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
William Barker, D.O.
Family Practice · CHESTERFIELD, MI · NPI 1275554073
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 |
|---|---|---|---|
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 267 | 49 |
| Omeprazole | Omeprazole | 234 | 74 |
| Levothyroxine Sodium | Levothyroxine Sodium | 233 | 67 |
| Alprazolam | Alprazolam | 231 | 53 |
| Atorvastatin Calcium | Atorvastatin Calcium | 212 | 69 |
| Losartan Potassium | Losartan Potassium | 188 | 57 |
| Amlodipine Besylate | Amlodipine Besylate | 180 | 54 |
| Metformin Hcl | Metformin Hcl | 170 | 52 |
| Lisinopril | Lisinopril | 134 | 42 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 132 | 47 |
| Gabapentin | Gabapentin | 124 | 33 |
| Metoprolol Succinate | Metoprolol Succinate | 123 | 39 |
| Furosemide | Furosemide | 122 | 33 |
| Prednisone | Prednisone | 119 | 57 |
| Oxycodone-Acetaminophen | Oxycodone Hcl/Acetaminophen | 114 | 14 |
| Simvastatin | Simvastatin | 107 | 30 |
| Potassium Chloride | Potassium Chloride | 103 | 29 |
| Hydrochlorothiazide | Hydrochlorothiazide | 100 | 35 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 99 | 32 |
| Pantoprazole Sodium | Pantoprazole Sodium | 88 | 34 |
| Metoprolol Tartrate | Metoprolol Tartrate | 87 | 27 |
| Fluticasone Propionate | Fluticasone Propionate | 79 | 34 |
| Tramadol Hcl | Tramadol Hcl | 79 | 14 |
| Escitalopram Oxalate | Escitalopram Oxalate | 78 | 21 |
| Duloxetine Hcl | Duloxetine Hcl | 72 | 18 |
| Celecoxib | Celecoxib | 65 | 14 |
| Eliquis | Apixaban | 64 | 16 |
| Tamsulosin Hcl | Tamsulosin Hcl | 63 | 21 |
| Clonazepam | Clonazepam | 62 | suppressed |
| Lisinopril-Hydrochlorothiazide | Lisinopril/Hydrochlorothiazide | 62 | 20 |
| Temazepam | Temazepam | 59 | 14 |
| Cyclobenzaprine Hcl | Cyclobenzaprine Hcl | 58 | 18 |
| Methocarbamol | Methocarbamol | 57 | 14 |
| Cephalexin | Cephalexin | 55 | 34 |
| Glipizide | Glipizide | 55 | 16 |
| Losartan-Hydrochlorothiazide | Losartan/Hydrochlorothiazide | 52 | 15 |
| Lorazepam | Lorazepam | 50 | suppressed |
| Ozempic | Semaglutide | 50 | 13 |
| Sertraline Hcl | Sertraline Hcl | 50 | 17 |
| Glimepiride | Glimepiride | 47 | 11 |
| Pregabalin | Pregabalin | 47 | suppressed |
| Zolpidem Tartrate | Zolpidem Tartrate | 47 | 16 |
| Atenolol | Atenolol | 46 | 12 |
| Lantus Solostar | Insulin Glargine,hum.Rec.Anlog | 46 | 13 |
| Citalopram Hbr | Citalopram Hydrobromide | 44 | suppressed |
| Diclofenac Sodium | Diclofenac Sodium | 44 | 18 |
| Ibuprofen | Ibuprofen | 43 | 14 |
| Ventolin Hfa | Albuterol Sulfate | 43 | 19 |
| Amoxicillin-Clavulanate Potass | Amoxicillin/Potassium Clav | 42 | 35 |
| Paroxetine Hcl | Paroxetine Hcl | 42 | 11 |
| Allopurinol | Allopurinol | 41 | 13 |
| Trazodone Hcl | Trazodone Hcl | 41 | 13 |
| Donepezil Hcl | Donepezil Hcl | 40 | suppressed |
| Trulicity | Dulaglutide | 40 | suppressed |
| Enalapril Maleate | Enalapril Maleate | 38 | suppressed |
| Bupropion Xl | Bupropion Hcl | 37 | suppressed |
| Diazepam | Diazepam | 34 | suppressed |
| Famotidine | Famotidine | 34 | 14 |
| Clonidine Hcl | Clonidine Hcl | 33 | suppressed |
| Metformin Hcl Er | Metformin Hcl | 33 | suppressed |
| Oxycodone Hcl | Oxycodone Hcl | 33 | suppressed |
| Azithromycin | Azithromycin | 32 | 27 |
| Nifedipine Er | Nifedipine | 31 | suppressed |
| Mounjaro | Tirzepatide | 30 | suppressed |
| Pravastatin Sodium | Pravastatin Sodium | 30 | suppressed |
| Triamterene-Hydrochlorothiazid | Triamterene/Hydrochlorothiazid | 30 | suppressed |
| Xarelto | Rivaroxaban | 30 | suppressed |
| Baclofen | Baclofen | 29 | suppressed |
| Clopidogrel | Clopidogrel Bisulfate | 29 | 11 |
| Fluoxetine Hcl | Fluoxetine Hcl | 28 | suppressed |
| Doxycycline Hyclate | Doxycycline Hyclate | 27 | 21 |
| Meclizine Hcl | Meclizine Hcl | 27 | suppressed |
| Abrysvo | Rsv Vacc, Pref A And Pref B/Pf | 25 | 25 |
| Carvedilol | Carvedilol | 25 | suppressed |
| Mupirocin | Mupirocin | 23 | 16 |
| Diphenoxylate-Atropine | Diphenoxylate Hcl/Atropine | 22 | suppressed |
| Meloxicam | Meloxicam | 22 | 12 |
| Triamcinolone Acetonide | Triamcinolone Acetonide | 22 | 11 |
| Amlodipine Besylate-Benazepril | Amlodipine Besylate/Benazepril | 21 | suppressed |
| Jardiance | Empagliflozin | 21 | suppressed |
| Propranolol Hcl | Propranolol Hcl | 21 | suppressed |
| Ropinirole Hcl | Ropinirole Hcl | 21 | suppressed |
| Alendronate Sodium | Alendronate Sodium | 20 | suppressed |
| Clotrimazole-Betamethasone | Clotrimazole/Betamethasone Dip | 20 | 12 |
| Dextroamphetamine-Amphetamine | Dextroamphetamine/Amphetamine | 20 | suppressed |
| Ezetimibe | Ezetimibe | 20 | suppressed |
| Ondansetron Odt | Ondansetron | 20 | 12 |
| Quetiapine Fumarate | Quetiapine Fumarate | 20 | suppressed |
| Spironolactone | Spironolactone | 20 | suppressed |
| Trelegy Ellipta | Fluticasone/Umeclidin/Vilanter | 20 | suppressed |
| Venlafaxine Hcl Er | Venlafaxine Hcl | 20 | suppressed |
| Cimetidine | Cimetidine | 19 | suppressed |
| Hydroxyzine Hcl | Hydroxyzine Hcl | 19 | suppressed |
| Montelukast Sodium | Montelukast Sodium | 19 | suppressed |
| Sulfamethoxazole-Trimethoprim | Sulfamethoxazole/Trimethoprim | 19 | 14 |
| Buspirone Hcl | Buspirone Hcl | 18 | suppressed |
| Megestrol Acetate | Megestrol Acetate | 18 | suppressed |
| Dicyclomine Hcl | Dicyclomine Hcl | 17 | suppressed |
| Isosorbide Mononitrate Er | Isosorbide Mononitrate | 17 | suppressed |
| Pioglitazone Hcl | Pioglitazone Hcl | 17 | suppressed |
| Fluticasone-Salmeterol | Fluticasone Propion/Salmeterol | 16 | suppressed |
| Memantine Hcl | Memantine Hcl | 16 | suppressed |
| Rybelsus | Semaglutide | 16 | suppressed |
| Sumatriptan Succinate | Sumatriptan Succinate | 16 | suppressed |
| Synthroid | Levothyroxine Sodium | 16 | suppressed |
| Tizanidine Hcl | Tizanidine Hcl | 16 | suppressed |
| Fenofibrate | Fenofibrate Nanocrystallized | 15 | suppressed |
| Ketoconazole | Ketoconazole | 15 | suppressed |
| Testosterone Cypionate | Testosterone Cypionate | 15 | suppressed |
| Advair Hfa | Fluticasone Propion/Salmeterol | 14 | suppressed |
| Diltiazem 24hr Er (Cd) | Diltiazem Hcl | 14 | suppressed |
| Jantoven | Warfarin Sodium | 14 | suppressed |
| Acetaminophen-Codeine | Acetaminophen With Codeine | 13 | suppressed |
| Budesonide-Formoterol Fumarate | Budesonide/Formoterol Fumarate | 13 | suppressed |
| Ezetimibe-Simvastatin | Ezetimibe/Simvastatin | 13 | suppressed |
| Fluconazole | Fluconazole | 13 | suppressed |
| Nabumetone | Nabumetone | 13 | suppressed |
| Novolog Flexpen | Insulin Aspart | 13 | suppressed |
| Nystatin | Nystatin | 13 | suppressed |
| Oxybutynin Chloride Er | Oxybutynin Chloride | 13 | suppressed |
| Ultra-Fine Mini Pen Needle | Pen Needle, Diabetic | 13 | suppressed |
| Vitamin D2 | Ergocalciferol (Vitamin D2) | 13 | suppressed |
| Xtampza Er | Oxycodone Myristate | 13 | suppressed |
| Brilinta | Ticagrelor | 12 | suppressed |
| Clobetasol Propionate | Clobetasol Propionate | 12 | suppressed |
| Esomeprazole Magnesium | Esomeprazole Magnesium | 12 | suppressed |
| Hydrocortisone | Hydrocortisone | 12 | suppressed |
| Klor-Con M10 | Potassium Chloride | 12 | suppressed |
| Ultra-Fine Short Pen Needle | Pen Needle, Diabetic | 12 | suppressed |
| Combivent Respimat | Ipratropium/Albuterol Sulfate | 11 | suppressed |
| Etodolac | Etodolac | 11 | suppressed |
| Hydroxychloroquine Sulfate | Hydroxychloroquine Sulfate | 11 | suppressed |
| Januvia | Sitagliptin Phosphate | 11 | suppressed |
| Risperidone | Risperidone | 11 | suppressed |
| Torsemide | Torsemide | 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