Healthcare provider profile · identity verified

Kenneth Thomas Chapman, MD

Family Practice · STORM LAKE, IA · NPI 1033747365

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	330	100
Simvastatin	Simvastatin	296	84
Lisinopril	Lisinopril	273	87
Amlodipine Besylate	Amlodipine Besylate	224	81
Levothyroxine Sodium	Levothyroxine Sodium	215	66
Metoprolol Succinate	Metoprolol Succinate	208	55
Jardiance	Empagliflozin	207	47
Metformin Hcl	Metformin Hcl	173	51
Omeprazole	Omeprazole	161	52
Tamsulosin Hcl	Tamsulosin Hcl	158	47
Furosemide	Furosemide	132	36
Trazodone Hcl	Trazodone Hcl	127	37
Gabapentin	Gabapentin	121	30
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	111	19
Losartan Potassium	Losartan Potassium	105	36
Ozempic	Semaglutide	105	20
Allopurinol	Allopurinol	88	26
Albuterol Sulfate Hfa	Albuterol Sulfate	87	40
Potassium Chloride	Potassium Chloride	84	31
Nifedipine Er	Nifedipine	82	25
Spironolactone	Spironolactone	74	20
Clopidogrel	Clopidogrel Bisulfate	73	25
Eliquis	Apixaban	71	19
Warfarin Sodium	Warfarin Sodium	66	11
Prednisone	Prednisone	64	51
Hydrochlorothiazide	Hydrochlorothiazide	63	21
Pantoprazole Sodium	Pantoprazole Sodium	61	18
Glipizide Er	Glipizide	59	19
Rosuvastatin Calcium	Rosuvastatin Calcium	58	18
Meclizine Hcl	Meclizine Hcl	57	11
Metoprolol Tartrate	Metoprolol Tartrate	57	20
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	55	suppressed
Metformin Hcl Er	Metformin Hcl	53	23
Meloxicam	Meloxicam	51	15
Ipratropium-Albuterol	Ipratropium/Albuterol Sulfate	47	suppressed
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	46	30
Novolog Flexpen	Insulin Aspart	44	suppressed
Duloxetine Hcl	Duloxetine Hcl	43	12
Farxiga	Dapagliflozin Propanediol	40	suppressed
Pregabalin	Pregabalin	40	suppressed
Fluticasone Propionate	Fluticasone Propionate	39	21
Benazepril Hcl	Benazepril Hcl	38	suppressed
Bumetanide	Bumetanide	38	suppressed
Clonidine Hcl	Clonidine Hcl	38	11
Ezetimibe	Ezetimibe	38	suppressed
Montelukast Sodium	Montelukast Sodium	37	11
Januvia	Sitagliptin Phosphate	36	suppressed
Carvedilol	Carvedilol	35	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	34	29
Pravastatin Sodium	Pravastatin Sodium	34	11
Triamcinolone Acetonide	Triamcinolone Acetonide	34	13
Oxybutynin Chloride Er	Oxybutynin Chloride	33	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	32	12
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	32	suppressed
Doxycycline Hyclate	Doxycycline Hyclate	31	31
Fluoxetine Hcl	Fluoxetine Hcl	31	suppressed
Levofloxacin	Levofloxacin	31	23
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	31	suppressed
Buspirone Hcl	Buspirone Hcl	29	suppressed
Citalopram Hbr	Citalopram Hydrobromide	29	suppressed
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	29	suppressed
Azithromycin	Azithromycin	28	26
Famotidine	Famotidine	28	11
Latanoprost	Latanoprost	28	suppressed
Mounjaro	Tirzepatide	28	suppressed
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	27	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	27	suppressed
Xarelto	Rivaroxaban	27	suppressed
Alendronate Sodium	Alendronate Sodium	26	12
Donepezil Hcl	Donepezil Hcl	26	suppressed
Tresiba Flextouch U-200	Insulin Degludec	24	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	23	17
Ultra-Fine Mini Pen Needle	Pen Needle, Diabetic	23	suppressed
Fluconazole	Fluconazole	21	15
Hydralazine Hcl	Hydralazine Hcl	21	suppressed
Ventolin Hfa	Albuterol Sulfate	21	suppressed
Breo Ellipta	Fluticasone/Vilanterol	19	suppressed
Symbicort	Budesonide/Formoterol Fumarate	19	suppressed
Celecoxib	Celecoxib	18	11
Clotrimazole-Betamethasone	Clotrimazole/Betamethasone Dip	18	suppressed
Loperamide	Loperamide Hcl	18	suppressed
Lorazepam	Lorazepam	18	suppressed
Olanzapine	Olanzapine	18	suppressed
Sucralfate	Sucralfate	18	suppressed
Ondansetron Hcl	Ondansetron Hcl	17	11
Sertraline Hcl	Sertraline Hcl	17	suppressed
Toujeo Max Solostar	Insulin Glargine,hum.Rec.Anlog	16	suppressed
Glipizide	Glipizide	15	suppressed
Metoclopramide Hcl	Metoclopramide Hcl	15	suppressed
Tramadol Hcl	Tramadol Hcl	15	suppressed
Atenolol	Atenolol	14	suppressed
Brilinta	Ticagrelor	14	suppressed
Bupropion Xl	Bupropion Hcl	14	suppressed
Clindamycin Hcl	Clindamycin Hcl	14	11
Dicyclomine Hcl	Dicyclomine Hcl	14	suppressed
Escitalopram Oxalate	Escitalopram Oxalate	14	suppressed
Humalog Kwikpen U-100	Insulin Lispro	14	suppressed
Hydrocortisone	Hydrocortisone	14	suppressed
Nyamyc	Nystatin	14	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	14	suppressed
Carbamazepine	Carbamazepine	13	suppressed
Clonidine	Clonidine	13	suppressed
Hydroxychloroquine Sulfate	Hydroxychloroquine Sulfate	13	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	13	suppressed
Nabumetone	Nabumetone	13	suppressed
Timolol Maleate	Timolol Maleate	13	suppressed
Albuterol Sulfate	Albuterol Sulfate	12	suppressed
Doxycycline Monohydrate	Doxycycline Monohydrate	12	suppressed
Gemfibrozil	Gemfibrozil	12	suppressed
Incruse Ellipta	Umeclidinium Bromide	12	suppressed
Levemir Flexpen	Insulin Detemir	12	suppressed
Lovastatin	Lovastatin	12	suppressed
Naproxen	Naproxen	12	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	12	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	12	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	11	suppressed
Benazepril-Hydrochlorothiazide	Benazepril/Hydrochlorothiazide	11	suppressed
Budesonide-Formoterol Fumarate	Budesonide/Formoterol Fumarate	11	suppressed
Bupropion Hcl Sr	Bupropion Hcl	11	suppressed
Carbidopa-Levodopa	Carbidopa/Levodopa	11	suppressed
Dilt-Xr	Diltiazem Hcl	11	suppressed
Dutasteride	Dutasteride	11	suppressed
Linzess	Linaclotide	11	suppressed
Methylphenidate Hcl	Methylphenidate Hcl	11	suppressed
Propranolol Hcl	Propranolol Hcl	11	suppressed
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	11	suppressed
Trueplus Pen Needle	Pen Needle, Diabetic	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