Healthcare provider profile · identity verified

Nathan R. Walker, M.D.

Internal Medicine · CHAMPAIGN, IL · NPI 1629087325

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	1048	287
Levothyroxine Sodium	Levothyroxine Sodium	692	178
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	653	125
Amlodipine Besylate	Amlodipine Besylate	650	201
Lisinopril	Lisinopril	591	172
Losartan Potassium	Losartan Potassium	391	117
Rosuvastatin Calcium	Rosuvastatin Calcium	380	130
Hydrochlorothiazide	Hydrochlorothiazide	350	108
Omeprazole	Omeprazole	339	103
Metoprolol Succinate	Metoprolol Succinate	320	88
Metformin Hcl	Metformin Hcl	318	92
Tramadol Hcl	Tramadol Hcl	270	63
Gabapentin	Gabapentin	247	68
Albuterol Sulfate Hfa	Albuterol Sulfate	246	78
Simvastatin	Simvastatin	241	69
Pantoprazole Sodium	Pantoprazole Sodium	240	70
Trazodone Hcl	Trazodone Hcl	239	70
Eliquis	Apixaban	219	49
Furosemide	Furosemide	218	60
Allopurinol	Allopurinol	212	57
Tamsulosin Hcl	Tamsulosin Hcl	200	61
Carvedilol	Carvedilol	190	55
Jardiance	Empagliflozin	187	49
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	184	51
Alendronate Sodium	Alendronate Sodium	179	55
Duloxetine Hcl	Duloxetine Hcl	176	45
Citalopram Hbr	Citalopram Hydrobromide	175	42
Potassium Chloride	Potassium Chloride	171	45
Pravastatin Sodium	Pravastatin Sodium	167	45
Glimepiride	Glimepiride	163	49
Tizanidine Hcl	Tizanidine Hcl	159	46
Ozempic	Semaglutide	157	30
Methylprednisolone	Methylprednisolone	153	126
Metoprolol Tartrate	Metoprolol Tartrate	150	42
Alprazolam	Alprazolam	149	45
Valsartan	Valsartan	146	50
Metformin Hcl Er	Metformin Hcl	137	49
Montelukast Sodium	Montelukast Sodium	128	34
Acetaminophen-Codeine	Acetaminophen With Codeine	123	50
Lorazepam	Lorazepam	123	29
Fluticasone Propionate	Fluticasone Propionate	120	38
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	117	17
Olmesartan Medoxomil	Olmesartan Medoxomil	114	35
Bupropion Xl	Bupropion Hcl	108	32
Doxycycline Hyclate	Doxycycline Hyclate	107	93
Escitalopram Oxalate	Escitalopram Oxalate	105	35
Clonazepam	Clonazepam	100	20
Hydralazine Hcl	Hydralazine Hcl	99	34
Finasteride	Finasteride	96	29
Xarelto	Rivaroxaban	94	23
Mounjaro	Tirzepatide	91	20
Sertraline Hcl	Sertraline Hcl	91	22
Spironolactone	Spironolactone	90	33
Prednisone	Prednisone	86	65
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	84	15
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	83	23
Pregabalin	Pregabalin	81	25
Fluoxetine Hcl	Fluoxetine Hcl	79	20
Zolpidem Tartrate	Zolpidem Tartrate	75	22
Clopidogrel	Clopidogrel Bisulfate	74	24
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	73	18
Triamcinolone Acetonide	Triamcinolone Acetonide	72	30
Ondansetron Hcl	Ondansetron Hcl	70	23
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	67	23
Meloxicam	Meloxicam	66	17
Testosterone Cypionate	Testosterone Cypionate	64	20
Amitriptyline Hcl	Amitriptyline Hcl	63	18
Famotidine	Famotidine	63	18
Ropinirole Hcl	Ropinirole Hcl	62	16
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	60	18
Celecoxib	Celecoxib	56	16
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	56	15
Topiramate	Topiramate	55	22
Lovastatin	Lovastatin	53	16
Buspirone Hcl	Buspirone Hcl	52	13
Valacyclovir	Valacyclovir Hcl	49	22
Venlafaxine Hcl Er	Venlafaxine Hcl	49	15
Paroxetine Hcl	Paroxetine Hcl	48	12
Risperidone	Risperidone	48	suppressed
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	48	14
Cephalexin	Cephalexin	46	28
Lamotrigine	Lamotrigine	45	suppressed
Ventolin Hfa	Albuterol Sulfate	44	18
Ezetimibe	Ezetimibe	42	12
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	41	28
Verapamil Er	Verapamil Hcl	41	11
Anoro Ellipta	Umeclidinium Brm/Vilanterol Tr	39	suppressed
Irbesartan	Irbesartan	39	13
Dicyclomine Hcl	Dicyclomine Hcl	37	12
Rybelsus	Semaglutide	36	suppressed
Baclofen	Baclofen	34	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	33	26
Atenolol	Atenolol	33	suppressed
Breztri Aerosphere	Budesonide/Glycopyr/Formoterol	33	suppressed
Econazole Nitrate	Econazole Nitrate	33	suppressed
Entresto	Sacubitril/Valsartan	33	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	33	suppressed
Paxlovid	Nirmatrelvir/Ritonavir	33	33
Propranolol Hcl Er	Propranolol Hcl	33	12
Fenofibrate	Fenofibrate	32	suppressed
Lansoprazole	Lansoprazole	32	11
Oxycodone Hcl	Oxycodone Hcl	31	suppressed
Synthroid	Levothyroxine Sodium	31	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	30	suppressed
Azelastine Hcl	Azelastine Hcl	30	suppressed
Breo Ellipta	Fluticasone/Vilanterol	30	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	30	11
Propranolol Hcl	Propranolol Hcl	30	12
Chlorthalidone	Chlorthalidone	29	11
Diazepam	Diazepam	29	suppressed
Klor-Con M10	Potassium Chloride	29	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	29	suppressed
Trulicity	Dulaglutide	29	suppressed
Benazepril Hcl	Benazepril Hcl	28	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	28	suppressed
Hydrocortisone	Hydrocortisone	28	suppressed
Linzess	Linaclotide	28	suppressed
Nortriptyline Hcl	Nortriptyline Hcl	28	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	27	suppressed
Latanoprost	Latanoprost	27	suppressed
Meclizine Hcl	Meclizine Hcl	27	suppressed
Morphine Sulfate Er	Morphine Sulfate	27	suppressed
Belsomra	Suvorexant	26	suppressed
Febuxostat	Febuxostat	26	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	26	suppressed
Symbicort	Budesonide/Formoterol Fumarate	26	suppressed
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	25	suppressed
Ondansetron Odt	Ondansetron	25	14
Sumatriptan Succinate	Sumatriptan Succinate	25	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	24	suppressed
Clonidine Hcl	Clonidine Hcl	23	suppressed
Dextroamphetamine-Amphetamine	Dextroamphetamine/Amphetamine	23	suppressed
Donepezil Hcl	Donepezil Hcl	23	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	23	suppressed
Minoxidil	Minoxidil	23	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	23	suppressed
Amoxicillin	Amoxicillin	22	18
Bupropion Hcl Sr	Bupropion Hcl	22	suppressed
Desvenlafaxine Succinate Er	Desvenlafaxine Succinate	22	suppressed
Estradiol	Estradiol	22	suppressed
Glipizide	Glipizide	22	suppressed
Memantine Hcl	Memantine Hcl	21	suppressed
Repatha Sureclick	Evolocumab	21	suppressed
Warfarin Sodium	Warfarin Sodium	21	suppressed
Fluconazole	Fluconazole	20	suppressed
Nitroglycerin	Nitroglycerin	20	suppressed
Naproxen	Naproxen	19	suppressed
Myrbetriq	Mirabegron	18	suppressed
Azithromycin	Azithromycin	17	15
Colchicine	Colchicine	17	11
Diclofenac Sodium	Diclofenac Sodium	17	suppressed
Diltiazem 24hr Er	Diltiazem Hcl	17	suppressed
Eplerenone	Eplerenone	17	suppressed
Methocarbamol	Methocarbamol	17	suppressed
Promethazine Hcl	Promethazine Hcl	17	suppressed
Silodosin	Silodosin	17	suppressed
Synjardy Xr	Empagliflozin/Metformin Hcl	17	suppressed
Cilostazol	Cilostazol	16	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	16	15
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	16	suppressed
Nexletol	Bempedoic Acid	16	suppressed
Bupropion Hcl	Bupropion Hcl	15	suppressed
Carbidopa-Levodopa	Carbidopa/Levodopa	15	suppressed
Fentanyl	Fentanyl	14	suppressed
Glipizide Er	Glipizide	14	suppressed
Indomethacin	Indomethacin	14	suppressed
Ketoconazole	Ketoconazole	14	suppressed
Klor-Con M20	Potassium Chloride	14	suppressed
Metolazone	Metolazone	14	suppressed
Tenofovir Disoproxil Fumarate	Tenofovir Disoproxil Fumarate	14	suppressed
Timolol Maleate	Timolol Maleate	14	suppressed
Tresiba Flextouch U-100	Insulin Degludec	14	suppressed
Abacavir	Abacavir Sulfate	13	suppressed
Acyclovir	Acyclovir	13	suppressed
Ipratropium Bromide	Ipratropium Bromide	13	suppressed
Isentress	Raltegravir Potassium	13	suppressed
Janumet Xr	Sitagliptin Phos/Metformin Hcl	13	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	13	suppressed
Ramipril	Ramipril	13	suppressed
Doxycycline Monohydrate	Doxycycline Monohydrate	12	suppressed
Metronidazole	Metronidazole	12	12
Movantik	Naloxegol Oxalate	12	suppressed
Mupirocin	Mupirocin	12	suppressed
Pregabalin Er	Pregabalin	12	suppressed
Qvar Redihaler	Beclomethasone Dipropionate	12	suppressed
Toujeo Max Solostar	Insulin Glargine,hum.Rec.Anlog	12	suppressed
Anastrozole	Anastrozole	11	suppressed
Aripiprazole	Aripiprazole	11	suppressed
Autoshield Duo Pen Needle	Pen Needle,dual Safety,diabetc	11	suppressed
Breyna	Budesonide/Formoterol Fumarate	11	suppressed
Brimonidine Tartrate	Brimonidine Tartrate	11	suppressed
Cholestyramine	Cholestyramine (With Sugar)	11	suppressed
Colestipol Hcl	Colestipol Hcl	11	suppressed
Levetiracetam	Levetiracetam	11	suppressed
Mirabegron Er	Mirabegron	11	suppressed
Nystatin	Nystatin	11	suppressed
Primidone	Primidone	11	suppressed
Rizatriptan	Rizatriptan Benzoate	11	suppressed
Telmisartan	Telmisartan	11	suppressed
Ultra-Fine Mini Pen Needle	Pen Needle, Diabetic	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