Healthcare provider profile · identity verified

Dexter Robert Mckellar, MD

Family Practice · WALKER, MI · NPI 1336633742

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	255	108
Lisinopril	Lisinopril	182	72
Gabapentin	Gabapentin	147	48
Amlodipine Besylate	Amlodipine Besylate	142	60
Levothyroxine Sodium	Levothyroxine Sodium	116	45
Omeprazole	Omeprazole	115	52
Losartan Potassium	Losartan Potassium	90	45
Sertraline Hcl	Sertraline Hcl	84	29
Meloxicam	Meloxicam	82	37
Metoprolol Succinate	Metoprolol Succinate	82	37
Hydrochlorothiazide	Hydrochlorothiazide	74	33
Trazodone Hcl	Trazodone Hcl	73	31
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	66	22
Tamsulosin Hcl	Tamsulosin Hcl	66	28
Metformin Hcl Er	Metformin Hcl	58	21
Rosuvastatin Calcium	Rosuvastatin Calcium	57	29
Bupropion Xl	Bupropion Hcl	56	22
Escitalopram Oxalate	Escitalopram Oxalate	54	12
Metformin Hcl	Metformin Hcl	52	19
Albuterol Sulfate Hfa	Albuterol Sulfate	51	27
Carvedilol	Carvedilol	51	22
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	47	31
Alendronate Sodium	Alendronate Sodium	40	11
Prednisone	Prednisone	40	37
Eliquis	Apixaban	39	16
Simvastatin	Simvastatin	39	17
Pregabalin	Pregabalin	38	suppressed
Tramadol Hcl	Tramadol Hcl	38	11
Duloxetine Hcl	Duloxetine Hcl	37	16
Furosemide	Furosemide	37	17
Allopurinol	Allopurinol	35	14
Jardiance	Empagliflozin	34	15
Famotidine	Famotidine	31	13
Fluticasone Propionate	Fluticasone Propionate	29	14
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	29	12
Amitriptyline Hcl	Amitriptyline Hcl	27	suppressed
Buspirone Hcl	Buspirone Hcl	27	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	27	11
Mounjaro	Tirzepatide	26	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	26	suppressed
Celecoxib	Celecoxib	24	suppressed
Metoprolol Tartrate	Metoprolol Tartrate	24	suppressed
Pantoprazole Sodium	Pantoprazole Sodium	23	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	23	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	23	14
Citalopram Hbr	Citalopram Hydrobromide	22	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	22	suppressed
Clopidogrel	Clopidogrel Bisulfate	21	suppressed
Tizanidine Hcl	Tizanidine Hcl	21	suppressed
Trulicity	Dulaglutide	21	suppressed
Alprazolam	Alprazolam	19	suppressed
Ibuprofen	Ibuprofen	19	suppressed
Lovastatin	Lovastatin	19	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	19	suppressed
Xarelto	Rivaroxaban	19	suppressed
Finasteride	Finasteride	18	suppressed
Mirtazapine	Mirtazapine	18	suppressed
Montelukast Sodium	Montelukast Sodium	18	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	18	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	17	suppressed
Cephalexin	Cephalexin	17	15
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	17	suppressed
Ondansetron Hcl	Ondansetron Hcl	17	11
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	17	suppressed
Terazosin Hcl	Terazosin Hcl	17	suppressed
Valacyclovir	Valacyclovir Hcl	17	suppressed
Ezetimibe	Ezetimibe	16	suppressed
Januvia	Sitagliptin Phosphate	16	suppressed
Oxycodone Hcl	Oxycodone Hcl	15	suppressed
Atenolol	Atenolol	14	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	14	suppressed
Methocarbamol	Methocarbamol	14	13
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	14	suppressed
Acetaminophen-Codeine	Acetaminophen With Codeine	12	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	12	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	12	suppressed
Pravastatin Sodium	Pravastatin Sodium	12	suppressed
Propranolol Hcl	Propranolol Hcl	12	suppressed
Rebif	Interferon Beta-1a/Albumin	12	suppressed
Ropinirole Hcl	Ropinirole Hcl	12	suppressed
Spironolactone	Spironolactone	12	suppressed
Doxepin Hcl	Doxepin Hcl	11	suppressed
Hydralazine Hcl	Hydralazine Hcl	11	suppressed
Ketoconazole	Ketoconazole	11	suppressed
Potassium Chloride	Potassium Chloride	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