Healthcare provider profile · identity verified

Robert J Grass, MD

Internal Medicine · FOND DU LAC, WI · NPI 1689665093

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	356	95
Amlodipine Besylate	Amlodipine Besylate	218	62
Omeprazole	Omeprazole	181	38
Simvastatin	Simvastatin	174	45
Lisinopril	Lisinopril	173	53
Losartan Potassium	Losartan Potassium	168	39
Levothyroxine Sodium	Levothyroxine Sodium	161	32
Hydrochlorothiazide	Hydrochlorothiazide	155	52
Pantoprazole Sodium	Pantoprazole Sodium	139	33
Gabapentin	Gabapentin	124	32
Sertraline Hcl	Sertraline Hcl	122	27
Carvedilol	Carvedilol	116	24
Lorazepam	Lorazepam	105	27
Potassium Chloride	Potassium Chloride	90	26
Glipizide Er	Glipizide	89	19
Metoprolol Succinate	Metoprolol Succinate	89	24
Eliquis	Apixaban	83	18
Montelukast Sodium	Montelukast Sodium	79	18
Allopurinol	Allopurinol	78	18
Metformin Hcl	Metformin Hcl	75	16
Metoprolol Tartrate	Metoprolol Tartrate	71	19
Rosuvastatin Calcium	Rosuvastatin Calcium	70	18
Furosemide	Furosemide	68	17
Tamsulosin Hcl	Tamsulosin Hcl	65	18
Meloxicam	Meloxicam	56	18
Duloxetine Hcl	Duloxetine Hcl	55	15
Metformin Hcl Er	Metformin Hcl	54	14
Albuterol Sulfate Hfa	Albuterol Sulfate	53	21
Celecoxib	Celecoxib	48	18
Finasteride	Finasteride	42	13
Warfarin Sodium	Warfarin Sodium	42	14
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	40	suppressed
Glipizide	Glipizide	40	suppressed
Fluticasone Propionate	Fluticasone Propionate	39	21
Clopidogrel	Clopidogrel Bisulfate	38	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	38	suppressed
Donepezil Hcl	Donepezil Hcl	35	suppressed
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	34	11
Alprazolam	Alprazolam	31	suppressed
Ezetimibe	Ezetimibe	31	suppressed
Lovastatin	Lovastatin	31	suppressed
Escitalopram Oxalate	Escitalopram Oxalate	30	suppressed
Glipizide-Metformin	Glipizide/Metformin Hcl	29	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	29	11
Diclofenac Sodium	Diclofenac Sodium	28	suppressed
Ropinirole Hcl	Ropinirole Hcl	28	suppressed
Trulicity	Dulaglutide	28	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	26	suppressed
Tramadol Hcl	Tramadol Hcl	26	13
Klor-Con M20	Potassium Chloride	25	suppressed
Synthroid	Levothyroxine Sodium	25	suppressed
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	24	suppressed
Lantus	Insulin Glargine,hum.Rec.Anlog	24	suppressed
Ondansetron Hcl	Ondansetron Hcl	24	suppressed
Fenofibrate	Fenofibrate	23	suppressed
Memantine Hcl	Memantine Hcl	22	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	21	suppressed
Bumetanide	Bumetanide	21	suppressed
Jardiance	Empagliflozin	21	suppressed
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	21	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	21	suppressed
Amoxicillin	Amoxicillin	20	12
Bupropion Hcl Sr	Bupropion Hcl	20	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	20	suppressed
Spironolactone	Spironolactone	20	suppressed
Trazodone Hcl	Trazodone Hcl	20	suppressed
Chlorthalidone	Chlorthalidone	19	suppressed
Enalapril Maleate	Enalapril Maleate	19	suppressed
Famotidine	Famotidine	19	suppressed
Ipratropium Bromide	Ipratropium Bromide	19	suppressed
Bupropion Xl	Bupropion Hcl	18	suppressed
Citalopram Hbr	Citalopram Hydrobromide	18	suppressed
Glimepiride	Glimepiride	18	suppressed
Ozempic	Semaglutide	18	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	18	suppressed
Clonazepam	Clonazepam	17	suppressed
Combivent Respimat	Ipratropium/Albuterol Sulfate	17	suppressed
Levetiracetam	Levetiracetam	17	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	17	suppressed
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	17	suppressed
Propranolol Hcl	Propranolol Hcl	17	suppressed
Tizanidine Hcl	Tizanidine Hcl	17	suppressed
Torsemide	Torsemide	17	suppressed
Metolazone	Metolazone	16	suppressed
Nabumetone	Nabumetone	16	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	16	suppressed
Atenolol	Atenolol	15	suppressed
Autoshield Duo Pen Needle	Pen Needle,dual Safety,diabetc	15	suppressed
Baclofen	Baclofen	15	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	15	suppressed
Januvia	Sitagliptin Phosphate	15	suppressed
Meclizine Hcl	Meclizine Hcl	15	11
Oxycodone Hcl	Oxycodone Hcl	15	suppressed
Valsartan	Valsartan	15	suppressed
Wixela Inhub	Fluticasone Propion/Salmeterol	15	suppressed
Bisoprolol Fumarate	Bisoprolol Fumarate	14	suppressed
Buspirone Hcl	Buspirone Hcl	14	suppressed
Mirtazapine	Mirtazapine	14	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	14	suppressed
Prednisone	Prednisone	14	suppressed
Captopril	Captopril	13	suppressed
Clonidine Hcl	Clonidine Hcl	13	suppressed
Clotrimazole	Clotrimazole	13	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	13	suppressed
Temazepam	Temazepam	13	suppressed
Arnuity Ellipta	Fluticasone Furoate	12	suppressed
Digoxin	Digoxin	12	suppressed
Hydralazine Hcl	Hydralazine Hcl	12	suppressed
Methadone Hcl	Methadone Hcl	12	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	12	suppressed
Terazosin Hcl	Terazosin Hcl	12	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	12	suppressed
Ultra-Fine Nano Pen Needle	Pen Needle, Diabetic	12	suppressed
Advair Hfa	Fluticasone Propion/Salmeterol	11	suppressed
Colchicine	Colchicine	11	suppressed
Diazepam	Diazepam	11	suppressed
Gemfibrozil	Gemfibrozil	11	suppressed
Spiriva Handihaler	Tiotropium Bromide	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