Healthcare provider profile · identity verified

Clarence D Engstrom, MD

Family Practice · ZION, IL · NPI 1356327514

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	529	146
Metformin Hcl	Metformin Hcl	283	75
Amlodipine Besylate	Amlodipine Besylate	281	75
Lisinopril	Lisinopril	222	61
Gabapentin	Gabapentin	190	41
Hydrochlorothiazide	Hydrochlorothiazide	175	49
Metoprolol Succinate	Metoprolol Succinate	160	38
Tamsulosin Hcl	Tamsulosin Hcl	156	33
Losartan Potassium	Losartan Potassium	143	40
Levothyroxine Sodium	Levothyroxine Sodium	132	34
Furosemide	Furosemide	126	31
Jardiance	Empagliflozin	113	25
Potassium Chloride	Potassium Chloride	108	21
Metoprolol Tartrate	Metoprolol Tartrate	106	32
Pantoprazole Sodium	Pantoprazole Sodium	106	28
Omeprazole	Omeprazole	102	33
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	99	24
Glipizide	Glipizide	96	26
Trulicity	Dulaglutide	94	11
Simvastatin	Simvastatin	92	26
Sertraline Hcl	Sertraline Hcl	83	22
Pravastatin Sodium	Pravastatin Sodium	82	24
Spironolactone	Spironolactone	76	15
Tramadol Hcl	Tramadol Hcl	71	20
Lorazepam	Lorazepam	67	16
Albuterol Sulfate Hfa	Albuterol Sulfate	66	20
Pioglitazone Hcl	Pioglitazone Hcl	66	15
Chlorthalidone	Chlorthalidone	61	18
Allopurinol	Allopurinol	58	15
Clopidogrel	Clopidogrel Bisulfate	56	15
Zolpidem Tartrate	Zolpidem Tartrate	54	suppressed
Meloxicam	Meloxicam	51	15
Rosuvastatin Calcium	Rosuvastatin Calcium	48	15
Doxycycline Hyclate	Doxycycline Hyclate	44	33
Ezetimibe	Ezetimibe	42	suppressed
Trazodone Hcl	Trazodone Hcl	42	13
Alendronate Sodium	Alendronate Sodium	39	suppressed
Ozempic	Semaglutide	39	suppressed
Memantine Hcl	Memantine Hcl	38	suppressed
Clonazepam	Clonazepam	37	suppressed
Montelukast Sodium	Montelukast Sodium	35	suppressed
Carvedilol	Carvedilol	34	11
Escitalopram Oxalate	Escitalopram Oxalate	34	suppressed
Buspirone Hcl	Buspirone Hcl	32	suppressed
Duloxetine Hcl	Duloxetine Hcl	31	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	29	suppressed
Eliquis	Apixaban	27	suppressed
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	27	12
Alprazolam	Alprazolam	26	suppressed
Glimepiride	Glimepiride	26	suppressed
Prednisone	Prednisone	26	16
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	26	suppressed
Donepezil Hcl	Donepezil Hcl	25	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	25	suppressed
Humulin N	Insulin Nph Human Isophane	23	suppressed
Ibuprofen	Ibuprofen	23	suppressed
Meclizine Hcl	Meclizine Hcl	23	12
Metformin Hcl Er	Metformin Hcl	23	suppressed
Symbicort	Budesonide/Formoterol Fumarate	23	suppressed
Warfarin Sodium	Warfarin Sodium	23	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	22	20
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	21	suppressed
Irbesartan	Irbesartan	21	suppressed
Ropinirole Hcl	Ropinirole Hcl	21	suppressed
Butalbital-Acetaminophen-Caffe	Butalb/Acetaminophen/Caffeine	19	suppressed
Lovastatin	Lovastatin	19	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	19	suppressed
Clonidine Hcl	Clonidine Hcl	18	suppressed
Humalog	Insulin Lispro	18	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	18	suppressed
Metolazone	Metolazone	18	suppressed
Propranolol Hcl	Propranolol Hcl	18	suppressed
Terazosin Hcl	Terazosin Hcl	18	suppressed
Xarelto	Rivaroxaban	18	suppressed
Dextroamphetamine-Amphetamine	Dextroamphetamine/Amphetamine	17	suppressed
Doxepin Hcl	Doxepin Hcl	17	suppressed
Primidone	Primidone	17	suppressed
Sildenafil Citrate	Sildenafil Citrate	16	suppressed
Finasteride	Finasteride	15	suppressed
Januvia	Sitagliptin Phosphate	15	suppressed
Klor-Con M10	Potassium Chloride	15	suppressed
Lansoprazole	Lansoprazole	15	suppressed
Mometasone Furoate	Mometasone Furoate	15	suppressed
Venlafaxine Hcl	Venlafaxine Hcl	15	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	15	suppressed
Baclofen	Baclofen	14	suppressed
Spiriva Respimat	Tiotropium Bromide	14	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	13	12
Atenolol	Atenolol	13	suppressed
Famotidine	Famotidine	13	suppressed
Fenofibrate	Fenofibrate Nanocrystallized	13	suppressed
Paroxetine Hcl	Paroxetine Hcl	13	suppressed
Carisoprodol	Carisoprodol	12	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	12	suppressed
Citalopram Hbr	Citalopram Hydrobromide	12	suppressed
Dextroamphetamine-Amphet Er	Dextroamphetamine/Amphetamine	12	suppressed
Droplet Pen Needle	Pen Needle, Diabetic	12	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	12	suppressed
Humalog Kwikpen U-100	Insulin Lispro	12	suppressed
Imipramine Hcl	Imipramine Hcl	12	suppressed
Methylphenidate Hcl	Methylphenidate Hcl	12	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	12	suppressed
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	12	suppressed
Ritalin	Methylphenidate Hcl	12	suppressed
Serevent Diskus	Salmeterol Xinafoate	12	suppressed
Benazepril Hcl	Benazepril Hcl	11	suppressed
Combivent Respimat	Ipratropium/Albuterol Sulfate	11	suppressed
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	11	suppressed
Humulin 70/30 Kwikpen	Insulin Nph Hum/Reg Insulin Hm	11	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	11	suppressed
Nifedipine Er	Nifedipine	11	suppressed
Synthroid	Levothyroxine Sodium	11	suppressed
Tegretol	Carbamazepine	11	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	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