Healthcare provider profile · identity verified

Gregory Peter Schenk, MD

Family Practice · WILLIAMSVILLE, NY · NPI 1558354837

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
Levothyroxine Sodium	Levothyroxine Sodium	438	95
Atorvastatin Calcium	Atorvastatin Calcium	391	118
Lisinopril	Lisinopril	339	92
Amlodipine Besylate	Amlodipine Besylate	286	79
Rosuvastatin Calcium	Rosuvastatin Calcium	222	65
Omeprazole	Omeprazole	189	48
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	184	44
Gabapentin	Gabapentin	160	34
Metformin Hcl	Metformin Hcl	136	41
Pantoprazole Sodium	Pantoprazole Sodium	132	34
Hydrochlorothiazide	Hydrochlorothiazide	125	38
Metoprolol Succinate	Metoprolol Succinate	124	38
Fluticasone Propionate	Fluticasone Propionate	117	30
Baclofen	Baclofen	72	12
Escitalopram Oxalate	Escitalopram Oxalate	72	19
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	68	12
Pravastatin Sodium	Pravastatin Sodium	68	20
Tamsulosin Hcl	Tamsulosin Hcl	68	21
Atenolol	Atenolol	67	18
Losartan Potassium	Losartan Potassium	67	20
Ozempic	Semaglutide	67	17
Ibuprofen	Ibuprofen	62	22
Jardiance	Empagliflozin	62	14
Simvastatin	Simvastatin	62	17
Albuterol Sulfate Hfa	Albuterol Sulfate	60	31
Eliquis	Apixaban	60	17
Furosemide	Furosemide	55	15
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	51	44
Trazodone Hcl	Trazodone Hcl	51	15
Ezetimibe	Ezetimibe	49	11
Tramadol Hcl	Tramadol Hcl	49	12
Metoprolol Tartrate	Metoprolol Tartrate	46	13
Warfarin Sodium	Warfarin Sodium	46	suppressed
Allopurinol	Allopurinol	44	suppressed
Clopidogrel	Clopidogrel Bisulfate	44	13
Meloxicam	Meloxicam	44	suppressed
Famotidine	Famotidine	43	12
Fluoxetine Hcl	Fluoxetine Hcl	43	suppressed
Clonazepam	Clonazepam	42	12
Synthroid	Levothyroxine Sodium	42	12
Alendronate Sodium	Alendronate Sodium	41	suppressed
Prednisone	Prednisone	37	23
Diazepam	Diazepam	36	suppressed
Diclofenac Sodium	Diclofenac Sodium	36	12
Duloxetine Hcl	Duloxetine Hcl	34	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	34	suppressed
Doxycycline Hyclate	Doxycycline Hyclate	30	21
Valsartan	Valsartan	30	suppressed
Acyclovir	Acyclovir	29	suppressed
Mounjaro	Tirzepatide	28	suppressed
Paroxetine Hcl	Paroxetine Hcl	28	suppressed
Sertraline Hcl	Sertraline Hcl	28	suppressed
Valacyclovir	Valacyclovir Hcl	28	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	28	suppressed
Bupropion Hcl Sr	Bupropion Hcl	27	suppressed
Donepezil Hcl	Donepezil Hcl	27	suppressed
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	27	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	27	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	26	suppressed
Metformin Hcl Er	Metformin Hcl	26	suppressed
Paxlovid	Nirmatrelvir/Ritonavir	26	26
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	25	suppressed
Methocarbamol	Methocarbamol	24	suppressed
Alprazolam	Alprazolam	23	suppressed
Citalopram Hbr	Citalopram Hydrobromide	23	suppressed
Ropinirole Hcl	Ropinirole Hcl	22	suppressed
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	22	suppressed
Glipizide	Glipizide	21	suppressed
Irbesartan	Irbesartan	21	suppressed
Naproxen	Naproxen	21	suppressed
Midodrine Hcl	Midodrine Hcl	20	suppressed
Ondansetron Hcl	Ondansetron Hcl	20	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	20	suppressed
Potassium Chloride	Potassium Chloride	20	suppressed
Carvedilol	Carvedilol	18	suppressed
Morphine Sulfate	Morphine Sulfate	18	suppressed
Acetaminophen-Codeine	Acetaminophen With Codeine	17	suppressed
Benazepril Hcl	Benazepril Hcl	17	suppressed
Bupropion Xl	Bupropion Hcl	17	suppressed
Nitrofurantoin	Nitrofurantoin Macrocrystal	17	suppressed
Bumetanide	Bumetanide	16	suppressed
Buspirone Hcl	Buspirone Hcl	16	suppressed
Indomethacin	Indomethacin	16	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	16	suppressed
Metolazone	Metolazone	16	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	16	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	16	suppressed
Sildenafil Citrate	Sildenafil Citrate	16	suppressed
Trulicity	Dulaglutide	16	suppressed
Bisoprolol Fumarate	Bisoprolol Fumarate	15	suppressed
Spiriva Respimat	Tiotropium Bromide	15	suppressed
Venlafaxine Hcl	Venlafaxine Hcl	15	suppressed
Amoxicillin	Amoxicillin	14	11
Glimepiride	Glimepiride	14	suppressed
Lansoprazole	Lansoprazole	14	suppressed
Mometasone Furoate	Mometasone Furoate	14	suppressed
Mupirocin	Mupirocin	14	suppressed
Propranolol Hcl Er	Propranolol Hcl	14	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	14	13
Triamcinolone Acetonide	Triamcinolone Acetonide	14	11
Cholestyramine	Cholestyramine (With Sugar)	13	suppressed
Crestor	Rosuvastatin Calcium	13	suppressed
Irbesartan-Hydrochlorothiazide	Irbesartan/Hydrochlorothiazide	13	suppressed
Levonorgestrel-Eth Estradiol	Levonorgestrel/Ethin.Estradiol	13	suppressed
Meclizine Hcl	Meclizine Hcl	13	suppressed
Mesalamine Er	Mesalamine	13	suppressed
Nystatin	Nystatin	13	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	12	suppressed
Digoxin	Digoxin	12	suppressed
Lactulose	Lactulose	12	suppressed
Ondansetron Odt	Ondansetron	12	suppressed
Qvar Redihaler	Beclomethasone Dipropionate	12	suppressed
Carbamazepine	Carbamazepine	11	suppressed
Enalapril Maleate	Enalapril Maleate	11	suppressed
Lorazepam	Lorazepam	11	suppressed
Montelukast Sodium	Montelukast Sodium	11	suppressed
Myrbetriq	Mirabegron	11	suppressed
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	11	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	11	suppressed
Repatha Sureclick	Evolocumab	11	suppressed
Trospium Chloride Er	Trospium Chloride	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