Healthcare provider profile · identity verified

Vicente Lam Siu, M.D.

Allopathic & Osteopathic Physicians|Internal Medicine · SAN ANGELO, TX · NPI 1497958862

Profile state: payments and partd 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

CMS Open Payments records show Vicente Lam Siu, M.D. received $510.00 in general payments during 2025 across 28 reported records.

Merck Sharp & Dohme LLC accounted for 20.3% of that reported general-payment amount.

The Open Payments records used for this analysis explicitly named 22 associated products.

A separate comparison found the same explicitly named product in public Medicare Part D data: Eliquis, Jardiance, Mounjaro, Ozempic.

AstraZeneca Pharmaceuticals LP reported payments to this doctor in 2025. Across the 2025 Open Payments General Payment records loaded for this analysis, that same reporting entity reported FARXIGA as an associated drug or biological on 106133 records involving 42906 distinct recipient NPIs. Public Medicare Part D data also shows 17 claims for Farxiga by this doctor in 2024.

AstraZeneca Pharmaceuticals LP reported payments to this doctor in 2025. Across the 2025 Open Payments General Payment records loaded for this analysis, that same reporting entity reported SYMBICORT as an associated drug or biological on 71 records involving 51 distinct recipient NPIs. Public Medicare Part D data also shows 24 claims for Symbicort by this doctor in 2024.

Boehringer Ingelheim Pharmaceuticals, Inc. reported payments to this doctor in 2025. Across the 2025 Open Payments General Payment records loaded for this analysis, that same reporting entity reported JARDIANCE as an associated drug or biological on 123636 records involving 49438 distinct recipient NPIs. Public Medicare Part D data also shows 45 claims for Jardiance by this doctor in 2024.

E.R. Squibb & Sons, L.L.C. reported payments to this doctor in 2025. Across the 2025 Open Payments General Payment records loaded for this analysis, that same reporting entity reported ELIQUIS as an associated drug or biological on 27956 records involving 14870 distinct recipient NPIs. Public Medicare Part D data also shows 132 claims for Eliquis by this doctor in 2024.

Lilly USA, LLC reported payments to this doctor in 2025. Across the 2025 Open Payments General Payment records loaded for this analysis, that same reporting entity reported JARDIANCE as an associated drug or biological on 47708 records involving 23833 distinct recipient NPIs. Public Medicare Part D data also shows 45 claims for Jardiance by this doctor in 2024.

Lilly USA, LLC reported payments to this doctor in 2025. Across the 2025 Open Payments General Payment records loaded for this analysis, that same reporting entity reported MOUNJARO as an associated drug or biological on 186719 records involving 66436 distinct recipient NPIs. Public Medicare Part D data also shows 25 claims for Mounjaro by this doctor in 2024.

Lilly USA, LLC reported payments to this doctor in 2025. Across the 2025 Open Payments General Payment records loaded for this analysis, that same reporting entity reported TRULICITY as an associated drug or biological on 71 records involving 57 distinct recipient NPIs. Public Medicare Part D data also shows 24 claims for Trulicity by this doctor in 2024.

Novo Nordisk Inc reported payments to this doctor in 2025. Across the 2025 Open Payments General Payment records loaded for this analysis, that same reporting entity reported Ozempic as an associated drug or biological on 261625 records involving 77793 distinct recipient NPIs. Public Medicare Part D data also shows 150 claims for Ozempic by this doctor in 2024.

PFIZER INC. reported payments to this doctor in 2025. Across the 2025 Open Payments General Payment records loaded for this analysis, that same reporting entity reported ELIQUIS as an associated drug or biological on 87112 records involving 36032 distinct recipient NPIs. Public Medicare Part D data also shows 132 claims for Eliquis by this doctor in 2024.

These records do not establish that a payment influenced prescribing or medical care.

Payment overview · 2025

General Payments

$510.00

28 reported records · 12 companies

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.

Who paid this doctor?

Companies in 2025 General Payments

Reported companyCanonical companyAmountShareRecordsYear
Merck Sharp & Dohme LLC Unresolved — no canonical attribution shown $103.7020.3%52025
PFIZER INC. Unresolved — no canonical attribution shown $89.4317.5%52025
Boehringer Ingelheim Pharmaceuticals, Inc. Unresolved — no canonical attribution shown $67.0513.2%42025
Lilly USA, LLC Unresolved — no canonical attribution shown $54.9510.8%32025
Novo Nordisk Inc Unresolved — no canonical attribution shown $44.178.7%32025
Amgen Inc. Unresolved — no canonical attribution shown $42.468.3%22025
E.R. Squibb & Sons, L.L.C. Unresolved — no canonical attribution shown $21.644.2%12025
Seqirus USA Inc Unresolved — no canonical attribution shown $21.284.2%12025
GlaxoSmithKline, LLC. Unresolved — no canonical attribution shown $19.243.8%12025
Melinta Therapeutics, LLC Unresolved — no canonical attribution shown $17.833.5%12025
AstraZeneca Pharmaceuticals LP Unresolved — no canonical attribution shown $14.782.9%12025
Salix Pharmaceuticals, a division of Bausch Health US, LLC Unresolved — no canonical attribution shown $13.472.6%12025

What were the payments for?

Payment categories

CategoryAmountRecords
Food and Beverage$510.0028

A meal, consulting fee, royalty, and travel payment describe different kinds of reported relationships and should not be interpreted as equivalent.

Analysis 1 · Payment-linked products

Products named in Open Payments records

Reported productTypeReported companyRelated amount*RecordsYear
ABRYSVO
Normalized: abrysvo
Biological PFIZER INC. $89.43 5 2025
Source payment records
COMIRNATY
Normalized: comirnaty
Biological PFIZER INC. $89.43 5 2025
Source payment records
PREVNAR 20
Normalized: prevnar 20
Biological PFIZER INC. $89.43 5 2025
Source payment records
PIFELTRO
Normalized: pifeltro
Drug Merck Sharp & Dohme LLC $73.58 3 2025
Source payment records
JARDIANCE
Normalized: jardiance
Drug Boehringer Ingelheim Pharmaceuticals, Inc. $67.05 4 2025
Source payment records
MOUNJARO
Normalized: mounjaro
Drug Lilly USA, LLC $54.95 3 2025
Source payment records
ZEPBOUND
Normalized: zepbound
Drug Lilly USA, LLC $54.95 3 2025
Source payment records
EVENITY
Normalized: evenity
Biological Amgen Inc. $42.46 2 2025
Source payment records
PROLIA
Normalized: prolia
Biological Amgen Inc. $42.46 2 2025
Source payment records
ZERBAXA
Normalized: zerbaxa
Drug Merck Sharp & Dohme LLC $30.12 2 2025
Source payment records
CAPVAXIVE
Normalized: capvaxive
Biological Merck Sharp & Dohme LLC $27.87 1 2025
Source payment records
Ozempic
Normalized: ozempic
Drug Novo Nordisk Inc $27.79 2 2025
Source payment records
Rybelsus
Normalized: rybelsus
Drug Novo Nordisk Inc $27.79 2 2025
Source payment records
ELIQUIS
Normalized: eliquis
Drug E.R. Squibb & Sons, L.L.C. $21.64 1 2025
Source payment records
Fluad
Normalized: fluad
Biological Seqirus USA Inc $21.28 1 2025
Source payment records
Flucelvax
Normalized: flucelvax
Biological Seqirus USA Inc $21.28 1 2025
Source payment records
SHINGRIX
Normalized: shingrix
Biological GlaxoSmithKline, LLC. $19.24 1 2025
Source payment records
Kimyrsa
Normalized: kimyrsa
Drug Melinta Therapeutics, LLC $17.83 1 2025
Source payment records
Rezzayo
Normalized: rezzayo
Drug Melinta Therapeutics, LLC $17.83 1 2025
Source payment records
Wegovy
Normalized: wegovy
Drug Novo Nordisk Inc $16.38 1 2025
Source payment records
BREZTRI
Normalized: breztri
Drug AstraZeneca Pharmaceuticals LP $14.78 1 2025
Source payment records
XIFAXAN
Normalized: xifaxan
Drug Salix Pharmaceuticals, a division of Bausch Health US, LLC $13.47 1 2025
Source payment records
  • 2025-06-03 · Salix Pharmaceuticals, a division of Bausch Health US, LLC · $13.47 · Open Payments source

* Product-associated amounts are non-additive because one payment record may name more than one product.

These products were named on specific Open Payments records. A named product does not show that the payment influenced treatment or prescribing.

Public prescribing for products named in payments

Open Payments productPayment yearPart D brandPart D yearClaimsMatch methodSource
ELIQUIS
eliquis
2025 Eliquis 2024 132 exact normalized Medicare Part D
JARDIANCE
jardiance
2025 Jardiance 2024 45 exact normalized Medicare Part D
MOUNJARO
mounjaro
2025 Mounjaro 2024 25
Beneficiary count suppressed
exact normalized Medicare Part D
Ozempic
ozempic
2025 Ozempic 2024 150 exact normalized Medicare Part D

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.

Paying companyPayment yearDrug reported by same entityOpen Payments evidencePart DClaimsBeneficiaries
AstraZeneca Pharmaceuticals LP
Exact reporting entity; no affiliate inference
2025 FARXIGA
open payments reported associated product
CMS Open Payments — General Payments
106133 supporting records · 42906 recipient NPIs · example record 1206131362
Farxiga · 2024
Exact normalized brand match · 1 Part D row
17 suppressed by CMS
AstraZeneca Pharmaceuticals LP
Exact reporting entity; no affiliate inference
2025 SYMBICORT
open payments reported associated product
CMS Open Payments — General Payments
71 supporting records · 51 recipient NPIs · example record 1206132610
Symbicort · 2024
Exact normalized brand match · 1 Part D row
24 suppressed by CMS
Boehringer Ingelheim Pharmaceuticals, Inc.
Exact reporting entity; no affiliate inference
2025 JARDIANCE
open payments reported associated product
CMS Open Payments — General Payments
123636 supporting records · 49438 recipient NPIs · example record 1221811583
Jardiance · 2024
Exact normalized brand match · 1 Part D row
45 13
E.R. Squibb & Sons, L.L.C.
Exact reporting entity; no affiliate inference
2025 ELIQUIS
open payments reported associated product
CMS Open Payments — General Payments
27956 supporting records · 14870 recipient NPIs · example record 1184377713
Eliquis · 2024
Exact normalized brand match · 1 Part D row
132 38
Lilly USA, LLC
Exact reporting entity; no affiliate inference
2025 JARDIANCE
open payments reported associated product
CMS Open Payments — General Payments
47708 supporting records · 23833 recipient NPIs · example record 1186464557
Jardiance · 2024
Exact normalized brand match · 1 Part D row
45 13
Lilly USA, LLC
Exact reporting entity; no affiliate inference
2025 MOUNJARO
open payments reported associated product
CMS Open Payments — General Payments
186719 supporting records · 66436 recipient NPIs · example record 1186464455
Mounjaro · 2024
Exact normalized brand match · 1 Part D row
25 suppressed by CMS
Lilly USA, LLC
Exact reporting entity; no affiliate inference
2025 TRULICITY
open payments reported associated product
CMS Open Payments — General Payments
71 supporting records · 57 recipient NPIs · example record 1186464601
Trulicity · 2024
Exact normalized brand match · 1 Part D row
24 suppressed by CMS
Novo Nordisk Inc
Exact reporting entity; no affiliate inference
2025 Ozempic
open payments reported associated product
CMS Open Payments — General Payments
261625 supporting records · 77793 recipient NPIs · example record 1188130076
Ozempic · 2024
Exact normalized brand match · 1 Part D row
150 29
PFIZER INC.
Exact reporting entity; no affiliate inference
2025 ELIQUIS
open payments reported associated product
CMS Open Payments — General Payments
87112 supporting records · 36032 recipient NPIs · example record 1228794063
Eliquis · 2024
Exact normalized brand match · 1 Part D row
132 38

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

BrandGenericClaimsBeneficiaries
Atorvastatin CalciumAtorvastatin Calcium694205
Levothyroxine SodiumLevothyroxine Sodium635169
GabapentinGabapentin457136
FurosemideFurosemide390116
Metformin HclMetformin Hcl36199
LisinoprilLisinopril348103
Losartan PotassiumLosartan Potassium339101
Amlodipine BesylateAmlodipine Besylate29883
OmeprazoleOmeprazole22161
Sertraline HclSertraline Hcl22167
Potassium ChloridePotassium Chloride21164
Pantoprazole SodiumPantoprazole Sodium20463
Buspirone HclBuspirone Hcl19546
Trazodone HclTrazodone Hcl19458
Tizanidine HclTizanidine Hcl19173
Metoprolol SuccinateMetoprolol Succinate19060
Rosuvastatin CalciumRosuvastatin Calcium18849
Duloxetine HclDuloxetine Hcl18347
Albuterol Sulfate HfaAlbuterol Sulfate17756
CarvedilolCarvedilol17557
Montelukast SodiumMontelukast Sodium17238
SimvastatinSimvastatin15143
OzempicSemaglutide15029
EliquisApixaban13238
Nifedipine ErNifedipine12029
Tamsulosin HclTamsulosin Hcl11840
AllopurinolAllopurinol11433
Fluticasone PropionateFluticasone Propionate11237
Metoprolol TartrateMetoprolol Tartrate11036
Zolpidem TartrateZolpidem Tartrate10612
HydrochlorothiazideHydrochlorothiazide10532
GlipizideGlipizide10334
Amoxicillin-Clavulanate PotassAmoxicillin/Potassium Clav10081
ClopidogrelClopidogrel Bisulfate9938
Cyclobenzaprine HclCyclobenzaprine Hcl9826
Alendronate SodiumAlendronate Sodium8927
Hydralazine HclHydralazine Hcl8121
GlimepirideGlimepiride8023
Lisinopril-HydrochlorothiazideLisinopril/Hydrochlorothiazide7921
FamotidineFamotidine7829
Pravastatin SodiumPravastatin Sodium7820
AtenololAtenolol7519
EzetimibeEzetimibe7526
MeloxicamMeloxicam7323
Citalopram HbrCitalopram Hydrobromide7216
SpironolactoneSpironolactone7025
Donepezil HclDonepezil Hcl6921
Amitriptyline HclAmitriptyline Hcl6821
Escitalopram OxalateEscitalopram Oxalate6816
Oxybutynin Chloride ErOxybutynin Chloride6616
AzithromycinAzithromycin6137
Losartan-HydrochlorothiazideLosartan/Hydrochlorothiazide6117
Tramadol HclTramadol Hcl5614
Glipizide ErGlipizide54suppressed
Hydrocodone-AcetaminophenHydrocodone/Acetaminophen5423
Quetiapine FumarateQuetiapine Fumarate5316
Memantine HclMemantine Hcl5215
AlprazolamAlprazolam51suppressed
Bupropion XlBupropion Hcl5115
MirtazapineMirtazapine5114
Ropinirole HclRopinirole Hcl5011
Fluoxetine HclFluoxetine Hcl4912
Olmesartan MedoxomilOlmesartan Medoxomil4912
FinasterideFinasteride4817
CefdinirCefdinir4639
JanuviaSitagliptin Phosphate4611
JardianceEmpagliflozin4513
Lantus SolostarInsulin Glargine,hum.Rec.Anlog4418
CelecoxibCelecoxib3813
AripiprazoleAripiprazole3612
SynthroidLevothyroxine Sodium35suppressed
Venlafaxine Hcl ErVenlafaxine Hcl35suppressed
Triamterene-HydrochlorothiazidTriamterene/Hydrochlorothiazid34suppressed
Metformin Hcl ErMetformin Hcl32suppressed
MyrbetriqMirabegron32suppressed
Warfarin SodiumWarfarin Sodium32suppressed
Pramipexole DihydrochloridePramipexole Di-Hcl3111
Ventolin HfaAlbuterol Sulfate3111
Esomeprazole MagnesiumEsomeprazole Magnesium3011
LevofloxacinLevofloxacin3025
Isosorbide Mononitrate ErIsosorbide Mononitrate2914
ColchicineColchicine26suppressed
EstradiolEstradiol2611
Hydroxyzine HclHydroxyzine Hcl2611
LevetiracetamLevetiracetam26suppressed
Diclofenac SodiumDiclofenac Sodium25suppressed
Levocetirizine DihydrochlorideLevocetirizine Dihydrochloride25suppressed
MethocarbamolMethocarbamol2514
MounjaroTirzepatide25suppressed
Ondansetron OdtOndansetron2517
Breo ElliptaFluticasone/Vilanterol24suppressed
Doxazosin MesylateDoxazosin Mesylate24suppressed
GlyburideGlyburide24suppressed
NystatinNystatin24suppressed
SymbicortBudesonide/Formoterol Fumarate24suppressed
TrulicityDulaglutide24suppressed
PrednisonePrednisone2312
Tresiba Flextouch U-100Insulin Degludec23suppressed
Clonidine HclClonidine Hcl21suppressed
Diltiazem 24hr Er (Cd)Diltiazem Hcl21suppressed
LactuloseLactulose2111
MethylprednisoloneMethylprednisolone2121
TradjentaLinagliptin21suppressed
Combivent RespimatIpratropium/Albuterol Sulfate20suppressed
Paroxetine HclParoxetine Hcl20suppressed
IrbesartanIrbesartan19suppressed
LovastatinLovastatin19suppressed
NitroglycerinNitroglycerin1917
Ondansetron HclOndansetron Hcl1911
RizatriptanRizatriptan Benzoate19suppressed
Amiodarone HclAmiodarone Hcl18suppressed
Bydureon BciseExenatide Microspheres18suppressed
Toujeo SolostarInsulin Glargine,hum.Rec.Anlog18suppressed
ValacyclovirValacyclovir Hcl1811
FarxigaDapagliflozin Propanediol17suppressed
FenofibrateFenofibrate Nanocrystallized17suppressed
FluconazoleFluconazole17suppressed
LinzessLinaclotide17suppressed
NaproxenNaproxen17suppressed
Propranolol HclPropranolol Hcl17suppressed
Azelastine HclAzelastine Hcl16suppressed
Benztropine MesylateBenztropine Mesylate16suppressed
Breztri AerosphereBudesonide/Glycopyr/Formoterol16suppressed
CiclopiroxCiclopirox16suppressed
Clotrimazole-BetamethasoneClotrimazole/Betamethasone Dip1612
Dexlansoprazole DrDexlansoprazole16suppressed
Doxepin HclDoxepin Hcl16suppressed
Hydroxyzine PamoateHydroxyzine Pamoate16suppressed
Megestrol AcetateMegestrol Acetate16suppressed
Ziprasidone HclZiprasidone Hcl16suppressed
Ciprofloxacin HclCiprofloxacin Hcl1514
LoperamideLoperamide Hcl15suppressed
MupirocinMupirocin1513
XareltoRivaroxaban15suppressed
Acetaminophen-CodeineAcetaminophen With Codeine14suppressed
AcetazolamideAcetazolamide14suppressed
Dicyclomine HclDicyclomine Hcl14suppressed
LantusInsulin Glargine,hum.Rec.Anlog14suppressed
Meclizine HclMeclizine Hcl14suppressed
RivastigmineRivastigmine14suppressed
Ultra-Fine Short Pen NeedlePen Needle, Diabetic14suppressed
Verapamil ErVerapamil Hcl14suppressed
Wixela InhubFluticasone Propion/Salmeterol14suppressed
CalcitriolCalcitriol13suppressed
CarbamazepineCarbamazepine13suppressed
GemfibrozilGemfibrozil13suppressed
LatanoprostLatanoprost13suppressed
Terazosin HclTerazosin Hcl13suppressed
Vilazodone HclVilazodone Hcl13suppressed
Amlodipine Besylate-BenazeprilAmlodipine Besylate/Benazepril12suppressed
Diltiazem HclDiltiazem Hcl12suppressed
Restasis MultidoseCyclosporine12suppressed
TemazepamTemazepam12suppressed
ConstuloseLactulose11suppressed
Enalapril MaleateEnalapril Maleate11suppressed
Incruse ElliptaUmeclidinium Bromide11suppressed
Klor-Con M20Potassium Chloride11suppressed
Nitrofurantoin Mono-MacroNitrofurantoin Monohyd/M-Cryst11suppressed
Olmesartan-HydrochlorothiazideOlmesartan/Hydrochlorothiazide11suppressed
Solifenacin SuccinateSolifenacin Succinate11suppressed
Tolterodine Tartrate ErTolterodine Tartrate11suppressed

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.

YearGeneral PaymentsMain payerExplicit productsCompany overlapsPart D coverage
2025 $510.00 · 28 records Merck Sharp & Dohme LLC ABRYSVO, BREZTRI, CAPVAXIVE, COMIRNATY, ELIQUIS, EVENITY, Fluad, Flucelvax, JARDIANCE, Kimyrsa, MOUNJARO, Ozempic, PIFELTRO, PREVNAR 20, PROLIA, Rezzayo, Rybelsus, SHINGRIX, Wegovy, XIFAXAN, ZEPBOUND, ZERBAXA 9
2024 Complete

Questions to ask

Questions you could discuss with your doctor

These are general questions generated from reviewed templates. They are not personalized medical advice.

Sources and limitations

How to read this page

Loaded source releases

DatasetYearPublicationSource
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