Healthcare provider profile · identity verified

Gregory B Carlson, MD

Family Practice · DENISON, TX · NPI 1386694438

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	1213	322
Levothyroxine Sodium	Levothyroxine Sodium	487	126
Amlodipine Besylate	Amlodipine Besylate	457	133
Lisinopril	Lisinopril	408	97
Gabapentin	Gabapentin	335	101
Omeprazole	Omeprazole	325	84
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	290	71
Tamsulosin Hcl	Tamsulosin Hcl	288	85
Losartan Potassium	Losartan Potassium	268	77
Escitalopram Oxalate	Escitalopram Oxalate	260	74
Trazodone Hcl	Trazodone Hcl	255	66
Metoprolol Succinate	Metoprolol Succinate	253	69
Duloxetine Hcl	Duloxetine Hcl	242	59
Alprazolam	Alprazolam	216	53
Pantoprazole Sodium	Pantoprazole Sodium	208	72
Potassium Chloride	Potassium Chloride	202	59
Pregabalin	Pregabalin	201	53
Montelukast Sodium	Montelukast Sodium	200	64
Ozempic	Semaglutide	190	37
Hydrochlorothiazide	Hydrochlorothiazide	177	48
Sertraline Hcl	Sertraline Hcl	172	49
Metformin Hcl	Metformin Hcl	171	54
Finasteride	Finasteride	166	49
Clonazepam	Clonazepam	155	30
Metoprolol Tartrate	Metoprolol Tartrate	146	41
Celecoxib	Celecoxib	145	40
Hydroxyzine Hcl	Hydroxyzine Hcl	145	60
Clopidogrel	Clopidogrel Bisulfate	143	36
Lamotrigine	Lamotrigine	133	38
Tramadol Hcl	Tramadol Hcl	133	33
Prednisone	Prednisone	127	74
Bupropion Hcl Sr	Bupropion Hcl	125	41
Furosemide	Furosemide	117	42
Tizanidine Hcl	Tizanidine Hcl	117	54
Doxycycline Hyclate	Doxycycline Hyclate	114	92
Lorazepam	Lorazepam	112	28
Mounjaro	Tirzepatide	110	29
Spironolactone	Spironolactone	105	36
Topiramate	Topiramate	97	23
Meloxicam	Meloxicam	95	34
Albuterol Sulfate Hfa	Albuterol Sulfate	92	34
Pioglitazone Hcl	Pioglitazone Hcl	92	26
Estradiol	Estradiol	88	27
Propranolol Hcl	Propranolol Hcl	88	20
Fluticasone Propionate	Fluticasone Propionate	86	23
Fluoxetine Hcl	Fluoxetine Hcl	83	17
Quetiapine Fumarate	Quetiapine Fumarate	83	21
Alendronate Sodium	Alendronate Sodium	82	27
Zolpidem Tartrate	Zolpidem Tartrate	82	22
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	81	20
Mupirocin	Mupirocin	81	71
Warfarin Sodium	Warfarin Sodium	81	19
Sucralfate	Sucralfate	79	35
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	78	58
Buspirone Hcl	Buspirone Hcl	78	31
Rosuvastatin Calcium	Rosuvastatin Calcium	73	23
Aripiprazole	Aripiprazole	72	20
Metformin Hcl Er	Metformin Hcl	72	17
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	72	50
Nortriptyline Hcl	Nortriptyline Hcl	71	19
Paroxetine Hcl	Paroxetine Hcl	71	20
Citalopram Hbr	Citalopram Hydrobromide	68	25
Amoxicillin	Amoxicillin	66	54
Ondansetron Odt	Ondansetron	65	28
Bupropion Xl	Bupropion Hcl	63	19
Venlafaxine Hcl Er	Venlafaxine Hcl	62	14
Ropinirole Hcl	Ropinirole Hcl	60	13
Triamcinolone Acetonide	Triamcinolone Acetonide	57	43
Allopurinol	Allopurinol	54	14
Carvedilol	Carvedilol	54	17
Ondansetron Hcl	Ondansetron Hcl	50	27
Glimepiride	Glimepiride	48	15
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	46	14
Dicyclomine Hcl	Dicyclomine Hcl	46	20
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	46	14
Buprenorphine-Naloxone	Buprenorphine Hcl/Naloxone Hcl	45	suppressed
Mirtazapine	Mirtazapine	45	15
Doxycycline Monohydrate	Doxycycline Monohydrate	44	39
Amitriptyline Hcl	Amitriptyline Hcl	43	22
Eliquis	Apixaban	43	15
Acetaminophen-Codeine	Acetaminophen With Codeine	42	27
Jardiance	Empagliflozin	42	16
Famotidine	Famotidine	41	suppressed
Atenolol	Atenolol	40	suppressed
Methocarbamol	Methocarbamol	40	suppressed
Midodrine Hcl	Midodrine Hcl	40	12
Synthroid	Levothyroxine Sodium	38	suppressed
Ezetimibe	Ezetimibe	37	15
Methotrexate	Methotrexate Sodium	36	suppressed
Morphine Sulfate Er	Morphine Sulfate	36	suppressed
Azithromycin	Azithromycin	35	25
Fluconazole	Fluconazole	34	16
Temazepam	Temazepam	34	suppressed
Gemfibrozil	Gemfibrozil	33	suppressed
Cephalexin	Cephalexin	32	30
Testosterone Cypionate	Testosterone Cypionate	31	14
Fenofibrate	Fenofibrate Nanocrystallized	30	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	29	suppressed
Donepezil Hcl	Donepezil Hcl	27	suppressed
Methylphenidate Hcl	Methylphenidate Hcl	27	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	26	20
Diazepam	Diazepam	26	suppressed
Promethazine Hcl	Promethazine Hcl	26	13
Primidone	Primidone	25	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	24	20
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	24	suppressed
Hydralazine Hcl	Hydralazine Hcl	23	suppressed
Lamotrigine Er	Lamotrigine	22	suppressed
Acyclovir	Acyclovir	21	15
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	21	suppressed
Xarelto	Rivaroxaban	21	suppressed
Clindamycin Hcl	Clindamycin Hcl	20	17
Colestipol Hcl	Colestipol Hcl	20	13
Metoclopramide Hcl	Metoclopramide Hcl	20	suppressed
Bupropion Hcl	Bupropion Hcl	18	suppressed
Butalbital-Acetaminophen-Caffe	Butalb/Acetaminophen/Caffeine	18	suppressed
Humalog Mix 50-50 Kwikpen	Insulin Lispro Protamin/Lispro	18	suppressed
Ipratropium Bromide	Ipratropium Bromide	18	suppressed
Baclofen	Baclofen	17	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	17	suppressed
Sotalol	Sotalol Hcl	16	suppressed
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	16	suppressed
Venlafaxine Hcl	Venlafaxine Hcl	16	suppressed
Bumetanide	Bumetanide	15	suppressed
Carbidopa-Levodopa	Carbidopa/Levodopa	15	suppressed
Cholestyramine	Cholestyramine (With Sugar)	15	suppressed
Morphine Sulfate	Morphine Sulfate	15	suppressed
Oxycodone Hcl	Oxycodone Hcl	15	suppressed
Tradjenta	Linagliptin	15	suppressed
Alcohol Pads	Alcohol Antiseptic Pads	14	suppressed
Comfort Ez Pen Needle	Pen Needle, Diabetic	13	suppressed
Dutasteride	Dutasteride	13	suppressed
Farxiga	Dapagliflozin Propanediol	13	suppressed
Irbesartan	Irbesartan	13	suppressed
Klor-Con M20	Potassium Chloride	13	suppressed
Levocetirizine Dihydrochloride	Levocetirizine Dihydrochloride	13	suppressed
Lovastatin	Lovastatin	13	suppressed
Nitroglycerin	Nitroglycerin	13	11
Pravastatin Sodium	Pravastatin Sodium	13	suppressed
Verapamil Hcl	Verapamil Hcl	13	suppressed
Myrbetriq	Mirabegron	12	suppressed
Rizatriptan	Rizatriptan Benzoate	12	suppressed
Valacyclovir	Valacyclovir Hcl	12	suppressed
Dropsafe Prep Pads	Alcohol Antiseptic Pads	11	suppressed
Enalapril Maleate	Enalapril Maleate	11	suppressed
Erythromycin	Erythromycin Base	11	11
Esomeprazole Magnesium	Esomeprazole Magnesium	11	suppressed
Hydrocortisone	Hydrocortisone	11	suppressed
Isosorbide Mononitrate	Isosorbide Mononitrate	11	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	11	suppressed
Nifedipine Er	Nifedipine	11	suppressed
Spiriva Respimat	Tiotropium Bromide	11	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	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