Healthcare provider profile · identity verified

William R. Cooper, MD

Internal Medicine · OCONOMOWOC, WI · NPI 1023078037

Profile state: partd only Open Payments: 2025 Medicare Part D: 2024 Last identity check: 2026-08-10 Page data build: 2026-08-12

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.

Payment overview · 2025

General Payments

We did not find matching Open Payments records for this doctor in the selected program year.

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	1007	225
Losartan Potassium	Losartan Potassium	709	167
Levothyroxine Sodium	Levothyroxine Sodium	527	111
Amlodipine Besylate	Amlodipine Besylate	487	121
Pantoprazole Sodium	Pantoprazole Sodium	385	86
Eliquis	Apixaban	368	55
Furosemide	Furosemide	349	71
Metoprolol Succinate	Metoprolol Succinate	344	77
Lisinopril	Lisinopril	333	76
Potassium Chloride	Potassium Chloride	303	71
Gabapentin	Gabapentin	302	66
Sertraline Hcl	Sertraline Hcl	241	52
Omeprazole	Omeprazole	229	65
Metoprolol Tartrate	Metoprolol Tartrate	216	51
Tamsulosin Hcl	Tamsulosin Hcl	214	49
Hydrochlorothiazide	Hydrochlorothiazide	205	52
Rosuvastatin Calcium	Rosuvastatin Calcium	197	41
Pravastatin Sodium	Pravastatin Sodium	190	49
Warfarin Sodium	Warfarin Sodium	185	20
Spironolactone	Spironolactone	173	29
Simvastatin	Simvastatin	164	36
Carvedilol	Carvedilol	155	37
Metformin Hcl	Metformin Hcl	142	40
Metformin Hcl Er	Metformin Hcl	127	28
Clopidogrel	Clopidogrel Bisulfate	125	28
Jardiance	Empagliflozin	111	22
Donepezil Hcl	Donepezil Hcl	109	21
Valsartan	Valsartan	107	27
Allopurinol	Allopurinol	103	24
Fluticasone Propionate	Fluticasone Propionate	103	35
Tramadol Hcl	Tramadol Hcl	102	30
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	101	30
Hydralazine Hcl	Hydralazine Hcl	96	18
Prednisone	Prednisone	96	33
Citalopram Hbr	Citalopram Hydrobromide	91	15
Memantine Hcl	Memantine Hcl	90	13
Escitalopram Oxalate	Escitalopram Oxalate	89	20
Albuterol Sulfate Hfa	Albuterol Sulfate	84	38
Alprazolam	Alprazolam	83	11
Duloxetine Hcl	Duloxetine Hcl	76	21
Trazodone Hcl	Trazodone Hcl	72	21
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	70	20
Famotidine	Famotidine	67	16
Atenolol	Atenolol	62	13
Venlafaxine Hcl Er	Venlafaxine Hcl	60	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	59	11
Finasteride	Finasteride	57	12
Terazosin Hcl	Terazosin Hcl	57	14
Isosorbide Mononitrate Er	Isosorbide Mononitrate	56	suppressed
Ozempic	Semaglutide	56	suppressed
Lovastatin	Lovastatin	54	suppressed
Xarelto	Rivaroxaban	54	suppressed
Ezetimibe	Ezetimibe	52	17
Lorazepam	Lorazepam	52	22
Ropinirole Hcl	Ropinirole Hcl	51	suppressed
Latanoprost	Latanoprost	50	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	50	21
Meloxicam	Meloxicam	49	19
Montelukast Sodium	Montelukast Sodium	49	11
Amiodarone Hcl	Amiodarone Hcl	45	suppressed
Bumetanide	Bumetanide	44	suppressed
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	43	13
Glimepiride	Glimepiride	43	11
Mirtazapine	Mirtazapine	38	11
Azithromycin	Azithromycin	37	17
Digoxin	Digoxin	37	suppressed
Tradjenta	Linagliptin	37	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	37	11
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	36	suppressed
Carbidopa-Levodopa	Carbidopa/Levodopa	35	suppressed
Baclofen	Baclofen	34	suppressed
Irbesartan	Irbesartan	34	suppressed
Benazepril Hcl	Benazepril Hcl	33	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	33	suppressed
Glipizide	Glipizide	33	suppressed
Doxycycline Monohydrate	Doxycycline Monohydrate	32	20
Buspirone Hcl	Buspirone Hcl	31	suppressed
Divalproex Sodium Er	Divalproex Sodium	31	suppressed
Ipratropium Bromide	Ipratropium Bromide	31	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	30	suppressed
Diazepam	Diazepam	29	suppressed
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	29	suppressed
Primidone	Primidone	28	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	27	suppressed
Carbidopa-Levodopa Er	Carbidopa/Levodopa	26	suppressed
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	26	suppressed
Zonisamide	Zonisamide	26	suppressed
Alfuzosin Hcl Er	Alfuzosin Hcl	25	suppressed
Olmesartan Medoxomil	Olmesartan Medoxomil	25	suppressed
Phenytoin Sodium Extended	Phenytoin Sodium Extended	25	suppressed
Amoxicillin	Amoxicillin	24	14
Aripiprazole	Aripiprazole	24	suppressed
Autoshield Duo Pen Needle	Pen Needle,dual Safety,diabetc	23	suppressed
Lansoprazole	Lansoprazole	23	suppressed
Bupropion Hcl Sr	Bupropion Hcl	22	suppressed
Glipizide Er	Glipizide	22	suppressed
Myrbetriq	Mirabegron	22	suppressed
Verapamil Er	Verapamil Hcl	22	suppressed
Folic Acid	Folic Acid	21	suppressed
Ketoconazole	Ketoconazole	21	suppressed
Bupropion Xl	Bupropion Hcl	20	suppressed
Incruse Ellipta	Umeclidinium Bromide	20	suppressed
Levetiracetam	Levetiracetam	20	suppressed
Cephalexin	Cephalexin	19	13
Diltiazem 24hr Er	Diltiazem Hcl	19	suppressed
Symbicort	Budesonide/Formoterol Fumarate	19	suppressed
Breo Ellipta	Fluticasone/Vilanterol	18	suppressed
Spiriva Handihaler	Tiotropium Bromide	18	suppressed
Brimonidine Tartrate	Brimonidine Tartrate	17	suppressed
Celecoxib	Celecoxib	17	suppressed
Gemtesa	Vibegron	17	suppressed
Jantoven	Warfarin Sodium	17	suppressed
Klor-Con M20	Potassium Chloride	17	suppressed
Nystatin	Nystatin	17	suppressed
Paroxetine Hcl	Paroxetine Hcl	17	suppressed
Synthroid	Levothyroxine Sodium	17	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	16	suppressed
Klor-Con M10	Potassium Chloride	16	suppressed
Loperamide	Loperamide Hcl	16	11
Pregabalin	Pregabalin	16	suppressed
Alendronate Sodium	Alendronate Sodium	15	suppressed
Hydroxyurea	Hydroxyurea	15	suppressed
Ventolin Hfa	Albuterol Sulfate	15	suppressed
Chlorhexidine Gluconate	Chlorhexidine Gluconate	14	suppressed
Clonazepam	Clonazepam	14	suppressed
Doxycycline Hyclate	Doxycycline Hyclate	14	suppressed
Atrovent Hfa	Ipratropium Bromide	13	suppressed
Cilostazol	Cilostazol	13	suppressed
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	13	suppressed
Diclofenac Sodium	Diclofenac Sodium	13	suppressed
Dutasteride	Dutasteride	13	suppressed
Hydrocortisone	Hydrocortisone	13	suppressed
Isosorbide Dinitrate	Isosorbide Dinitrate	13	suppressed
Spiriva Respimat	Tiotropium Bromide	13	suppressed
Timolol Maleate	Timolol Maleate	13	suppressed
Acyclovir	Acyclovir	12	suppressed
Alcohol Prep Pads	Alcohol Antiseptic Pads	12	suppressed
Amantadine	Amantadine Hcl	12	suppressed
Carbamazepine	Carbamazepine	12	suppressed
Desmopressin Acetate	Desmopressin Acetate	12	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	12	suppressed
Entacapone	Entacapone	12	suppressed
Estradiol	Estradiol	12	suppressed
Humulin 70-30	Insulin Nph Hum/Reg Insulin Hm	12	suppressed
Hydroxychloroquine Sulfate	Hydroxychloroquine Sulfate	12	suppressed
Januvia	Sitagliptin Phosphate	12	suppressed
Lamotrigine	Lamotrigine	12	suppressed
Methenamine Hippurate	Methenamine Hippurate	12	suppressed
Metoclopramide Hcl	Metoclopramide Hcl	12	suppressed
Sulfasalazine	Sulfasalazine	12	suppressed
Temazepam	Temazepam	12	suppressed
Tiotropium Bromide	Tiotropium Bromide	12	suppressed
Topiramate	Topiramate	12	suppressed
Midodrine Hcl	Midodrine Hcl	11	suppressed
Nitroglycerin	Nitroglycerin	11	11
Prasugrel Hcl	Prasugrel Hcl	11	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	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

Methodology version: 2.1

Editorial template version: 2.4

Product contract version: 2.0

Schema version: 0.7.0

Page data build: 2026-08-12T23:34:59.370714+00:00

Publication policy: eligible for indexing after public-launch controls are enabled

Full methodology · Questions & answers · Report a possible error