Healthcare provider profile · identity verified

Mark Stephen Walmer, MD

Internal Medicine · CHANDLER, AZ · NPI 1629166053

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	760	243
Levothyroxine Sodium	Levothyroxine Sodium	574	172
Lisinopril	Lisinopril	426	132
Pantoprazole Sodium	Pantoprazole Sodium	383	118
Metformin Hcl	Metformin Hcl	339	103
Simvastatin	Simvastatin	271	80
Tamsulosin Hcl	Tamsulosin Hcl	270	81
Amlodipine Besylate	Amlodipine Besylate	265	78
Rosuvastatin Calcium	Rosuvastatin Calcium	252	91
Metoprolol Succinate	Metoprolol Succinate	248	82
Losartan Potassium	Losartan Potassium	219	73
Omeprazole	Omeprazole	216	71
Pioglitazone Hcl	Pioglitazone Hcl	199	60
Meloxicam	Meloxicam	181	61
Sertraline Hcl	Sertraline Hcl	175	50
Allopurinol	Allopurinol	170	51
Gabapentin	Gabapentin	158	49
Celecoxib	Celecoxib	150	43
Potassium Chloride	Potassium Chloride	137	47
Metoprolol Tartrate	Metoprolol Tartrate	129	45
Furosemide	Furosemide	127	45
Glipizide	Glipizide	126	39
Valsartan	Valsartan	126	40
Montelukast Sodium	Montelukast Sodium	120	40
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	118	36
Albuterol Sulfate Hfa	Albuterol Sulfate	116	44
Donepezil Hcl	Donepezil Hcl	109	29
Pravastatin Sodium	Pravastatin Sodium	108	33
Terazosin Hcl	Terazosin Hcl	107	36
Trazodone Hcl	Trazodone Hcl	101	34
Eliquis	Apixaban	100	28
Tramadol Hcl	Tramadol Hcl	94	30
Carvedilol	Carvedilol	92	30
Lorazepam	Lorazepam	88	29
Solifenacin Succinate	Solifenacin Succinate	83	25
Clopidogrel	Clopidogrel Bisulfate	81	29
Fenofibrate	Fenofibrate	81	25
Hydrochlorothiazide	Hydrochlorothiazide	81	31
Pregabalin	Pregabalin	80	26
Citalopram Hbr	Citalopram Hydrobromide	71	21
Fluticasone Propionate	Fluticasone Propionate	71	25
Temazepam	Temazepam	71	18
Atenolol	Atenolol	70	20
Testosterone Cypionate	Testosterone Cypionate	68	27
Warfarin Sodium	Warfarin Sodium	67	22
Propranolol Hcl	Propranolol Hcl	64	18
Bupropion Xl	Bupropion Hcl	61	23
Paroxetine Hcl	Paroxetine Hcl	61	20
Ozempic	Semaglutide	59	15
Alprazolam	Alprazolam	58	21
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	58	22
Spironolactone	Spironolactone	57	18
Duloxetine Hcl	Duloxetine Hcl	56	22
Finasteride	Finasteride	56	20
Jardiance	Empagliflozin	55	16
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	55	suppressed
Ezetimibe	Ezetimibe	53	17
Lovastatin	Lovastatin	53	17
Ciprofloxacin Hcl	Ciprofloxacin Hcl	52	31
Clonazepam	Clonazepam	51	16
Synthroid	Levothyroxine Sodium	51	16
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	48	42
Ondansetron Odt	Ondansetron	48	28
Diclofenac Sodium	Diclofenac Sodium	44	14
Famotidine	Famotidine	44	20
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	44	15
Ibuprofen	Ibuprofen	44	24
Oxycodone Hcl	Oxycodone Hcl	44	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	44	17
Buprenorphine Hcl	Buprenorphine Hcl	43	suppressed
Januvia	Sitagliptin Phosphate	42	11
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	39	14
Irbesartan	Irbesartan	39	13
Doxycycline Hyclate	Doxycycline Hyclate	38	22
Glimepiride	Glimepiride	38	11
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	36	34
Testosterone	Testosterone	36	13
Diazepam	Diazepam	35	12
Tizanidine Hcl	Tizanidine Hcl	35	14
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	35	11
Azithromycin	Azithromycin	34	20
Doxazosin Mesylate	Doxazosin Mesylate	34	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	34	14
Fluoxetine Hcl	Fluoxetine Hcl	33	12
Nifedipine Er	Nifedipine	33	13
Xarelto	Rivaroxaban	33	suppressed
Methylprednisolone	Methylprednisolone	32	23
Metformin Hcl Er	Metformin Hcl	31	suppressed
Prednisone	Prednisone	31	17
Benazepril Hcl	Benazepril Hcl	30	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	30	suppressed
Estradiol	Estradiol	29	13
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	29	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	28	12
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	28	suppressed
Wixela Inhub	Fluticasone Propion/Salmeterol	28	suppressed
Alendronate Sodium	Alendronate Sodium	27	suppressed
Hydrocortisone	Hydrocortisone	27	14
Naproxen	Naproxen	27	12
Clotrimazole-Betamethasone	Clotrimazole/Betamethasone Dip	26	15
Hydroxyzine Pamoate	Hydroxyzine Pamoate	26	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	26	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	25	suppressed
Hydralazine Hcl	Hydralazine Hcl	24	suppressed
Escitalopram Oxalate	Escitalopram Oxalate	23	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	23	suppressed
Labetalol Hcl	Labetalol Hcl	22	suppressed
Ramipril	Ramipril	22	suppressed
Flecainide Acetate	Flecainide Acetate	21	suppressed
Novolog Flexpen	Insulin Aspart	21	suppressed
Valacyclovir	Valacyclovir Hcl	21	16
Amitriptyline Hcl	Amitriptyline Hcl	20	suppressed
Bupropion Hcl Sr	Bupropion Hcl	20	suppressed
Meclizine Hcl	Meclizine Hcl	20	suppressed
Ropinirole Hcl	Ropinirole Hcl	20	suppressed
Mirtazapine	Mirtazapine	19	suppressed
Nystatin	Nystatin	19	suppressed
Chlorthalidone	Chlorthalidone	18	suppressed
Folic Acid	Folic Acid	18	suppressed
Propranolol Hcl Er	Propranolol Hcl	18	suppressed
Eszopiclone	Eszopiclone	17	suppressed
Buprenorphine-Naloxone	Buprenorphine Hcl/Naloxone Hcl	16	suppressed
Farxiga	Dapagliflozin Propanediol	16	suppressed
Fluconazole	Fluconazole	16	suppressed
Spiriva Respimat	Tiotropium Bromide	16	suppressed
Amiodarone Hcl	Amiodarone Hcl	15	suppressed
Clonidine Hcl	Clonidine Hcl	15	suppressed
Olmesartan-Hydrochlorothiazide	Olmesartan/Hydrochlorothiazide	15	suppressed
Acyclovir	Acyclovir	14	suppressed
Calcitonin-Salmon	Calcitonin,salmon,synthetic	14	suppressed
Cephalexin	Cephalexin	14	suppressed
Hydromorphone Hcl	Hydromorphone Hcl	14	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	14	suppressed
Semglee (Yfgn) Pen	Insulin Glargine-Yfgn	14	suppressed
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	14	suppressed
Vitamin D2	Ergocalciferol (Vitamin D2)	14	suppressed
Desvenlafaxine Succinate Er	Desvenlafaxine Succinate	13	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	13	suppressed
Glipizide Er	Glipizide	13	suppressed
Symbicort	Budesonide/Formoterol Fumarate	13	suppressed
Entresto	Sacubitril/Valsartan	12	suppressed
Fenofibrate	Fenofibrate Nanocrystallized	12	suppressed
Fentanyl	Fentanyl	12	suppressed
Gemfibrozil	Gemfibrozil	12	suppressed
Levetiracetam	Levetiracetam	12	suppressed
Methocarbamol	Methocarbamol	12	suppressed
Toujeo Solostar	Insulin Glargine,hum.Rec.Anlog	12	suppressed
Buspirone Hcl	Buspirone Hcl	11	suppressed
Dextroamphetamine Sulfate	Dextroamphetamine Sulfate	11	suppressed
Dilt-Xr	Diltiazem Hcl	11	suppressed
Doxepin Hcl	Doxepin Hcl	11	suppressed
Irbesartan-Hydrochlorothiazide	Irbesartan/Hydrochlorothiazide	11	suppressed
Levemir Flexpen	Insulin Detemir	11	suppressed
Nebivolol Hcl	Nebivolol Hcl	11	suppressed
Nitroglycerin	Nitroglycerin	11	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	11	suppressed
Risperidone	Risperidone	11	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	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