Healthcare provider profile · identity verified

William W Chase, MD

Family Practice · NORWALK, IA · NPI 1841259504

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	631	171
Levothyroxine Sodium	Levothyroxine Sodium	340	84
Amlodipine Besylate	Amlodipine Besylate	318	77
Metformin Hcl	Metformin Hcl	293	80
Simvastatin	Simvastatin	279	74
Lisinopril	Lisinopril	273	71
Metoprolol Succinate	Metoprolol Succinate	202	53
Omeprazole	Omeprazole	195	54
Hydrochlorothiazide	Hydrochlorothiazide	185	50
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	184	51
Glimepiride	Glimepiride	175	39
Losartan Potassium	Losartan Potassium	170	50
Tamsulosin Hcl	Tamsulosin Hcl	167	46
Allopurinol	Allopurinol	142	33
Escitalopram Oxalate	Escitalopram Oxalate	140	36
Tramadol Hcl	Tramadol Hcl	132	28
Pantoprazole Sodium	Pantoprazole Sodium	123	37
Furosemide	Furosemide	112	31
Clonazepam	Clonazepam	110	19
Gabapentin	Gabapentin	110	30
Eliquis	Apixaban	107	16
Albuterol Sulfate Hfa	Albuterol Sulfate	106	37
Jardiance	Empagliflozin	106	26
Warfarin Sodium	Warfarin Sodium	100	15
Rosuvastatin Calcium	Rosuvastatin Calcium	98	26
Metoprolol Tartrate	Metoprolol Tartrate	90	22
Ozempic	Semaglutide	85	22
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	81	21
Prednisone	Prednisone	80	58
Pravastatin Sodium	Pravastatin Sodium	76	20
Metformin Hcl Er	Metformin Hcl	67	14
Bupropion Xl	Bupropion Hcl	66	14
Citalopram Hbr	Citalopram Hydrobromide	65	15
Trazodone Hcl	Trazodone Hcl	64	19
Clonidine Hcl	Clonidine Hcl	59	12
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	58	25
Donepezil Hcl	Donepezil Hcl	57	11
Zolpidem Tartrate	Zolpidem Tartrate	56	13
Alendronate Sodium	Alendronate Sodium	52	14
Meloxicam	Meloxicam	52	16
Montelukast Sodium	Montelukast Sodium	51	13
Carvedilol	Carvedilol	50	13
Oxycodone Hcl	Oxycodone Hcl	49	suppressed
Sertraline Hcl	Sertraline Hcl	49	15
Atenolol	Atenolol	48	13
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	46	13
Benazepril Hcl	Benazepril Hcl	44	12
Pregabalin	Pregabalin	43	suppressed
Lorazepam	Lorazepam	42	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	41	14
Mirtazapine	Mirtazapine	41	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	40	29
Finasteride	Finasteride	39	suppressed
Doxycycline Hyclate	Doxycycline Hyclate	36	33
Enalapril Maleate	Enalapril Maleate	36	suppressed
Glipizide	Glipizide	35	suppressed
Paroxetine Hcl	Paroxetine Hcl	35	suppressed
Potassium Chloride	Potassium Chloride	35	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	34	suppressed
Mounjaro	Tirzepatide	34	suppressed
Valacyclovir	Valacyclovir Hcl	33	11
Xarelto	Rivaroxaban	33	suppressed
Diclofenac Sodium	Diclofenac Sodium	32	11
Memantine Hcl	Memantine Hcl	32	suppressed
Clopidogrel	Clopidogrel Bisulfate	30	suppressed
Synthroid	Levothyroxine Sodium	29	suppressed
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	29	suppressed
Famotidine	Famotidine	28	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	28	suppressed
Valsartan	Valsartan	28	suppressed
Alprazolam	Alprazolam	27	suppressed
Testosterone Cypionate	Testosterone Cypionate	27	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	26	suppressed
Testosterone	Testosterone	26	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	25	suppressed
Breo Ellipta	Fluticasone/Vilanterol	24	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	24	suppressed
Duloxetine Hcl	Duloxetine Hcl	24	suppressed
Ezetimibe	Ezetimibe	24	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	23	21
Olmesartan Medoxomil	Olmesartan Medoxomil	22	suppressed
Amoxicillin	Amoxicillin	21	15
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	21	suppressed
Fluticasone Propionate	Fluticasone Propionate	21	suppressed
Buspirone Hcl	Buspirone Hcl	20	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	20	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	19	suppressed
Celecoxib	Celecoxib	19	suppressed
Glyburide	Glyburide	19	suppressed
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	19	suppressed
Baclofen	Baclofen	17	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	17	suppressed
Gemfibrozil	Gemfibrozil	17	suppressed
Ventolin Hfa	Albuterol Sulfate	17	suppressed
Fenofibrate	Fenofibrate	16	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	16	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	16	suppressed
Spironolactone	Spironolactone	16	suppressed
Lovastatin	Lovastatin	15	suppressed
Naproxen	Naproxen	15	suppressed
Nystatin	Nystatin	15	suppressed
Tizanidine Hcl	Tizanidine Hcl	15	suppressed
Nebivolol Hcl	Nebivolol Hcl	14	suppressed
Hydralazine Hcl	Hydralazine Hcl	13	suppressed
Methylphenidate Er	Methylphenidate Hcl	13	suppressed
Propranolol Hcl	Propranolol Hcl	13	suppressed
Ropinirole Hcl	Ropinirole Hcl	13	suppressed
Azithromycin	Azithromycin	12	11
Butalbital-Acetaminophen-Caffe	Butalb/Acetaminophen/Caffeine	12	suppressed
Folic Acid	Folic Acid	12	suppressed
Hydroxyzine Pamoate	Hydroxyzine Pamoate	12	suppressed
Nexium	Esomeprazole Magnesium	12	suppressed
Toujeo Solostar	Insulin Glargine,hum.Rec.Anlog	12	suppressed
Clobetasol Propionate	Clobetasol Propionate	11	suppressed
Combivent Respimat	Ipratropium/Albuterol Sulfate	11	suppressed
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	11	suppressed
Propranolol Hcl Er	Propranolol Hcl	11	suppressed
Sucralfate	Sucralfate	11	suppressed
Tramadol Hcl Er	Tramadol 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