Healthcare provider profile · identity verified

Mark S Bostwick, MD

Internal Medicine · PORT WASHINGTON, WI · NPI 1487686614

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	688	160
Losartan Potassium	Losartan Potassium	419	105
Amlodipine Besylate	Amlodipine Besylate	321	74
Lisinopril	Lisinopril	283	65
Levothyroxine Sodium	Levothyroxine Sodium	273	61
Omeprazole	Omeprazole	217	56
Simvastatin	Simvastatin	215	53
Eliquis	Apixaban	214	29
Atenolol	Atenolol	213	49
Furosemide	Furosemide	211	46
Hydrochlorothiazide	Hydrochlorothiazide	211	54
Metoprolol Succinate	Metoprolol Succinate	210	47
Tamsulosin Hcl	Tamsulosin Hcl	175	42
Metformin Hcl	Metformin Hcl	164	42
Pantoprazole Sodium	Pantoprazole Sodium	150	42
Albuterol Sulfate Hfa	Albuterol Sulfate	142	54
Escitalopram Oxalate	Escitalopram Oxalate	132	25
Pravastatin Sodium	Pravastatin Sodium	130	34
Gabapentin	Gabapentin	124	28
Metformin Hcl Er	Metformin Hcl	120	27
Potassium Chloride	Potassium Chloride	114	25
Glimepiride	Glimepiride	107	27
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	105	29
Allopurinol	Allopurinol	102	24
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	99	26
Metoprolol Tartrate	Metoprolol Tartrate	98	23
Rosuvastatin Calcium	Rosuvastatin Calcium	93	21
Warfarin Sodium	Warfarin Sodium	90	17
Alprazolam	Alprazolam	87	14
Lorazepam	Lorazepam	83	14
Tramadol Hcl	Tramadol Hcl	79	17
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	78	15
Clopidogrel	Clopidogrel Bisulfate	70	25
Finasteride	Finasteride	70	13
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	63	12
Fluoxetine Hcl	Fluoxetine Hcl	60	suppressed
Diclofenac Sodium	Diclofenac Sodium	57	20
Valsartan	Valsartan	55	12
Methylprednisolone	Methylprednisolone	52	43
Lovastatin	Lovastatin	51	12
Xarelto	Rivaroxaban	51	suppressed
Doxycycline Monohydrate	Doxycycline Monohydrate	50	41
Donepezil Hcl	Donepezil Hcl	49	suppressed
Trazodone Hcl	Trazodone Hcl	49	13
Montelukast Sodium	Montelukast Sodium	47	12
Fluticasone Propionate	Fluticasone Propionate	46	19
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	46	13
Quetiapine Fumarate	Quetiapine Fumarate	46	suppressed
Alendronate Sodium	Alendronate Sodium	45	12
Sertraline Hcl	Sertraline Hcl	45	11
Carvedilol	Carvedilol	44	suppressed
Symbicort	Budesonide/Formoterol Fumarate	44	12
Fenofibrate	Fenofibrate	43	13
Prednisone	Prednisone	42	11
Citalopram Hbr	Citalopram Hydrobromide	41	suppressed
Amoxicillin	Amoxicillin	40	29
Meloxicam	Meloxicam	39	16
Breo Ellipta	Fluticasone/Vilanterol	38	suppressed
Diazepam	Diazepam	37	suppressed
Advair Hfa	Fluticasone Propion/Salmeterol	35	suppressed
Jardiance	Empagliflozin	34	suppressed
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	34	suppressed
Clonidine Hcl	Clonidine Hcl	32	suppressed
Atenolol-Chlorthalidone	Atenolol/Chlorthalidone	30	suppressed
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	30	suppressed
Pregabalin	Pregabalin	29	suppressed
Midodrine Hcl	Midodrine Hcl	28	suppressed
Spironolactone	Spironolactone	28	11
Ciprofloxacin Hcl	Ciprofloxacin Hcl	26	23
Enalapril Maleate	Enalapril Maleate	26	suppressed
Levetiracetam	Levetiracetam	26	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	26	20
Clonazepam	Clonazepam	25	suppressed
Glipizide Er	Glipizide	25	suppressed
Oxycodone Hcl	Oxycodone Hcl	25	suppressed
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	25	suppressed
Divalproex Sodium	Divalproex Sodium	24	suppressed
Myrbetriq	Mirabegron	24	suppressed
Ozempic	Semaglutide	24	suppressed
Tizanidine Hcl	Tizanidine Hcl	24	16
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	23	12
Glipizide	Glipizide	23	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	23	suppressed
Loperamide	Loperamide Hcl	22	suppressed
Nortriptyline Hcl	Nortriptyline Hcl	22	suppressed
Alfuzosin Hcl Er	Alfuzosin Hcl	21	suppressed
Levofloxacin	Levofloxacin	21	14
Arnuity Ellipta	Fluticasone Furoate	20	suppressed
Dextroamphetamine-Amphetamine	Dextroamphetamine/Amphetamine	20	suppressed
Diltiazem 24hr Er	Diltiazem Hcl	20	suppressed
Paroxetine Hcl	Paroxetine Hcl	20	suppressed
Terazosin Hcl	Terazosin Hcl	20	suppressed
Clotrimazole	Clotrimazole	19	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	19	suppressed
Fludrocortisone Acetate	Fludrocortisone Acetate	19	suppressed
Hydralazine Hcl	Hydralazine Hcl	19	suppressed
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	18	suppressed
Cephalexin	Cephalexin	18	14
Famotidine	Famotidine	18	suppressed
Aripiprazole	Aripiprazole	17	suppressed
Clindamycin Hcl	Clindamycin Hcl	17	14
Qvar Redihaler	Beclomethasone Dipropionate	17	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	16	15
Flecainide Acetate	Flecainide Acetate	16	suppressed
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	16	suppressed
Azithromycin	Azithromycin	15	14
Duloxetine Hcl	Duloxetine Hcl	15	suppressed
Ezetimibe	Ezetimibe	15	suppressed
Verapamil Er	Verapamil Hcl	15	suppressed
Acetaminophen-Codeine	Acetaminophen With Codeine	14	suppressed
Autoshield Duo Pen Needle	Pen Needle,dual Safety,diabetc	14	suppressed
Gemfibrozil	Gemfibrozil	14	suppressed
Insulin Lispro Kwikpen U-100	Insulin Lispro	14	suppressed
Novolin N	Insulin Nph Human Isophane	14	suppressed
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	14	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	14	suppressed
Amiodarone Hcl	Amiodarone Hcl	13	suppressed
Brilinta	Ticagrelor	13	suppressed
Carbidopa-Levodopa	Carbidopa/Levodopa	13	suppressed
Cefdinir	Cefdinir	13	13
Combivent Respimat	Ipratropium/Albuterol Sulfate	13	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	13	suppressed
Mounjaro	Tirzepatide	13	suppressed
Nystatin	Nystatin	13	suppressed
Sevelamer Carbonate	Sevelamer Carbonate	13	suppressed
Torsemide	Torsemide	13	suppressed
Amiloride Hcl	Amiloride Hcl	12	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	12	suppressed
Humalog Kwikpen U-100	Insulin Lispro	12	suppressed
Ketoconazole	Ketoconazole	12	suppressed
Lumigan	Bimatoprost	12	suppressed
Meclizine Hcl	Meclizine Hcl	12	suppressed
Valacyclovir	Valacyclovir Hcl	12	suppressed
Bupropion Xl	Bupropion Hcl	11	suppressed
Dulera	Mometasone/Formoterol	11	suppressed
Latanoprost	Latanoprost	11	suppressed
Novolin R	Insulin Regular, Human	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