Healthcare provider profile · identity verified

Michael Thomas Kalkhoff, MD

Family Practice · SPIRIT LAKE, IA · NPI 1649684325

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	899	227
Omeprazole	Omeprazole	628	151
Furosemide	Furosemide	556	124
Levothyroxine Sodium	Levothyroxine Sodium	537	118
Lisinopril	Lisinopril	533	130
Amlodipine Besylate	Amlodipine Besylate	504	120
Losartan Potassium	Losartan Potassium	502	120
Gabapentin	Gabapentin	421	88
Metoprolol Succinate	Metoprolol Succinate	354	91
Metformin Hcl	Metformin Hcl	315	77
Tamsulosin Hcl	Tamsulosin Hcl	297	72
Eliquis	Apixaban	294	47
Metoprolol Tartrate	Metoprolol Tartrate	294	67
Simvastatin	Simvastatin	293	79
Trazodone Hcl	Trazodone Hcl	224	51
Potassium Chloride	Potassium Chloride	212	45
Meloxicam	Meloxicam	208	60
Rosuvastatin Calcium	Rosuvastatin Calcium	206	57
Tramadol Hcl	Tramadol Hcl	180	45
Ozempic	Semaglutide	163	17
Spironolactone	Spironolactone	161	40
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	159	47
Allopurinol	Allopurinol	154	38
Warfarin Sodium	Warfarin Sodium	154	36
Pantoprazole Sodium	Pantoprazole Sodium	147	36
Duloxetine Hcl	Duloxetine Hcl	144	33
Clopidogrel	Clopidogrel Bisulfate	143	31
Hydrochlorothiazide	Hydrochlorothiazide	141	43
Zolpidem Tartrate	Zolpidem Tartrate	128	30
Fluoxetine Hcl	Fluoxetine Hcl	126	23
Sertraline Hcl	Sertraline Hcl	126	29
Prednisone	Prednisone	122	85
Famotidine	Famotidine	120	34
Pravastatin Sodium	Pravastatin Sodium	114	28
Carvedilol	Carvedilol	100	25
Lorazepam	Lorazepam	98	25
Jantoven	Warfarin Sodium	96	16
Montelukast Sodium	Montelukast Sodium	96	25
Pregabalin	Pregabalin	93	21
Fluticasone Propionate	Fluticasone Propionate	88	26
Albuterol Sulfate Hfa	Albuterol Sulfate	83	30
Finasteride	Finasteride	83	16
Buspirone Hcl	Buspirone Hcl	82	18
Citalopram Hbr	Citalopram Hydrobromide	81	21
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	79	22
Escitalopram Oxalate	Escitalopram Oxalate	79	18
Cephalexin	Cephalexin	78	35
Clonazepam	Clonazepam	77	16
Glipizide Er	Glipizide	76	20
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	74	suppressed
Benazepril Hcl	Benazepril Hcl	73	20
Doxycycline Hyclate	Doxycycline Hyclate	69	55
Atenolol	Atenolol	66	19
Metformin Hcl Er	Metformin Hcl	66	17
Xarelto	Rivaroxaban	63	11
Januvia	Sitagliptin Phosphate	58	11
Bupropion Xl	Bupropion Hcl	56	12
Tizanidine Hcl	Tizanidine Hcl	56	suppressed
Trulicity	Dulaglutide	56	suppressed
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	55	21
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	55	15
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	54	suppressed
Ropinirole Hcl	Ropinirole Hcl	51	13
Amitriptyline Hcl	Amitriptyline Hcl	50	12
Sumatriptan Succinate	Sumatriptan Succinate	50	suppressed
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	49	16
Anoro Ellipta	Umeclidinium Brm/Vilanterol Tr	47	suppressed
Donepezil Hcl	Donepezil Hcl	47	12
Azithromycin	Azithromycin	46	40
Triamcinolone Acetonide	Triamcinolone Acetonide	44	31
Jardiance	Empagliflozin	43	suppressed
Nystatin	Nystatin	43	18
Ezetimibe	Ezetimibe	42	suppressed
Digoxin	Digoxin	41	12
Aripiprazole	Aripiprazole	40	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	40	suppressed
Novolog Mix 70-30 Flexpen	Insulin Aspart Prot/Insuln Asp	40	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	40	suppressed
Alendronate Sodium	Alendronate Sodium	39	11
Doxazosin Mesylate	Doxazosin Mesylate	38	12
Fentanyl	Fentanyl	38	suppressed
Primidone	Primidone	38	suppressed
Lamotrigine	Lamotrigine	37	suppressed
Memantine Hcl	Memantine Hcl	37	suppressed
Humalog Kwikpen U-100	Insulin Lispro	36	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	36	11
Valsartan	Valsartan	36	suppressed
Baclofen	Baclofen	35	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	34	24
Mirtazapine	Mirtazapine	34	11
Venlafaxine Hcl Er	Venlafaxine Hcl	34	suppressed
Enalapril Maleate	Enalapril Maleate	33	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	33	suppressed
Propranolol Hcl	Propranolol Hcl	33	suppressed
Sucralfate	Sucralfate	33	suppressed
Lantus	Insulin Glargine,hum.Rec.Anlog	32	suppressed
Ondansetron Hcl	Ondansetron Hcl	32	24
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	32	suppressed
Ipratropium Bromide	Ipratropium Bromide	31	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	30	26
Oxycodone Hcl	Oxycodone Hcl	30	suppressed
Propranolol Hcl Er	Propranolol Hcl	30	suppressed
Topiramate	Topiramate	30	suppressed
Gemfibrozil	Gemfibrozil	29	suppressed
Levetiracetam	Levetiracetam	29	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	29	suppressed
Valacyclovir	Valacyclovir Hcl	29	13
Carbamazepine Er	Carbamazepine	28	suppressed
Fluconazole	Fluconazole	28	16
Isosorbide Mononitrate Er	Isosorbide Mononitrate	28	suppressed
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	28	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	27	suppressed
Mounjaro	Tirzepatide	27	suppressed
Chlorthalidone	Chlorthalidone	26	suppressed
Glipizide	Glipizide	26	suppressed
Alprazolam	Alprazolam	25	11
Insulin Syringe	Syringe-Needle,insulin,0.5 Ml	25	suppressed
Solifenacin Succinate	Solifenacin Succinate	25	suppressed
Ulticare Pen Needle	Pen Needle, Diabetic	25	suppressed
Ultra-Fine Nano Pen Needle	Pen Needle, Diabetic	25	suppressed
Labetalol Hcl	Labetalol Hcl	24	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	24	suppressed
Torsemide	Torsemide	24	suppressed
Xifaxan	Rifaximin	23	suppressed
Diclofenac Sodium	Diclofenac Sodium	22	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	22	suppressed
Eszopiclone	Eszopiclone	22	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	22	suppressed
Fenofibrate	Fenofibrate	21	suppressed
Nortriptyline Hcl	Nortriptyline Hcl	21	suppressed
Lovastatin	Lovastatin	20	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	20	19
Synthroid	Levothyroxine Sodium	20	suppressed
Temazepam	Temazepam	20	suppressed
Terbinafine Hcl	Terbinafine Hcl	20	suppressed
Amoxicillin	Amoxicillin	19	13
Clotrimazole-Betamethasone	Clotrimazole/Betamethasone Dip	19	13
Fiasp Flextouch	Insulin Aspart (Niacinamide)	19	suppressed
Loperamide	Loperamide Hcl	19	suppressed
Nitroglycerin	Nitroglycerin	19	16
Novolog Flexpen	Insulin Aspart	19	suppressed
Amiodarone Hcl	Amiodarone Hcl	18	suppressed
Cholestyramine Light	Cholestyramine	18	suppressed
Latanoprost	Latanoprost	18	suppressed
Levemir Flexpen	Insulin Detemir	18	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	18	suppressed
Risperidone	Risperidone	18	suppressed
Bumetanide	Bumetanide	17	suppressed
Bupropion Hcl Sr	Bupropion Hcl	17	suppressed
Carbidopa-Levodopa	Carbidopa/Levodopa	17	suppressed
Cefdinir	Cefdinir	17	16
Cholestyramine	Cholestyramine (With Sugar)	17	suppressed
Farxiga	Dapagliflozin Propanediol	17	suppressed
Ibuprofen	Ibuprofen	17	suppressed
Clobetasol Propionate	Clobetasol Propionate	16	suppressed
Novolog Mix 70-30	Insulin Aspart Prot/Insuln Asp	16	suppressed
Glimepiride	Glimepiride	15	suppressed
Irbesartan	Irbesartan	15	suppressed
Methenamine Hippurate	Methenamine Hippurate	15	suppressed
Myrbetriq	Mirabegron	15	suppressed
Ultra-Fine Mini Pen Needle	Pen Needle, Diabetic	15	suppressed
Fludrocortisone Acetate	Fludrocortisone Acetate	14	suppressed
Levofloxacin	Levofloxacin	14	suppressed
Naproxen	Naproxen	14	suppressed
Novolin R Flexpen	Insulin Regular, Human	14	suppressed
Ventolin Hfa	Albuterol Sulfate	14	suppressed
Advair Hfa	Fluticasone Propion/Salmeterol	13	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	13	suppressed
Breo Ellipta	Fluticasone/Vilanterol	13	suppressed
Humalog Mix 75-25 Kwikpen	Insulin Lispro Protamin/Lispro	13	suppressed
Insulin Lispro Protamine Mix	Insulin Lispro Protamin/Lispro	13	suppressed
Memantine Hcl Er	Memantine Hcl	13	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	13	suppressed
Spiriva Respimat	Tiotropium Bromide	13	suppressed
Telmisartan	Telmisartan	13	suppressed
Alphagan P	Brimonidine Tartrate	12	suppressed
Benztropine Mesylate	Benztropine Mesylate	12	suppressed
Insulin Lispro Kwikpen U-100	Insulin Lispro	12	suppressed
Insulin Syringe	Syringe And Needle,insulin,1ml	12	suppressed
Lidocaine	Lidocaine	12	suppressed
Metoclopramide Hcl	Metoclopramide Hcl	12	suppressed
Mupirocin	Mupirocin	12	suppressed
Novolin 70-30 Flexpen	Insulin Nph Hum/Reg Insulin Hm	12	suppressed
Olanzapine	Olanzapine	12	suppressed
Prempro	Estrogen,con/M-Progest Acet	12	suppressed
Rytary	Carbidopa/Levodopa	12	suppressed
Tramadol Hcl Er	Tramadol Hcl	12	suppressed
Bethanechol Chloride	Bethanechol Chloride	11	suppressed
Dextroamphetamine-Amphet Er	Dextroamphetamine/Amphetamine	11	suppressed
Flecainide Acetate	Flecainide Acetate	11	suppressed
Incruse Ellipta	Umeclidinium Bromide	11	suppressed
Sure Comfort Pen Needle	Pen Needle, Diabetic	11	suppressed
Verapamil Er	Verapamil Hcl	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