Aiman Shammas, MD
Nephrology · Baltimore, MDNPI 1710184957
Payments from drug & device makers
Across 35 payments — averaging $22.27 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Amgen$157
- Bayer$98
- Vifor Pharma, Inc.$93
- AstraZeneca$82
- Mallinckrodt Hospital Products Inc.$66
- Nxstage Medical, Inc.$63
- plus $221 from 7 others
What the payments were for
- Food & beverage$75296%
- Education$274%
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 |
|---|---|---|
| Amgen(2 entities) | 6 | $157 |
| Bayer | 5 | $98 |
| Vifor Pharma, Inc. | 4 | $93 |
| AstraZeneca(2 entities) | 4 | $82 |
| Mallinckrodt Hospital Products Inc. | 2 | $66 |
| Nxstage Medical, Inc. | 1 | $63 |
| Otsuka America Pharmaceutical, Inc. | 3 | $55 |
| Akebia Therapeutics Inc | 3 | $51 |
| Calliditas Therapeutics US Inc. | 1 | $35 |
| Aurinia Pharma U.S., Inc. | 1 | $32 |
| Sanofi-aventis U.S. LLC | 1 | $25 |
| GSK | 1 | $16 |
| Travere Therapeutics, Inc. | 3 | $8 |
How this compares
$780 in reported general payments places this provider in the 50th percentile of 285 nephrology providers in Maryland.
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 |
|---|---|---|
| Sevelamer Carbonate | 39 | $9,710 |
| Calcitriol | 50 | $960 |
| Midodrine Hcl | 20 | $682 |
| Nifedipine ErNifedipine | 18 | $674 |
| Furosemide | 77 | $517 |
| Amlodipine Besylate | 60 | $472 |
| Losartan Potassium | 39 | $450 |
| Terazosin Hcl | 18 | $316 |
| Metoprolol Succinate | 15 | $285 |
| Lisinopril | 50 | $242 |
| Hydrochlorothiazide | 17 | $61 |
| Metoprolol Tartrate | 18 | $44 |
| Carvedilol | 13 | $16 |
Paid to pharmacies, not to this prescriber.
Other nephrology in Baltimore
- Christopher SperatiBaltimore$1.5M
- Michelle EstrellaBaltimore$1.2M
- Mohamed AttaBaltimore$1.1M
- Chirag ParikhBaltimore$1M
- Matthew WeirBaltimore$518K
- Duvuru GeethaBaltimore$409K
- Preeti ChandraBaltimore$287K
- Morgan GramsBaltimore$260K
- Mohamad HanounehBaltimore$174K
- Stephen SeligerBaltimore$134K
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.