Daniel Brennan, MD
Nephrology · Baltimore, MDNPI 1023036597
Payments from drug & device makers
What this record shows
The money is spread across several categories — speaking fees (45.3%), consulting fees and travel and lodging — rather than concentrated in one kind of arrangement. Sanofi-aventis U.S. LLC accounts for 73.2% of it on its own, with 11 other manufacturers making up the rest. Reporting peaked in 2024 at $53,882 and has fallen 69.2% since, to $16,599 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 79 payments — averaging $1687.70 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Sanofi-aventis U.S. LLC$98K
- Veloxis Pharmaceuticals, Inc.$10K
- AstraZeneca$7K
- Calliditas Therapeutics US Inc.$5K
- Sanofi US Services Inc.$3K
- Takeda Pharmaceuticals U.S.A., Inc.$3K
- plus $7K from 6 others
Across 1 payment — averaging $244.20 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.
- Sanofi-aventis U.S. LLC$244
What the payments were for
- Consulting fees$49,83637%
- Speaking & faculty fees$60,40945%
- Travel & lodging$21,25416%
- Food & beverage$1,8141%
- Education$150%
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 |
|---|---|---|
| Sanofi-aventis U.S. LLC | 36 | $97,606 |
| Veloxis Pharmaceuticals, Inc. | 13 | $10,079 |
| AstraZeneca | 3 | $7,080 |
| Calliditas Therapeutics US Inc. | 7 | $5,106 |
| Sanofi US Services Inc. | 1 | $3,412 |
| Takeda Pharmaceuticals U.S.A., Inc. | 3 | $3,221 |
| Roche Diagnostics Corporation | 1 | $2,900 |
| Kamada Ltd. | 1 | $2,295 |
| Travere Therapeutics, Inc. | 10 | $1,521 |
| Mallinckrodt Hospital Products Inc. | 2 | $53 |
| Astellas Pharma US Inc | 1 | $30 |
| ANI Pharmaceuticals, Inc. | 1 | $26 |
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.
- THYMOGLOBULIN$81,008
- Envarsus$9,880
- ULTOMIRIS$7,080
- TARPEYO$4,875
- MD cobas Instruments and Reagents$2,900
- Cytogam$2,295
How this compares
$133,328 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 |
|---|---|---|
| Envarsus XrTacrolimus | 17 | $13,996 |
| FarxigaDapagliflozin Propanediol | 20 | $13,489 |
| JardianceEmpagliflozin | 12 | $7,358 |
| Tacrolimus | 24 | $5,077 |
| Mycophenolate Mofetil | 23 | $1,326 |
| Atorvastatin Calcium | 115 | $1,221 |
| Nifedipine ErNifedipine | 37 | $1,164 |
| Prednisone | 143 | $817 |
| Amlodipine Besylate | 54 | $541 |
| Hydralazine Hcl | 11 | $480 |
| Tamsulosin Hcl | 45 | $421 |
| Irbesartan | 25 | $384 |
| Carvedilol | 57 | $366 |
| Losartan Potassium | 48 | $350 |
| Rosuvastatin Calcium | 19 | $324 |
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 |
|---|---|---|
| AstraZenecaFarxiga | $7,080 | $13,48920 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
- Matthew WeirBaltimore$490K
- Chirag ParikhBaltimore$186K
- Mohamad HanounehBaltimore$174K
- 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.