Healthcare provider profile · identity verified

Karl Brenner, M.D.

Internal Medicine · ANN ARBOR, MI · NPI 1033186770

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	686	183
Levothyroxine Sodium	Levothyroxine Sodium	420	104
Lisinopril	Lisinopril	414	109
Amlodipine Besylate	Amlodipine Besylate	391	109
Tamsulosin Hcl	Tamsulosin Hcl	313	81
Metoprolol Succinate	Metoprolol Succinate	297	80
Simvastatin	Simvastatin	295	77
Losartan Potassium	Losartan Potassium	285	80
Metformin Hcl	Metformin Hcl	222	67
Olmesartan Medoxomil	Olmesartan Medoxomil	216	63
Omeprazole	Omeprazole	209	60
Rosuvastatin Calcium	Rosuvastatin Calcium	207	64
Eliquis	Apixaban	200	48
Metformin Hcl Er	Metformin Hcl	169	47
Furosemide	Furosemide	136	46
Pravastatin Sodium	Pravastatin Sodium	128	36
Gabapentin	Gabapentin	127	35
Metoprolol Tartrate	Metoprolol Tartrate	119	37
Hydrochlorothiazide	Hydrochlorothiazide	110	39
Carvedilol	Carvedilol	91	25
Mounjaro	Tirzepatide	91	17
Citalopram Hbr	Citalopram Hydrobromide	90	27
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	87	22
Spironolactone	Spironolactone	86	17
Glimepiride	Glimepiride	85	23
Xarelto	Rivaroxaban	85	20
Duloxetine Hcl	Duloxetine Hcl	84	21
Jardiance	Empagliflozin	84	26
Allopurinol	Allopurinol	83	28
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	81	23
Pantoprazole Sodium	Pantoprazole Sodium	80	23
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	75	20
Lovastatin	Lovastatin	75	15
Bupropion Xl	Bupropion Hcl	74	22
Sertraline Hcl	Sertraline Hcl	74	15
Trazodone Hcl	Trazodone Hcl	74	22
Tramadol Hcl	Tramadol Hcl	72	18
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	71	19
Prednisone	Prednisone	71	57
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	69	16
Meloxicam	Meloxicam	68	16
Montelukast Sodium	Montelukast Sodium	66	18
Clopidogrel	Clopidogrel Bisulfate	65	19
Albuterol Sulfate Hfa	Albuterol Sulfate	64	27
Ozempic	Semaglutide	64	suppressed
Escitalopram Oxalate	Escitalopram Oxalate	63	16
Glipizide Er	Glipizide	62	15
Warfarin Sodium	Warfarin Sodium	61	19
Atenolol	Atenolol	58	16
Clonazepam	Clonazepam	57	suppressed
Terazosin Hcl	Terazosin Hcl	57	16
Azithromycin	Azithromycin	53	47
Chlorthalidone	Chlorthalidone	51	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	51	17
Valacyclovir	Valacyclovir Hcl	50	15
Potassium Chloride	Potassium Chloride	49	17
Alprazolam	Alprazolam	48	13
Finasteride	Finasteride	48	17
Fluticasone Propionate	Fluticasone Propionate	47	16
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	43	13
Cephalexin	Cephalexin	41	38
Triamcinolone Acetonide	Triamcinolone Acetonide	40	24
Famotidine	Famotidine	39	12
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	39	suppressed
Irbesartan	Irbesartan	38	suppressed
Glipizide	Glipizide	36	12
Synthroid	Levothyroxine Sodium	36	suppressed
Alendronate Sodium	Alendronate Sodium	34	suppressed
Ezetimibe	Ezetimibe	32	13
Valsartan	Valsartan	30	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	29	12
Hydralazine Hcl	Hydralazine Hcl	28	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	28	suppressed
Paroxetine Hcl	Paroxetine Hcl	28	suppressed
Olmesartan-Hydrochlorothiazide	Olmesartan/Hydrochlorothiazide	27	suppressed
Lorazepam	Lorazepam	26	suppressed
Trulicity	Dulaglutide	26	suppressed
Metronidazole	Metronidazole	25	suppressed
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	25	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	24	suppressed
Candesartan Cilexetil	Candesartan Cilexetil	23	suppressed
Ibuprofen	Ibuprofen	23	suppressed
Methylprednisolone	Methylprednisolone	23	20
Ultra-Fine Short Pen Needle	Pen Needle, Diabetic	23	suppressed
Donepezil Hcl	Donepezil Hcl	22	suppressed
Ibu	Ibuprofen	22	suppressed
Januvia	Sitagliptin Phosphate	22	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	21	suppressed
Nadolol	Nadolol	21	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	21	16
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	20	suppressed
Nitroglycerin	Nitroglycerin	20	14
Fenofibrate	Fenofibrate	18	suppressed
Estradiol	Estradiol	17	suppressed
Methocarbamol	Methocarbamol	17	suppressed
Nystatin	Nystatin	17	suppressed
Paxlovid	Nirmatrelvir/Ritonavir	17	17
Pregabalin	Pregabalin	17	suppressed
Amiodarone Hcl	Amiodarone Hcl	16	suppressed
Amoxicillin	Amoxicillin	16	11
Colchicine	Colchicine	16	suppressed
Ketoconazole	Ketoconazole	16	suppressed
Propranolol Hcl	Propranolol Hcl	16	suppressed
Ultra-Fine Mini Pen Needle	Pen Needle, Diabetic	16	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	16	suppressed
Ipratropium Bromide	Ipratropium Bromide	15	suppressed
Temazepam	Temazepam	15	suppressed
Terbinafine Hcl	Terbinafine Hcl	15	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	14	suppressed
Betamethasone Dipropionate	Betamethasone Dipropionate	14	suppressed
Lansoprazole	Lansoprazole	14	suppressed
Loperamide	Loperamide Hcl	14	suppressed
Propranolol Hcl Er	Propranolol Hcl	14	suppressed
Ramipril	Ramipril	14	suppressed
Tolterodine Tartrate	Tolterodine Tartrate	14	suppressed
Verapamil Er	Verapamil Hcl	14	suppressed
Acetaminophen-Codeine	Acetaminophen With Codeine	13	suppressed
Breo Ellipta	Fluticasone/Vilanterol	13	suppressed
Candesartan-Hydrochlorothiazid	Candesartan/Hydrochlorothiazid	13	suppressed
Clonidine Hcl	Clonidine Hcl	13	suppressed
Diphenoxylate-Atropine	Diphenoxylate Hcl/Atropine	13	suppressed
Enbrel Sureclick	Etanercept	13	suppressed
Klor-Con M20	Potassium Chloride	13	suppressed
Mirtazapine	Mirtazapine	13	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	13	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	13	suppressed
Verapamil Sr	Verapamil Hcl	13	suppressed
Azelastine Hcl	Azelastine Hcl	12	suppressed
Doxycycline Hyclate	Doxycycline Hyclate	12	suppressed
Lidocaine	Lidocaine	12	suppressed
Nifedipine Er	Nifedipine	12	suppressed
Ondansetron Odt	Ondansetron	12	suppressed
Baclofen	Baclofen	11	suppressed
Fenofibrate	Fenofibrate Nanocrystallized	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