Healthcare provider profile · identity verified

Patrick A Siaw, M.D.

Internal Medicine · BUFFALO, NY · NPI 1922039213

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
Eliquis	Apixaban	540	53
Levothyroxine Sodium	Levothyroxine Sodium	488	50
Potassium Chloride	Potassium Chloride	469	46
Atorvastatin Calcium	Atorvastatin Calcium	416	57
Pantoprazole Sodium	Pantoprazole Sodium	326	31
Amlodipine Besylate	Amlodipine Besylate	297	38
Furosemide	Furosemide	292	38
Tamsulosin Hcl	Tamsulosin Hcl	243	23
Sertraline Hcl	Sertraline Hcl	210	31
Duloxetine Hcl	Duloxetine Hcl	195	19
Donepezil Hcl	Donepezil Hcl	189	19
Metoprolol Tartrate	Metoprolol Tartrate	184	24
Mirtazapine	Mirtazapine	176	29
Metoprolol Succinate	Metoprolol Succinate	164	28
Prednisone	Prednisone	154	25
Citalopram Hbr	Citalopram Hydrobromide	149	suppressed
Gabapentin	Gabapentin	147	26
Lisinopril	Lisinopril	147	22
Escitalopram Oxalate	Escitalopram Oxalate	143	23
Tramadol Hcl	Tramadol Hcl	139	34
Memantine Hcl	Memantine Hcl	136	29
Rosuvastatin Calcium	Rosuvastatin Calcium	135	13
Haloperidol	Haloperidol	130	suppressed
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	124	29
Trazodone Hcl	Trazodone Hcl	124	24
Atenolol	Atenolol	121	suppressed
Xarelto	Rivaroxaban	116	suppressed
Bumetanide	Bumetanide	113	14
Omeprazole	Omeprazole	111	20
Quetiapine Fumarate	Quetiapine Fumarate	110	15
Myrbetriq	Mirabegron	97	suppressed
Clonazepam	Clonazepam	95	suppressed
Buspirone Hcl	Buspirone Hcl	94	suppressed
Divalproex Sodium	Divalproex Sodium	93	26
Allopurinol	Allopurinol	83	suppressed
Famotidine	Famotidine	82	suppressed
Digoxin	Digoxin	81	suppressed
Jardiance	Empagliflozin	79	11
Levetiracetam	Levetiracetam	78	12
Lorazepam	Lorazepam	78	25
Olanzapine	Olanzapine	77	16
Finasteride	Finasteride	73	suppressed
Pravastatin Sodium	Pravastatin Sodium	71	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	69	suppressed
Warfarin Sodium	Warfarin Sodium	69	suppressed
Nystatin	Nystatin	68	25
Trospium Chloride Er	Trospium Chloride	65	suppressed
Carvedilol	Carvedilol	62	14
Metformin Hcl	Metformin Hcl	62	14
Carbidopa-Levodopa Er	Carbidopa/Levodopa	60	suppressed
Metolazone	Metolazone	60	suppressed
Baclofen	Baclofen	58	suppressed
Carbidopa-Levodopa	Carbidopa/Levodopa	55	suppressed
Doxycycline Hyclate	Doxycycline Hyclate	53	30
Ingrezza	Valbenazine Tosylate	52	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	52	18
Morphine Sulfate	Morphine Sulfate	50	29
Risperidone	Risperidone	49	suppressed
Latanoprost	Latanoprost	48	13
Fluphenazine Hcl	Fluphenazine Hcl	47	suppressed
Ipratropium-Albuterol	Ipratropium/Albuterol Sulfate	46	23
Ceftriaxone	Ceftriaxone Sodium	45	29
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	44	suppressed
Carbamazepine	Carbamazepine	43	suppressed
Folic Acid	Folic Acid	42	suppressed
Gemtesa	Vibegron	42	suppressed
Losartan Potassium	Losartan Potassium	42	suppressed
Paroxetine Hcl	Paroxetine Hcl	41	suppressed
Spironolactone	Spironolactone	41	suppressed
Methadone Hcl	Methadone Hcl	39	suppressed
Nuplazid	Pimavanserin Tartrate	37	suppressed
Oxycodone Hcl	Oxycodone Hcl	35	suppressed
Ezetimibe	Ezetimibe	32	suppressed
Midodrine Hcl	Midodrine Hcl	32	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	31	suppressed
Ondansetron Hcl	Ondansetron Hcl	31	24
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	30	suppressed
Cefpodoxime Proxetil	Cefpodoxime Proxetil	30	23
Colchicine	Colchicine	30	suppressed
Diltiazem Hcl	Diltiazem Hcl	30	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	29	19
Alprazolam	Alprazolam	28	suppressed
Clopidogrel	Clopidogrel Bisulfate	28	suppressed
Lidocaine Hcl	Lidocaine Hcl	28	18
Xiidra	Lifitegrast	28	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	27	15
Arexvy	Rsvpref3 Antigen/As01e/Pf	27	27
Ciprofloxacin Hcl	Ciprofloxacin Hcl	26	17
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	26	suppressed
Lidocaine	Lidocaine	26	suppressed
Entresto	Sacubitril/Valsartan	25	suppressed
Hydralazine Hcl	Hydralazine Hcl	25	suppressed
Autoshield Duo Pen Needle	Pen Needle,dual Safety,diabetc	24	suppressed
Diphenoxylate-Atropine	Diphenoxylate Hcl/Atropine	24	suppressed
Santyl	Collagenase Clostridium Hist.	24	14
Albuterol Sulfate Hfa	Albuterol Sulfate	23	14
Simvastatin	Simvastatin	23	suppressed
Alendronate Sodium	Alendronate Sodium	22	suppressed
Lantus	Insulin Glargine,hum.Rec.Anlog	22	suppressed
Paxlovid	Nirmatrelvir/Ritonavir	22	21
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	22	suppressed
Azithromycin	Azithromycin	19	12
Rexulti	Brexpiprazole	19	suppressed
Tradjenta	Linagliptin	19	suppressed
Fluticasone Propionate	Fluticasone Propionate	18	suppressed
Morphine Sulfate Er	Morphine Sulfate	18	suppressed
Tolterodine Tartrate Er	Tolterodine Tartrate	18	suppressed
Amoxicillin	Amoxicillin	17	12
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	17	suppressed
Methimazole	Methimazole	17	suppressed
Ropinirole Hcl	Ropinirole Hcl	17	suppressed
Cephalexin	Cephalexin	16	suppressed
Cyclosporine	Cyclosporine	16	suppressed
Dorzolamide-Timolol	Dorzolamide/Timolol/Pf	16	suppressed
Lacosamide	Lacosamide	16	suppressed
Levofloxacin	Levofloxacin	16	12
Ozempic	Semaglutide	16	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	16	suppressed
Celecoxib	Celecoxib	15	suppressed
Clozapine	Clozapine	15	suppressed
Memantine Hcl Er	Memantine Hcl	15	suppressed
Amiodarone Hcl	Amiodarone Hcl	14	suppressed
Farxiga	Dapagliflozin Propanediol	14	suppressed
Galantamine Hbr	Galantamine Hbr	14	suppressed
Hydrochlorothiazide	Hydrochlorothiazide	14	suppressed
Isosorbide Dinitrate	Isosorbide Dinitrate	14	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	14	suppressed
Risperdal Consta	Risperidone Microspheres	14	suppressed
Timolol Maleate	Timolol Maleate	14	suppressed
Bupropion Xl	Bupropion Hcl	13	suppressed
Enalapril Maleate	Enalapril Maleate	13	suppressed
Hydromorphone Hcl	Hydromorphone Hcl	13	suppressed
Lamotrigine	Lamotrigine	13	suppressed
Metoclopramide Hcl	Metoclopramide Hcl	13	suppressed
Repatha Syringe	Evolocumab	13	suppressed
Retacrit	Epoetin Alfa-Epbx	13	suppressed
Breo Ellipta	Fluticasone/Vilanterol	12	suppressed
Bromocriptine Mesylate	Bromocriptine Mesylate	12	suppressed
Budesonide-Formoterol Fumarate	Budesonide/Formoterol Fumarate	12	suppressed
Fenofibrate	Fenofibrate Nanocrystallized	12	suppressed
Fluorometholone	Fluorometholone	12	suppressed
Nystatin-Triamcinolone	Nystatin/Triamcinolone Acet	12	suppressed
Telmisartan	Telmisartan	12	suppressed
Aripiprazole	Aripiprazole	11	suppressed
Bisoprolol Fumarate	Bisoprolol Fumarate	11	suppressed
Chlorhexidine Gluconate	Chlorhexidine Gluconate	11	suppressed
Dexlansoprazole Dr	Dexlansoprazole	11	suppressed
Hydrocortisone	Hydrocortisone	11	suppressed
Methotrexate	Methotrexate Sodium	11	suppressed
Spiriva Handihaler	Tiotropium Bromide	11	suppressed
Tizanidine Hcl	Tizanidine Hcl	11	suppressed
Trulicity	Dulaglutide	11	suppressed
Venlafaxine Hcl Er	Venlafaxine 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