Payment overview · 2025
General Payments
We did not find matching Open Payments records for this doctor in the selected program year.
Healthcare provider profile · identity verified
Michael C Stark, DO
Family Practice · TOMAH, WI · NPI 1649260779
Verified facts
What the public records show
We did not find matching Open Payments records for this doctor in 2025.
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.
Analysis 1 · Payment-linked products
Products named in Open Payments records
No payment-linked product analysis is available because no matching General Payment records were found for the selected year.
Public prescribing for products named in payments
There is no explicit payment-product set available for a Part D comparison.
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.
There is no payer-company set available for this comparison.
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 |
|---|---|---|---|
| Atorvastatin Calcium | Atorvastatin Calcium | 458 | 98 |
| Omeprazole | Omeprazole | 272 | 50 |
| Gabapentin | Gabapentin | 240 | 46 |
| Metoprolol Succinate | Metoprolol Succinate | 238 | 65 |
| Pantoprazole Sodium | Pantoprazole Sodium | 213 | 44 |
| Lisinopril | Lisinopril | 206 | 44 |
| Tamsulosin Hcl | Tamsulosin Hcl | 199 | 39 |
| Furosemide | Furosemide | 194 | 47 |
| Levothyroxine Sodium | Levothyroxine Sodium | 191 | 40 |
| Amlodipine Besylate | Amlodipine Besylate | 162 | 38 |
| Eliquis | Apixaban | 147 | 23 |
| Simvastatin | Simvastatin | 141 | 39 |
| Losartan Potassium | Losartan Potassium | 139 | 36 |
| Metoprolol Tartrate | Metoprolol Tartrate | 134 | 32 |
| Hydrochlorothiazide | Hydrochlorothiazide | 124 | 37 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 118 | 32 |
| Metformin Hcl | Metformin Hcl | 113 | 24 |
| Sertraline Hcl | Sertraline Hcl | 101 | 18 |
| Trazodone Hcl | Trazodone Hcl | 99 | 20 |
| Famotidine | Famotidine | 95 | 19 |
| Potassium Chloride | Potassium Chloride | 94 | 26 |
| Warfarin Sodium | Warfarin Sodium | 90 | 19 |
| Clopidogrel | Clopidogrel Bisulfate | 87 | 18 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 81 | 28 |
| Finasteride | Finasteride | 79 | 14 |
| Allopurinol | Allopurinol | 78 | 17 |
| Alprazolam | Alprazolam | 74 | 16 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 72 | 17 |
| Metformin Hcl Er | Metformin Hcl | 69 | 15 |
| Jardiance | Empagliflozin | 68 | suppressed |
| Oxycodone Hcl | Oxycodone Hcl | 68 | 17 |
| Hydroxyzine Hcl | Hydroxyzine Hcl | 65 | 11 |
| Trulicity | Dulaglutide | 65 | 12 |
| Ozempic | Semaglutide | 64 | 12 |
| Alendronate Sodium | Alendronate Sodium | 61 | 18 |
| Ezetimibe | Ezetimibe | 60 | 11 |
| Lorazepam | Lorazepam | 57 | 17 |
| Fluticasone Propionate | Fluticasone Propionate | 56 | 23 |
| Humalog Kwikpen U-100 | Insulin Lispro | 56 | suppressed |
| Glimepiride | Glimepiride | 55 | 11 |
| Quetiapine Fumarate | Quetiapine Fumarate | 55 | suppressed |
| Fluoxetine Hcl | Fluoxetine Hcl | 53 | suppressed |
| Escitalopram Oxalate | Escitalopram Oxalate | 51 | suppressed |
| Cyclobenzaprine Hcl | Cyclobenzaprine Hcl | 49 | 23 |
| Levetiracetam | Levetiracetam | 49 | suppressed |
| Basaglar Kwikpen U-100 | Insulin Glargine,hum.Rec.Anlog | 47 | suppressed |
| Citalopram Hbr | Citalopram Hydrobromide | 47 | suppressed |
| Fluticasone-Salmeterol | Fluticasone Propion/Salmeterol | 47 | suppressed |
| Isosorbide Mononitrate Er | Isosorbide Mononitrate | 47 | suppressed |
| Mirtazapine | Mirtazapine | 47 | suppressed |
| Breo Ellipta | Fluticasone/Vilanterol | 44 | suppressed |
| Oxycodone-Acetaminophen | Oxycodone Hcl/Acetaminophen | 44 | suppressed |
| Combivent Respimat | Ipratropium/Albuterol Sulfate | 43 | suppressed |
| Tizanidine Hcl | Tizanidine Hcl | 43 | suppressed |
| Lantus Solostar | Insulin Glargine,hum.Rec.Anlog | 42 | suppressed |
| Spironolactone | Spironolactone | 42 | suppressed |
| Topiramate | Topiramate | 42 | suppressed |
| Zolpidem Tartrate | Zolpidem Tartrate | 42 | suppressed |
| Nitroglycerin | Nitroglycerin | 41 | 28 |
| Lisinopril-Hydrochlorothiazide | Lisinopril/Hydrochlorothiazide | 40 | 13 |
| Pravastatin Sodium | Pravastatin Sodium | 40 | 12 |
| Baclofen | Baclofen | 39 | suppressed |
| Memantine Hcl | Memantine Hcl | 39 | suppressed |
| Montelukast Sodium | Montelukast Sodium | 39 | suppressed |
| Tramadol Hcl | Tramadol Hcl | 39 | 12 |
| Oxybutynin Chloride Er | Oxybutynin Chloride | 38 | suppressed |
| Ondansetron Odt | Ondansetron | 37 | suppressed |
| Carvedilol | Carvedilol | 35 | suppressed |
| Clonazepam | Clonazepam | 35 | suppressed |
| Chlorthalidone | Chlorthalidone | 33 | suppressed |
| Xarelto | Rivaroxaban | 31 | suppressed |
| Triamcinolone Acetonide | Triamcinolone Acetonide | 30 | 15 |
| Autoshield Duo Pen Needle | Pen Needle,dual Safety,diabetc | 29 | suppressed |
| Buspirone Hcl | Buspirone Hcl | 29 | suppressed |
| Duloxetine Hcl | Duloxetine Hcl | 28 | suppressed |
| Divalproex Sodium | Divalproex Sodium | 27 | suppressed |
| Donepezil Hcl | Donepezil Hcl | 27 | suppressed |
| Ibuprofen | Ibuprofen | 27 | suppressed |
| Benztropine Mesylate | Benztropine Mesylate | 26 | suppressed |
| Diclofenac Sodium | Diclofenac Sodium | 26 | 16 |
| Atenolol | Atenolol | 25 | suppressed |
| Divalproex Sodium Er | Divalproex Sodium | 25 | suppressed |
| Ramipril | Ramipril | 25 | suppressed |
| Nystatin | Nystatin | 24 | suppressed |
| Semglee (Yfgn) Pen | Insulin Glargine-Yfgn | 24 | suppressed |
| Torsemide | Torsemide | 24 | suppressed |
| Brimonidine Tartrate | Brimonidine Tartrate | 23 | suppressed |
| Fluphenazine Decanoate | Fluphenazine Decanoate | 23 | suppressed |
| Glipizide | Glipizide | 23 | suppressed |
| Propranolol Hcl | Propranolol Hcl | 23 | suppressed |
| Admelog Solostar | Insulin Lispro | 22 | suppressed |
| Carbidopa-Levodopa | Carbidopa/Levodopa | 22 | suppressed |
| Morphine Sulfate Er | Morphine Sulfate | 22 | suppressed |
| Bisoprolol Fumarate | Bisoprolol Fumarate | 21 | suppressed |
| Cefdinir | Cefdinir | 21 | 17 |
| Lovastatin | Lovastatin | 21 | suppressed |
| Nano 2nd Gen Pen Needle | Pen Needle, Diabetic | 21 | suppressed |
| Valsartan | Valsartan | 21 | suppressed |
| Amitriptyline Hcl | Amitriptyline Hcl | 20 | suppressed |
| Amoxicillin | Amoxicillin | 20 | 14 |
| Latanoprost | Latanoprost | 20 | suppressed |
| Ventolin Hfa | Albuterol Sulfate | 20 | suppressed |
| Polymyxin B Sul-Trimethoprim | Polymyxin B Sulf/Trimethoprim | 19 | suppressed |
| Pramipexole Dihydrochloride | Pramipexole Di-Hcl | 19 | suppressed |
| Olanzapine | Olanzapine | 18 | suppressed |
| Oxybutynin Chloride | Oxybutynin Chloride | 18 | suppressed |
| Pregabalin | Pregabalin | 18 | suppressed |
| Venlafaxine Hcl Er | Venlafaxine Hcl | 18 | suppressed |
| Glipizide Er | Glipizide | 17 | suppressed |
| Lamotrigine | Lamotrigine | 17 | suppressed |
| Celecoxib | Celecoxib | 16 | suppressed |
| Ammonium Lactate | Ammonium Lactate | 15 | suppressed |
| Diazepam | Diazepam | 15 | suppressed |
| Entresto | Sacubitril/Valsartan | 15 | suppressed |
| Humulin N Kwikpen | Insulin Nph Human Isophane | 15 | suppressed |
| Invega Sustenna | Paliperidone Palmitate | 15 | suppressed |
| Nortriptyline Hcl | Nortriptyline Hcl | 15 | suppressed |
| Nystop | Nystatin | 15 | suppressed |
| Risperidone | Risperidone | 15 | suppressed |
| Imipramine Hcl | Imipramine Hcl | 14 | suppressed |
| Ketoconazole | Ketoconazole | 14 | suppressed |
| Prednisone | Prednisone | 14 | 13 |
| Tolterodine Tartrate Er | Tolterodine Tartrate | 14 | suppressed |
| Calcium Acetate | Calcium Acetate | 13 | suppressed |
| Diltiazem 24hr Er (Cd) | Diltiazem Hcl | 13 | suppressed |
| Fluconazole | Fluconazole | 13 | suppressed |
| Lamotrigine Er | Lamotrigine | 13 | suppressed |
| Methocarbamol | Methocarbamol | 13 | suppressed |
| Morphine Sulfate | Morphine Sulfate | 13 | suppressed |
| Spiriva Handihaler | Tiotropium Bromide | 13 | suppressed |
| Tradjenta | Linagliptin | 13 | suppressed |
| Amoxicillin-Clavulanate Potass | Amoxicillin/Potassium Clav | 12 | suppressed |
| Atomoxetine Hcl | Atomoxetine Hcl | 12 | suppressed |
| Azithromycin | Azithromycin | 12 | 12 |
| Nexium | Esomeprazole Magnesium | 12 | suppressed |
| Nitrofurantoin Mono-Macro | Nitrofurantoin Monohyd/M-Cryst | 12 | suppressed |
| Ondansetron Hcl | Ondansetron Hcl | 12 | suppressed |
| Aripiprazole | Aripiprazole | 11 | suppressed |
| Meloxicam | Meloxicam | 11 | suppressed |
| Spiriva Respimat | Tiotropium Bromide | 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 | — | — | — | — | — |
| 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