RxDoctor Payments Data

Tarun Marwaha, MD

Nephrology · Fountain Valley, CANPI 1407964976

Payments from drug & device makers

$1,695in general payments, 2019–2025

Across 26 payments — averaging $65.19 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.

  • Gastroklenz, Inc. DBA Cloudcath$456
  • Amgen$286
  • AstraZeneca$208
  • Bayer$142
  • Novo Nordisk$122
  • Ardelyx, Inc.$120
  • plus $361 from 7 others

What the payments were for

  • Speaking & faculty fees$40024%
  • Food & beverage$1,28176%
  • Education$141%

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

19
20
21
22
23
24
25

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.

CompanyPaymentsTotal
Gastroklenz, Inc. DBA Cloudcath2$456
Amgen(2 entities)5$286
AstraZeneca6$208
Bayer1$142
Novo Nordisk1$122
Ardelyx, Inc.1$120
GSK2$105
Nxstage Medical, Inc.2$75
Fresenius USA Marketing, Inc.2$73
Merz North America, Inc.1$37
Novartis1$30
Vifor Pharma, Inc.1$28
Calliditas Therapeutics US Inc.1$14

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

$1,695 in reported general payments places this provider in the 55th percentile of 1,341 nephrology providers in California.

See all nephrology providers in California

Medicare billing

Part B allowed, 2024
$496,051
Medicare patients
671
Services billed
5,066

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

DrugClaimsCost to plans & patients
KrystexxaPegloticase12$699,373
VelphoroSucroferric Oxyhydroxide25$96,121
Sevelamer Hcl16$30,071
AuryxiaFerric Citrate12$16,686
FarxigaDapagliflozin Propanediol14$11,572
LokelmaSodium Zirconium Cyclosilicate12$9,825
Sevelamer Carbonate33$4,449
Nifedipine ErNifedipine27$696
Calcitriol22$682
Hydralazine Hcl51$599
Mycophenolate Mofetil17$559
Pentoxifylline16$436
Minoxidil12$376
Sucralfate12$372
Potassium Chloride16$330

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.

CompanyPaid to this providerPart D cost of their drugs
AmgenKrystexxa$286$699,37312 claims
Fresenius USA Marketing, Inc.Velphoro$73$96,12125 claims
AstraZenecaFarxiga, Lokelma$208$21,39726 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 55th percentile of 1,341 nephrology providers in California.

Other nephrology in Fountain Valley

See the full list for California

Where these figures come from

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