Payment overview · 2025
General Payments
$8,716.54
19 reported records · 8 companies
Healthcare provider profile · identity verified
Louis Weimer, M.D.
Allopathic & Osteopathic Physicians|Psychiatry & Neurology|Neurology · NEW YORK, NY · NPI 1356357404
Verified facts
What the public records show
CMS Open Payments records show Louis Weimer, M.D. received $8,716.54 in general payments during 2025 across 19 reported records.
F. Hoffmann-La Roche AG accounted for 95.0% of that reported general-payment amount.
The Open Payments records used for this analysis explicitly named 7 associated products.
A separate comparison found the same explicitly named product in public Medicare Part D data: Firdapse, Gamunex-C.
CATALYST PHARMACEUTICALS, INC. reported payments to this doctor in 2025. Across the 2025 Open Payments General Payment records loaded for this analysis, that same reporting entity reported FIRDAPSE as an associated drug or biological on 1474 records involving 920 distinct recipient NPIs. Public Medicare Part D data also shows 13 claims for Firdapse by this doctor in 2024.
Grifols USA, LLC reported payments to this doctor in 2025. Across the 2025 Open Payments General Payment records loaded for this analysis, that same reporting entity reported Gamunex-C as an associated drug or biological on 3977 records involving 2134 distinct recipient NPIs. Public Medicare Part D data also shows 30 claims for Gamunex-C by this doctor in 2024.
Takeda Pharmaceuticals U.S.A., Inc. reported payments to this doctor in 2025. Across the 2025 Open Payments General Payment records loaded for this analysis, that same reporting entity reported GAMMAGARD LIQUID as an associated drug or biological on 29 records involving 8 distinct recipient NPIs. Public Medicare Part D data also shows 39 claims for Gammagard Liquid by this doctor in 2024.
These records do not establish that a payment influenced prescribing or medical care.
Separate record types
Research & Ownership
Research Payments (direct recipient): not present in the loaded data
Associated Research Funding (for example, named PI): not present in the loaded data
Ownership / Investment: not present in the loaded data
These categories are never added into the General Payments headline. Associated research funding must not be described as money the doctor personally received unless the source record supports that conclusion.
Who paid this doctor?
Companies in 2025 General Payments
| Reported company | Canonical company | Amount | Share | Records | Year |
|---|---|---|---|---|---|
| F. Hoffmann-La Roche AG | Unresolved — no canonical attribution shown | $8,280.00 | 95.0% | 4 | 2025 |
| Alexion Pharmaceuticals, Inc. | Unresolved — no canonical attribution shown | $152.93 | 1.8% | 5 | 2025 |
| CATALYST PHARMACEUTICALS, INC. | Unresolved — no canonical attribution shown | $78.21 | 0.9% | 2 | 2025 |
| ARGENX US, INC. | Unresolved — no canonical attribution shown | $74.04 | 0.8% | 3 | 2025 |
| AstraZeneca Pharmaceuticals LP | Unresolved — no canonical attribution shown | $47.62 | 0.6% | 2 | 2025 |
| Janssen Biotech, Inc. | Unresolved — no canonical attribution shown | $36.72 | 0.4% | 1 | 2025 |
| Grifols USA, LLC | Unresolved — no canonical attribution shown | $24.58 | 0.3% | 1 | 2025 |
| Takeda Pharmaceuticals U.S.A., Inc. | Unresolved — no canonical attribution shown | $22.44 | 0.3% | 1 | 2025 |
What were the payments for?
Payment categories
| Category | Amount | Records |
|---|---|---|
| Consulting Fee | $8,280.00 | 4 |
| Food and Beverage | $436.54 | 15 |
A meal, consulting fee, royalty, and travel payment describe different kinds of reported relationships and should not be interpreted as equivalent.
Analysis 1 · Payment-linked products
Products named in Open Payments records
| Reported product | Type | Reported company | Related amount* | Records | Year |
|---|---|---|---|---|---|
| Evrysdi Normalized: evrysdi |
Drug | F. Hoffmann-La Roche AG | $8,280.00 | 4 | 2025 |
Source payment records
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| ULTOMIRIS Normalized: ultomiris |
Biological | Alexion Pharmaceuticals, Inc. | $152.93 | 5 | 2025 |
Source payment records
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| FIRDAPSE Normalized: firdapse |
Drug | CATALYST PHARMACEUTICALS, INC. | $78.21 | 2 | 2025 |
Source payment records
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| VYVGART HYTRULO Normalized: vyvgart hytrulo |
Drug | ARGENX US, INC. | $74.04 | 3 | 2025 |
Source payment records
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| WAINUA Normalized: wainua |
Drug | AstraZeneca Pharmaceuticals LP | $47.62 | 2 | 2025 |
Source payment records
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| Gamunex-C Normalized: gamunex c |
Biological | Grifols USA, LLC | $24.58 | 1 | 2025 |
Source payment records
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| HYQVIA Normalized: hyqvia |
Biological | Takeda Pharmaceuticals U.S.A., Inc. | $22.44 | 1 | 2025 |
Source payment records
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* Product-associated amounts are non-additive because one payment record may name more than one product.
These products were named on specific Open Payments records. A named product does not show that the payment influenced treatment or prescribing.
Public prescribing for products named in payments
| Open Payments product | Payment year | Part D brand | Part D year | Claims | Match method | Source |
|---|---|---|---|---|---|---|
| FIRDAPSE firdapse |
2025 | Firdapse | 2024 | 13 Beneficiary count suppressed |
exact normalized | Medicare Part D |
| Gamunex-C gamunex c |
2025 | Gamunex-C | 2024 | 30 Beneficiary count suppressed |
exact normalized | Medicare Part D |
The presence of the same drug in both datasets does not show that a payment caused or influenced a prescription.
Analysis 2 · Same-company prescribing overlap
Drugs reported in other payments from the same company that also appear in Medicare Part D
This analysis is independent from products named on this doctor’s individual payment records. A row appears only when the exact Open Payments reporting entity paid this doctor, that same reporting entity reported the drug or biological on at least 10 loaded General Payment records involving at least 2 distinct recipient NPIs, and this doctor has the same non-generic brand in public Part D data. This does not mean the company owns or manufactures the drug.
| Paying company | Payment year | Drug reported by same entity | Open Payments evidence | Part D | Claims | Beneficiaries |
|---|---|---|---|---|---|---|
| CATALYST PHARMACEUTICALS, INC. Exact reporting entity; no affiliate inference |
2025 | FIRDAPSE open payments reported associated product |
CMS Open Payments — General Payments 1474 supporting records · 920 recipient NPIs · example record 1253216494 |
Firdapse · 2024 Exact normalized brand match · 1 Part D row |
13 | suppressed by CMS |
| Grifols USA, LLC Exact reporting entity; no affiliate inference |
2025 | Gamunex-C open payments reported associated product |
CMS Open Payments — General Payments 3977 supporting records · 2134 recipient NPIs · example record 1249529381 |
Gamunex-C · 2024 Exact normalized brand match · 1 Part D row |
30 | suppressed by CMS |
| Takeda Pharmaceuticals U.S.A., Inc. Exact reporting entity; no affiliate inference |
2025 | GAMMAGARD LIQUID open payments reported associated product |
CMS Open Payments — General Payments 29 supporting records · 8 recipient NPIs · example record 1223786557 |
Gammagard Liquid · 2024 Exact normalized brand match · 1 Part D row |
39 | suppressed by CMS |
These facts do not show that a payment was for the drug, that the company owns or manufactures the drug, or that a payment caused or influenced prescribing.
Public Medicare Part D data
Provider-and-drug rows loaded for 2024
| Brand | Generic | Claims | Beneficiaries |
|---|---|---|---|
| Pyridostigmine Bromide | Pyridostigmine Bromide | 136 | 38 |
| Gabapentin | Gabapentin | 62 | 18 |
| Gammagard Liquid | Immun Glob G(Igg)/Gly/Iga Ov50 | 39 | suppressed |
| Gamunex-C | Immune Globul G/Gly/Iga Avg 46 | 30 | suppressed |
| Duloxetine Hcl | Duloxetine Hcl | 28 | suppressed |
| Midodrine Hcl | Midodrine Hcl | 27 | 11 |
| Prednisone | Prednisone | 24 | suppressed |
| Fludrocortisone Acetate | Fludrocortisone Acetate | 23 | suppressed |
| Droxidopa | Droxidopa | 21 | suppressed |
| Gammaked | Immune Globul G/Gly/Iga Avg 46 | 18 | suppressed |
| Sodium Chloride | 0.9 % Sodium Chloride | 16 | suppressed |
| Firdapse | Amifampridine Phosphate | 13 | suppressed |
| Nortriptyline Hcl | Nortriptyline Hcl | 12 | suppressed |
| Tramadol Hcl | Tramadol Hcl | 11 | suppressed |
Timeline
Payment and prescribing data by year
Open Payments and Medicare Part D may refer to different years. They are shown separately rather than aligned as if they describe the same period.
| Year | General Payments | Main payer | Explicit products | Company overlaps | Part D coverage |
|---|---|---|---|---|---|
| 2025 | $8,716.54 · 19 records | F. Hoffmann-La Roche AG | Evrysdi, FIRDAPSE, Gamunex-C, HYQVIA, ULTOMIRIS, VYVGART HYTRULO, WAINUA | 3 | — |
| 2024 | — | — | — | — | Complete |
Questions to ask
Questions you could discuss with your doctor
- What role, if any, does Firdapse play in your treatment recommendations for me?
- How do you evaluate evidence when you have a financial relationship with CATALYST PHARMACEUTICALS, INC.?
- Are there reasonable alternatives I should understand when we discuss treatment options?
- How should I interpret the industry-payment records shown here in the context of my care?
These are general questions generated from reviewed templates. They are not personalized medical advice.
Sources and limitations
How to read this page
- Payment and Medicare prescribing data can cover different years; every comparison shows both years explicitly.
- Part D does not represent a doctor’s entire practice; it excludes many patients and is subject to CMS public-release thresholds.
- Company–drug relationships must have an auditable source, a precise relationship type, and a valid evidence period. Unresolved mappings are not published.
- Generic drug claims are not attributed to a specific manufacturer without manufacturer-level evidence.
- When a source extract is incomplete, missing rows are never treated as proof of no payments or no prescriptions.
Loaded source releases
| Dataset | Year | Publication | Source |
|---|---|---|---|
| CMS Open Payments — General Payments | 2025 | 2026-06-30 | Original source |
| Medicare Part D Prescribers by Provider and Drug | 2024 | 2026-05-06 | Original source |
| NPPES Data Dissemination V2 | current / reference data | 2026-08-10 | Original source |
Full methodology · Questions & answers · Report a possible error