Healthcare provider profile · identity verified

Daniel Tamashiro, M.D.

Internal Medicine · CLACKAMAS, OR · NPI 1720191596

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
Losartan Potassium	Losartan Potassium	752	222
Atorvastatin Calcium	Atorvastatin Calcium	707	208
Simvastatin	Simvastatin	634	168
Amlodipine Besylate	Amlodipine Besylate	627	184
Oxycodone Hcl	Oxycodone Hcl	471	72
Levothyroxine Sodium	Levothyroxine Sodium	418	105
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	343	65
Lisinopril	Lisinopril	340	102
Tamsulosin Hcl	Tamsulosin Hcl	332	104
Pantoprazole Sodium	Pantoprazole Sodium	328	124
Metoprolol Tartrate	Metoprolol Tartrate	325	102
Trazodone Hcl	Trazodone Hcl	302	87
Glipizide	Glipizide	296	85
Gabapentin	Gabapentin	289	88
Albuterol Sulfate Hfa	Albuterol Sulfate	287	93
Metformin Hcl	Metformin Hcl	274	79
Potassium Chloride	Potassium Chloride	271	84
Metoprolol Succinate	Metoprolol Succinate	252	74
Pradaxa	Dabigatran Etexilate Mesylate	230	70
Furosemide	Furosemide	202	67
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	198	23
Pravastatin Sodium	Pravastatin Sodium	193	54
Atenolol	Atenolol	191	56
Hydrochlorothiazide	Hydrochlorothiazide	187	62
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	170	45
Rosuvastatin Calcium	Rosuvastatin Calcium	166	50
Metformin Hcl Er	Metformin Hcl	154	53
Buspirone Hcl	Buspirone Hcl	143	29
Sertraline Hcl	Sertraline Hcl	143	40
Allopurinol	Allopurinol	136	39
Warfarin Sodium	Warfarin Sodium	136	35
Fluoxetine Hcl	Fluoxetine Hcl	126	42
Jardiance	Empagliflozin	123	39
Meloxicam	Meloxicam	117	45
Fluticasone Propionate	Fluticasone Propionate	107	29
Duloxetine Hcl	Duloxetine Hcl	106	31
Clopidogrel	Clopidogrel Bisulfate	105	33
Morphine Sulfate Er	Morphine Sulfate	104	13
Humulin N	Insulin Nph Human Isophane	103	37
Terazosin Hcl	Terazosin Hcl	103	32
Lorazepam	Lorazepam	101	23
Omeprazole	Omeprazole	100	29
Alendronate Sodium	Alendronate Sodium	92	35
Veo Insulin Syringe	Syringe-Needle,insulin,0.5 Ml	92	25
Finasteride	Finasteride	91	27
Pregabalin	Pregabalin	91	27
Torsemide	Torsemide	87	30
Prednisone	Prednisone	85	50
Spironolactone	Spironolactone	85	35
Tramadol Hcl	Tramadol Hcl	82	16
Wixela Inhub	Fluticasone Propion/Salmeterol	81	27
Carvedilol	Carvedilol	77	23
Venlafaxine Hcl Er	Venlafaxine Hcl	76	22
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	74	23
Hydromorphone Hcl	Hydromorphone Hcl	73	12
Ondansetron Odt	Ondansetron	73	22
Spiriva Respimat	Tiotropium Bromide	73	26
Alvesco	Ciclesonide	72	26
Triamcinolone Acetonide	Triamcinolone Acetonide	72	44
Doxycycline Monohydrate	Doxycycline Monohydrate	69	26
Nitroglycerin	Nitroglycerin	66	37
Isosorbide Mononitrate Er	Isosorbide Mononitrate	60	17
Morphine Sulfate	Morphine Sulfate	59	12
Famotidine	Famotidine	56	21
Cephalexin	Cephalexin	55	23
Humulin N Kwikpen	Insulin Nph Human Isophane	55	17
Escitalopram Oxalate	Escitalopram Oxalate	53	11
Hydralazine Hcl	Hydralazine Hcl	51	18
Hydrocortisone	Hydrocortisone	47	23
Eliquis	Apixaban	45	11
Mirtazapine	Mirtazapine	45	suppressed
Breyna	Budesonide/Formoterol Fumarate	43	17
Humulin R	Insulin Regular, Human	43	17
Methocarbamol	Methocarbamol	43	suppressed
Ozempic	Semaglutide	42	suppressed
Propranolol Hcl	Propranolol Hcl	41	12
Clonazepam	Clonazepam	40	suppressed
Ibuprofen	Ibuprofen	39	suppressed
Insulin Glargine-Yfgn	Insulin Glargine-Yfgn	39	16
Bupropion Xl	Bupropion Hcl	37	suppressed
Xarelto	Rivaroxaban	37	suppressed
Acyclovir	Acyclovir	36	12
Donepezil Hcl	Donepezil Hcl	36	13
Ketoconazole	Ketoconazole	36	17
Felodipine Er	Felodipine	35	12
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	35	11
Azelastine Hcl	Azelastine Hcl	32	13
Memantine Hcl	Memantine Hcl	32	suppressed
Lovastatin	Lovastatin	31	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	31	suppressed
Colchicine	Colchicine	30	suppressed
Bupropion Hcl Sr	Bupropion Hcl	29	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	29	suppressed
Buprenorphine-Naloxone	Buprenorphine Hcl/Naloxone Hcl	28	suppressed
Citalopram Hbr	Citalopram Hydrobromide	28	suppressed
Latanoprost	Latanoprost	28	suppressed
Trospium Chloride	Trospium Chloride	28	suppressed
Alprazolam	Alprazolam	27	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	27	suppressed
Methadone Hcl	Methadone Hcl	25	suppressed
Nystatin	Nystatin	25	suppressed
Olanzapine	Olanzapine	25	suppressed
Bupropion Hcl	Bupropion Hcl	24	suppressed
Butalbital-Acetaminophen-Caffe	Butalb/Acetaminophen/Caffeine	24	suppressed
Shingrix	Varicella-Zoster Ge/As01b/Pf	24	24
Fluoridex	Fluoride (Sodium)	23	suppressed
Dextroamphetamine-Amphet Er	Dextroamphetamine/Amphetamine	22	suppressed
Montelukast Sodium	Montelukast Sodium	22	suppressed
Naloxone Hcl	Naloxone Hcl	22	17
Mupirocin	Mupirocin	21	14
Sure Comfort Pen Needle	Pen Needle, Diabetic	21	suppressed
Testosterone Cypionate	Testosterone Cypionate	21	suppressed
Estradiol	Estradiol	20	suppressed
Acetaminophen-Codeine	Acetaminophen With Codeine	19	suppressed
Bisoprolol Fumarate	Bisoprolol Fumarate	19	suppressed
Celecoxib	Celecoxib	19	suppressed
Ultra-Fine Short Pen Needle	Pen Needle, Diabetic	19	suppressed
Valacyclovir	Valacyclovir Hcl	19	suppressed
Verapamil Er	Verapamil Hcl	19	suppressed
Baclofen	Baclofen	18	suppressed
Humalog Kwikpen U-100	Insulin Lispro	18	suppressed
Isosorbide Dinitrate	Isosorbide Dinitrate	18	suppressed
Lidocaine	Lidocaine	18	suppressed
Prochlorperazine Maleate	Prochlorperazine Maleate	18	suppressed
Sucralfate	Sucralfate	18	suppressed
Tenivac	Tetanus-Diphtheria Toxoids/Pf	18	18
Dabigatran Etexilate	Dabigatran Etexilate Mesylate	17	17
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	17	suppressed
Glimepiride	Glimepiride	17	suppressed
Lactulose	Lactulose	17	suppressed
Topiramate	Topiramate	17	suppressed
Amoxicillin	Amoxicillin	16	12
Cefadroxil	Cefadroxil	16	14
Epinephrine	Epinephrine	16	suppressed
Nortriptyline Hcl	Nortriptyline Hcl	16	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	16	suppressed
Prazosin Hcl	Prazosin Hcl	16	suppressed
Promethazine Hcl	Promethazine Hcl	16	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	15	13
Risedronate Sodium	Risedronate Sodium	15	suppressed
Clonidine Hcl	Clonidine Hcl	14	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	14	suppressed
Diphenoxylate-Atropine	Diphenoxylate Hcl/Atropine	14	suppressed
Levetiracetam	Levetiracetam	14	suppressed
Naproxen	Naproxen	14	suppressed
Varenicline Tartrate	Varenicline Tartrate	14	suppressed
Cholestyramine	Cholestyramine (With Sugar)	13	suppressed
Dextroamphetamine-Amphetamine	Dextroamphetamine/Amphetamine	13	suppressed
Doxepin Hcl	Doxepin Hcl	13	suppressed
Ezetimibe	Ezetimibe	13	suppressed
Np Thyroid	Thyroid,pork	13	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	13	suppressed
Ropinirole Hcl	Ropinirole Hcl	13	suppressed
Entresto	Sacubitril/Valsartan	12	suppressed
Lamotrigine	Lamotrigine	12	suppressed
Nifedipine Er	Nifedipine	12	suppressed
Vilazodone Hcl	Vilazodone Hcl	12	suppressed
Azithromycin	Azithromycin	11	suppressed
Chlorthalidone	Chlorthalidone	11	suppressed
Diazepam	Diazepam	11	suppressed
Digoxin	Digoxin	11	suppressed
Diltiazem Hcl	Diltiazem Hcl	11	suppressed
Metronidazole	Metronidazole	11	suppressed
Oxycontin	Oxycodone Hcl	11	suppressed
Propranolol Hcl Er	Propranolol Hcl	11	suppressed
Veo Insulin Syringe	Syringe And Needle,insulin,1ml	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