Healthcare provider profile · identity verified

Gregory Haman, M.D.

Internal Medicine · WILLIMANTIC, CT · NPI 1033590773

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	849	259
Amlodipine Besylate	Amlodipine Besylate	778	227
Losartan Potassium	Losartan Potassium	434	132
Rosuvastatin Calcium	Rosuvastatin Calcium	372	116
Metoprolol Succinate	Metoprolol Succinate	354	102
Hydrochlorothiazide	Hydrochlorothiazide	334	104
Levothyroxine Sodium	Levothyroxine Sodium	330	101
Lisinopril	Lisinopril	304	96
Gabapentin	Gabapentin	281	83
Metformin Hcl	Metformin Hcl	273	77
Pantoprazole Sodium	Pantoprazole Sodium	241	76
Ozempic	Semaglutide	208	47
Albuterol Sulfate Hfa	Albuterol Sulfate	187	64
Allopurinol	Allopurinol	171	46
Metformin Hcl Er	Metformin Hcl	167	59
Tamsulosin Hcl	Tamsulosin Hcl	165	53
Jardiance	Empagliflozin	162	44
Omeprazole	Omeprazole	151	52
Sertraline Hcl	Sertraline Hcl	142	51
Simvastatin	Simvastatin	139	47
Potassium Chloride	Potassium Chloride	131	36
Furosemide	Furosemide	129	42
Eliquis	Apixaban	125	37
Valsartan	Valsartan	122	36
Alprazolam	Alprazolam	112	36
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	99	28
Atenolol	Atenolol	97	29
Clonidine Hcl	Clonidine Hcl	97	28
Fluticasone Propionate	Fluticasone Propionate	91	36
Prednisone	Prednisone	86	42
Pioglitazone Hcl	Pioglitazone Hcl	82	19
Ezetimibe	Ezetimibe	77	23
Januvia	Sitagliptin Phosphate	72	24
Duloxetine Hcl	Duloxetine Hcl	68	27
Xarelto	Rivaroxaban	68	23
Pravastatin Sodium	Pravastatin Sodium	67	16
Fluoxetine Hcl	Fluoxetine Hcl	66	16
Alendronate Sodium	Alendronate Sodium	65	25
Donepezil Hcl	Donepezil Hcl	65	13
Escitalopram Oxalate	Escitalopram Oxalate	65	20
Mirtazapine	Mirtazapine	65	14
Finasteride	Finasteride	64	18
Glipizide Er	Glipizide	63	21
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	61	25
Tramadol Hcl	Tramadol Hcl	60	23
Trazodone Hcl	Trazodone Hcl	58	19
Valacyclovir	Valacyclovir Hcl	56	13
Clopidogrel	Clopidogrel Bisulfate	55	12
Fenofibrate	Fenofibrate Nanocrystallized	55	17
Montelukast Sodium	Montelukast Sodium	55	17
Carvedilol	Carvedilol	53	18
Benazepril Hcl	Benazepril Hcl	49	17
Enalapril Maleate	Enalapril Maleate	49	15
Spironolactone	Spironolactone	49	21
Amitriptyline Hcl	Amitriptyline Hcl	48	13
Hydralazine Hcl	Hydralazine Hcl	48	14
Zolpidem Tartrate	Zolpidem Tartrate	48	17
Pregabalin	Pregabalin	46	20
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	46	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	43	11
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	42	11
Mounjaro	Tirzepatide	41	suppressed
Oxycodone Hcl	Oxycodone Hcl	41	14
Triamcinolone Acetonide	Triamcinolone Acetonide	41	23
Bupropion Xl	Bupropion Hcl	39	13
Famotidine	Famotidine	39	16
Methocarbamol	Methocarbamol	38	suppressed
Colchicine	Colchicine	36	18
Glipizide	Glipizide	36	suppressed
Bupropion Hcl	Bupropion Hcl	35	suppressed
Ventolin Hfa	Albuterol Sulfate	35	suppressed
Amlodipine-Valsartan	Amlodipine Besylate/Valsartan	34	suppressed
Lansoprazole	Lansoprazole	34	suppressed
Tizanidine Hcl	Tizanidine Hcl	33	suppressed
Nifedipine Er	Nifedipine	32	suppressed
Paroxetine Hcl	Paroxetine Hcl	32	suppressed
Synthroid	Levothyroxine Sodium	32	11
Meclizine Hcl	Meclizine Hcl	31	11
Hydroxyzine Hcl	Hydroxyzine Hcl	30	14
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	30	17
Diclofenac Sodium	Diclofenac Sodium	29	11
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	29	suppressed
Mometasone Furoate	Mometasone Furoate	28	suppressed
Ultra-Fine Short Pen Needle	Pen Needle, Diabetic	28	11
Breo Ellipta	Fluticasone/Vilanterol	27	suppressed
Hydromorphone Er	Hydromorphone Hcl	26	suppressed
Verapamil Er	Verapamil Hcl	25	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	24	suppressed
Ibuprofen	Ibuprofen	24	suppressed
Nebivolol Hcl	Nebivolol Hcl	24	suppressed
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	24	suppressed
Anoro Ellipta	Umeclidinium Brm/Vilanterol Tr	23	suppressed
Chlorthalidone	Chlorthalidone	23	suppressed
Lactulose	Lactulose	23	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	22	suppressed
Metoprolol Tartrate	Metoprolol Tartrate	21	suppressed
Risedronate Sodium	Risedronate Sodium	21	suppressed
Buspirone Hcl	Buspirone Hcl	20	suppressed
Citalopram Hbr	Citalopram Hydrobromide	20	suppressed
Diazepam	Diazepam	20	suppressed
Humalog Kwikpen U-100	Insulin Lispro	20	suppressed
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	20	suppressed
Spiriva Respimat	Tiotropium Bromide	20	suppressed
Olmesartan Medoxomil	Olmesartan Medoxomil	19	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	19	suppressed
Azithromycin	Azithromycin	18	17
Baclofen	Baclofen	18	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	18	suppressed
Levocetirizine Dihydrochloride	Levocetirizine Dihydrochloride	18	suppressed
Linzess	Linaclotide	18	suppressed
Lovastatin	Lovastatin	18	suppressed
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	18	suppressed
Adderall Xr	Dextroamphetamine/Amphetamine	17	suppressed
Clonazepam	Clonazepam	17	suppressed
Sildenafil Citrate	Sildenafil Citrate	17	suppressed
Testosterone	Testosterone	17	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	16	suppressed
Benazepril-Hydrochlorothiazide	Benazepril/Hydrochlorothiazide	16	suppressed
Celecoxib	Celecoxib	16	suppressed
Fentanyl	Fentanyl	16	suppressed
Irbesartan	Irbesartan	16	suppressed
Lorazepam	Lorazepam	16	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	16	suppressed
Desloratadine	Desloratadine	15	suppressed
Febuxostat	Febuxostat	15	suppressed
Levemir Flexpen	Insulin Detemir	15	suppressed
Metronidazole	Metronidazole	15	suppressed
Morphine Sulfate	Morphine Sulfate	15	suppressed
Rabeprazole Sodium	Rabeprazole Sodium	15	suppressed
Terazosin Hcl	Terazosin Hcl	15	suppressed
Tradjenta	Linagliptin	15	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	14	suppressed
Clobetasol Propionate	Clobetasol Propionate	14	suppressed
Farxiga	Dapagliflozin Propanediol	14	suppressed
Glimepiride	Glimepiride	14	suppressed
Insulin Lispro Kwikpen U-100	Insulin Lispro	14	suppressed
Memantine Hcl	Memantine Hcl	14	suppressed
Oxycontin	Oxycodone Hcl	14	suppressed
Alfuzosin Hcl Er	Alfuzosin Hcl	13	suppressed
Azelastine Hcl	Azelastine Hcl	13	suppressed
Fosinopril Sodium	Fosinopril Sodium	13	suppressed
Midodrine Hcl	Midodrine Hcl	13	suppressed
Nortriptyline Hcl	Nortriptyline Hcl	13	suppressed
Temazepam	Temazepam	13	suppressed
Torsemide	Torsemide	13	suppressed
Amlodipine-Atorvastatin	Amlodipine/Atorvastatin	12	suppressed
Amoxicillin	Amoxicillin	12	suppressed
Budesonide-Formoterol Fumarate	Budesonide/Formoterol Fumarate	12	suppressed
Buprenorphine-Naloxone	Buprenorphine Hcl/Naloxone Hcl	12	suppressed
Lidocaine	Lidocaine	12	suppressed
Suboxone	Buprenorphine Hcl/Naloxone Hcl	12	suppressed
Trulicity	Dulaglutide	12	suppressed
Ultra-Fine Nano Pen Needle	Pen Needle, Diabetic	12	suppressed
Warfarin Sodium	Warfarin Sodium	12	suppressed
Carisoprodol	Carisoprodol	11	suppressed
Ketoconazole	Ketoconazole	11	suppressed
Loperamide	Loperamide Hcl	11	suppressed
Meloxicam	Meloxicam	11	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	11	11
Olmesartan-Hydrochlorothiazide	Olmesartan/Hydrochlorothiazide	11	suppressed
Propranolol Hcl Er	Propranolol Hcl	11	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	11	suppressed
Tramadol Hcl-Acetaminophen	Tramadol Hcl/Acetaminophen	11	suppressed
Zolpidem Tartrate Er	Zolpidem Tartrate	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