Healthcare provider profile · identity verified

Alexander A Stemer, MD

Infectious Disease · MUNSTER, IN · NPI 1861451429

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	583	115
Amlodipine Besylate	Amlodipine Besylate	485	61
Furosemide	Furosemide	483	79
Pantoprazole Sodium	Pantoprazole Sodium	408	94
Levothyroxine Sodium	Levothyroxine Sodium	393	79
Tamsulosin Hcl	Tamsulosin Hcl	365	51
Sertraline Hcl	Sertraline Hcl	341	46
Gabapentin	Gabapentin	340	52
Donepezil Hcl	Donepezil Hcl	304	38
Memantine Hcl	Memantine Hcl	288	33
Potassium Chloride	Potassium Chloride	261	62
Metoprolol Tartrate	Metoprolol Tartrate	258	45
Eliquis	Apixaban	248	60
Escitalopram Oxalate	Escitalopram Oxalate	246	19
Lisinopril	Lisinopril	245	22
Xarelto	Rivaroxaban	200	26
Losartan Potassium	Losartan Potassium	192	30
Famotidine	Famotidine	183	20
Carvedilol	Carvedilol	167	40
Spironolactone	Spironolactone	162	11
Omeprazole	Omeprazole	159	27
Metoprolol Succinate	Metoprolol Succinate	150	45
Montelukast Sodium	Montelukast Sodium	150	17
Simvastatin	Simvastatin	135	17
Citalopram Hbr	Citalopram Hydrobromide	129	suppressed
Trazodone Hcl	Trazodone Hcl	124	21
Finasteride	Finasteride	122	24
Clopidogrel	Clopidogrel Bisulfate	119	36
Allopurinol	Allopurinol	110	25
Mirtazapine	Mirtazapine	102	21
Amiodarone Hcl	Amiodarone Hcl	98	27
Metformin Hcl	Metformin Hcl	97	19
Prednisone	Prednisone	91	24
Hydrochlorothiazide	Hydrochlorothiazide	82	11
Hydralazine Hcl	Hydralazine Hcl	78	16
Januvia	Sitagliptin Phosphate	78	suppressed
Carbidopa-Levodopa	Carbidopa/Levodopa	76	suppressed
Duloxetine Hcl	Duloxetine Hcl	75	18
Isosorbide Mononitrate Er	Isosorbide Mononitrate	66	13
Risperidone	Risperidone	66	suppressed
Methenamine Hippurate	Methenamine Hippurate	64	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	64	12
Diltiazem Hcl	Diltiazem Hcl	62	suppressed
Buspirone Hcl	Buspirone Hcl	61	15
Oxybutynin Chloride Er	Oxybutynin Chloride	61	12
Midodrine Hcl	Midodrine Hcl	60	24
Glimepiride	Glimepiride	57	11
Divalproex Sodium	Divalproex Sodium	53	suppressed
Folic Acid	Folic Acid	49	suppressed
Azithromycin	Azithromycin	48	suppressed
Levetiracetam	Levetiracetam	47	14
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	47	suppressed
Propranolol Hcl	Propranolol Hcl	42	suppressed
Rosuvastatin Calcium	Rosuvastatin Calcium	42	suppressed
Alendronate Sodium	Alendronate Sodium	41	suppressed
Glipizide Er	Glipizide	39	suppressed
Klor-Con M20	Potassium Chloride	36	suppressed
Nifedipine Er	Nifedipine	36	suppressed
Atenolol	Atenolol	34	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	34	suppressed
Ondansetron Hcl	Ondansetron Hcl	34	28
Ipratropium-Albuterol	Ipratropium/Albuterol Sulfate	33	13
Bumetanide	Bumetanide	32	11
Paroxetine Hcl	Paroxetine Hcl	32	suppressed
Colestipol Hcl	Colestipol Hcl	31	suppressed
Primidone	Primidone	30	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	29	suppressed
Levocarnitine	Levocarnitine (With Sugar)	28	suppressed
Mesalamine Er	Mesalamine	28	suppressed
Tradjenta	Linagliptin	28	suppressed
Irbesartan	Irbesartan	27	suppressed
Glipizide	Glipizide	25	suppressed
Metformin Hcl Er	Metformin Hcl	25	suppressed
Latanoprost	Latanoprost	24	12
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	24	suppressed
Dilantin	Phenytoin Sodium Extended	23	suppressed
Entresto	Sacubitril/Valsartan	23	13
Lamotrigine	Lamotrigine	23	suppressed
Zyprexa	Olanzapine	23	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	22	13
Fludrocortisone Acetate	Fludrocortisone Acetate	22	suppressed
Levocetirizine Dihydrochloride	Levocetirizine Dihydrochloride	22	suppressed
Loperamide	Loperamide Hcl	22	12
Methimazole	Methimazole	22	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	22	suppressed
Chlorthalidone	Chlorthalidone	21	suppressed
Doxycycline Hyclate	Doxycycline Hyclate	21	17
Isosorbide Dinitrate	Isosorbide Dinitrate	21	suppressed
Jardiance	Empagliflozin	21	suppressed
Atropine Sulfate	Atropine Sulfate	20	17
Breo Ellipta	Fluticasone/Vilanterol	20	suppressed
Pravastatin Sodium	Pravastatin Sodium	20	suppressed
Ezetimibe	Ezetimibe	19	suppressed
Solifenacin Succinate	Solifenacin Succinate	19	suppressed
Candesartan Cilexetil	Candesartan Cilexetil	18	suppressed
Metolazone	Metolazone	18	suppressed
Theophylline Er	Theophylline Anhydrous	18	suppressed
Vitamin D2	Ergocalciferol (Vitamin D2)	18	suppressed
Bupropion Xl	Bupropion Hcl	17	suppressed
Fluticasone Propionate	Fluticasone Propionate	17	12
Haloperidol	Haloperidol	17	suppressed
Terazosin Hcl	Terazosin Hcl	17	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	16	suppressed
Meclizine Hcl	Meclizine Hcl	16	suppressed
Clonidine Hcl	Clonidine Hcl	15	suppressed
Fenofibrate	Fenofibrate	15	suppressed
Movantik	Naloxegol Oxalate	15	suppressed
Synthroid	Levothyroxine Sodium	15	suppressed
Abrysvo	Rsv Vacc, Pref A And Pref B/Pf	14	14
Albuterol Sulfate Hfa	Albuterol Sulfate	14	suppressed
Gemfibrozil	Gemfibrozil	14	suppressed
Humalog Kwikpen U-100	Insulin Lispro	14	suppressed
Kapspargo Sprinkle	Metoprolol Succinate	14	suppressed
Roflumilast	Roflumilast	14	suppressed
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	13	suppressed
Diltiazem 12hr Er	Diltiazem Hcl	13	suppressed
Hydroxychloroquine Sulfate	Hydroxychloroquine Sulfate	13	suppressed
Labetalol Hcl	Labetalol Hcl	13	suppressed
Rivastigmine	Rivastigmine	13	suppressed
Baclofen	Baclofen	12	suppressed
Dexamethasone	Dexamethasone	12	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	12	suppressed
Felodipine Er	Felodipine	12	suppressed
Isosorbide Mononitrate	Isosorbide Mononitrate	12	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	12	suppressed
Lidocaine	Lidocaine	12	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	12	suppressed
Tolterodine Tartrate Er	Tolterodine Tartrate	12	suppressed
Torsemide	Torsemide	12	suppressed
Cephalexin	Cephalexin	11	suppressed
Enoxaparin Sodium	Enoxaparin Sodium	11	suppressed
Farxiga	Dapagliflozin Propanediol	11	suppressed
Lubiprostone	Lubiprostone	11	suppressed
Memantine Hcl Er	Memantine Hcl	11	suppressed
Nitrofurantoin	Nitrofurantoin Macrocrystal	11	suppressed
Nystop	Nystatin	11	suppressed
Rivastigmine	Rivastigmine Tartrate	11	suppressed
Sucralfate	Sucralfate	11	suppressed
Warfarin Sodium	Warfarin Sodium	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