Healthcare provider profile · identity verified

Mark Koshar, M.D.

Internal Medicine · EASTON, PA · NPI 1538161963

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
Amlodipine Besylate	Amlodipine Besylate	806	214
Atorvastatin Calcium	Atorvastatin Calcium	726	202
Levothyroxine Sodium	Levothyroxine Sodium	510	122
Simvastatin	Simvastatin	502	135
Losartan Potassium	Losartan Potassium	373	100
Alprazolam	Alprazolam	272	61
Lisinopril	Lisinopril	265	74
Pantoprazole Sodium	Pantoprazole Sodium	238	61
Metoprolol Succinate	Metoprolol Succinate	233	63
Lorazepam	Lorazepam	208	44
Metoprolol Tartrate	Metoprolol Tartrate	202	54
Pravastatin Sodium	Pravastatin Sodium	201	51
Escitalopram Oxalate	Escitalopram Oxalate	199	47
Eliquis	Apixaban	198	48
Metformin Hcl	Metformin Hcl	197	54
Ezetimibe	Ezetimibe	183	51
Gabapentin	Gabapentin	164	33
Omeprazole	Omeprazole	160	45
Duloxetine Hcl	Duloxetine Hcl	137	28
Sertraline Hcl	Sertraline Hcl	134	33
Allopurinol	Allopurinol	133	34
Rosuvastatin Calcium	Rosuvastatin Calcium	131	41
Glimepiride	Glimepiride	129	34
Hydrochlorothiazide	Hydrochlorothiazide	129	40
Potassium Chloride	Potassium Chloride	119	35
Furosemide	Furosemide	116	31
Tamsulosin Hcl	Tamsulosin Hcl	114	31
Valsartan	Valsartan	107	28
Zolpidem Tartrate	Zolpidem Tartrate	97	19
Fenofibrate	Fenofibrate	94	21
Metformin Hcl Er	Metformin Hcl	93	26
Jardiance	Empagliflozin	91	19
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	90	23
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	86	24
Alendronate Sodium	Alendronate Sodium	85	20
Meloxicam	Meloxicam	85	33
Xarelto	Rivaroxaban	71	15
Januvia	Sitagliptin Phosphate	69	13
Albuterol Sulfate Hfa	Albuterol Sulfate	65	23
Olmesartan Medoxomil	Olmesartan Medoxomil	65	15
Lovastatin	Lovastatin	64	18
Tramadol Hcl	Tramadol Hcl	64	16
Fenofibrate	Fenofibrate Nanocrystallized	62	17
Ozempic	Semaglutide	61	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	61	15
Atenolol	Atenolol	55	15
Synthroid	Levothyroxine Sodium	55	15
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	54	11
Famotidine	Famotidine	53	14
Paroxetine Hcl	Paroxetine Hcl	52	14
Oxycodone Hcl	Oxycodone Hcl	51	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	51	41
Citalopram Hbr	Citalopram Hydrobromide	49	12
Carvedilol	Carvedilol	48	14
Fluticasone Propionate	Fluticasone Propionate	48	15
Trazodone Hcl	Trazodone Hcl	48	suppressed
Clopidogrel	Clopidogrel Bisulfate	47	15
Doxazosin Mesylate	Doxazosin Mesylate	45	11
Benazepril Hcl	Benazepril Hcl	44	13
Tradjenta	Linagliptin	43	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	41	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	40	13
Mirtazapine	Mirtazapine	38	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	37	suppressed
Pregabalin	Pregabalin	37	suppressed
Ropinirole Hcl	Ropinirole Hcl	36	suppressed
Acetaminophen-Codeine	Acetaminophen With Codeine	35	suppressed
Clotrimazole-Betamethasone	Clotrimazole/Betamethasone Dip	35	15
Bupropion Xl	Bupropion Hcl	34	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	34	31
Warfarin Sodium	Warfarin Sodium	33	suppressed
Buspirone Hcl	Buspirone Hcl	32	suppressed
Naproxen	Naproxen	32	suppressed
Amoxicillin	Amoxicillin	31	25
Temazepam	Temazepam	31	suppressed
Diazepam	Diazepam	30	suppressed
Carbidopa-Levodopa	Carbidopa/Levodopa	29	suppressed
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	28	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	28	11
Methylprednisolone	Methylprednisolone	27	24
Propranolol Hcl	Propranolol Hcl	27	suppressed
Repaglinide	Repaglinide	27	suppressed
Topiramate	Topiramate	27	suppressed
Verapamil Er	Verapamil Hcl	27	suppressed
Finasteride	Finasteride	26	suppressed
Janumet	Sitagliptin Phos/Metformin Hcl	26	suppressed
Spironolactone	Spironolactone	26	suppressed
Meclizine Hcl	Meclizine Hcl	25	17
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	24	suppressed
Donepezil Hcl	Donepezil Hcl	24	suppressed
Nifedipine Er	Nifedipine	24	suppressed
Azithromycin	Azithromycin	23	22
Ondansetron Hcl	Ondansetron Hcl	23	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	22	suppressed
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	22	suppressed
Ipratropium Bromide	Ipratropium Bromide	21	suppressed
Ramipril	Ramipril	21	suppressed
Clobetasol Propionate	Clobetasol Propionate	20	suppressed
Nortriptyline Hcl	Nortriptyline Hcl	20	suppressed
Omega-3 Acid Ethyl Esters	Omega-3 Acid Ethyl Esters	20	suppressed
Glipizide	Glipizide	19	suppressed
Glipizide Er	Glipizide	19	suppressed
Ezetimibe-Simvastatin	Ezetimibe/Simvastatin	18	suppressed
Hydroxychloroquine Sulfate	Hydroxychloroquine Sulfate	18	suppressed
Linzess	Linaclotide	18	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	17	13
Klor-Con M20	Potassium Chloride	17	suppressed
Paxlovid	Nirmatrelvir/Ritonavir	17	17
Anoro Ellipta	Umeclidinium Brm/Vilanterol Tr	16	suppressed
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	16	suppressed
Nystatin	Nystatin	16	suppressed
Clonazepam	Clonazepam	15	suppressed
Enalapril Maleate	Enalapril Maleate	15	suppressed
Levemir Flexpen	Insulin Detemir	15	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	15	suppressed
Ultra-Fine Mini Pen Needle	Pen Needle, Diabetic	15	suppressed
Bumetanide	Bumetanide	14	suppressed
Jantoven	Warfarin Sodium	14	suppressed
Ketoconazole	Ketoconazole	14	suppressed
Mometasone Furoate	Mometasone Furoate	14	suppressed
Nitroglycerin	Nitroglycerin	14	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	14	suppressed
Tizanidine Hcl	Tizanidine Hcl	14	suppressed
Tolterodine Tartrate Er	Tolterodine Tartrate	14	suppressed
Ampicillin Trihydrate	Ampicillin Trihydrate	13	12
Lactulose	Lactulose	13	suppressed
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	13	suppressed
Montelukast Sodium	Montelukast Sodium	13	suppressed
Nitroglycerin Patch	Nitroglycerin	13	suppressed
Relpax	Eletriptan Hydrobromide	13	suppressed
Ultra-Fine Short Pen Needle	Pen Needle, Diabetic	13	suppressed
Bisoprolol-Hydrochlorothiazide	Bisoprolol/Hydrochlorothiazide	12	suppressed
Breo Ellipta	Fluticasone/Vilanterol	12	suppressed
Cephalexin	Cephalexin	12	suppressed
Doxycycline Hyclate	Doxycycline Hyclate	12	11
Elmiron	Pentosan Polysulfate Sodium	12	suppressed
Farxiga	Dapagliflozin Propanediol	12	suppressed
Felodipine Er	Felodipine	12	suppressed
Humalog Mix 75-25	Insulin Lispro Protamin/Lispro	12	suppressed
Lidocaine	Lidocaine	12	suppressed
Metoclopramide Hcl	Metoclopramide Hcl	12	suppressed
Midodrine Hcl	Midodrine Hcl	12	suppressed
Nabumetone	Nabumetone	12	suppressed
Pyridostigmine Bromide	Pyridostigmine Bromide	12	suppressed
Restasis	Cyclosporine	12	suppressed
Spiriva Respimat	Tiotropium Bromide	12	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	11	suppressed
Imipramine Hcl	Imipramine Hcl	11	suppressed
Invokana	Canagliflozin	11	suppressed
Oxcarbazepine	Oxcarbazepine	11	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	11	suppressed
Prednisone	Prednisone	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