Healthcare provider profile · identity verified

David Clark Flack, D.O.

Family Practice · WINCHESTER, VA · NPI 1730384298

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	694	200
Amlodipine Besylate	Amlodipine Besylate	486	133
Lisinopril	Lisinopril	416	118
Rosuvastatin Calcium	Rosuvastatin Calcium	323	88
Levothyroxine Sodium	Levothyroxine Sodium	321	84
Losartan Potassium	Losartan Potassium	303	88
Pantoprazole Sodium	Pantoprazole Sodium	296	82
Metformin Hcl	Metformin Hcl	270	70
Metoprolol Succinate	Metoprolol Succinate	250	66
Omeprazole	Omeprazole	241	65
Gabapentin	Gabapentin	240	68
Tamsulosin Hcl	Tamsulosin Hcl	239	66
Simvastatin	Simvastatin	232	60
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	217	43
Hydrochlorothiazide	Hydrochlorothiazide	213	66
Alprazolam	Alprazolam	206	36
Furosemide	Furosemide	182	50
Pravastatin Sodium	Pravastatin Sodium	151	41
Sertraline Hcl	Sertraline Hcl	140	42
Citalopram Hbr	Citalopram Hydrobromide	133	28
Zolpidem Tartrate	Zolpidem Tartrate	133	26
Buspirone Hcl	Buspirone Hcl	129	25
Lorazepam	Lorazepam	125	31
Allopurinol	Allopurinol	123	28
Trazodone Hcl	Trazodone Hcl	122	31
Duloxetine Hcl	Duloxetine Hcl	119	25
Carvedilol	Carvedilol	114	29
Escitalopram Oxalate	Escitalopram Oxalate	111	28
Potassium Chloride	Potassium Chloride	110	30
Glipizide	Glipizide	108	26
Oxycodone Hcl	Oxycodone Hcl	107	19
Tramadol Hcl	Tramadol Hcl	106	29
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	103	30
Meloxicam	Meloxicam	98	29
Metoprolol Tartrate	Metoprolol Tartrate	96	32
Albuterol Sulfate Hfa	Albuterol Sulfate	88	35
Metformin Hcl Er	Metformin Hcl	88	31
Ozempic	Semaglutide	87	18
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	84	19
Clopidogrel	Clopidogrel Bisulfate	81	24
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	77	23
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	74	17
Bupropion Xl	Bupropion Hcl	72	23
Venlafaxine Hcl Er	Venlafaxine Hcl	72	15
Fluticasone Propionate	Fluticasone Propionate	68	23
Finasteride	Finasteride	66	18
Bupropion Hcl Sr	Bupropion Hcl	65	14
Eliquis	Apixaban	64	20
Famotidine	Famotidine	64	20
Prednisone	Prednisone	64	26
Glipizide Er	Glipizide	63	15
Pregabalin	Pregabalin	62	13
Fluoxetine Hcl	Fluoxetine Hcl	61	14
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	58	14
Ondansetron Odt	Ondansetron	58	11
Clonazepam	Clonazepam	57	16
Celecoxib	Celecoxib	55	11
Montelukast Sodium	Montelukast Sodium	55	16
Alendronate Sodium	Alendronate Sodium	53	11
Fenofibrate	Fenofibrate	51	suppressed
Ultra-Fine Short Pen Needle	Pen Needle, Diabetic	50	14
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	47	14
Xarelto	Rivaroxaban	47	suppressed
Olanzapine	Olanzapine	46	suppressed
Spironolactone	Spironolactone	45	suppressed
Tizanidine Hcl	Tizanidine Hcl	45	12
Hydralazine Hcl	Hydralazine Hcl	44	13
Warfarin Sodium	Warfarin Sodium	43	14
Atenolol	Atenolol	42	11
Benazepril Hcl	Benazepril Hcl	42	12
Diclofenac Sodium	Diclofenac Sodium	42	14
Synthroid	Levothyroxine Sodium	42	14
Amitriptyline Hcl	Amitriptyline Hcl	40	suppressed
Enalapril Maleate	Enalapril Maleate	40	suppressed
Ezetimibe	Ezetimibe	39	11
Pioglitazone Hcl	Pioglitazone Hcl	39	13
Meclizine Hcl	Meclizine Hcl	38	13
Labetalol Hcl	Labetalol Hcl	37	suppressed
Lamotrigine	Lamotrigine	37	11
Dextroamphetamine-Amphetamine	Dextroamphetamine/Amphetamine	35	suppressed
Eszopiclone	Eszopiclone	35	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	35	17
Diazepam	Diazepam	34	suppressed
Ibandronate Sodium	Ibandronate Sodium	34	suppressed
Mirtazapine	Mirtazapine	33	suppressed
Olmesartan Medoxomil	Olmesartan Medoxomil	33	suppressed
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	32	suppressed
Nortriptyline Hcl	Nortriptyline Hcl	32	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	31	suppressed
Propranolol Hcl Er	Propranolol Hcl	31	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	30	suppressed
Bumetanide	Bumetanide	29	suppressed
Azithromycin	Azithromycin	28	20
Tresiba Flextouch U-100	Insulin Degludec	28	suppressed
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	27	suppressed
Januvia	Sitagliptin Phosphate	27	suppressed
Paroxetine Hcl	Paroxetine Hcl	27	suppressed
Acyclovir	Acyclovir	26	suppressed
Ondansetron Hcl	Ondansetron Hcl	26	suppressed
Trulicity	Dulaglutide	26	suppressed
Nifedipine Er	Nifedipine	25	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	25	suppressed
Valacyclovir	Valacyclovir Hcl	25	suppressed
Donepezil Hcl	Donepezil Hcl	24	suppressed
Nystatin	Nystatin	24	11
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	23	suppressed
Azelastine Hcl	Azelastine Hcl	22	suppressed
Naproxen	Naproxen	22	suppressed
Oxycontin	Oxycodone Hcl	22	suppressed
Valsartan	Valsartan	22	suppressed
Ipratropium Bromide	Ipratropium Bromide	21	suppressed
Lovastatin	Lovastatin	21	suppressed
Morphine Sulfate Er	Morphine Sulfate	21	suppressed
Propranolol Hcl	Propranolol Hcl	21	suppressed
Diphenoxylate-Atropine	Diphenoxylate Hcl/Atropine	20	suppressed
Fluconazole	Fluconazole	20	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	20	suppressed
Ropinirole Hcl	Ropinirole Hcl	20	suppressed
Amoxicillin	Amoxicillin	19	11
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	19	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	18	suppressed
Glimepiride	Glimepiride	18	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	18	suppressed
Ramipril	Ramipril	18	suppressed
Verapamil Er	Verapamil Hcl	18	suppressed
Clonidine Hcl	Clonidine Hcl	17	suppressed
Dutasteride	Dutasteride	17	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	17	suppressed
Fenofibrate	Fenofibrate Nanocrystallized	17	suppressed
Jardiance	Empagliflozin	17	suppressed
Novolog Flexpen	Insulin Aspart	17	suppressed
Naltrexone Hcl	Naltrexone Hcl	16	suppressed
Amiloride Hcl	Amiloride Hcl	15	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	15	suppressed
Humalog Kwikpen U-100	Insulin Lispro	15	suppressed
Ibuprofen	Ibuprofen	15	suppressed
Testosterone Cypionate	Testosterone Cypionate	15	suppressed
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	15	suppressed
Doxycycline Hyclate	Doxycycline Hyclate	14	11
Lansoprazole	Lansoprazole	14	suppressed
Methocarbamol	Methocarbamol	14	suppressed
Methotrexate	Methotrexate Sodium	14	suppressed
Midodrine Hcl	Midodrine Hcl	14	suppressed
Nitroglycerin	Nitroglycerin	14	suppressed
Temazepam	Temazepam	14	suppressed
Acetazolamide	Acetazolamide	13	suppressed
Candesartan Cilexetil	Candesartan Cilexetil	13	suppressed
Colesevelam Hcl	Colesevelam Hcl	13	suppressed
Jentadueto	Linagliptin/Metformin Hcl	13	suppressed
Klor-Con M20	Potassium Chloride	13	suppressed
Primidone	Primidone	13	suppressed
Colchicine	Colchicine	12	suppressed
Gemfibrozil	Gemfibrozil	12	suppressed
Vilazodone Hcl	Vilazodone Hcl	12	suppressed
Digoxin	Digoxin	11	suppressed
Droplet Pen Needle	Pen Needle, Diabetic	11	suppressed
Humulin 70/30 Kwikpen	Insulin Nph Hum/Reg Insulin Hm	11	suppressed
Levetiracetam	Levetiracetam	11	suppressed
Memantine Hcl	Memantine Hcl	11	suppressed
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	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