 |
| JardianceEmpagliflozin | 11 | $5,831 |
| TazicefCeftazidime | 25 | $484 |
| Ceftazidime | 21 | $453 |
| Enalapril Maleate | 11 | $414 |
| Calcitriol | 32 | $283 |
| Furosemide | 35 | $257 |
| Amlodipine Besylate | 49 | $238 |
| Losartan Potassium | 43 | $216 |
| Lisinopril | 21 | $139 |
| Spironolactone | 15 | $128 |
| Prednisone | 21 | $91 |
Paid to pharmacies, not to this prescriber.
Companies that both paid and supply prescribed drugs
These companies both reported payments to this provider and make drugs the provider prescribed under Medicare Part D in 2024. For most specialties this overlap is expected — a cardiologist who is paid by a cardiology drugmaker also treats heart disease. It is shown so the reader can see it, not because it implies anything on its own.
| Company | Paid to this provider | Part D cost of their drugs |
|---|---|---|
| Otsuka America Pharmaceutical, Inc.Jynarque | $96 | $251,02713 claims |
Reading this fairly. The Part D column is what drug plans and patients paid pharmacies — this provider received none of it, and it reflects how many patients they treat and what those drugs cost. Against peers, this provider's reported payments sit in the 45th percentile of 173 nephrology providers in Wisconsin.
Other nephrology in Marshfield
- Narayana MuraliMarshfield$7K
- Kevin RegnerMilwaukee$246K
- Rosanna RanieriKenosha$84K
- Micah ChanFitchburg$80K
- Rishi KoraGlendale$57K
- Manohar AhujaMilwaukee$35K
- Ashraf El MeanawyMilwaukee$30K
- Anna GaddyMilwaukee$28K
- Sameer GuptaFond du Lac$20K
- Paul HannaMilwaukee$18K
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.