Healthcare provider profile · identity verified

Stephen C Lamberton, MD

Family Practice · CUDAHY, WI · NPI 1558435123

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
Losartan Potassium	Losartan Potassium	338	81
Levothyroxine Sodium	Levothyroxine Sodium	330	75
Atorvastatin Calcium	Atorvastatin Calcium	286	69
Gabapentin	Gabapentin	284	45
Amlodipine Besylate	Amlodipine Besylate	248	73
Pantoprazole Sodium	Pantoprazole Sodium	222	57
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	202	30
Simvastatin	Simvastatin	184	46
Potassium Chloride	Potassium Chloride	179	44
Citalopram Hbr	Citalopram Hydrobromide	174	35
Omeprazole	Omeprazole	173	44
Trazodone Hcl	Trazodone Hcl	173	40
Furosemide	Furosemide	168	47
Metoprolol Tartrate	Metoprolol Tartrate	153	36
Tamsulosin Hcl	Tamsulosin Hcl	130	26
Hydrochlorothiazide	Hydrochlorothiazide	128	39
Metoprolol Succinate	Metoprolol Succinate	127	31
Metformin Hcl	Metformin Hcl	124	36
Lorazepam	Lorazepam	121	23
Pravastatin Sodium	Pravastatin Sodium	110	27
Diazepam	Diazepam	109	19
Tramadol Hcl	Tramadol Hcl	109	25
Eliquis	Apixaban	107	17
Cefuroxime	Cefuroxime Axetil	100	70
Warfarin Sodium	Warfarin Sodium	96	12
Clopidogrel	Clopidogrel Bisulfate	91	26
Januvia	Sitagliptin Phosphate	89	20
Prednisone	Prednisone	89	59
Lisinopril	Lisinopril	87	23
Glipizide	Glipizide	84	19
Albuterol Sulfate Hfa	Albuterol Sulfate	83	37
Allopurinol	Allopurinol	83	23
Sertraline Hcl	Sertraline Hcl	81	13
Escitalopram Oxalate	Escitalopram Oxalate	80	18
Baclofen	Baclofen	77	28
Zolpidem Tartrate	Zolpidem Tartrate	75	13
Pregabalin	Pregabalin	71	13
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	63	18
Meclizine Hcl	Meclizine Hcl	60	24
Ropinirole Hcl	Ropinirole Hcl	60	15
Enalapril Maleate	Enalapril Maleate	58	16
Metformin Hcl Er	Metformin Hcl	57	14
Ibuprofen	Ibuprofen	56	14
Spironolactone	Spironolactone	55	13
Fenofibrate	Fenofibrate Nanocrystallized	54	13
Donepezil Hcl	Donepezil Hcl	53	suppressed
Doxycycline Hyclate	Doxycycline Hyclate	53	33
Amoxicillin	Amoxicillin	50	20
Temazepam	Temazepam	50	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	49	13
Bupropion Hcl Sr	Bupropion Hcl	48	suppressed
Ezetimibe	Ezetimibe	48	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	48	suppressed
Duloxetine Hcl	Duloxetine Hcl	47	14
Rosuvastatin Calcium	Rosuvastatin Calcium	47	11
Oxycodone Hcl	Oxycodone Hcl	46	suppressed
Atenolol	Atenolol	45	11
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	44	11
Isosorbide Mononitrate Er	Isosorbide Mononitrate	44	suppressed
Jardiance	Empagliflozin	44	suppressed
Tizanidine Hcl	Tizanidine Hcl	42	11
Bupropion Xl	Bupropion Hcl	41	13
Clonazepam	Clonazepam	41	suppressed
Rybelsus	Semaglutide	41	suppressed
Azelastine Hcl	Azelastine Hcl	40	20
Fluticasone Propionate	Fluticasone Propionate	40	27
Amiodarone Hcl	Amiodarone Hcl	39	suppressed
Carvedilol	Carvedilol	39	13
Glimepiride	Glimepiride	39	suppressed
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	38	14
Memantine Hcl	Memantine Hcl	37	suppressed
Xarelto	Rivaroxaban	37	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	36	27
Triamcinolone Acetonide	Triamcinolone Acetonide	36	23
Fluconazole	Fluconazole	35	17
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	33	suppressed
Montelukast Sodium	Montelukast Sodium	32	suppressed
Ozempic	Semaglutide	32	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	31	suppressed
Levetiracetam	Levetiracetam	30	suppressed
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	30	suppressed
Clotrimazole-Betamethasone	Clotrimazole/Betamethasone Dip	29	18
Nortriptyline Hcl	Nortriptyline Hcl	29	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	28	20
Meloxicam	Meloxicam	28	suppressed
Wixela Inhub	Fluticasone Propion/Salmeterol	27	suppressed
Combivent Respimat	Ipratropium/Albuterol Sulfate	26	suppressed
Alprazolam	Alprazolam	25	suppressed
Famotidine	Famotidine	24	suppressed
Ibandronate Sodium	Ibandronate Sodium	24	suppressed
Ondansetron Hcl	Ondansetron Hcl	24	12
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	23	suppressed
Buspirone Hcl	Buspirone Hcl	23	suppressed
Celecoxib	Celecoxib	23	suppressed
Fenofibrate	Fenofibrate	23	suppressed
Ventolin Hfa	Albuterol Sulfate	22	suppressed
Topiramate	Topiramate	21	suppressed
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	21	suppressed
Cephalexin	Cephalexin	20	16
Mirtazapine	Mirtazapine	20	suppressed
Olmesartan Medoxomil	Olmesartan Medoxomil	20	suppressed
Trulicity	Dulaglutide	20	suppressed
Azithromycin	Azithromycin	19	13
Hydroxyzine Hcl	Hydroxyzine Hcl	19	suppressed
Irbesartan	Irbesartan	19	suppressed
Lantus	Insulin Glargine,hum.Rec.Anlog	19	suppressed
Clonidine Hcl	Clonidine Hcl	18	suppressed
Clotrimazole	Clotrimazole	18	suppressed
Indapamide	Indapamide	18	suppressed
Lamotrigine	Lamotrigine	18	suppressed
Terbinafine Hcl	Terbinafine Hcl	18	suppressed
Valacyclovir	Valacyclovir Hcl	18	suppressed
Diltiazem 24hr Er	Diltiazem Hcl	17	suppressed
Glipizide Er	Glipizide	17	suppressed
Humalog Mix 75-25	Insulin Lispro Protamin/Lispro	17	suppressed
Hydralazine Hcl	Hydralazine Hcl	17	suppressed
Metronidazole	Metronidazole	17	suppressed
Ultra-Fine Mini Pen Needle	Pen Needle, Diabetic	17	suppressed
Diclofenac Sodium	Diclofenac Sodium	16	11
Paroxetine Hcl	Paroxetine Hcl	16	suppressed
Testosterone	Testosterone	16	suppressed
Doxepin Hcl	Doxepin Hcl	15	suppressed
Janumet	Sitagliptin Phos/Metformin Hcl	15	suppressed
Midodrine Hcl	Midodrine Hcl	15	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	15	suppressed
Tradjenta	Linagliptin	15	suppressed
Acetaminophen-Codeine	Acetaminophen With Codeine	14	suppressed
Divalproex Sodium	Divalproex Sodium	14	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	14	suppressed
Finasteride	Finasteride	14	suppressed
Latanoprost	Latanoprost	14	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	14	suppressed
Propranolol Hcl Er	Propranolol Hcl	14	suppressed
Cefdinir	Cefdinir	13	11
Esomeprazole Magnesium	Esomeprazole Magnesium	13	suppressed
Hydrocortisone	Hydrocortisone	13	suppressed
Paxlovid	Nirmatrelvir/Ritonavir	13	13
Tramadol Hcl-Acetaminophen	Tramadol Hcl/Acetaminophen	13	suppressed
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	13	suppressed
Olanzapine	Olanzapine	12	suppressed
Probenecid	Probenecid	12	suppressed
Tri-Mili	Norgestimate-Ethinyl Estradiol	12	suppressed
Valsartan	Valsartan	12	suppressed
Alprazolam Er	Alprazolam	11	suppressed
Bisoprolol Fumarate	Bisoprolol Fumarate	11	suppressed
Carbidopa-Levodopa	Carbidopa/Levodopa	11	suppressed
Fentanyl	Fentanyl	11	suppressed
Humalog	Insulin Lispro	11	suppressed
Ipratropium Bromide	Ipratropium Bromide	11	suppressed
Ondansetron Odt	Ondansetron	11	suppressed
Synthroid	Levothyroxine Sodium	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