Healthcare provider profile · identity verified

Mark Andrew Walshauser, M.D.

Allopathic & Osteopathic Physicians|Internal Medicine|Hematology & Oncology · O FALLON, IL · NPI 1306020664

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 Mark Andrew Walshauser, M.D. received $2,101.05 in general payments during 2025 across 81 reported records.

Exelixis Inc. accounted for 9.7% of that reported general-payment amount.

The Open Payments records used for this analysis explicitly named 51 associated products.

A separate comparison found the same explicitly named product in public Medicare Part D data: Cabometyx.

ABBVIE 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 VENCLEXTA as an associated drug or biological on 10417 records involving 4944 distinct recipient NPIs. Public Medicare Part D data also shows 14 claims for Venclexta by this doctor in 2024.

ARRAY BIOPHARMA 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 IBRANCE as an associated drug or biological on 54 records involving 52 distinct recipient NPIs. Public Medicare Part D data also shows 50 claims for Ibrance 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 CALQUENCE as an associated drug or biological on 8404 records involving 3935 distinct recipient NPIs. Public Medicare Part D data also shows 13 claims for Calquence 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 TAGRISSO as an associated drug or biological on 5285 records involving 2776 distinct recipient NPIs. Public Medicare Part D data also shows 11 claims for Tagrisso by this doctor in 2024.

Celgene Corporation 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 25 records involving 24 distinct recipient NPIs. Public Medicare Part D data also shows 39 claims for Eliquis by this doctor in 2024.

Celgene Corporation reported payments to this doctor in 2025. Across the 2025 Open Payments General Payment records loaded for this analysis, that same reporting entity reported POMALYST as an associated drug or biological on 282 records involving 237 distinct recipient NPIs. Public Medicare Part D data also shows 33 claims for Pomalyst 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 39 claims for Eliquis by this doctor in 2024.

Exelixis 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 CABOMETYX as an associated drug or biological on 11749 records involving 4526 distinct recipient NPIs. Public Medicare Part D data also shows 12 claims for Cabometyx by this doctor in 2024.

Genentech USA, 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 Venclexta as an associated drug or biological on 2896 records involving 2018 distinct recipient NPIs. Public Medicare Part D data also shows 14 claims for Venclexta by this doctor in 2024.

Janssen Biotech, 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 XARELTO as an associated drug or biological on 24 records involving 23 distinct recipient NPIs. Public Medicare Part D data also shows 33 claims for Xarelto 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 39 claims for Eliquis 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 IBRANCE as an associated drug or biological on 11505 records involving 4934 distinct recipient NPIs. Public Medicare Part D data also shows 50 claims for Ibrance by this doctor in 2024.

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

Payment overview · 2025

General Payments

$2,101.05

81 reported records · 32 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
Exelixis Inc. Unresolved — no canonical attribution shown $204.159.7%22025
Cardinal Health 108 LLC Unresolved — no canonical attribution shown $191.349.1%22025
Janssen Biotech, Inc. Unresolved — no canonical attribution shown $150.067.1%102025
PFIZER INC. Unresolved — no canonical attribution shown $145.356.9%62025
Aveo Pharmaceuticals, Inc. Unresolved — no canonical attribution shown $135.836.5%22025
Novartis Pharmaceuticals Corporation Unresolved — no canonical attribution shown $120.205.7%52025
SEAGEN INC. Unresolved — no canonical attribution shown $99.954.8%12025
E.R. Squibb & Sons, L.L.C. Unresolved — no canonical attribution shown $99.934.8%42025
ABBVIE INC. Unresolved — no canonical attribution shown $80.613.8%42025
AstraZeneca Pharmaceuticals LP Unresolved — no canonical attribution shown $80.403.8%42025
Gilead Sciences, Inc. Unresolved — no canonical attribution shown $61.842.9%32025
ARRAY BIOPHARMA INC Unresolved — no canonical attribution shown $61.402.9%52025
Merck Sharp & Dohme LLC Unresolved — no canonical attribution shown $60.462.9%32025
Celgene Corporation Unresolved — no canonical attribution shown $56.892.7%32025
EMD Serono, Inc. Unresolved — no canonical attribution shown $56.712.7%22025
Incyte Corporation Unresolved — no canonical attribution shown $56.622.7%32025
GENZYME CORPORATION Unresolved — no canonical attribution shown $54.242.6%32025
Astellas Pharma US Inc Unresolved — no canonical attribution shown $45.272.1%22025
Genentech USA, Inc. Unresolved — no canonical attribution shown $40.061.9%22025
Takeda Pharmaceuticals U.S.A., Inc. Unresolved — no canonical attribution shown $38.441.8%22025
KYOWA KIRIN, INC. Unresolved — no canonical attribution shown $34.231.6%22025
Alexion Pharmaceuticals, Inc. Unresolved — no canonical attribution shown $25.731.2%12025
Deciphera Pharmaceuticals Inc. Unresolved — no canonical attribution shown $24.751.2%12025
GlaxoSmithKline, LLC. Unresolved — no canonical attribution shown $23.581.1%12025
TerSera Therapeutics LLC Unresolved — no canonical attribution shown $21.971.1%12025
Boehringer Ingelheim Pharmaceuticals, Inc. Unresolved — no canonical attribution shown $21.081.0%12025
Adaptive Biotechnologies Corporation Unresolved — no canonical attribution shown $20.331.0%12025
SERVIER PHARMACEUTICALS LLC Unresolved — no canonical attribution shown $19.700.9%12025
Corcept Therapeutics Unresolved — no canonical attribution shown $19.650.9%12025
Spectrum Pharmaceuticals Inc. Unresolved — no canonical attribution shown $19.400.9%12025
Bayer Healthcare Pharmaceuticals Inc. Unresolved — no canonical attribution shown $16.810.8%12025
Novocure Inc. Unresolved — no canonical attribution shown $14.070.7%12025

What were the payments for?

Payment categories

CategoryAmountRecords
Food and Beverage$2,001.1080
Education$99.951

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
CABOMETYX
Normalized: cabometyx
Drug Exelixis Inc. $204.15 2 2025
Source payment records
FOTIVDA
Normalized: fotivda
Drug Aveo Pharmaceuticals, Inc. $135.83 2 2025
Source payment records
RYBREVANT
Normalized: rybrevant
Drug Janssen Biotech, Inc. $100.68 8 2025
Source payment records
ELREXFIO
Normalized: elrexfio
Drug PFIZER INC. $78.79 3 2025
Source payment records
OPDIVO
Normalized: opdivo
Biological E.R. Squibb & Sons, L.L.C. $75.32 3 2025
Source payment records
Trodelvy
Normalized: trodelvy
Drug Gilead Sciences, Inc. $61.84 3 2025
Source payment records
BRAFTOVI
Normalized: braftovi
Drug ARRAY BIOPHARMA INC $61.40 5 2025
Source payment records
MEKTOVI
Normalized: mektovi
Drug ARRAY BIOPHARMA INC $61.40 5 2025
Source payment records
KEYTRUDA
Normalized: keytruda
Biological Merck Sharp & Dohme LLC $60.46 3 2025
Source payment records
EPKINLY
Normalized: epkinly
Drug ABBVIE INC. $57.39 3 2025
Source payment records
IMBRUVICA
Normalized: imbruvica
Drug ABBVIE INC. $57.39 3 2025
Source payment records
SCEMBLIX
Normalized: scemblix
Drug Novartis Pharmaceuticals Corporation $57.10 2 2025
Source payment records
REBLOZYL
Normalized: reblozyl
Biological Celgene Corporation $56.89 3 2025
Source payment records
LYNPARZA
Normalized: lynparza
Biological, Drug AstraZeneca Pharmaceuticals LP, Merck Sharp & Dohme LLC $51.08 2 2025
Source payment records
DARZALEX
Normalized: darzalex
Biological Janssen Biotech, Inc. $49.38 2 2025
Source payment records
TALVEY
Normalized: talvey
Biological Janssen Biotech, Inc. $49.38 2 2025
Source payment records
LORBRENA
Normalized: lorbrena
Drug ARRAY BIOPHARMA INC $49.32 3 2025
Source payment records
Vyloy
Normalized: vyloy
Drug Astellas Pharma US Inc $45.27 2 2025
Source payment records
KISQALI
Normalized: kisqali
Drug Novartis Pharmaceuticals Corporation $41.66 2 2025
Source payment records
Polivy
Normalized: polivy
Biological Genentech USA, Inc. $40.06 2 2025
Source payment records
JAKAFI
Normalized: jakafi
Drug Incyte Corporation $39.59 2 2025
Source payment records
ICLUSIG
Normalized: iclusig
Drug Takeda Pharmaceuticals U.S.A., Inc. $38.44 2 2025
Source payment records
XALKORI
Normalized: xalkori
Drug ARRAY BIOPHARMA INC $37.19 2 2025
Source payment records
POTELIGEO
Normalized: poteligeo
Drug KYOWA KIRIN, INC. $34.23 2 2025
Source payment records
BENEFIX
Normalized: benefix
Biological PFIZER INC. $33.98 1 2025
Source payment records
HYMPAVZI
Normalized: hympavzi
Drug PFIZER INC. $33.98 1 2025
Source payment records
XYNTHA
Normalized: xyntha
Biological PFIZER INC. $33.98 1 2025
Source payment records
SARCLISA
Normalized: sarclisa
Biological GENZYME CORPORATION $32.87 2 2025
Source payment records
PADCEV
Normalized: padcev
Biological PFIZER INC. $32.58 2 2025
Source payment records
KEYTRUDA QLEX
Normalized: keytruda qlex
Biological Merck Sharp & Dohme LLC $29.22 1 2025
Source payment records
TECVAYLI
Normalized: tecvayli
Biological Janssen Biotech, Inc. $26.43 1 2025
Source payment records
ULTOMIRIS
Normalized: ultomiris
Biological Alexion Pharmaceuticals, Inc. $25.73 1 2025
Source payment records
ENHERTU
Normalized: enhertu
Biological AstraZeneca Pharmaceuticals LP $25.35 1 2025
Source payment records
QINLOCK
Normalized: qinlock
Drug Deciphera Pharmaceuticals Inc. $24.75 1 2025
Source payment records
OPDUALAG
Normalized: opdualag
Drug E.R. Squibb & Sons, L.L.C. $24.61 1 2025
Source payment records
OJJAARA
Normalized: ojjaara
Drug GlaxoSmithKline, LLC. $23.58 1 2025
Source payment records
EMRELIS
Normalized: emrelis
Drug ABBVIE INC. $23.22 1 2025
Source payment records
Zoladex
Normalized: zoladex
Drug TerSera Therapeutics LLC $21.97 1 2025
Source payment records
PLUVICTO
Normalized: pluvicto
Drug Novartis Pharmaceuticals Corporation $21.44 1 2025
Source payment records
AYVAKIT
Normalized: ayvakit
Biological GENZYME CORPORATION $21.37 1 2025
Source payment records
clonoSEQ
Normalized: clonoseq
Device Adaptive Biotechnologies Corporation $20.33 1 2025
Source payment records
Tibsovo
Normalized: tibsovo
Drug SERVIER PHARMACEUTICALS LLC $19.70 1 2025
Source payment records
Korlym
Normalized: korlym
Drug Corcept Therapeutics $19.65 1 2025
Source payment records
ROLVEDON
Normalized: rolvedon
Drug Spectrum Pharmaceuticals Inc. $19.40 1 2025
Source payment records
MONJUVI
Normalized: monjuvi
Drug Incyte Corporation $17.03 1 2025
Source payment records
ZYNYZ
Normalized: zynyz
Drug Incyte Corporation $17.03 1 2025
Source payment records
ADCETRIS
Normalized: adcetris
Biological PFIZER INC. $16.95 1 2025
Source payment records
Nubeqa
Normalized: nubeqa
Drug Bayer Healthcare Pharmaceuticals Inc. $16.81 1 2025
Source payment records
IMFINZI
Normalized: imfinzi
Biological AstraZeneca Pharmaceuticals LP $14.97 1 2025
Source payment records
Optune Lua (NovoTTF-200T)
Normalized: optune lua novottf 200t
Device Novocure Inc. $14.07 1 2025
Source payment records
TUKYSA
Normalized: tukysa
Drug ARRAY BIOPHARMA INC $12.08 2 2025
Source payment records

* 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
CABOMETYX
cabometyx
2025 Cabometyx 2024 12
Beneficiary count suppressed
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
ABBVIE INC.
Exact reporting entity; no affiliate inference
2025 VENCLEXTA
open payments reported associated product
CMS Open Payments — General Payments
10417 supporting records · 4944 recipient NPIs · example record 1201353144
Venclexta · 2024
Exact normalized brand match · 1 Part D row
14 suppressed by CMS
ARRAY BIOPHARMA INC
Exact reporting entity; no affiliate inference
2025 IBRANCE
open payments reported associated product
CMS Open Payments — General Payments
54 supporting records · 52 recipient NPIs · example record 1228804288
Ibrance · 2024
Exact normalized brand match · 1 Part D row
50 suppressed by CMS
AstraZeneca Pharmaceuticals LP
Exact reporting entity; no affiliate inference
2025 CALQUENCE
open payments reported associated product
CMS Open Payments — General Payments
8404 supporting records · 3935 recipient NPIs · example record 1206131382
Calquence · 2024
Exact normalized brand match · 1 Part D row
13 suppressed by CMS
AstraZeneca Pharmaceuticals LP
Exact reporting entity; no affiliate inference
2025 TAGRISSO
open payments reported associated product
CMS Open Payments — General Payments
5285 supporting records · 2776 recipient NPIs · example record 1206131546
Tagrisso · 2024
Exact normalized brand match · 1 Part D row
11 suppressed by CMS
Celgene Corporation
Exact reporting entity; no affiliate inference
2025 ELIQUIS
open payments reported associated product
CMS Open Payments — General Payments
25 supporting records · 24 recipient NPIs · example record 1184385048
Eliquis · 2024
Exact normalized brand match · 1 Part D row
39 12
Celgene Corporation
Exact reporting entity; no affiliate inference
2025 POMALYST
open payments reported associated product
CMS Open Payments — General Payments
282 supporting records · 237 recipient NPIs · example record 1184378437
Pomalyst · 2024
Exact normalized brand match · 1 Part D row
33 suppressed by CMS
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
39 12
Exelixis Inc.
Exact reporting entity; no affiliate inference
2025 CABOMETYX
open payments reported associated product
CMS Open Payments — General Payments
11749 supporting records · 4526 recipient NPIs · example record 1218789893
Cabometyx · 2024
Exact normalized brand match · 1 Part D row
12 suppressed by CMS
Genentech USA, Inc.
Exact reporting entity; no affiliate inference
2025 Venclexta
open payments reported associated product
CMS Open Payments — General Payments
2896 supporting records · 2018 recipient NPIs · example record 1211488584
Venclexta · 2024
Exact normalized brand match · 1 Part D row
14 suppressed by CMS
Janssen Biotech, Inc.
Exact reporting entity; no affiliate inference
2025 XARELTO
open payments reported associated product
CMS Open Payments — General Payments
24 supporting records · 23 recipient NPIs · example record 1174259978
Xarelto · 2024
Exact normalized brand match · 1 Part D row
33 suppressed by CMS
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
39 12
PFIZER INC.
Exact reporting entity; no affiliate inference
2025 IBRANCE
open payments reported associated product
CMS Open Payments — General Payments
11505 supporting records · 4934 recipient NPIs · example record 1228794164
Ibrance · 2024
Exact normalized brand match · 1 Part D row
50 suppressed by CMS

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
AnastrozoleAnastrozole12947
Ondansetron HclOndansetron Hcl10880
Prochlorperazine MaleateProchlorperazine Maleate9478
PrednisonePrednisone8929
Hydrocodone-AcetaminophenHydrocodone/Acetaminophen6721
IbrancePalbociclib50suppressed
DexamethasoneDexamethasone4620
Tramadol HclTramadol Hcl4615
HydroxyureaHydroxyurea4415
Folic AcidFolic Acid4018
EliquisApixaban3912
Abiraterone AcetateAbiraterone Acetate33suppressed
AcyclovirAcyclovir3311
PomalystPomalidomide33suppressed
XareltoRivaroxaban33suppressed
Potassium ChloridePotassium Chloride3116
Morphine Sulfate ErMorphine Sulfate27suppressed
Levothyroxine SodiumLevothyroxine Sodium25suppressed
Oxycodone HclOxycodone Hcl22suppressed
HydrocortisoneHydrocortisone21suppressed
OlanzapineOlanzapine21suppressed
RevlimidLenalidomide21suppressed
FurosemideFurosemide2011
LenalidomideLenalidomide20suppressed
LevofloxacinLevofloxacin19suppressed
Oxycodone-AcetaminophenOxycodone Hcl/Acetaminophen17suppressed
Colesevelam HclColesevelam Hcl16suppressed
Klor-Con M20Potassium Chloride16suppressed
Alendronate SodiumAlendronate Sodium15suppressed
Tamoxifen CitrateTamoxifen Citrate15suppressed
VenclextaVenetoclax14suppressed
CalquenceAcalabrutinib Maleate13suppressed
CyclosporineCyclosporine13suppressed
CabometyxCabozantinib S-Malate12suppressed
FluconazoleFluconazole12suppressed
InrebicFedratinib Dihydrochloride12suppressed
AllopurinolAllopurinol11suppressed
TagrissoOsimertinib Mesylate11suppressed

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 $2,101.05 · 81 records Exelixis Inc. ADCETRIS, AYVAKIT, BENEFIX, BRAFTOVI, CABOMETYX, DARZALEX, ELREXFIO, EMRELIS, ENHERTU, EPKINLY, FOTIVDA, HYMPAVZI, ICLUSIG, IMBRUVICA, IMFINZI, JAKAFI, KEYTRUDA, KEYTRUDA QLEX, KISQALI, Korlym, LORBRENA, LYNPARZA, MEKTOVI, MONJUVI, Nubeqa, OJJAARA, OPDIVO, OPDUALAG, Optune Lua (NovoTTF-200T), PADCEV, PLUVICTO, POTELIGEO, Polivy, QINLOCK, REBLOZYL, ROLVEDON, RYBREVANT, SARCLISA, SCEMBLIX, TALVEY, TECVAYLI, TUKYSA, Tibsovo, Trodelvy, ULTOMIRIS, Vyloy, XALKORI, XYNTHA, ZYNYZ, Zoladex, clonoSEQ 12
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