Payment overview · 2025
General Payments
$638.74
19 reported records · 7 companies
Healthcare provider profile · identity verified
William L Weiss, MD, PC
Allopathic & Osteopathic Physicians|Internal Medicine|Nephrology · PHOENIX, AZ · NPI 1881686368
Verified facts
What the public records show
CMS Open Payments records show William L Weiss, MD, PC received $638.74 in general payments during 2025 across 19 reported records.
Amgen Inc. accounted for 26.9% 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: Veltassa.
AKEBIA THERAPEUTICS 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 Auryxia as an associated drug or biological on 494 records involving 327 distinct recipient NPIs. Public Medicare Part D data also shows 13 claims for Auryxia by this doctor in 2024.
Vifor Pharma, 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 Veltassa as an associated drug or biological on 5970 records involving 2480 distinct recipient NPIs. Public Medicare Part D data also shows 113 claims for Veltassa 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 |
|---|---|---|---|---|---|
| Amgen Inc. | Unresolved — no canonical attribution shown | $171.52 | 26.9% | 8 | 2025 |
| Calliditas Therapeutics US Inc. | Unresolved — no canonical attribution shown | $124.99 | 19.6% | 1 | 2025 |
| AKEBIA THERAPEUTICS INC | Unresolved — no canonical attribution shown | $121.75 | 19.1% | 1 | 2025 |
| Daiichi Sankyo Inc. | Unresolved — no canonical attribution shown | $73.85 | 11.6% | 3 | 2025 |
| Novartis Pharmaceuticals Corporation | Unresolved — no canonical attribution shown | $64.90 | 10.2% | 3 | 2025 |
| Vifor Pharma, Inc. | Unresolved — no canonical attribution shown | $56.00 | 8.8% | 2 | 2025 |
| Otsuka Pharmaceutical Development & Commercialization, Inc. | Unresolved — no canonical attribution shown | $25.73 | 4.0% | 1 | 2025 |
What were the payments for?
Payment categories
| Category | Amount | Records |
|---|---|---|
| Food and Beverage | $638.74 | 19 |
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 |
|---|---|---|---|---|---|
| TARPEYO Normalized: tarpeyo |
Drug | Calliditas Therapeutics US Inc. | $124.99 | 1 | 2025 |
Source payment records
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| KRYSTEXXA Normalized: krystexxa |
Biological | Amgen Inc. | $124.08 | 5 | 2025 |
Source payment records
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| Vafseo Normalized: vafseo |
Drug | AKEBIA THERAPEUTICS INC | $121.75 | 1 | 2025 |
Source payment records
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| INJECTAFER Normalized: injectafer |
Drug | Daiichi Sankyo Inc. | $73.85 | 3 | 2025 |
Source payment records
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| Fabhalta Normalized: fabhalta |
Drug | Novartis Pharmaceuticals Corporation | $64.90 | 3 | 2025 |
Source payment records
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| Veltassa Normalized: veltassa |
Drug | Vifor Pharma, Inc. | $56.00 | 2 | 2025 |
Source payment records
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| TAVNEOS Normalized: tavneos |
Drug | Amgen Inc. | $47.44 | 3 | 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 |
|---|---|---|---|---|---|---|
| Veltassa veltassa |
2025 | Veltassa | 2024 | 113 | 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 |
|---|---|---|---|---|---|---|
| AKEBIA THERAPEUTICS INC Exact reporting entity; no affiliate inference |
2025 | Auryxia open payments reported associated product |
CMS Open Payments — General Payments 494 supporting records · 327 recipient NPIs · example record 1241812131 |
Auryxia · 2024 Exact normalized brand match · 1 Part D row |
13 | suppressed by CMS |
| Vifor Pharma, Inc. Exact reporting entity; no affiliate inference |
2025 | Veltassa open payments reported associated product |
CMS Open Payments — General Payments 5970 supporting records · 2480 recipient NPIs · example record 1172020739 |
Veltassa · 2024 Exact normalized brand match · 1 Part D row |
113 | 26 |
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 |
|---|---|---|---|
| Furosemide | Furosemide | 250 | 81 |
| Amlodipine Besylate | Amlodipine Besylate | 237 | 73 |
| Losartan Potassium | Losartan Potassium | 223 | 74 |
| Calcitriol | Calcitriol | 169 | 48 |
| Veltassa | Patiromer Calcium Sorbitex | 113 | 26 |
| Allopurinol | Allopurinol | 104 | 29 |
| Lisinopril | Lisinopril | 102 | 31 |
| Spironolactone | Spironolactone | 89 | 30 |
| Carvedilol | Carvedilol | 74 | 22 |
| Hydralazine Hcl | Hydralazine Hcl | 66 | 26 |
| Lokelma | Sodium Zirconium Cyclosilicate | 63 | 19 |
| Nifedipine Er | Nifedipine | 63 | 23 |
| Labetalol Hcl | Labetalol Hcl | 58 | 12 |
| Ciprofloxacin Hcl | Ciprofloxacin Hcl | 57 | 40 |
| Plenamine | Parenteral Amino Acid 15% No.6 | 43 | suppressed |
| Sevelamer Carbonate | Sevelamer Carbonate | 41 | 14 |
| Farxiga | Dapagliflozin Propanediol | 36 | 11 |
| Metoprolol Tartrate | Metoprolol Tartrate | 31 | 12 |
| Potassium Chloride | Potassium Chloride | 29 | 13 |
| Gabapentin | Gabapentin | 27 | suppressed |
| Omeprazole | Omeprazole | 23 | suppressed |
| Metoprolol Succinate | Metoprolol Succinate | 22 | suppressed |
| Metolazone | Metolazone | 18 | suppressed |
| Bumetanide | Bumetanide | 17 | suppressed |
| Ramipril | Ramipril | 17 | suppressed |
| Famotidine | Famotidine | 16 | suppressed |
| Prednisone | Prednisone | 16 | suppressed |
| Vitamin D2 | Ergocalciferol (Vitamin D2) | 16 | suppressed |
| Lidocaine-Prilocaine | Lidocaine/Prilocaine | 15 | suppressed |
| Tamsulosin Hcl | Tamsulosin Hcl | 15 | suppressed |
| Auryxia | Ferric Citrate | 13 | suppressed |
| Azithromycin | Azithromycin | 12 | suppressed |
| Fluconazole | Fluconazole | 12 | 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 | $638.74 · 19 records | Amgen Inc. | Fabhalta, INJECTAFER, KRYSTEXXA, TARPEYO, TAVNEOS, Vafseo, Veltassa | 2 | — |
| 2024 | — | — | — | — | Complete |
Questions to ask
Questions you could discuss with your doctor
- What role, if any, does Veltassa play in your treatment recommendations for me?
- How do you evaluate evidence when you have a financial relationship with AKEBIA THERAPEUTICS 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