Matthew Weir, MD
Nephrology · Baltimore, MDNPI 1316985237
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $322,733 of the $489,793 with a category attached, or 65.9%. It is spread thinly across 44 manufacturers, the largest accounting for just 19.1%. Reporting peaked in 2024 at $126,374 and has fallen 53.4% since, to $58,943 in 2025. Among nephrology clinicians in MD with any reported payments, this total sits in the top 5% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 444 payments — averaging $1103.14 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- AstraZeneca$93K
- Novo Nordisk$79K
- Bayer$52K
- Vifor (international) Ltd.$48K
- Seqirus USA Inc$36K
- Corcept Therapeutics$22K
- plus $159K from 38 others
Across 21 payments — averaging $1727.83 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.
- CSL Behring$29K
- Janssen Scientific Affairs, LLC$6K
- Amgen$1K
What the payments were for
- Consulting fees$322,73366%
- Speaking & faculty fees$79,51416%
- Grants$1,0000%
- Travel & lodging$71,82415%
- Food & beverage$14,7173%
- Education$40%
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.
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
$489,793 in reported general payments places this provider in the 95th 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 |
|---|---|---|
| VeltassaPatiromer Calcium Sorbitex | 15 | $31,796 |
| VelphoroSucroferric Oxyhydroxide | 12 | $25,053 |
| Cinacalcet Hcl | 57 | $16,463 |
| Sevelamer Carbonate | 40 | $11,076 |
| ProsolParenteral Amino Acid 20% No.1 | 52 | $9,320 |
| Calcium Acetate | 36 | $3,094 |
| Eplerenone | 15 | $2,585 |
| Doxazosin Mesylate | 106 | $2,317 |
| Ezetimibe | 19 | $1,425 |
| Labetalol Hcl | 17 | $1,298 |
| Rosuvastatin Calcium | 17 | $803 |
| Amlodipine Besylate | 134 | $720 |
| Tacrolimus | 16 | $691 |
| Atorvastatin Calcium | 58 | $628 |
| Nifedipine ErNifedipine | 31 | $522 |
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.
| Company | Paid to this provider | Part D cost of their drugs |
|---|---|---|
| Fresenius USA Marketing, Inc.Velphoro | $117 | $25,05312 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 95th percentile of 285 nephrology providers in Maryland.
Other nephrology in Baltimore
- Chirag ParikhBaltimore$186K
- Mohamad HanounehBaltimore$174K
- Daniel BrennanBaltimore$133K
- Monika DhillonBaltimore$126K
- Duvuru GeethaBaltimore$91K
- Mohamed AttaBaltimore$65K
- Michelle EstrellaBaltimore$55K
- Zainab ObaidiBaltimore$39K
- Christopher SperatiBaltimore$37K
- Charlotte Jones BurtonBaltimore$29K
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.