Healthcare provider profile · identity verified

Seng M Leong, MD

Internal Medicine · BARRINGTON, IL · NPI 1487750790

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	1050	298
Amlodipine Besylate	Amlodipine Besylate	876	253
Losartan Potassium	Losartan Potassium	537	157
Levothyroxine Sodium	Levothyroxine Sodium	535	138
Metoprolol Succinate	Metoprolol Succinate	515	145
Lisinopril	Lisinopril	424	120
Omeprazole	Omeprazole	361	120
Hydrochlorothiazide	Hydrochlorothiazide	352	117
Metoprolol Tartrate	Metoprolol Tartrate	326	80
Metformin Hcl	Metformin Hcl	296	90
Tamsulosin Hcl	Tamsulosin Hcl	295	91
Gabapentin	Gabapentin	285	85
Zolpidem Tartrate	Zolpidem Tartrate	226	49
Atenolol	Atenolol	225	59
Furosemide	Furosemide	224	72
Potassium Chloride	Potassium Chloride	212	71
Azithromycin	Azithromycin	193	157
Pantoprazole Sodium	Pantoprazole Sodium	191	65
Rosuvastatin Calcium	Rosuvastatin Calcium	188	55
Sertraline Hcl	Sertraline Hcl	186	51
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	173	37
Alprazolam	Alprazolam	169	47
Hydralazine Hcl	Hydralazine Hcl	167	54
Allopurinol	Allopurinol	162	45
Lorazepam	Lorazepam	152	32
Simvastatin	Simvastatin	150	42
Valsartan	Valsartan	145	39
Pravastatin Sodium	Pravastatin Sodium	144	41
Eliquis	Apixaban	138	45
Glimepiride	Glimepiride	136	35
Tramadol Hcl	Tramadol Hcl	133	30
Meloxicam	Meloxicam	128	47
Clonazepam	Clonazepam	126	21
Fluticasone Propionate	Fluticasone Propionate	121	49
Albuterol Sulfate Hfa	Albuterol Sulfate	119	54
Alendronate Sodium	Alendronate Sodium	116	36
Famotidine	Famotidine	113	40
Escitalopram Oxalate	Escitalopram Oxalate	111	39
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	108	29
Bupropion Xl	Bupropion Hcl	105	30
Breo Ellipta	Fluticasone/Vilanterol	101	18
Donepezil Hcl	Donepezil Hcl	100	35
Triamcinolone Acetonide	Triamcinolone Acetonide	94	59
Clopidogrel	Clopidogrel Bisulfate	89	28
Mounjaro	Tirzepatide	87	15
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	86	64
Warfarin Sodium	Warfarin Sodium	84	19
Ozempic	Semaglutide	82	15
Carvedilol	Carvedilol	81	23
Metformin Hcl Er	Metformin Hcl	80	24
Celecoxib	Celecoxib	78	16
Ezetimibe	Ezetimibe	72	23
Finasteride	Finasteride	72	22
Methylprednisolone	Methylprednisolone	72	63
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	72	19
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	71	21
Jardiance	Empagliflozin	70	16
Trulicity	Dulaglutide	69	14
Bumetanide	Bumetanide	67	13
Irbesartan	Irbesartan	67	19
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	62	19
Cephalexin	Cephalexin	59	50
Spironolactone	Spironolactone	57	17
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	57	18
Glipizide Er	Glipizide	56	16
Ondansetron Odt	Ondansetron	56	27
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	53	42
Terazosin Hcl	Terazosin Hcl	53	13
Venlafaxine Hcl Er	Venlafaxine Hcl	53	12
Xarelto	Rivaroxaban	52	suppressed
Trazodone Hcl	Trazodone Hcl	49	18
Diazepam	Diazepam	47	suppressed
Benazepril Hcl	Benazepril Hcl	45	14
Montelukast Sodium	Montelukast Sodium	45	17
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	44	12
Meclizine Hcl	Meclizine Hcl	44	22
Lovastatin	Lovastatin	43	12
Synthroid	Levothyroxine Sodium	43	12
Dicyclomine Hcl	Dicyclomine Hcl	42	15
Propranolol Hcl	Propranolol Hcl	42	12
Amoxicillin	Amoxicillin	40	31
Duloxetine Hcl	Duloxetine Hcl	40	15
Hydrocortisone	Hydrocortisone	40	12
Paxlovid	Nirmatrelvir/Ritonavir	40	40
Propranolol Hcl Er	Propranolol Hcl	39	11
Clonidine Hcl	Clonidine Hcl	36	suppressed
Azelastine Hcl	Azelastine Hcl	34	13
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	34	11
Glipizide	Glipizide	34	11
Ventolin Hfa	Albuterol Sulfate	34	suppressed
Nifedipine Er	Nifedipine	33	suppressed
Citalopram Hbr	Citalopram Hydrobromide	32	suppressed
Potassium Citrate Er	Potassium Citrate	32	suppressed
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	31	suppressed
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	31	12
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	31	suppressed
Mirtazapine	Mirtazapine	30	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	30	suppressed
Cholestyramine	Cholestyramine (With Sugar)	29	suppressed
Prednisone	Prednisone	29	21
Quetiapine Fumarate	Quetiapine Fumarate	29	suppressed
Diphenoxylate-Atropine	Diphenoxylate Hcl/Atropine	28	11
Toujeo Solostar	Insulin Glargine,hum.Rec.Anlog	28	suppressed
Dextroamphetamine-Amphetamine	Dextroamphetamine/Amphetamine	27	suppressed
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	27	suppressed
Klor-Con M20	Potassium Chloride	26	suppressed
Memantine Hcl	Memantine Hcl	26	suppressed
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	26	suppressed
Doxycycline Hyclate	Doxycycline Hyclate	25	18
Fluoxetine Hcl	Fluoxetine Hcl	25	suppressed
Paroxetine Hcl	Paroxetine Hcl	25	suppressed
Pregabalin	Pregabalin	25	suppressed
Prochlorperazine Maleate	Prochlorperazine Maleate	25	suppressed
Vitamin D2	Ergocalciferol (Vitamin D2)	25	suppressed
Aimovig Autoinjector	Erenumab-Aooe	24	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	24	suppressed
Diclofenac Sodium	Diclofenac Sodium	23	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	23	suppressed
Baclofen	Baclofen	22	13
Midodrine Hcl	Midodrine Hcl	22	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	22	suppressed
Cefdinir	Cefdinir	21	21
Raloxifene Hcl	Raloxifene Hcl	21	suppressed
Telmisartan	Telmisartan	21	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	20	16
Esomeprazole Magnesium	Esomeprazole Magnesium	20	suppressed
Clotrimazole-Betamethasone	Clotrimazole/Betamethasone Dip	19	14
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	19	suppressed
Januvia	Sitagliptin Phosphate	19	suppressed
Sucralfate	Sucralfate	19	12
Clindamycin Hcl	Clindamycin Hcl	18	suppressed
Naproxen	Naproxen	18	suppressed
Temazepam	Temazepam	18	suppressed
Valacyclovir	Valacyclovir Hcl	18	12
Humalog Kwikpen U-100	Insulin Lispro	17	suppressed
Levemir Flexpen	Insulin Detemir	17	suppressed
Myrbetriq	Mirabegron	17	suppressed
Nystatin	Nystatin	17	suppressed
Acyclovir	Acyclovir	16	suppressed
Fenofibrate	Fenofibrate	16	suppressed
Fluconazole	Fluconazole	16	suppressed
Naloxone Hcl	Naloxone Hcl	16	14
Olmesartan Medoxomil	Olmesartan Medoxomil	16	suppressed
Buspirone Hcl	Buspirone Hcl	15	suppressed
Colchicine	Colchicine	15	suppressed
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	15	suppressed
Levetiracetam	Levetiracetam	15	suppressed
Nystop	Nystatin	15	suppressed
Risedronate Sodium	Risedronate Sodium	15	suppressed
Topiramate	Topiramate	15	suppressed
Fludrocortisone Acetate	Fludrocortisone Acetate	14	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	14	suppressed
Metolazone	Metolazone	14	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	14	suppressed
Alfuzosin Hcl Er	Alfuzosin Hcl	13	suppressed
Digoxin	Digoxin	13	suppressed
Novolin N	Insulin Nph Human Isophane	13	suppressed
Olmesartan-Hydrochlorothiazide	Olmesartan/Hydrochlorothiazide	13	suppressed
Symbicort	Budesonide/Formoterol Fumarate	13	suppressed
Advair Diskus	Fluticasone Propion/Salmeterol	12	suppressed
Anoro Ellipta	Umeclidinium Brm/Vilanterol Tr	12	suppressed
Dutasteride	Dutasteride	12	suppressed
Fenofibric Acid	Fenofibric Acid (Choline)	12	suppressed
Lansoprazole	Lansoprazole	12	suppressed
Ramipril	Ramipril	12	suppressed
Sotalol	Sotalol Hcl	12	suppressed
Zaleplon	Zaleplon	12	suppressed
Betamethasone Valerate	Betamethasone Valerate	11	suppressed
Clobetasol Propionate	Clobetasol Propionate	11	suppressed
Ketoconazole	Ketoconazole	11	11
Lantus	Insulin Glargine,hum.Rec.Anlog	11	suppressed
Oxycodone Hcl	Oxycodone Hcl	11	suppressed
Prolia	Denosumab	11	suppressed
Testosterone	Testosterone	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