Healthcare provider profile · identity verified

Brian J Demaster, MD

Family Practice · CEDAR GROVE, WI · NPI 1043325293

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	726	177
Amlodipine Besylate	Amlodipine Besylate	499	125
Levothyroxine Sodium	Levothyroxine Sodium	430	88
Furosemide	Furosemide	394	81
Hydrochlorothiazide	Hydrochlorothiazide	333	82
Metoprolol Succinate	Metoprolol Succinate	304	75
Lisinopril	Lisinopril	297	75
Omeprazole	Omeprazole	267	69
Metformin Hcl Er	Metformin Hcl	259	70
Pantoprazole Sodium	Pantoprazole Sodium	237	51
Rosuvastatin Calcium	Rosuvastatin Calcium	236	65
Losartan Potassium	Losartan Potassium	225	59
Metformin Hcl	Metformin Hcl	221	48
Potassium Chloride	Potassium Chloride	208	43
Simvastatin	Simvastatin	188	46
Gabapentin	Gabapentin	187	39
Tamsulosin Hcl	Tamsulosin Hcl	187	45
Pravastatin Sodium	Pravastatin Sodium	185	48
Eliquis	Apixaban	162	30
Metoprolol Tartrate	Metoprolol Tartrate	162	42
Allopurinol	Allopurinol	158	39
Trazodone Hcl	Trazodone Hcl	144	26
Clopidogrel	Clopidogrel Bisulfate	143	30
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	142	29
Fluticasone Propionate	Fluticasone Propionate	139	52
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	139	37
Escitalopram Oxalate	Escitalopram Oxalate	136	34
Glipizide Er	Glipizide	130	36
Atenolol	Atenolol	129	35
Warfarin Sodium	Warfarin Sodium	122	22
Sertraline Hcl	Sertraline Hcl	120	26
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	117	29
Meloxicam	Meloxicam	117	36
Jardiance	Empagliflozin	109	19
Alprazolam	Alprazolam	97	19
Famotidine	Famotidine	87	17
Tramadol Hcl	Tramadol Hcl	87	19
Carvedilol	Carvedilol	86	17
Tizanidine Hcl	Tizanidine Hcl	80	18
Duloxetine Hcl	Duloxetine Hcl	74	11
Zolpidem Tartrate	Zolpidem Tartrate	71	19
Donepezil Hcl	Donepezil Hcl	64	16
Albuterol Sulfate Hfa	Albuterol Sulfate	63	28
Finasteride	Finasteride	62	12
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	61	suppressed
Glipizide	Glipizide	57	14
Alendronate Sodium	Alendronate Sodium	55	suppressed
Sucralfate	Sucralfate	55	suppressed
Boostrix Tdap	Diphth,pertuss(Acell),tet Vac	54	52
Oxybutynin Chloride Er	Oxybutynin Chloride	53	11
Bupropion Xl	Bupropion Hcl	52	12
Memantine Hcl	Memantine Hcl	52	11
Venlafaxine Hcl Er	Venlafaxine Hcl	52	11
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	49	11
Pioglitazone Hcl	Pioglitazone Hcl	48	12
Ozempic	Semaglutide	47	12
Ezetimibe	Ezetimibe	45	suppressed
Citalopram Hbr	Citalopram Hydrobromide	44	11
Mirtazapine	Mirtazapine	43	12
Pregabalin	Pregabalin	43	suppressed
Autoshield Duo Pen Needle	Pen Needle,dual Safety,diabetc	41	11
Fluoxetine Hcl	Fluoxetine Hcl	41	suppressed
Baclofen	Baclofen	38	suppressed
Glimepiride	Glimepiride	38	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	38	17
Valsartan	Valsartan	38	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	36	suppressed
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	36	suppressed
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	35	suppressed
Hydralazine Hcl	Hydralazine Hcl	35	suppressed
Clonazepam	Clonazepam	34	suppressed
Prednisone	Prednisone	33	16
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	31	suppressed
Myrbetriq	Mirabegron	30	suppressed
Shingrix	Varicella-Zoster Ge/As01b/Pf	30	26
Buspirone Hcl	Buspirone Hcl	29	suppressed
Trulicity	Dulaglutide	29	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	28	15
Dutasteride	Dutasteride	28	suppressed
Montelukast Sodium	Montelukast Sodium	28	suppressed
Digoxin	Digoxin	27	suppressed
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	27	suppressed
Terazosin Hcl	Terazosin Hcl	27	suppressed
Azithromycin	Azithromycin	25	23
Clonidine Hcl	Clonidine Hcl	25	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	25	suppressed
Lamotrigine	Lamotrigine	25	suppressed
Ultra-Fine Short Pen Needle	Pen Needle, Diabetic	25	suppressed
Xarelto	Rivaroxaban	25	suppressed
Cephalexin	Cephalexin	24	12
Enalapril Maleate	Enalapril Maleate	24	suppressed
Lorazepam	Lorazepam	24	suppressed
Propranolol Hcl Er	Propranolol Hcl	23	suppressed
Benazepril-Hydrochlorothiazide	Benazepril/Hydrochlorothiazide	22	suppressed
Bupropion Hcl Sr	Bupropion Hcl	22	suppressed
Nifedipine Er	Nifedipine	22	suppressed
Ropinirole Hcl	Ropinirole Hcl	22	suppressed
Synthroid	Levothyroxine Sodium	22	suppressed
Solifenacin Succinate	Solifenacin Succinate	21	suppressed
Ibuprofen	Ibuprofen	20	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	20	suppressed
Ipratropium Bromide	Ipratropium Bromide	19	suppressed
Lovastatin	Lovastatin	19	suppressed
Diazepam	Diazepam	18	suppressed
Diltiazem 24hr Er	Diltiazem Hcl	18	suppressed
Fenofibrate	Fenofibrate	18	suppressed
Spironolactone	Spironolactone	18	suppressed
Ultra-Fine Mini Pen Needle	Pen Needle, Diabetic	18	suppressed
Azelastine Hcl	Azelastine Hcl	17	suppressed
Chlorthalidone	Chlorthalidone	17	suppressed
Colestipol Hcl	Colestipol Hcl	17	suppressed
Humalog Mix 75-25 Kwikpen	Insulin Lispro Protamin/Lispro	17	suppressed
Benazepril Hcl	Benazepril Hcl	16	suppressed
Breo Ellipta	Fluticasone/Vilanterol	16	suppressed
Carbidopa-Levodopa	Carbidopa/Levodopa	16	suppressed
Clotrimazole-Betamethasone	Clotrimazole/Betamethasone Dip	16	suppressed
Phenytoin Sodium Extended	Phenytoin Sodium Extended	16	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	15	suppressed
Humalog Kwikpen U-100	Insulin Lispro	15	suppressed
Klor-Con M20	Potassium Chloride	15	suppressed
Topiramate	Topiramate	15	suppressed
Desvenlafaxine Succinate Er	Desvenlafaxine Succinate	14	suppressed
Diclofenac Sodium	Diclofenac Sodium	14	suppressed
Glipizide-Metformin	Glipizide/Metformin Hcl	14	suppressed
Januvia	Sitagliptin Phosphate	14	suppressed
Mounjaro	Tirzepatide	14	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	14	11
Verapamil Hcl	Verapamil Hcl	14	suppressed
Butalbital-Acetaminophen-Caffe	Butalb/Acetaminophen/Caffeine	13	suppressed
Mupirocin	Mupirocin	13	suppressed
Olanzapine	Olanzapine	13	suppressed
Arnuity Ellipta	Fluticasone Furoate	12	suppressed
Bydureon Bcise	Exenatide Microspheres	12	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	12	suppressed
Jantoven	Warfarin Sodium	12	suppressed
Olmesartan Medoxomil	Olmesartan Medoxomil	12	suppressed
Bisoprolol-Hydrochlorothiazide	Bisoprolol/Hydrochlorothiazide	11	suppressed
Celecoxib	Celecoxib	11	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	11	suppressed
Fenofibrate	Fenofibrate Nanocrystallized	11	suppressed
Mometasone Furoate	Mometasone Furoate	11	suppressed
Nystatin	Nystatin	11	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	11	11

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