Healthcare provider profile · identity verified

Mark Fesen, MD

Allopathic & Osteopathic Physicians|Internal Medicine|Medical Oncology · GREAT BEND, KS · NPI 1639149545

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 Fesen, MD received $2,735.26 in general payments during 2025 across 151 reported records.

PFIZER INC. accounted for 9.0% of that reported general-payment amount.

The Open Payments records used for this analysis explicitly named 63 associated products.

A separate comparison found the same explicitly named product in public Medicare Part D data: Imbruvica, Verzenio, Xtandi.

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 IMBRUVICA as an associated drug or biological on 15599 records involving 6881 distinct recipient NPIs. Public Medicare Part D data also shows 43 claims for Imbruvica 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 XTANDI as an associated drug or biological on 98 records involving 88 distinct recipient NPIs. Public Medicare Part D data also shows 12 claims for Xtandi by this doctor in 2024.

Incyte 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 JAKAFI as an associated drug or biological on 14854 records involving 6477 distinct recipient NPIs. Public Medicare Part D data also shows 12 claims for Jakafi 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 IMBRUVICA as an associated drug or biological on 47 records involving 33 distinct recipient NPIs. Public Medicare Part D data also shows 43 claims for Imbruvica 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 25 claims for Xarelto 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 VERZENIO as an associated drug or biological on 9278 records involving 4763 distinct recipient NPIs. Public Medicare Part D data also shows 12 claims for Verzenio 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 XTANDI as an associated drug or biological on 19368 records involving 7657 distinct recipient NPIs. Public Medicare Part D data also shows 12 claims for Xtandi by this doctor in 2024.

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

Payment overview · 2025

General Payments

$2,735.26

151 reported records · 38 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
PFIZER INC. Unresolved — no canonical attribution shown $245.759.0%252025
Gilead Sciences, Inc. Unresolved — no canonical attribution shown $193.257.1%62025
AstraZeneca Pharmaceuticals LP Unresolved — no canonical attribution shown $161.105.9%82025
ABBVIE INC. Unresolved — no canonical attribution shown $142.075.2%92025
Janssen Biotech, Inc. Unresolved — no canonical attribution shown $138.695.1%122025
TerSera Therapeutics LLC Unresolved — no canonical attribution shown $137.415.0%62025
GlaxoSmithKline, LLC. Unresolved — no canonical attribution shown $135.345.0%112025
Novartis Pharmaceuticals Corporation Unresolved — no canonical attribution shown $127.394.7%52025
SOBI, INC Unresolved — no canonical attribution shown $124.104.5%62025
Regeneron Healthcare Solutions, Inc. Unresolved — no canonical attribution shown $116.844.3%42025
Daiichi Sankyo Inc. Unresolved — no canonical attribution shown $111.394.1%42025
JAZZ PHARMACEUTICALS INC. Unresolved — no canonical attribution shown $108.304.0%62025
Takeda Pharmaceuticals U.S.A., Inc. Unresolved — no canonical attribution shown $105.993.9%52025
Incyte Corporation Unresolved — no canonical attribution shown $85.253.1%52025
RECORDATI_RARE_DISEASES_INC. Unresolved — no canonical attribution shown $68.152.5%42025
Sumitomo Pharma America, Inc. Unresolved — no canonical attribution shown $52.411.9%32025
Lilly USA, LLC Unresolved — no canonical attribution shown $50.271.8%22025
Stemline Therapeutics Inc. Unresolved — no canonical attribution shown $49.811.8%32025
Karyopharm Therapeutics Inc. Unresolved — no canonical attribution shown $49.451.8%22025
Ipsen Biopharmaceuticals, Inc Unresolved — no canonical attribution shown $48.751.8%22025
Genentech USA, Inc. Unresolved — no canonical attribution shown $48.171.8%22025
Iovance Biotherapeutics, Inc. Unresolved — no canonical attribution shown $46.731.7%32025
Integra LifeSciences Corporation Unresolved — no canonical attribution shown $43.891.6%12025
TAIHO ONCOLOGY, INC. Unresolved — no canonical attribution shown $38.361.4%22025
Spectrum Pharmaceuticals Inc. Unresolved — no canonical attribution shown $31.291.1%22025
ARRAY BIOPHARMA INC Unresolved — no canonical attribution shown $27.731.0%12025
Boehringer Ingelheim Pharmaceuticals, Inc. Unresolved — no canonical attribution shown $26.641.0%12025
Adaptive Biotechnologies Corporation Unresolved — no canonical attribution shown $25.590.9%12025
KYOWA KIRIN, INC. Unresolved — no canonical attribution shown $24.050.9%12025
Geron Corporation Unresolved — no canonical attribution shown $23.940.9%12025
Apellis Pharmaceuticals, Inc. Unresolved — no canonical attribution shown $21.500.8%12025
GENZYME CORPORATION Unresolved — no canonical attribution shown $21.260.8%12025
Celgene Corporation Unresolved — no canonical attribution shown $19.010.7%12025
Immunocore Limited Unresolved — no canonical attribution shown $19.010.7%12025
Azurity Pharmaceuticals, Inc. Unresolved — no canonical attribution shown $18.000.7%12025
SpringWorks Therapeutics, Inc. Unresolved — no canonical attribution shown $16.670.6%12025
Fresenius Kabi USA, LLC Unresolved — no canonical attribution shown $16.110.6%12025
Myriad Genetic Laboratories, Inc. Unresolved — no canonical attribution shown $15.600.6%12025

What were the payments for?

Payment categories

CategoryAmountRecords
Food and Beverage$2,635.27150
Education$99.991

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
Trodelvy
Normalized: trodelvy
Drug Gilead Sciences, Inc. $193.25 6 2025
Source payment records
ENHERTU
Normalized: enhertu
Biological, Drug AstraZeneca Pharmaceuticals LP, Daiichi Sankyo Inc. $136.22 5 2025
Source payment records
ORGOVYX
Normalized: orgovyx
Drug PFIZER INC., Sumitomo Pharma America, Inc. $120.17 12 2025
Source payment records
LIBTAYO
Normalized: libtayo
Biological Regeneron Healthcare Solutions, Inc. $116.84 4 2025
Source payment records
IBRANCE
Normalized: ibrance
Drug PFIZER INC. $107.42 12 2025
Source payment records
TUKYSA
Normalized: tukysa
Drug PFIZER INC. $107.42 12 2025
Source payment records
Zoladex
Normalized: zoladex
Drug TerSera Therapeutics LLC $85.96 4 2025
Source payment records
ZEPZELCA
Normalized: zepzelca
Drug JAZZ PHARMACEUTICALS INC. $85.36 5 2025
Source payment records
MONJUVI
Normalized: monjuvi
Drug Incyte Corporation $85.25 5 2025
Source payment records
VENCLEXTA
Normalized: venclexta
Biological, Drug ABBVIE INC., Genentech USA, Inc. $79.48 3 2025
Source payment records
ICLUSIG
Normalized: iclusig
Drug Takeda Pharmaceuticals U.S.A., Inc. $77.98 4 2025
Source payment records
KISQALI
Normalized: kisqali
Drug Novartis Pharmaceuticals Corporation $76.10 3 2025
Source payment records
PADCEV
Normalized: padcev
Biological PFIZER INC. $70.57 4 2025
Source payment records
Doptelet
Normalized: doptelet
Drug SOBI, INC $69.75 3 2025
Source payment records
SYLVANT
Normalized: sylvant
Drug RECORDATI_RARE_DISEASES_INC. $68.15 4 2025
Source payment records
TALZENNA
Normalized: talzenna
Drug PFIZER INC. $67.76 9 2025
Source payment records
XTANDI
Normalized: xtandi
Drug PFIZER INC. $67.76 9 2025
Source payment records
JEMPERLI
Normalized: jemperli
Biological GlaxoSmithKline, LLC. $66.38 3 2025
Source payment records
ZEJULA
Normalized: zejula
Drug GlaxoSmithKline, LLC. $66.38 3 2025
Source payment records
Vonjo
Normalized: vonjo
Drug SOBI, INC $54.35 3 2025
Source payment records
OJJAARA
Normalized: ojjaara
Drug GlaxoSmithKline, LLC. $53.38 7 2025
Source payment records
Xermelo
Normalized: xermelo
Drug TerSera Therapeutics LLC $51.45 2 2025
Source payment records
PLUVICTO
Normalized: pluvicto
Drug Novartis Pharmaceuticals Corporation $51.29 2 2025
Source payment records
VERZENIO
Normalized: verzenio
Drug Lilly USA, LLC $50.27 2 2025
Source payment records
Orserdu
Normalized: orserdu
Drug Stemline Therapeutics Inc. $49.81 3 2025
Source payment records
XPOVIO
Normalized: xpovio
Drug Karyopharm Therapeutics Inc. $49.45 2 2025
Source payment records
Onivyde
Normalized: onivyde
Drug Ipsen Biopharmaceuticals, Inc $48.75 2 2025
Source payment records
Amtagvi
Normalized: amtagvi
Drug Iovance Biotherapeutics, Inc. $46.73 3 2025
Source payment records
ERLEADA
Normalized: erleada
Drug Janssen Biotech, Inc. $46.32 4 2025
Source payment records
EPKINLY
Normalized: epkinly
Drug ABBVIE INC. $46.03 4 2025
Source payment records
IMBRUVICA
Normalized: imbruvica
Drug ABBVIE INC. $46.03 4 2025
Source payment records
Integra
Normalized: integra
Device Integra LifeSciences Corporation $43.89 1 2025
Source payment records
Integra Dermal Regeneration Template
Normalized: integra dermal regeneration template
Device Integra LifeSciences Corporation $43.89 1 2025
Source payment records
PRIMATRIX
Normalized: primatrix
Device Integra LifeSciences Corporation $43.89 1 2025
Source payment records
RYBREVANT
Normalized: rybrevant
Drug Janssen Biotech, Inc. $41.62 6 2025
Source payment records
DARZALEX
Normalized: darzalex
Biological Janssen Biotech, Inc. $41.00 1 2025
Source payment records
TECVAYLI
Normalized: tecvayli
Biological Janssen Biotech, Inc. $41.00 1 2025
Source payment records
INQOVI
Normalized: inqovi
Drug TAIHO ONCOLOGY, INC. $38.36 2 2025
Source payment records
LONSURF
Normalized: lonsurf
Drug TAIHO ONCOLOGY, INC. $38.36 2 2025
Source payment records
IMFINZI
Normalized: imfinzi
Biological AstraZeneca Pharmaceuticals LP $35.65 2 2025
Source payment records
ELAHERE
Normalized: elahere
Drug ABBVIE INC. $31.43 2 2025
Source payment records
ROLVEDON
Normalized: rolvedon
Drug Spectrum Pharmaceuticals Inc. $31.29 2 2025
Source payment records
BLENREP
Normalized: blenrep
Biological GlaxoSmithKline, LLC. $29.66 4 2025
Source payment records
FRUZAQLA
Normalized: fruzaqla
Drug Takeda Pharmaceuticals U.S.A., Inc. $28.01 1 2025
Source payment records
BRAFTOVI
Normalized: braftovi
Drug ARRAY BIOPHARMA INC $27.73 1 2025
Source payment records
LORBRENA
Normalized: lorbrena
Drug ARRAY BIOPHARMA INC $27.73 1 2025
Source payment records
MEKTOVI
Normalized: mektovi
Drug ARRAY BIOPHARMA INC $27.73 1 2025
Source payment records
XALKORI
Normalized: xalkori
Drug ARRAY BIOPHARMA INC $27.73 1 2025
Source payment records
clonoSEQ
Normalized: clonoseq
Device Adaptive Biotechnologies Corporation $25.59 1 2025
Source payment records
POTELIGEO
Normalized: poteligeo
Drug KYOWA KIRIN, INC. $24.05 1 2025
Source payment records
RYTELO
Normalized: rytelo
Drug Geron Corporation $23.94 1 2025
Source payment records
ZIIHERA
Normalized: ziihera
Drug JAZZ PHARMACEUTICALS INC. $22.94 1 2025
Source payment records
Tecentriq
Normalized: tecentriq
Biological Genentech USA, Inc. $21.66 1 2025
Source payment records
Empaveli
Normalized: empaveli
Drug Apellis Pharmaceuticals, Inc. $21.50 1 2025
Source payment records
KIMMTRAK
Normalized: kimmtrak
Drug Immunocore Limited $19.01 1 2025
Source payment records
OPDUALAG
Normalized: opdualag
Drug Celgene Corporation $19.01 1 2025
Source payment records
DANZITEN
Normalized: danziten
Drug Azurity Pharmaceuticals, Inc. $18.00 1 2025
Source payment records
OGSIVEO
Normalized: ogsiveo
Drug SpringWorks Therapeutics, Inc. $16.67 1 2025
Source payment records
Stimufend
Normalized: stimufend
Biological Fresenius Kabi USA, LLC $16.11 1 2025
Source payment records
MYRISK
Normalized: myrisk
Device Myriad Genetic Laboratories, Inc. $15.60 1 2025
Source payment records
PEMAZYRE
Normalized: pemazyre
Drug Incyte Corporation $15.60 1 2025
Source payment records
LUPRON DEPOT
Normalized: lupron depot
Drug ABBVIE INC. $11.64 1 2025
Source payment records
CARVYKTI
Normalized: carvykti
Drug Janssen Biotech, Inc. $9.75 1 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
IMBRUVICA
imbruvica
2025 Imbruvica 2024 43
Beneficiary count suppressed
exact normalized Medicare Part D
VERZENIO
verzenio
2025 Verzenio 2024 12
Beneficiary count suppressed
exact normalized Medicare Part D
XTANDI
xtandi
2025 Xtandi 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 IMBRUVICA
open payments reported associated product
CMS Open Payments — General Payments
15599 supporting records · 6881 recipient NPIs · example record 1201352838
Imbruvica · 2024
Exact normalized brand match · 1 Part D row
43 suppressed by CMS
ARRAY BIOPHARMA INC
Exact reporting entity; no affiliate inference
2025 XTANDI
open payments reported associated product
CMS Open Payments — General Payments
98 supporting records · 88 recipient NPIs · example record 1228800820
Xtandi · 2024
Exact normalized brand match · 1 Part D row
12 suppressed by CMS
Incyte Corporation
Exact reporting entity; no affiliate inference
2025 JAKAFI
open payments reported associated product
CMS Open Payments — General Payments
14854 supporting records · 6477 recipient NPIs · example record 1225959940
Jakafi · 2024
Exact normalized brand match · 1 Part D row
12 suppressed by CMS
Janssen Biotech, Inc.
Exact reporting entity; no affiliate inference
2025 IMBRUVICA
open payments reported associated product
CMS Open Payments — General Payments
47 supporting records · 33 recipient NPIs · example record 1174328453
Imbruvica · 2024
Exact normalized brand match · 1 Part D row
43 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
25 suppressed by CMS
Lilly USA, LLC
Exact reporting entity; no affiliate inference
2025 VERZENIO
open payments reported associated product
CMS Open Payments — General Payments
9278 supporting records · 4763 recipient NPIs · example record 1186464449
Verzenio · 2024
Exact normalized brand match · 1 Part D row
12 suppressed by CMS
PFIZER INC.
Exact reporting entity; no affiliate inference
2025 XTANDI
open payments reported associated product
CMS Open Payments — General Payments
19368 supporting records · 7657 recipient NPIs · example record 1228794230
Xtandi · 2024
Exact normalized brand match · 1 Part D row
12 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
AcyclovirAcyclovir16427
Potassium ChloridePotassium Chloride12130
LetrozoleLetrozole11727
OlanzapineOlanzapine7928
Hydrocodone-AcetaminophenHydrocodone/Acetaminophen5614
DapsoneDapsone52suppressed
HydroxyureaHydroxyurea48suppressed
ImbruvicaIbrutinib43suppressed
FamotidineFamotidine41suppressed
Pantoprazole SodiumPantoprazole Sodium41suppressed
GabapentinGabapentin35suppressed
Oxycodone-AcetaminophenOxycodone Hcl/Acetaminophen34suppressed
AnastrozoleAnastrozole33suppressed
DexamethasoneDexamethasone3215
Levothyroxine SodiumLevothyroxine Sodium32suppressed
BrukinsaZanubrutinib30suppressed
AzithromycinAzithromycin2619
PrednisonePrednisone2512
RevlimidLenalidomide25suppressed
XareltoRivaroxaban25suppressed
ExemestaneExemestane22suppressed
AllopurinolAllopurinol21suppressed
Tamsulosin HclTamsulosin Hcl20suppressed
Oxycodone HclOxycodone Hcl19suppressed
FentanylFentanyl18suppressed
LenalidomideLenalidomide15suppressed
LevofloxacinLevofloxacin1313
HydrocortisoneHydrocortisone12suppressed
JakafiRuxolitinib Phosphate12suppressed
Morphine Sulfate ErMorphine Sulfate12suppressed
OmeprazoleOmeprazole12suppressed
Sertraline HclSertraline Hcl12suppressed
VerzenioAbemaciclib12suppressed
XtandiEnzalutamide12suppressed
Ondansetron HclOndansetron Hcl11suppressed

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 $2,735.26 · 151 records PFIZER INC. Amtagvi, BLENREP, BRAFTOVI, CARVYKTI, DANZITEN, DARZALEX, Doptelet, ELAHERE, ENHERTU, EPKINLY, ERLEADA, Empaveli, FRUZAQLA, IBRANCE, ICLUSIG, IMBRUVICA, IMFINZI, INQOVI, Integra, Integra Dermal Regeneration Template, JEMPERLI, KIMMTRAK, KISQALI, LIBTAYO, LONSURF, LORBRENA, LUPRON DEPOT, MEKTOVI, MONJUVI, MYRISK, OGSIVEO, OJJAARA, OPDUALAG, ORGOVYX, Onivyde, Orserdu, PADCEV, PEMAZYRE, PLUVICTO, POTELIGEO, PRIMATRIX, ROLVEDON, RYBREVANT, RYTELO, SYLVANT, Stimufend, TALZENNA, TECVAYLI, TUKYSA, Tecentriq, Trodelvy, VENCLEXTA, VERZENIO, Vonjo, XALKORI, XPOVIO, XTANDI, Xermelo, ZEJULA, ZEPZELCA, ZIIHERA, Zoladex, clonoSEQ 7
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