Payment overview · 2025
General Payments
$23.72
1 reported records · 1 companies
Healthcare provider profile · identity verified
William Kellar Winkelmeyer, M.D.
Allopathic & Osteopathic Physicians|Internal Medicine|Nephrology · COLUMBIA, MO · NPI 1316943475
Verified facts
What the public records show
CMS Open Payments records show William Kellar Winkelmeyer, M.D. received $23.72 in general payments during 2025 across 1 reported records.
Amgen Inc. accounted for 100.0% of that reported general-payment amount.
The Open Payments records used for this analysis explicitly named 1 associated product.
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 | $23.72 | 100.0% | 1 | 2025 |
What were the payments for?
Payment categories
| Category | Amount | Records |
|---|---|---|
| Food and Beverage | $23.72 | 1 |
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 |
|---|---|---|---|---|---|
| TAVNEOS Normalized: tavneos |
Drug | Amgen Inc. | $23.72 | 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
No exact normalized or approved-alias overlap was found in the loaded Part D year. This does not mean the doctor never prescribed the product.
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.
No publishable same-company prescribing overlap was found in the loaded Part D year. This does not mean the doctor never prescribed a drug reported elsewhere by a paying company.
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 |
|---|---|---|---|
| Torsemide | Torsemide | 919 | 224 |
| Amlodipine Besylate | Amlodipine Besylate | 600 | 155 |
| Losartan Potassium | Losartan Potassium | 473 | 120 |
| Atorvastatin Calcium | Atorvastatin Calcium | 462 | 120 |
| Lisinopril | Lisinopril | 354 | 97 |
| Indapamide | Indapamide | 244 | 65 |
| Allopurinol | Allopurinol | 239 | 59 |
| Metformin Hcl | Metformin Hcl | 164 | 45 |
| Nifedipine Er | Nifedipine | 154 | 31 |
| Levothyroxine Sodium | Levothyroxine Sodium | 147 | 36 |
| Gabapentin | Gabapentin | 133 | 28 |
| Metoprolol Succinate | Metoprolol Succinate | 133 | 37 |
| Omeprazole | Omeprazole | 128 | 32 |
| Doxazosin Mesylate | Doxazosin Mesylate | 120 | 31 |
| Spironolactone | Spironolactone | 117 | 34 |
| Clonidine Hcl | Clonidine Hcl | 104 | 34 |
| Nebivolol Hcl | Nebivolol Hcl | 87 | 22 |
| Potassium Chloride | Potassium Chloride | 83 | 20 |
| Carvedilol | Carvedilol | 80 | 19 |
| Tramadol Hcl | Tramadol Hcl | 80 | 12 |
| Pantoprazole Sodium | Pantoprazole Sodium | 79 | 19 |
| Furosemide | Furosemide | 78 | 26 |
| Calcium Acetate | Calcium Acetate | 67 | 13 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 62 | 18 |
| Escitalopram Oxalate | Escitalopram Oxalate | 59 | 11 |
| Metoprolol Tartrate | Metoprolol Tartrate | 53 | 12 |
| Midodrine Hcl | Midodrine Hcl | 51 | suppressed |
| Olmesartan Medoxomil | Olmesartan Medoxomil | 50 | 12 |
| Sevelamer Carbonate | Sevelamer Carbonate | 45 | suppressed |
| Bisoprolol Fumarate | Bisoprolol Fumarate | 43 | 15 |
| Fluticasone Propionate | Fluticasone Propionate | 43 | suppressed |
| Glipizide | Glipizide | 43 | 11 |
| Labetalol Hcl | Labetalol Hcl | 43 | suppressed |
| Tamsulosin Hcl | Tamsulosin Hcl | 42 | 14 |
| Irbesartan | Irbesartan | 40 | suppressed |
| Hydrochlorothiazide | Hydrochlorothiazide | 39 | 14 |
| Lantus Solostar | Insulin Glargine,hum.Rec.Anlog | 39 | suppressed |
| Finasteride | Finasteride | 38 | suppressed |
| Lisinopril-Hydrochlorothiazide | Lisinopril/Hydrochlorothiazide | 36 | suppressed |
| Trazodone Hcl | Trazodone Hcl | 35 | suppressed |
| Zolpidem Tartrate | Zolpidem Tartrate | 35 | suppressed |
| Clopidogrel | Clopidogrel Bisulfate | 34 | suppressed |
| Jardiance | Empagliflozin | 34 | suppressed |
| Metformin Hcl Er | Metformin Hcl | 34 | suppressed |
| Eliquis | Apixaban | 32 | suppressed |
| Sertraline Hcl | Sertraline Hcl | 29 | suppressed |
| Ezetimibe | Ezetimibe | 28 | suppressed |
| Valsartan-Hydrochlorothiazide | Valsartan/Hydrochlorothiazide | 28 | suppressed |
| Farxiga | Dapagliflozin Propanediol | 27 | suppressed |
| Losartan-Hydrochlorothiazide | Losartan/Hydrochlorothiazide | 27 | suppressed |
| Prednisone | Prednisone | 26 | 12 |
| Montelukast Sodium | Montelukast Sodium | 25 | suppressed |
| Benazepril Hcl | Benazepril Hcl | 24 | suppressed |
| Chlorthalidone | Chlorthalidone | 24 | suppressed |
| Celecoxib | Celecoxib | 23 | suppressed |
| Colchicine | Colchicine | 23 | suppressed |
| Cyclobenzaprine Hcl | Cyclobenzaprine Hcl | 23 | suppressed |
| Duloxetine Hcl | Duloxetine Hcl | 23 | suppressed |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 23 | suppressed |
| Cephalexin | Cephalexin | 22 | suppressed |
| Diltiazem 24hr Er (Cd) | Diltiazem Hcl | 22 | suppressed |
| Febuxostat | Febuxostat | 22 | suppressed |
| Diazepam | Diazepam | 21 | suppressed |
| Bumetanide | Bumetanide | 20 | suppressed |
| Fenofibrate | Fenofibrate Nanocrystallized | 20 | suppressed |
| Famotidine | Famotidine | 19 | suppressed |
| Sulfamethoxazole-Trimethoprim | Sulfamethoxazole/Trimethoprim | 19 | suppressed |
| Citalopram Hbr | Citalopram Hydrobromide | 18 | suppressed |
| Januvia | Sitagliptin Phosphate | 18 | suppressed |
| Minoxidil | Minoxidil | 18 | suppressed |
| Ondansetron Hcl | Ondansetron Hcl | 18 | suppressed |
| Synthroid | Levothyroxine Sodium | 18 | suppressed |
| Alprazolam | Alprazolam | 17 | suppressed |
| Glimepiride | Glimepiride | 17 | suppressed |
| Kerendia | Finerenone | 17 | suppressed |
| Linzess | Linaclotide | 17 | suppressed |
| Pramipexole Dihydrochloride | Pramipexole Di-Hcl | 17 | suppressed |
| Glipizide Er | Glipizide | 16 | suppressed |
| Hydralazine Hcl | Hydralazine Hcl | 16 | suppressed |
| Simvastatin | Simvastatin | 16 | suppressed |
| Isosorbide Mononitrate Er | Isosorbide Mononitrate | 15 | suppressed |
| Lovastatin | Lovastatin | 15 | suppressed |
| Quetiapine Fumarate | Quetiapine Fumarate | 15 | suppressed |
| Velphoro | Sucroferric Oxyhydroxide | 15 | suppressed |
| Oxybutynin Chloride | Oxybutynin Chloride | 14 | suppressed |
| Valsartan | Valsartan | 14 | suppressed |
| Humulin 70/30 Kwikpen | Insulin Nph Hum/Reg Insulin Hm | 13 | suppressed |
| Metoclopramide Hcl | Metoclopramide Hcl | 13 | suppressed |
| Novolog Flexpen | Insulin Aspart | 13 | suppressed |
| Azithromycin | Azithromycin | 12 | suppressed |
| Digoxin | Digoxin | 12 | suppressed |
| Liothyronine Sodium | Liothyronine Sodium | 12 | suppressed |
| Mounjaro | Tirzepatide | 12 | suppressed |
| Pioglitazone Hcl | Pioglitazone Hcl | 12 | suppressed |
| Propranolol Hcl | Propranolol Hcl | 12 | suppressed |
| Lokelma | Sodium Zirconium Cyclosilicate | 11 | suppressed |
| Nadolol | Nadolol | 11 | suppressed |
| Ropinirole Hcl | Ropinirole Hcl | 11 | suppressed |
| Sumatriptan | Sumatriptan | 11 | suppressed |
| Ultra-Fine Short Pen Needle | Pen Needle, Diabetic | 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 | $23.72 · 1 records | Amgen Inc. | TAVNEOS | — | — |
| 2024 | — | — | — | — | Complete |
Questions to ask
Questions you could discuss with your doctor
- 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