Healthcare provider profile · identity verified

Mark C Gunby, DO

Internal Medicine · SAINT LOUIS, MO · NPI 1699886309

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	851	260
Lisinopril	Lisinopril	694	219
Amlodipine Besylate	Amlodipine Besylate	542	168
Levothyroxine Sodium	Levothyroxine Sodium	490	139
Simvastatin	Simvastatin	374	118
Eliquis	Apixaban	314	59
Rosuvastatin Calcium	Rosuvastatin Calcium	303	95
Gabapentin	Gabapentin	294	86
Losartan Potassium	Losartan Potassium	279	87
Omeprazole	Omeprazole	279	98
Tamsulosin Hcl	Tamsulosin Hcl	242	63
Tramadol Hcl	Tramadol Hcl	242	76
Metoprolol Succinate	Metoprolol Succinate	235	71
Furosemide	Furosemide	210	63
Trazodone Hcl	Trazodone Hcl	199	60
Alprazolam	Alprazolam	187	74
Sertraline Hcl	Sertraline Hcl	187	48
Metformin Hcl	Metformin Hcl	181	59
Pantoprazole Sodium	Pantoprazole Sodium	178	58
Hydrochlorothiazide	Hydrochlorothiazide	176	54
Potassium Chloride	Potassium Chloride	174	48
Alendronate Sodium	Alendronate Sodium	163	53
Doxazosin Mesylate	Doxazosin Mesylate	155	41
Ezetimibe	Ezetimibe	152	48
Escitalopram Oxalate	Escitalopram Oxalate	151	44
Pravastatin Sodium	Pravastatin Sodium	148	52
Arexvy	Rsvpref3 Antigen/As01e/Pf	145	145
Allopurinol	Allopurinol	134	42
Metoprolol Tartrate	Metoprolol Tartrate	134	44
Albuterol Sulfate Hfa	Albuterol Sulfate	133	52
Clopidogrel	Clopidogrel Bisulfate	126	37
Famotidine	Famotidine	118	28
Jardiance	Empagliflozin	114	30
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	111	32
Metformin Hcl Er	Metformin Hcl	110	34
Carbidopa-Levodopa	Carbidopa/Levodopa	109	13
Finasteride	Finasteride	108	30
Glipizide	Glipizide	108	35
Zolpidem Tartrate	Zolpidem Tartrate	108	22
Duloxetine Hcl	Duloxetine Hcl	106	28
Fluticasone Propionate	Fluticasone Propionate	105	37
Meloxicam	Meloxicam	104	39
Citalopram Hbr	Citalopram Hydrobromide	103	34
Atenolol	Atenolol	99	36
Mirtazapine	Mirtazapine	99	31
Spironolactone	Spironolactone	95	28
Xarelto	Rivaroxaban	95	17
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	90	26
Carvedilol	Carvedilol	88	27
Donepezil Hcl	Donepezil Hcl	81	13
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	80	28
Ozempic	Semaglutide	78	18
Venlafaxine Hcl Er	Venlafaxine Hcl	74	13
Celecoxib	Celecoxib	71	18
Fluoxetine Hcl	Fluoxetine Hcl	66	18
Memantine Hcl	Memantine Hcl	64	13
Enalapril Maleate	Enalapril Maleate	61	18
Warfarin Sodium	Warfarin Sodium	61	11
Clonazepam	Clonazepam	58	14
Lovastatin	Lovastatin	58	20
Nitroglycerin	Nitroglycerin	55	31
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	55	suppressed
Anoro Ellipta	Umeclidinium Brm/Vilanterol Tr	54	suppressed
Hydralazine Hcl	Hydralazine Hcl	52	17
Bupropion Xl	Bupropion Hcl	51	18
Azithromycin	Azithromycin	48	35
Lorazepam	Lorazepam	48	19
Ropinirole Hcl	Ropinirole Hcl	47	suppressed
Diazepam	Diazepam	43	14
Ipratropium Bromide	Ipratropium Bromide	43	13
Buspirone Hcl	Buspirone Hcl	42	12
Montelukast Sodium	Montelukast Sodium	40	16
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	39	16
Triamcinolone Acetonide	Triamcinolone Acetonide	38	24
Prednisone	Prednisone	37	11
Ramipril	Ramipril	37	suppressed
Vitamin D2	Ergocalciferol (Vitamin D2)	37	suppressed
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	35	suppressed
Pregabalin	Pregabalin	35	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	33	11
Tizanidine Hcl	Tizanidine Hcl	33	16
Dicyclomine Hcl	Dicyclomine Hcl	32	12
Doxycycline Hyclate	Doxycycline Hyclate	32	27
Breo Ellipta	Fluticasone/Vilanterol	31	suppressed
Diltiazem 24hr Er	Diltiazem Hcl	30	suppressed
Diltiazem 24hr Er (Xr)	Diltiazem Hcl	30	suppressed
Fludrocortisone Acetate	Fludrocortisone Acetate	30	suppressed
Glipizide Er	Glipizide	30	suppressed
Fentanyl	Fentanyl	29	suppressed
Mounjaro	Tirzepatide	29	suppressed
Brimonidine Tartrate	Brimonidine Tartrate	28	suppressed
Bupropion Hcl Sr	Bupropion Hcl	27	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	27	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	27	12
Methylprednisolone	Methylprednisolone	27	23
Dorzolamide-Timolol	Dorzolamide Hcl/Timolol Maleat	25	suppressed
Fenofibrate	Fenofibrate Nanocrystallized	25	suppressed
Bupropion Hcl	Bupropion Hcl	24	suppressed
Januvia	Sitagliptin Phosphate	24	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	24	20
Torsemide	Torsemide	24	suppressed
Valacyclovir	Valacyclovir Hcl	24	15
Cephalexin	Cephalexin	23	20
Amitriptyline Hcl	Amitriptyline Hcl	22	suppressed
Oxycodone Hcl	Oxycodone Hcl	22	suppressed
Paroxetine Hcl	Paroxetine Hcl	22	suppressed
Terazosin Hcl	Terazosin Hcl	22	suppressed
Azelastine Hcl	Azelastine Hcl	21	suppressed
Diclofenac Sodium	Diclofenac Sodium	21	suppressed
Irbesartan	Irbesartan	21	suppressed
Lamotrigine	Lamotrigine	21	suppressed
Alfuzosin Hcl Er	Alfuzosin Hcl	20	suppressed
Clobetasol Propionate	Clobetasol Propionate	20	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	20	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	20	17
Toujeo Solostar	Insulin Glargine,hum.Rec.Anlog	20	suppressed
Nifedipine Er	Nifedipine	19	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	19	suppressed
Synthroid	Levothyroxine Sodium	19	suppressed
Insulin Aspart Flexpen	Insulin Aspart	18	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	18	suppressed
Valsartan	Valsartan	18	suppressed
Baclofen	Baclofen	17	suppressed
Clonidine Hcl	Clonidine Hcl	17	suppressed
Fenofibrate	Fenofibrate	17	suppressed
Hydrocortisone	Hydrocortisone	17	suppressed
Latanoprost	Latanoprost	17	suppressed
Myrbetriq	Mirabegron	17	suppressed
Nortriptyline Hcl	Nortriptyline Hcl	17	suppressed
Nystatin	Nystatin	17	suppressed
Symbicort	Budesonide/Formoterol Fumarate	17	suppressed
Betamethasone Dipropionate	Betamethasone Dipropionate	16	suppressed
Budesonide-Formoterol Fumarate	Budesonide/Formoterol Fumarate	16	suppressed
Lithium Carbonate	Lithium Carbonate	16	suppressed
Propranolol Hcl Er	Propranolol Hcl	16	suppressed
Tradjenta	Linagliptin	16	suppressed
Amoxicillin	Amoxicillin	15	14
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	15	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	15	suppressed
Loperamide	Loperamide Hcl	15	suppressed
Rizatriptan	Rizatriptan Benzoate	15	suppressed
Solifenacin Succinate	Solifenacin Succinate	15	suppressed
Dilt-Xr	Diltiazem Hcl	14	suppressed
Glimepiride	Glimepiride	14	suppressed
Levetiracetam	Levetiracetam	14	suppressed
Mupirocin	Mupirocin	14	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	14	suppressed
Paxlovid	Nirmatrelvir/Ritonavir	14	13
Rivastigmine	Rivastigmine	14	suppressed
Topiramate	Topiramate	14	suppressed
Colesevelam Hcl	Colesevelam Hcl	13	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	13	suppressed
Memantine Hcl Er	Memantine Hcl	13	suppressed
Olmesartan Medoxomil	Olmesartan Medoxomil	13	suppressed
Omega-3 Acid Ethyl Esters	Omega-3 Acid Ethyl Esters	13	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	13	suppressed
Primidone	Primidone	13	suppressed
Sotalol	Sotalol Hcl	13	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	12	11
Benazepril Hcl	Benazepril Hcl	12	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	12	suppressed
Combivent Respimat	Ipratropium/Albuterol Sulfate	12	suppressed
Digoxin	Digoxin	12	suppressed
Gemfibrozil	Gemfibrozil	12	suppressed
Nystatin-Triamcinolone	Nystatin/Triamcinolone Acet	12	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	12	suppressed
Anastrozole	Anastrozole	11	suppressed
Bumetanide	Bumetanide	11	suppressed
Diltiazem Hcl	Diltiazem Hcl	11	suppressed
Nebivolol Hcl	Nebivolol Hcl	11	suppressed
Novolin N Flexpen	Insulin Nph Human Isophane	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