Kristen Tillquist, DO
Nephrology · Riverside, RINPI 1033774559
Payments from drug & device makers
What this record shows
The money is spread across several categories — consulting fees (54.7%), food and beverage and education — rather than concentrated in one kind of arrangement. Calliditas Therapeutics US Inc. accounts for 65.3% of it on its own, with 8 other manufacturers making up the rest. 2025 is the largest year on record at $1,930, more than ten times the $23 reported in 2020.
Across 21 payments — averaging $117.60 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Calliditas Therapeutics US Inc.$2K
- Bayer$211
- AstraZeneca$206
- Otsuka Pharmaceutical Development & Commercialization, Inc.$167
- Novartis$118
- GSK$103
- plus $52 from 3 others
What the payments were for
- Consulting fees$1,35055%
- Food & beverage$1,11045%
- Education$100%
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 |
|---|---|---|
| Calliditas Therapeutics US Inc. | 4 | $1,613 |
| Bayer | 2 | $211 |
| AstraZeneca(2 entities) | 3 | $206 |
| Otsuka Pharmaceutical Development & Commercialization, Inc. | 2 | $167 |
| Novartis | 1 | $118 |
| GSK | 1 | $103 |
| Novo Nordisk | 1 | $23 |
| Nxstage Medical, Inc. | 1 | $19 |
| Travere Therapeutics, Inc. | 6 | $10 |
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.
How this compares
$2,470 in reported general payments places this provider in the 65th percentile of 45 nephrology providers in Rhode Island.
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 |
|---|---|---|
| ProsolParenteral Amino Acid 20% No.1 | 12 | $2,883 |
Paid to pharmacies, not to this prescriber.
Other nephrology in Riverside
- Reginald GohhRiverside$47K
- Ankur ShahRiverside$27K
- Jie TangRiverside$23K
- Douglas SheminRiverside$22K
- Basma MerhiRiverside$2K
- John ObellRiverside$2K
- Sandipan ShringiRiverside$1K
- George BaylissRiverside$246
- Susie HuRiverside$205
- Matthew LynchRiverside$180
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.