Healthcare provider profile · identity verified

Mark R Gundersen, MD

Family Practice · FERGUS FALLS, MN · NPI 1952390106

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
Levothyroxine Sodium	Levothyroxine Sodium	346	80
Atorvastatin Calcium	Atorvastatin Calcium	312	68
Lisinopril	Lisinopril	257	52
Metformin Hcl	Metformin Hcl	257	52
Omeprazole	Omeprazole	244	50
Simvastatin	Simvastatin	236	55
Amlodipine Besylate	Amlodipine Besylate	218	58
Losartan Potassium	Losartan Potassium	202	49
Rosuvastatin Calcium	Rosuvastatin Calcium	196	48
Metoprolol Succinate	Metoprolol Succinate	187	41
Gabapentin	Gabapentin	184	38
Tamsulosin Hcl	Tamsulosin Hcl	156	31
Furosemide	Furosemide	153	34
Alendronate Sodium	Alendronate Sodium	151	31
Hydrochlorothiazide	Hydrochlorothiazide	134	34
Warfarin Sodium	Warfarin Sodium	131	22
Allopurinol	Allopurinol	126	28
Meloxicam	Meloxicam	112	27
Pantoprazole Sodium	Pantoprazole Sodium	104	23
Famotidine	Famotidine	100	13
Pravastatin Sodium	Pravastatin Sodium	96	23
Potassium Chloride	Potassium Chloride	84	15
Metoprolol Tartrate	Metoprolol Tartrate	81	16
Montelukast Sodium	Montelukast Sodium	80	13
Eliquis	Apixaban	74	11
Escitalopram Oxalate	Escitalopram Oxalate	71	13
Fluticasone Propionate	Fluticasone Propionate	68	16
Spironolactone	Spironolactone	64	12
Tramadol Hcl	Tramadol Hcl	64	13
Carvedilol	Carvedilol	62	suppressed
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	57	16
Acetaminophen-Codeine	Acetaminophen With Codeine	55	suppressed
Duloxetine Hcl	Duloxetine Hcl	47	12
Lorazepam	Lorazepam	47	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	45	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	44	11
Zolpidem Tartrate	Zolpidem Tartrate	44	suppressed
Atenolol	Atenolol	42	11
Glipizide	Glipizide	41	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	40	suppressed
Albuterol Sulfate Hfa	Albuterol Sulfate	39	24
Prednisone	Prednisone	39	21
Januvia	Sitagliptin Phosphate	36	suppressed
Sertraline Hcl	Sertraline Hcl	35	suppressed
Glipizide Er	Glipizide	33	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	32	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	31	25
Clopidogrel	Clopidogrel Bisulfate	31	suppressed
Ezetimibe	Ezetimibe	31	suppressed
Ropinirole Hcl	Ropinirole Hcl	31	suppressed
Fluconazole	Fluconazole	29	suppressed
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	29	suppressed
Mirtazapine	Mirtazapine	29	suppressed
Amoxicillin	Amoxicillin	28	24
Benazepril Hcl	Benazepril Hcl	28	suppressed
Metformin Hcl Er	Metformin Hcl	28	suppressed
Cefdinir	Cefdinir	27	20
Citalopram Hbr	Citalopram Hydrobromide	27	suppressed
Jardiance	Empagliflozin	27	suppressed
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	26	suppressed
Fenofibrate	Fenofibrate Nanocrystallized	26	suppressed
Ipratropium Bromide	Ipratropium Bromide	26	suppressed
Meclizine Hcl	Meclizine Hcl	26	suppressed
Jantoven	Warfarin Sodium	25	suppressed
Ozempic	Semaglutide	25	suppressed
Baclofen	Baclofen	23	suppressed
Donepezil Hcl	Donepezil Hcl	23	suppressed
Propranolol Hcl	Propranolol Hcl	23	suppressed
Finasteride	Finasteride	22	suppressed
Chlorhexidine Gluconate	Chlorhexidine Gluconate	21	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	21	suppressed
Gemfibrozil	Gemfibrozil	21	suppressed
Methenamine Hippurate	Methenamine Hippurate	21	suppressed
Carbidopa-Levodopa	Carbidopa/Levodopa	20	suppressed
Clonazepam	Clonazepam	20	suppressed
Clonidine Hcl	Clonidine Hcl	20	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	20	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	20	suppressed
Ventolin Hfa	Albuterol Sulfate	20	12
Alprazolam	Alprazolam	19	suppressed
Bumetanide	Bumetanide	19	suppressed
Sucralfate	Sucralfate	19	suppressed
Glimepiride	Glimepiride	18	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	17	13
Breyna	Budesonide/Formoterol Fumarate	17	suppressed
Ibandronate Sodium	Ibandronate Sodium	17	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	17	11
Oxybutynin Chloride	Oxybutynin Chloride	17	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	17	suppressed
Trazodone Hcl	Trazodone Hcl	17	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	16	suppressed
Enoxaparin Sodium	Enoxaparin Sodium	16	suppressed
Levetiracetam	Levetiracetam	16	suppressed
Levofloxacin	Levofloxacin	16	15
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	16	suppressed
Azithromycin	Azithromycin	15	13
Bydureon Bcise	Exenatide Microspheres	15	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	15	suppressed
Memantine Hcl	Memantine Hcl	15	suppressed
Azelastine Hcl	Azelastine Hcl	14	suppressed
Cephalexin	Cephalexin	14	suppressed
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	14	suppressed
Hydrocortisone	Hydrocortisone	14	suppressed
Novolog Flexpen	Insulin Aspart	14	suppressed
Raloxifene Hcl	Raloxifene Hcl	14	suppressed
Ulticare Pen Needle	Pen Needle, Diabetic	14	suppressed
Vilazodone Hcl	Vilazodone Hcl	14	suppressed
Effexor Xr	Venlafaxine Hcl	13	suppressed
Klor-Con M10	Potassium Chloride	13	suppressed
Methimazole	Methimazole	13	suppressed
Ramipril	Ramipril	13	suppressed
Rivastigmine	Rivastigmine	13	suppressed
Xarelto	Rivaroxaban	13	suppressed
Creon	Lipase/Protease/Amylase	12	suppressed
Dilt-Xr	Diltiazem Hcl	12	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	12	suppressed
Doxycycline Monohydrate	Doxycycline Monohydrate	12	11
Lansoprazole	Lansoprazole	12	suppressed
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	12	suppressed
Nystatin	Nystatin	12	suppressed
Pregabalin	Pregabalin	12	suppressed
Betamethasone Dipropionate	Betamethasone Dipropionate	11	suppressed
Clotrimazole-Betamethasone	Clotrimazole/Betamethasone Dip	11	suppressed
Desoximetasone	Desoximetasone	11	suppressed
Morphine Sulfate Er	Morphine Sulfate	11	suppressed
Nitroglycerin	Nitroglycerin	11	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	11	suppressed
Risperidone	Risperidone	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