Chao-Huang Sun
Nephrology · Riverside, CANPI 1134174493
Payments from drug & device makers
What this record shows
Astrazeneca UK Limited accounts for 74.4% of it on its own, with 7 other manufacturers making up the rest. Reporting peaked in 2020 at $1,216 and has fallen 86.3% since, to $167 in 2022.
Across 23 payments — averaging $70.10 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Astrazeneca UK Limited$1K
- Travere Therapeutics, Inc.$149
- AstraZeneca$90
- Amgen$82
- Akebia Therapeutics Inc$39
- Vifor Pharma, Inc.$25
- plus $28 from 2 others
Across 222 payments — averaging $2043.14 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.
- Akebia Therapeutics Inc$204K
- GSK$147K
- Astrazeneca AB$65K
- Baxter Healthcare$15K
- Gilead$8K
- Boehringer Ingelheim$6K
- plus $10K from 5 others
What the payments were for
- Travel & lodging$88855%
- Food & beverage$72445%
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 UK Limited | 7 | $1,199 |
| Travere Therapeutics, Inc. | 1 | $149 |
| AstraZeneca | 6 | $90 |
| Amgen(2 entities) | 4 | $82 |
| Akebia Therapeutics Inc | 2 | $39 |
| Vifor Pharma, Inc. | 1 | $25 |
| Genentech USA, Inc. | 1 | $16 |
| Fresenius USA Marketing, Inc. | 1 | $12 |
How this compares
$1,612 in reported general payments places this provider in the 55th percentile of 1,341 nephrology providers in California.
Other nephrology in Riverside
- Anjay RastogiLos Angeles$2.2M
- Glenn ChertowStanford$2M
- Luis AlvarezPalo Alto$1.8M
- Jose MorfinSacramento$1M
- Rodolfo BatarseRancho Mirage$910K
- Vandana MathurWoodside$769K
- Yasir QaziOrange$618K
- Rafael VillicanaLoma Linda$610K
- Sunil PatelApple Valley$509K
- Suphamai BunnapradistLos Angeles$498K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.