Healthcare provider profile · identity verified

Gregory L Colon, MD

Family Practice · SAN MARCOS, TX · NPI 1972594141

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
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	740	98
Atorvastatin Calcium	Atorvastatin Calcium	433	124
Levothyroxine Sodium	Levothyroxine Sodium	370	91
Lisinopril	Lisinopril	335	100
Amlodipine Besylate	Amlodipine Besylate	333	97
Gabapentin	Gabapentin	330	66
Alprazolam	Alprazolam	321	38
Meloxicam	Meloxicam	294	72
Albuterol Sulfate Hfa	Albuterol Sulfate	292	70
Pantoprazole Sodium	Pantoprazole Sodium	255	72
Tramadol Hcl	Tramadol Hcl	236	44
Metformin Hcl	Metformin Hcl	234	60
Trazodone Hcl	Trazodone Hcl	222	55
Losartan Potassium	Losartan Potassium	207	57
Zolpidem Tartrate	Zolpidem Tartrate	162	31
Omeprazole	Omeprazole	161	46
Trulicity	Dulaglutide	140	19
Hydrochlorothiazide	Hydrochlorothiazide	138	46
Ozempic	Semaglutide	137	30
Tamsulosin Hcl	Tamsulosin Hcl	136	36
Rosuvastatin Calcium	Rosuvastatin Calcium	132	38
Tizanidine Hcl	Tizanidine Hcl	125	25
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	124	37
Promethazine Hcl	Promethazine Hcl	119	11
Sertraline Hcl	Sertraline Hcl	116	25
Duloxetine Hcl	Duloxetine Hcl	113	30
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	112	14
Clonazepam	Clonazepam	108	28
Ondansetron Odt	Ondansetron	105	28
Triamcinolone Acetonide	Triamcinolone Acetonide	105	58
Azithromycin	Azithromycin	104	86
Escitalopram Oxalate	Escitalopram Oxalate	101	23
Diazepam	Diazepam	99	13
Pravastatin Sodium	Pravastatin Sodium	97	23
Fluticasone Propionate	Fluticasone Propionate	93	22
Pregabalin	Pregabalin	93	19
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	91	28
Lorazepam	Lorazepam	89	18
Oxycodone Hcl	Oxycodone Hcl	75	12
Metformin Hcl Er	Metformin Hcl	74	25
Hydroxyzine Hcl	Hydroxyzine Hcl	71	18
Montelukast Sodium	Montelukast Sodium	71	23
Carvedilol	Carvedilol	70	19
Clonidine Hcl	Clonidine Hcl	70	16
Dextroamphetamine-Amphetamine	Dextroamphetamine/Amphetamine	69	11
Potassium Chloride	Potassium Chloride	65	14
Ibuprofen	Ibuprofen	64	13
Glipizide	Glipizide	61	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	61	suppressed
Allopurinol	Allopurinol	59	20
Furosemide	Furosemide	59	24
Metoprolol Succinate	Metoprolol Succinate	58	23
Simvastatin	Simvastatin	56	19
Testosterone Cypionate	Testosterone Cypionate	56	13
Acetaminophen-Codeine	Acetaminophen With Codeine	54	15
Oxybutynin Chloride Er	Oxybutynin Chloride	54	12
Propranolol Hcl	Propranolol Hcl	53	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	50	15
Ciprofloxacin Hcl	Ciprofloxacin Hcl	47	34
Valsartan	Valsartan	47	14
Bupropion Xl	Bupropion Hcl	46	11
Venlafaxine Hcl Er	Venlafaxine Hcl	46	suppressed
Ezetimibe	Ezetimibe	45	suppressed
Glipizide Er	Glipizide	45	12
Temazepam	Temazepam	45	suppressed
Azelastine Hcl	Azelastine Hcl	44	11
Estradiol	Estradiol	43	14
Januvia	Sitagliptin Phosphate	43	suppressed
Prednisone	Prednisone	43	13
Jardiance	Empagliflozin	42	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	41	14
Linzess	Linaclotide	41	suppressed
Mirtazapine	Mirtazapine	41	suppressed
Citalopram Hbr	Citalopram Hydrobromide	38	suppressed
Diclofenac Sodium	Diclofenac Sodium	38	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	38	12
Lovastatin	Lovastatin	38	12
Myrbetriq	Mirabegron	38	suppressed
Donepezil Hcl	Donepezil Hcl	37	11
Eliquis	Apixaban	36	11
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	36	suppressed
Methocarbamol	Methocarbamol	35	11
Vitamin D2	Ergocalciferol (Vitamin D2)	35	suppressed
Clopidogrel	Clopidogrel Bisulfate	34	suppressed
Finasteride	Finasteride	34	suppressed
Fluconazole	Fluconazole	33	14
Celecoxib	Celecoxib	32	suppressed
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	32	suppressed
Eszopiclone	Eszopiclone	31	11
Naproxen	Naproxen	31	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	29	suppressed
Enalapril Maleate	Enalapril Maleate	29	suppressed
Metoprolol Tartrate	Metoprolol Tartrate	29	11
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	29	20
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	28	suppressed
Cephalexin	Cephalexin	27	24
Fentanyl	Fentanyl	27	suppressed
Levocetirizine Dihydrochloride	Levocetirizine Dihydrochloride	27	suppressed
Butalbital-Acetaminophen-Caffe	Butalb/Acetaminophen/Caffeine	26	suppressed
Famotidine	Famotidine	26	suppressed
Propranolol Hcl Er	Propranolol Hcl	26	suppressed
Ropinirole Hcl	Ropinirole Hcl	26	suppressed
Buspirone Hcl	Buspirone Hcl	25	suppressed
Farxiga	Dapagliflozin Propanediol	25	suppressed
Glimepiride	Glimepiride	25	suppressed
Ketoconazole	Ketoconazole	25	suppressed
Levofloxacin	Levofloxacin	25	18
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	24	16
Fenofibrate	Fenofibrate	22	suppressed
Nifedipine Er	Nifedipine	22	suppressed
Tresiba Flextouch U-100	Insulin Degludec	22	suppressed
Baclofen	Baclofen	21	suppressed
Cefdinir	Cefdinir	21	15
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	21	suppressed
Lamotrigine	Lamotrigine	21	suppressed
Tramadol Hcl-Acetaminophen	Tramadol Hcl/Acetaminophen	21	suppressed
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	21	suppressed
Paroxetine Hcl	Paroxetine Hcl	20	suppressed
Tresiba Flextouch U-200	Insulin Degludec	20	suppressed
Xarelto	Rivaroxaban	20	suppressed
Diphenoxylate-Atropine	Diphenoxylate Hcl/Atropine	19	11
Lantus	Insulin Glargine,hum.Rec.Anlog	19	suppressed
Latanoprost	Latanoprost	19	suppressed
Mometasone Furoate	Mometasone Furoate	19	suppressed
Primidone	Primidone	19	suppressed
Valacyclovir	Valacyclovir Hcl	19	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	18	suppressed
Benazepril Hcl	Benazepril Hcl	18	suppressed
Leflunomide	Leflunomide	18	suppressed
Meclizine Hcl	Meclizine Hcl	17	12
Restasis	Cyclosporine	17	suppressed
Doxycycline Hyclate	Doxycycline Hyclate	16	12
Sildenafil Citrate	Sildenafil Citrate	16	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	16	suppressed
Atenolol	Atenolol	15	suppressed
Carisoprodol	Carisoprodol	15	suppressed
Lidocaine	Lidocaine	15	suppressed
Methylphenidate Hcl	Methylphenidate Hcl	15	suppressed
Nebivolol Hcl	Nebivolol Hcl	15	suppressed
Terbinafine Hcl	Terbinafine Hcl	15	suppressed
Memantine Hcl	Memantine Hcl	14	suppressed
Methylprednisolone	Methylprednisolone	14	12
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	14	suppressed
Neomycin-Polymyxin-Hc	Neomycin/Polymyxin B/Hydrocort	14	suppressed
Testosterone	Testosterone	14	suppressed
Vascepa	Icosapent Ethyl	14	suppressed
Ambien	Zolpidem Tartrate	13	suppressed
Ammonium Lactate	Ammonium Lactate	13	suppressed
Dextroamphetamine-Amphet Er	Dextroamphetamine/Amphetamine	13	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	13	suppressed
Fenofibrate	Fenofibrate Nanocrystallized	13	suppressed
Humalog Kwikpen U-100	Insulin Lispro	13	suppressed
Metformin Er Osmotic	Metformin Hcl	13	suppressed
Xanax	Alprazolam	13	suppressed
Breo Ellipta	Fluticasone/Vilanterol	12	suppressed
Indomethacin	Indomethacin	12	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	12	suppressed
Symbicort	Budesonide/Formoterol Fumarate	12	suppressed
Synthroid	Levothyroxine Sodium	12	suppressed
Tramadol Hcl Er	Tramadol Hcl	12	suppressed
Vraylar	Cariprazine Hcl	12	suppressed
Wixela Inhub	Fluticasone Propion/Salmeterol	12	suppressed
Colchicine	Colchicine	11	suppressed
Dupixent Pen	Dupilumab	11	suppressed
Epinephrine	Epinephrine	11	suppressed
Estradiol (Once Weekly)	Estradiol	11	suppressed
Hydrocortisone	Hydrocortisone	11	suppressed
Mounjaro	Tirzepatide	11	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	11	suppressed
Ramelteon	Ramelteon	11	suppressed
Terazosin Hcl	Terazosin Hcl	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