Healthcare provider profile · identity verified

Matthew P Chamberlain, MD

Internal Medicine · ROCKY MOUNT, NC · NPI 1053305722

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
Amlodipine Besylate	Amlodipine Besylate	711	166
Atorvastatin Calcium	Atorvastatin Calcium	630	145
Pantoprazole Sodium	Pantoprazole Sodium	446	112
Gabapentin	Gabapentin	357	77
Metoprolol Succinate	Metoprolol Succinate	354	91
Rosuvastatin Calcium	Rosuvastatin Calcium	332	79
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	318	78
Levothyroxine Sodium	Levothyroxine Sodium	306	70
Furosemide	Furosemide	297	85
Alprazolam	Alprazolam	250	66
Omeprazole	Omeprazole	235	50
Losartan Potassium	Losartan Potassium	226	53
Pravastatin Sodium	Pravastatin Sodium	217	58
Hydrochlorothiazide	Hydrochlorothiazide	212	55
Metformin Hcl Er	Metformin Hcl	199	53
Lisinopril	Lisinopril	195	52
Metoprolol Tartrate	Metoprolol Tartrate	190	47
Fluticasone Propionate	Fluticasone Propionate	181	58
Montelukast Sodium	Montelukast Sodium	175	40
Escitalopram Oxalate	Escitalopram Oxalate	166	37
Albuterol Sulfate Hfa	Albuterol Sulfate	160	32
Tamsulosin Hcl	Tamsulosin Hcl	158	42
Valsartan	Valsartan	156	36
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	150	40
Sertraline Hcl	Sertraline Hcl	149	38
Eliquis	Apixaban	146	36
Potassium Chloride	Potassium Chloride	146	39
Simvastatin	Simvastatin	142	41
Allopurinol	Allopurinol	123	31
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	122	23
Meloxicam	Meloxicam	119	33
Mirtazapine	Mirtazapine	108	28
Oxycodone Hcl	Oxycodone Hcl	108	25
Carvedilol	Carvedilol	102	25
Duloxetine Hcl	Duloxetine Hcl	101	19
Zolpidem Tartrate	Zolpidem Tartrate	100	25
Glimepiride	Glimepiride	97	26
Lorazepam	Lorazepam	95	17
Clonidine Hcl	Clonidine Hcl	94	27
Pregabalin	Pregabalin	94	20
Jardiance	Empagliflozin	93	26
Tramadol Hcl	Tramadol Hcl	93	28
Prednisone	Prednisone	92	45
Clopidogrel	Clopidogrel Bisulfate	86	23
Metformin Hcl	Metformin Hcl	82	28
Ondansetron Hcl	Ondansetron Hcl	82	21
Clonazepam	Clonazepam	81	17
Atenolol	Atenolol	70	12
Famotidine	Famotidine	65	18
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	63	15
Tizanidine Hcl	Tizanidine Hcl	63	24
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	61	15
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	57	36
Triamcinolone Acetonide	Triamcinolone Acetonide	54	32
Ropinirole Hcl	Ropinirole Hcl	53	suppressed
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	52	14
Vitamin D2	Ergocalciferol (Vitamin D2)	52	12
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	51	16
Meclizine Hcl	Meclizine Hcl	49	24
Finasteride	Finasteride	48	suppressed
Ibuprofen	Ibuprofen	46	13
Isosorbide Mononitrate Er	Isosorbide Mononitrate	46	11
Ezetimibe	Ezetimibe	45	13
Fluoxetine Hcl	Fluoxetine Hcl	44	12
Pioglitazone Hcl	Pioglitazone Hcl	44	11
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	43	16
Xarelto	Rivaroxaban	42	suppressed
Nitroglycerin	Nitroglycerin	39	26
Bumetanide	Bumetanide	38	suppressed
Sucralfate	Sucralfate	38	15
Donepezil Hcl	Donepezil Hcl	37	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	37	suppressed
Celecoxib	Celecoxib	35	suppressed
Spironolactone	Spironolactone	35	13
Doxepin Hcl	Doxepin Hcl	34	suppressed
Ozempic	Semaglutide	34	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	34	suppressed
Diclofenac Sodium	Diclofenac Sodium	33	suppressed
Hydralazine Hcl	Hydralazine Hcl	33	12
Azithromycin	Azithromycin	32	27
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	31	suppressed
Benazepril Hcl	Benazepril Hcl	31	suppressed
Cefdinir	Cefdinir	31	28
Ciprofloxacin Hcl	Ciprofloxacin Hcl	31	21
Citalopram Hbr	Citalopram Hydrobromide	30	suppressed
Nateglinide	Nateglinide	30	suppressed
Ramipril	Ramipril	30	suppressed
Farxiga	Dapagliflozin Propanediol	29	suppressed
Glipizide	Glipizide	29	suppressed
Irbesartan	Irbesartan	29	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	28	suppressed
Januvia	Sitagliptin Phosphate	28	suppressed
Levetiracetam	Levetiracetam	28	suppressed
Synthroid	Levothyroxine Sodium	28	suppressed
Telmisartan-Hydrochlorothiazid	Telmisartan/Hydrochlorothiazid	28	suppressed
Baclofen	Baclofen	27	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	27	suppressed
Telmisartan	Telmisartan	27	suppressed
Ipratropium Bromide	Ipratropium Bromide	26	12
Linzess	Linaclotide	26	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	25	suppressed
Fludrocortisone Acetate	Fludrocortisone Acetate	25	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	23	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	23	suppressed
Clotrimazole-Betamethasone	Clotrimazole/Betamethasone Dip	22	14
Dexlansoprazole Dr	Dexlansoprazole	22	suppressed
Fluconazole	Fluconazole	22	14
Olmesartan Medoxomil	Olmesartan Medoxomil	22	suppressed
Rybelsus	Semaglutide	22	suppressed
Silver Sulfadiazine	Silver Sulfadiazine	22	suppressed
Entresto	Sacubitril/Valsartan	21	suppressed
Metoclopramide Hcl	Metoclopramide Hcl	21	suppressed
Lamotrigine	Lamotrigine	20	suppressed
Ondansetron Odt	Ondansetron	20	12
Alendronate Sodium	Alendronate Sodium	19	suppressed
Midodrine Hcl	Midodrine Hcl	19	suppressed
Venlafaxine Hcl	Venlafaxine Hcl	19	suppressed
Amoxicillin	Amoxicillin	18	11
Breo Ellipta	Fluticasone/Vilanterol	18	suppressed
Chlorthalidone	Chlorthalidone	18	suppressed
Hydrocortisone Valerate	Hydrocortisone Valerate	18	suppressed
Raloxifene Hcl	Raloxifene Hcl	18	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	18	suppressed
Breztri Aerosphere	Budesonide/Glycopyr/Formoterol	17	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	17	suppressed
Levocetirizine Dihydrochloride	Levocetirizine Dihydrochloride	17	suppressed
Naproxen	Naproxen	17	suppressed
Rabeprazole Sodium	Rabeprazole Sodium	17	suppressed
Acetaminophen-Codeine	Acetaminophen With Codeine	16	suppressed
Lactulose	Lactulose	16	suppressed
Lansoprazole	Lansoprazole	16	suppressed
Phenytoin Sodium Extended	Phenytoin Sodium Extended	16	suppressed
Ventolin Hfa	Albuterol Sulfate	16	suppressed
Zolpidem Tartrate Er	Zolpidem Tartrate	16	suppressed
Megestrol Acetate	Megestrol Acetate	15	suppressed
Novolog Flexpen	Insulin Aspart	15	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	15	suppressed
Synjardy Xr	Empagliflozin/Metformin Hcl	15	suppressed
Trazodone Hcl	Trazodone Hcl	15	suppressed
Butalbital-Acetaminophen-Caffe	Butalb/Acetaminophen/Caffeine	14	suppressed
Clonidine	Clonidine	14	suppressed
Dilt-Xr	Diltiazem Hcl	14	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	14	suppressed
Verapamil Hcl	Verapamil Hcl	14	suppressed
Cephalexin	Cephalexin	13	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	13	suppressed
Dropsafe Prep Pads	Alcohol Antiseptic Pads	13	suppressed
Hydrocortisone	Hydrocortisone	13	suppressed
Metolazone	Metolazone	13	suppressed
Multaq	Dronedarone Hcl	13	suppressed
Nystatin	Nystatin	13	suppressed
Primidone	Primidone	13	suppressed
Trospium Chloride	Trospium Chloride	13	suppressed
Trulicity	Dulaglutide	13	suppressed
Valacyclovir	Valacyclovir Hcl	13	suppressed
Desvenlafaxine Succinate Er	Desvenlafaxine Succinate	12	suppressed
Diazepam	Diazepam	12	suppressed
Diltiazem 12hr Er	Diltiazem Hcl	12	suppressed
Ketoconazole	Ketoconazole	12	suppressed
Lovastatin	Lovastatin	12	suppressed
Memantine Hcl	Memantine Hcl	12	suppressed
Mupirocin	Mupirocin	12	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	12	suppressed
Xtampza Er	Oxycodone Myristate	12	suppressed
Amiodarone Hcl	Amiodarone Hcl	11	suppressed
Bydureon Bcise	Exenatide Microspheres	11	suppressed
Divalproex Sodium Er	Divalproex Sodium	11	suppressed
Estradiol	Estradiol	11	suppressed
Klor-Con M20	Potassium Chloride	11	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	11	suppressed
Terazosin Hcl	Terazosin Hcl	11	suppressed
Warfarin Sodium	Warfarin Sodium	11	suppressed
Zaleplon	Zaleplon	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