Healthcare provider profile · identity verified

Glenn Allison, M.D.

Internal Medicine · LEOMINSTER, MA · NPI 1497745848

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	709	191
Amlodipine Besylate	Amlodipine Besylate	366	100
Omeprazole	Omeprazole	287	85
Metoprolol Succinate	Metoprolol Succinate	248	74
Lisinopril	Lisinopril	246	71
Levothyroxine Sodium	Levothyroxine Sodium	198	51
Metformin Hcl	Metformin Hcl	193	54
Eliquis	Apixaban	168	42
Gabapentin	Gabapentin	160	45
Rosuvastatin Calcium	Rosuvastatin Calcium	150	47
Simvastatin	Simvastatin	143	37
Losartan Potassium	Losartan Potassium	139	42
Albuterol Sulfate Hfa	Albuterol Sulfate	135	40
Allopurinol	Allopurinol	134	35
Furosemide	Furosemide	128	40
Tamsulosin Hcl	Tamsulosin Hcl	126	34
Hydrochlorothiazide	Hydrochlorothiazide	120	39
Jardiance	Empagliflozin	118	32
Trazodone Hcl	Trazodone Hcl	111	30
Sertraline Hcl	Sertraline Hcl	101	27
Oxycodone Hcl	Oxycodone Hcl	78	suppressed
Atenolol	Atenolol	77	22
Lorazepam	Lorazepam	71	20
Valsartan	Valsartan	71	21
Pravastatin Sodium	Pravastatin Sodium	65	21
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	58	suppressed
Spironolactone	Spironolactone	56	17
Indapamide	Indapamide	54	19
Naproxen	Naproxen	48	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	48	suppressed
Fluticasone Propionate	Fluticasone Propionate	47	21
Mirtazapine	Mirtazapine	47	20
Tramadol Hcl	Tramadol Hcl	47	11
Glimepiride	Glimepiride	45	suppressed
Diazepam	Diazepam	44	suppressed
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	44	suppressed
Clopidogrel	Clopidogrel Bisulfate	43	13
Metformin Hcl Er	Metformin Hcl	43	12
Pregabalin	Pregabalin	42	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	40	13
Metoprolol Tartrate	Metoprolol Tartrate	40	13
Fluoxetine Hcl	Fluoxetine Hcl	39	12
Alendronate Sodium	Alendronate Sodium	38	12
Carvedilol	Carvedilol	38	13
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	38	suppressed
Torsemide	Torsemide	38	suppressed
Trulicity	Dulaglutide	37	suppressed
Finasteride	Finasteride	36	suppressed
Escitalopram Oxalate	Escitalopram Oxalate	35	suppressed
Ketoconazole	Ketoconazole	33	11
Pantoprazole Sodium	Pantoprazole Sodium	33	suppressed
Ozempic	Semaglutide	32	suppressed
Labetalol Hcl	Labetalol Hcl	31	suppressed
Famotidine	Famotidine	30	suppressed
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	30	11
Doxazosin Mesylate	Doxazosin Mesylate	29	suppressed
Azithromycin	Azithromycin	28	15
Ezetimibe	Ezetimibe	28	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	28	14
Bupropion Xl	Bupropion Hcl	27	suppressed
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	27	suppressed
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	26	suppressed
Clotrimazole	Clotrimazole	26	suppressed
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	26	suppressed
Colchicine	Colchicine	25	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	25	13
Olmesartan Medoxomil	Olmesartan Medoxomil	23	suppressed
Paroxetine Hcl	Paroxetine Hcl	23	suppressed
Prednisone	Prednisone	23	16
Klor-Con M20	Potassium Chloride	22	suppressed
Potassium Chloride	Potassium Chloride	22	suppressed
Baclofen	Baclofen	21	suppressed
Glipizide Er	Glipizide	21	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	21	suppressed
Synthroid	Levothyroxine Sodium	21	suppressed
Valacyclovir	Valacyclovir Hcl	20	suppressed
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	20	suppressed
Duloxetine Hcl	Duloxetine Hcl	19	suppressed
Hydrocortisone	Hydrocortisone	19	12
Donepezil Hcl	Donepezil Hcl	18	suppressed
Levocetirizine Dihydrochloride	Levocetirizine Dihydrochloride	18	suppressed
Propranolol Hcl	Propranolol Hcl	18	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	18	suppressed
Wixela Inhub	Fluticasone Propion/Salmeterol	18	suppressed
Chlorthalidone	Chlorthalidone	17	suppressed
Citalopram Hbr	Citalopram Hydrobromide	17	suppressed
Ibuprofen	Ibuprofen	17	suppressed
Lidocaine	Lidocaine	17	suppressed
Ventolin Hfa	Albuterol Sulfate	17	suppressed
Acetaminophen-Codeine	Acetaminophen With Codeine	16	suppressed
Dilt-Xr	Diltiazem Hcl	16	suppressed
Enalapril Maleate	Enalapril Maleate	16	suppressed
Entresto	Sacubitril/Valsartan	16	suppressed
Meclizine Hcl	Meclizine Hcl	16	suppressed
Topiramate	Topiramate	16	suppressed
Warfarin Sodium	Warfarin Sodium	16	suppressed
Calcitriol	Calcitriol	15	suppressed
Ipratropium Bromide	Ipratropium Bromide	15	suppressed
Advair Hfa	Fluticasone Propion/Salmeterol	14	suppressed
Lovastatin	Lovastatin	14	suppressed
Montelukast Sodium	Montelukast Sodium	14	suppressed
Xarelto	Rivaroxaban	14	suppressed
Breo Ellipta	Fluticasone/Vilanterol	13	suppressed
Celecoxib	Celecoxib	13	suppressed
Dabigatran Etexilate	Dabigatran Etexilate Mesylate	13	suppressed
Doxepin Hcl	Doxepin Hcl	13	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	13	13
Amoxicillin	Amoxicillin	12	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	12	suppressed
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	12	suppressed
Loperamide	Loperamide Hcl	12	suppressed
Memantine Hcl	Memantine Hcl	12	suppressed
Nortriptyline Hcl	Nortriptyline Hcl	12	suppressed
Ultra-Fine Mini Pen Needle	Pen Needle, Diabetic	12	suppressed
Ammonium Lactate	Ammonium Lactate	11	suppressed
Buspirone Hcl	Buspirone Hcl	11	suppressed
Methadone Hcl	Methadone Hcl	11	suppressed
Nifedipine Er	Nifedipine	11	suppressed
Sildenafil Citrate	Sildenafil Citrate	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