Essam Mostafa, MD
Nephrology · Fountain Valley, CANPI 1316932270
Payments from drug & device makers
Across 19 payments — averaging $20.81 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Boehringer Ingelheim$351
- GSK$31
- Calliditas Therapeutics US Inc.$14
What the payments were for
- Food & beverage$38297%
- Education$143%
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 |
|---|---|---|
| Boehringer Ingelheim | 17 | $351 |
| GSK | 1 | $31 |
| Calliditas Therapeutics US Inc. | 1 | $14 |
How this compares
$395 in reported general payments places this provider in the 30th percentile of 1,341 nephrology providers in California.
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 |
|---|---|---|
| VelphoroSucroferric Oxyhydroxide | 23 | $41,128 |
| ProsolParenteral Amino Acid 20% No.1 | 41 | $6,356 |
| Sevelamer Carbonate | 23 | $4,535 |
| SpsSodium Polystyrene Sulfon/Sorb | 11 | $1,432 |
| Sodium Polystyrene Sulfonate | 17 | $760 |
| Calcium Acetate | 11 | $681 |
| Midodrine Hcl | 16 | $564 |
| Hydralazine Hcl | 44 | $462 |
| Bumetanide | 24 | $340 |
| Calcitriol | 38 | $214 |
| Furosemide | 48 | $206 |
| Amlodipine Besylate | 33 | $178 |
| Clonidine Hcl | 28 | $164 |
| Potassium Chloride | 13 | $75 |
Paid to pharmacies, not to this prescriber.
Other nephrology in Fountain Valley
- Alan CantillepFountain Valley$1.5M
- Anjay RastogiLos Angeles$6.3M
- Aamir JamalSan Dimas$5.5M
- Mohamed El-ShahawyLos Angeles$4.4M
- Kalpesh PatelCalabasas$3.6M
- Jehad HaggiagiMission Hills$3.6M
- Malvin YanSouth Gate$3.3M
- Sohan DuaNorthridge$3.2M
- Richard LafayetteStanford$3M
- Anant DesaiGranada Hills$2.9M
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.