Healthcare provider profile · identity verified

Michael Lloyd Mcmahon, M.D.

Internal Medicine · NEDERLAND, TX · NPI 1548240641

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	639	145
Levothyroxine Sodium	Levothyroxine Sodium	584	104
Eliquis	Apixaban	423	91
Pantoprazole Sodium	Pantoprazole Sodium	379	100
Donepezil Hcl	Donepezil Hcl	355	54
Furosemide	Furosemide	332	92
Gabapentin	Gabapentin	283	70
Amlodipine Besylate	Amlodipine Besylate	270	78
Clopidogrel	Clopidogrel Bisulfate	266	65
Metoprolol Tartrate	Metoprolol Tartrate	250	63
Potassium Chloride	Potassium Chloride	238	65
Memantine Hcl	Memantine Hcl	232	35
Famotidine	Famotidine	227	51
Trazodone Hcl	Trazodone Hcl	220	59
Escitalopram Oxalate	Escitalopram Oxalate	218	46
Lisinopril	Lisinopril	212	41
Omeprazole	Omeprazole	209	57
Metformin Hcl	Metformin Hcl	188	45
Tamsulosin Hcl	Tamsulosin Hcl	183	50
Carvedilol	Carvedilol	174	50
Losartan Potassium	Losartan Potassium	168	45
Sertraline Hcl	Sertraline Hcl	159	41
Allopurinol	Allopurinol	154	29
Divalproex Sodium	Divalproex Sodium	142	32
Montelukast Sodium	Montelukast Sodium	133	29
Hydralazine Hcl	Hydralazine Hcl	128	29
Ipratropium-Albuterol	Ipratropium/Albuterol Sulfate	128	49
Xarelto	Rivaroxaban	118	13
Metoprolol Succinate	Metoprolol Succinate	115	36
Levetiracetam	Levetiracetam	113	24
Finasteride	Finasteride	107	23
Hydrochlorothiazide	Hydrochlorothiazide	105	29
Rosuvastatin Calcium	Rosuvastatin Calcium	103	26
Mirtazapine	Mirtazapine	102	23
Simvastatin	Simvastatin	101	23
Buspirone Hcl	Buspirone Hcl	93	21
Ciprofloxacin Hcl	Ciprofloxacin Hcl	90	69
Nifedipine Er	Nifedipine	85	13
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	85	50
Lamotrigine	Lamotrigine	84	11
Oxybutynin Chloride Er	Oxybutynin Chloride	79	12
Duloxetine Hcl	Duloxetine Hcl	68	17
Levofloxacin	Levofloxacin	68	49
Alprazolam	Alprazolam	66	23
Pravastatin Sodium	Pravastatin Sodium	63	14
Myrbetriq	Mirabegron	62	suppressed
Farxiga	Dapagliflozin Propanediol	60	suppressed
Megestrol Acetate	Megestrol Acetate	59	20
Jardiance	Empagliflozin	58	suppressed
Tradjenta	Linagliptin	58	suppressed
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	57	26
Lantus	Insulin Glargine,hum.Rec.Anlog	57	11
Meloxicam	Meloxicam	57	15
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	57	suppressed
Latanoprost	Latanoprost	56	14
Spironolactone	Spironolactone	56	21
Sucralfate	Sucralfate	56	18
Albuterol Sulfate Hfa	Albuterol Sulfate	55	20
Oxcarbazepine	Oxcarbazepine	55	suppressed
Midodrine Hcl	Midodrine Hcl	54	19
Atenolol	Atenolol	52	suppressed
Clonidine Hcl	Clonidine Hcl	51	21
Isosorbide Mononitrate Er	Isosorbide Mononitrate	48	11
Tramadol Hcl	Tramadol Hcl	47	26
Fluoxetine Hcl	Fluoxetine Hcl	46	12
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	46	37
Hydroxyzine Hcl	Hydroxyzine Hcl	44	17
Primidone	Primidone	44	suppressed
Risperidone	Risperidone	44	suppressed
Prednisone	Prednisone	43	26
Citalopram Hbr	Citalopram Hydrobromide	42	suppressed
Paroxetine Hcl	Paroxetine Hcl	41	suppressed
Ropinirole Hcl	Ropinirole Hcl	41	suppressed
Alendronate Sodium	Alendronate Sodium	40	suppressed
Ceftriaxone	Ceftriaxone Sodium	40	28
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	39	17
Diltiazem Hcl	Diltiazem Hcl	39	suppressed
Lactulose	Lactulose	39	13
Ezetimibe	Ezetimibe	38	suppressed
Amiodarone Hcl	Amiodarone Hcl	36	18
Cilostazol	Cilostazol	36	suppressed
Januvia	Sitagliptin Phosphate	36	suppressed
Aripiprazole	Aripiprazole	35	suppressed
Calcium Acetate	Calcium Acetate	35	suppressed
Glipizide	Glipizide	35	suppressed
Gemtesa	Vibegron	34	suppressed
Methocarbamol	Methocarbamol	34	suppressed
Rexulti	Brexpiprazole	34	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	33	29
Azithromycin	Azithromycin	33	21
Entresto	Sacubitril/Valsartan	33	11
Glimepiride	Glimepiride	33	suppressed
Insulin Lispro	Insulin Lispro	33	11
Ondansetron Hcl	Ondansetron Hcl	33	27
Bupropion Xl	Bupropion Hcl	32	suppressed
Digoxin	Digoxin	32	suppressed
Warfarin Sodium	Warfarin Sodium	32	suppressed
Ondansetron Odt	Ondansetron	31	20
Oxybutynin Chloride	Oxybutynin Chloride	31	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	29	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	29	suppressed
Humulin R	Insulin Regular, Human	29	suppressed
Sodium Chloride	0.9 % Sodium Chloride	28	18
Fludrocortisone Acetate	Fludrocortisone Acetate	27	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	26	suppressed
Levalbuterol Hcl	Levalbuterol Hcl	26	12
Carbidopa-Levodopa	Carbidopa/Levodopa	25	suppressed
Ertapenem	Ertapenem Sodium	25	11
Valproic Acid	Valproic Acid (As Sodium Salt)	25	suppressed
Olmesartan Medoxomil	Olmesartan Medoxomil	24	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	24	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	24	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	24	12
Celecoxib	Celecoxib	23	suppressed
Clonidine	Clonidine	23	suppressed
Doxycycline Hyclate	Doxycycline Hyclate	23	16
Fluconazole	Fluconazole	23	17
Albuterol Sulfate	Albuterol Sulfate	22	16
Budesonide	Budesonide	22	13
Cefepime Hcl	Cefepime Hcl	22	suppressed
Lovastatin	Lovastatin	22	suppressed
Meropenem	Meropenem	22	suppressed
Nitroglycerin Patch	Nitroglycerin	22	suppressed
Nystop	Nystatin	22	suppressed
Sevelamer Carbonate	Sevelamer Carbonate	22	suppressed
Fluticasone Propionate	Fluticasone Propionate	20	11
Insulin Lispro Kwikpen U-100	Insulin Lispro	20	suppressed
Memantine Hcl Er	Memantine Hcl	20	suppressed
Vancomycin Hcl	Vancomycin Hcl	20	11
Brilinta	Ticagrelor	19	suppressed
Bumetanide	Bumetanide	19	suppressed
Bupropion Hcl Sr	Bupropion Hcl	19	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	19	suppressed
Movantik	Naloxegol Oxalate	19	suppressed
Nystatin	Nystatin	19	15
Acetaminophen-Codeine	Acetaminophen With Codeine	18	suppressed
Auvelity	Dextromethorphan Hbr/Bupropion	18	suppressed
Baclofen	Baclofen	18	suppressed
Rivastigmine	Rivastigmine	18	suppressed
Rytary	Carbidopa/Levodopa	18	suppressed
Timolol Maleate	Timolol Maleate	18	suppressed
Fenofibrate	Fenofibrate,micronized	17	suppressed
Nitroglycerin	Nitroglycerin	17	11
Benztropine Mesylate	Benztropine Mesylate	16	suppressed
Cephalexin	Cephalexin	16	16
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	16	suppressed
Glipizide Er	Glipizide	16	suppressed
Metformin Er Osmotic	Metformin Hcl	16	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	16	suppressed
Valsartan	Valsartan	16	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	15	suppressed
Folic Acid	Folic Acid	15	suppressed
Nateglinide	Nateglinide	15	suppressed
Nebivolol Hcl	Nebivolol Hcl	15	suppressed
Pregabalin	Pregabalin	15	suppressed
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	14	suppressed
Levocetirizine Dihydrochloride	Levocetirizine Dihydrochloride	14	suppressed
Methimazole	Methimazole	14	suppressed
Metoclopramide Hcl	Metoclopramide Hcl	14	suppressed
Phenytoin	Phenytoin	14	suppressed
Potassium Citrate Er	Potassium Citrate	14	suppressed
Sotalol	Sotalol Hcl	14	suppressed
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	14	suppressed
Xeljanz	Tofacitinib Citrate	14	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	13	suppressed
Calcitriol	Calcitriol	13	suppressed
Mesalamine	Mesalamine	13	suppressed
Olanzapine	Olanzapine	13	suppressed
Trospium Chloride	Trospium Chloride	13	suppressed
Cefdinir	Cefdinir	12	12
Clonazepam	Clonazepam	12	suppressed
Clotrimazole-Betamethasone	Clotrimazole/Betamethasone Dip	12	suppressed
Cyanocobalamin Injection	Cyanocobalamin (Vitamin B-12)	12	suppressed
Gentamicin Sulfate	Gentamicin Sulfate	12	suppressed
Hydroxyzine Pamoate	Hydroxyzine Pamoate	12	suppressed
Mupirocin	Mupirocin	12	suppressed
Phenelzine Sulfate	Phenelzine Sulfate	12	suppressed
Propranolol Hcl	Propranolol Hcl	12	suppressed
Ramipril	Ramipril	12	suppressed
Repaglinide	Repaglinide	12	suppressed
Sevelamer Hcl	Sevelamer Hcl	12	suppressed
Synthroid	Levothyroxine Sodium	12	suppressed
Amantadine	Amantadine Hcl	11	suppressed
Clindamycin Hcl	Clindamycin Hcl	11	suppressed
Desmopressin Acetate	Desmopressin Acetate	11	suppressed
Diclofenac Sodium	Diclofenac Sodium	11	suppressed
Dorzolamide-Timolol	Dorzolamide Hcl/Timolol Maleat	11	suppressed
Ipratropium Bromide	Ipratropium Bromide	11	suppressed
Labetalol Hcl	Labetalol Hcl	11	suppressed
Lidocaine	Lidocaine	11	suppressed
Methenamine Hippurate	Methenamine Hippurate	11	suppressed
Novolog Mix 70-30 Flexpen	Insulin Aspart Prot/Insuln Asp	11	suppressed
Pentasa	Mesalamine	11	suppressed
Sulfasalazine	Sulfasalazine	11	suppressed
Telmisartan	Telmisartan	11	suppressed
Venlafaxine Hcl	Venlafaxine 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