Healthcare provider profile · identity verified

John D Nicolas, MD

Internal Medicine · CHICAGO, IL · NPI 1417940917

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	761	222
Amlodipine Besylate	Amlodipine Besylate	751	224
Levothyroxine Sodium	Levothyroxine Sodium	274	76
Losartan Potassium	Losartan Potassium	232	68
Irbesartan	Irbesartan	207	64
Metoprolol Succinate	Metoprolol Succinate	196	59
Metformin Hcl Er	Metformin Hcl	170	50
Rosuvastatin Calcium	Rosuvastatin Calcium	166	51
Hydrochlorothiazide	Hydrochlorothiazide	162	51
Lisinopril	Lisinopril	152	47
Ramipril	Ramipril	138	38
Tamsulosin Hcl	Tamsulosin Hcl	124	33
Alprazolam	Alprazolam	98	29
Potassium Chloride	Potassium Chloride	98	41
Chlorthalidone	Chlorthalidone	93	28
Omeprazole	Omeprazole	93	28
Pantoprazole Sodium	Pantoprazole Sodium	93	32
Escitalopram Oxalate	Escitalopram Oxalate	82	28
Eliquis	Apixaban	77	21
Metformin Hcl	Metformin Hcl	75	25
Allopurinol	Allopurinol	64	19
Lorazepam	Lorazepam	63	suppressed
Metoprolol Tartrate	Metoprolol Tartrate	63	17
Simvastatin	Simvastatin	61	21
Famotidine	Famotidine	60	19
Zolpidem Tartrate	Zolpidem Tartrate	58	11
Pravastatin Sodium	Pravastatin Sodium	56	16
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	47	11
Gabapentin	Gabapentin	46	17
Ozempic	Semaglutide	44	suppressed
Synthroid	Levothyroxine Sodium	41	suppressed
Jardiance	Empagliflozin	38	suppressed
Albuterol Sulfate Hfa	Albuterol Sulfate	36	14
Fluticasone Propionate	Fluticasone Propionate	36	18
Ezetimibe	Ezetimibe	31	suppressed
Valacyclovir	Valacyclovir Hcl	31	12
Atenolol	Atenolol	30	suppressed
Carvedilol	Carvedilol	30	suppressed
Clonazepam	Clonazepam	30	suppressed
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	29	suppressed
Olmesartan Medoxomil	Olmesartan Medoxomil	28	suppressed
Sertraline Hcl	Sertraline Hcl	28	suppressed
Furosemide	Furosemide	27	12
Tramadol Hcl	Tramadol Hcl	25	suppressed
Bupropion Xl	Bupropion Hcl	24	suppressed
Diazepam	Diazepam	24	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	24	suppressed
Clopidogrel	Clopidogrel Bisulfate	22	suppressed
Colchicine	Colchicine	22	suppressed
Trazodone Hcl	Trazodone Hcl	22	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	21	suppressed
Finasteride	Finasteride	20	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	20	suppressed
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	19	suppressed
Bumetanide	Bumetanide	18	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	18	suppressed
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	18	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	18	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	17	suppressed
Midodrine Hcl	Midodrine Hcl	17	suppressed
Amoxicillin	Amoxicillin	16	suppressed
Januvia	Sitagliptin Phosphate	16	suppressed
Telmisartan	Telmisartan	16	suppressed
Azelastine Hcl	Azelastine Hcl	15	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	15	suppressed
Montelukast Sodium	Montelukast Sodium	15	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	15	11
Celecoxib	Celecoxib	14	suppressed
Lidocaine	Lidocaine	14	suppressed
Warfarin Sodium	Warfarin Sodium	14	suppressed
Mesalamine	Mesalamine	13	suppressed
Zaleplon	Zaleplon	13	suppressed
Dextroamphetamine-Amphetamine	Dextroamphetamine/Amphetamine	12	suppressed
Enalapril Maleate	Enalapril Maleate	12	suppressed
Fludrocortisone Acetate	Fludrocortisone Acetate	12	suppressed
Nebivolol Hcl	Nebivolol Hcl	12	suppressed
Paroxetine Hcl	Paroxetine Hcl	12	suppressed
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	11	suppressed
Ezetimibe-Simvastatin	Ezetimibe/Simvastatin	11	suppressed
Fenofibrate	Fenofibrate Nanocrystallized	11	suppressed
Mirtazapine	Mirtazapine	11	suppressed
Repatha Sureclick	Evolocumab	11	suppressed
Tizanidine Hcl	Tizanidine Hcl	11	suppressed
Verapamil Er	Verapamil 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