Healthcare provider profile · identity verified

John Gregory Amspaugh, MD

Family Practice · JOHNSTON, IA · NPI 1588647820

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	477	129
Levothyroxine Sodium	Levothyroxine Sodium	290	71
Rosuvastatin Calcium	Rosuvastatin Calcium	246	76
Lisinopril	Lisinopril	180	51
Amlodipine Besylate	Amlodipine Besylate	175	50
Ozempic	Semaglutide	132	19
Metoprolol Succinate	Metoprolol Succinate	123	32
Omeprazole	Omeprazole	123	38
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	120	39
Metformin Hcl	Metformin Hcl	118	32
Tamsulosin Hcl	Tamsulosin Hcl	118	36
Trazodone Hcl	Trazodone Hcl	115	27
Meloxicam	Meloxicam	113	40
Alprazolam	Alprazolam	108	19
Losartan Potassium	Losartan Potassium	105	29
Simvastatin	Simvastatin	104	32
Metformin Hcl Er	Metformin Hcl	87	23
Hydrochlorothiazide	Hydrochlorothiazide	83	25
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	75	27
Escitalopram Oxalate	Escitalopram Oxalate	74	26
Finasteride	Finasteride	70	20
Prednisone	Prednisone	66	50
Allopurinol	Allopurinol	59	18
Atenolol	Atenolol	58	16
Gabapentin	Gabapentin	58	17
Metoprolol Tartrate	Metoprolol Tartrate	58	15
Furosemide	Furosemide	57	17
Montelukast Sodium	Montelukast Sodium	55	17
Pantoprazole Sodium	Pantoprazole Sodium	55	16
Citalopram Hbr	Citalopram Hydrobromide	52	18
Eliquis	Apixaban	52	12
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	49	14
Albuterol Sulfate Hfa	Albuterol Sulfate	47	21
Sertraline Hcl	Sertraline Hcl	47	11
Tizanidine Hcl	Tizanidine Hcl	45	17
Fluoxetine Hcl	Fluoxetine Hcl	42	suppressed
Fluticasone Propionate	Fluticasone Propionate	42	13
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	41	12
Tramadol Hcl	Tramadol Hcl	40	12
Benazepril Hcl	Benazepril Hcl	37	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	36	suppressed
Clonazepam	Clonazepam	35	suppressed
Potassium Chloride	Potassium Chloride	35	11
Glimepiride	Glimepiride	34	11
Spironolactone	Spironolactone	34	suppressed
Alendronate Sodium	Alendronate Sodium	33	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	33	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	33	13
Diclofenac Sodium	Diclofenac Sodium	32	11
Venlafaxine Hcl Er	Venlafaxine Hcl	32	suppressed
Lorazepam	Lorazepam	30	12
Mirtazapine	Mirtazapine	30	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	30	suppressed
Duloxetine Hcl	Duloxetine Hcl	28	suppressed
Mounjaro	Tirzepatide	28	suppressed
Famotidine	Famotidine	27	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	27	14
Bupropion Xl	Bupropion Hcl	26	suppressed
Sildenafil Citrate	Sildenafil Citrate	26	suppressed
Amoxicillin	Amoxicillin	25	suppressed
Carvedilol	Carvedilol	25	suppressed
Clopidogrel	Clopidogrel Bisulfate	25	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	25	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	25	suppressed
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	25	suppressed
Dextroamphetamine-Amphetamine	Dextroamphetamine/Amphetamine	24	suppressed
Estradiol	Estradiol	24	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	24	suppressed
Azithromycin	Azithromycin	23	21
Doxycycline Monohydrate	Doxycycline Monohydrate	23	13
Fluconazole	Fluconazole	23	11
Donepezil Hcl	Donepezil Hcl	22	suppressed
Pravastatin Sodium	Pravastatin Sodium	21	suppressed
Terazosin Hcl	Terazosin Hcl	21	suppressed
Solifenacin Succinate	Solifenacin Succinate	20	suppressed
Atenolol-Chlorthalidone	Atenolol/Chlorthalidone	19	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	19	suppressed
Naproxen	Naproxen	19	suppressed
Oxycodone Hcl	Oxycodone Hcl	19	suppressed
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	18	suppressed
Spiriva Respimat	Tiotropium Bromide	18	suppressed
Synthroid	Levothyroxine Sodium	17	suppressed
Temazepam	Temazepam	17	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	17	14
Xarelto	Rivaroxaban	17	suppressed
Memantine Hcl	Memantine Hcl	16	suppressed
Ropinirole Hcl	Ropinirole Hcl	16	suppressed
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	16	suppressed
Bupropion Hcl Sr	Bupropion Hcl	15	suppressed
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	15	suppressed
Acyclovir	Acyclovir	14	suppressed
Bisoprolol-Hydrochlorothiazide	Bisoprolol/Hydrochlorothiazide	14	suppressed
Breo Ellipta	Fluticasone/Vilanterol	14	suppressed
Pregabalin	Pregabalin	14	suppressed
Tresiba Flextouch U-200	Insulin Degludec	14	suppressed
Chlorthalidone	Chlorthalidone	13	suppressed
Doxepin Hcl	Doxepin Hcl	13	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	13	suppressed
Nystatin	Nystatin	13	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	13	suppressed
Warfarin Sodium	Warfarin Sodium	13	suppressed
Cephalexin	Cephalexin	12	suppressed
Cholestyramine	Cholestyramine (With Sugar)	12	suppressed
Clonidine Hcl	Clonidine Hcl	12	suppressed
Nortriptyline Hcl	Nortriptyline Hcl	12	suppressed
Promethazine Hcl	Promethazine Hcl	12	suppressed
Valacyclovir	Valacyclovir Hcl	12	suppressed
Buspirone Hcl	Buspirone Hcl	11	suppressed
Clotrimazole-Betamethasone	Clotrimazole/Betamethasone Dip	11	suppressed
Fenofibrate	Fenofibrate	11	suppressed
Insulin Lispro Kwikpen U-100	Insulin Lispro	11	suppressed
Levetiracetam	Levetiracetam	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