Healthcare provider profile · identity verified

Dmitriy Zak, M.D.

Allopathic & Osteopathic Physicians|Internal Medicine|Hematology & Oncology · MOUNTAIN HOME, AR · NPI 1548371289

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 Dmitriy Zak, M.D. received $3,701.13 in general payments during 2025 across 63 reported records.

AstraZeneca Pharmaceuticals LP accounted for 71.9% of that reported general-payment amount.

The Open Payments records used for this analysis explicitly named 44 associated products.

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

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 CREON as an associated drug or biological on 91561 records involving 20616 distinct recipient NPIs. Public Medicare Part D data also shows 18 claims for Creon by this doctor in 2024.

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 13 claims for Imbruvica by this doctor in 2024.

Astellas Pharma US 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 11345 records involving 5418 distinct recipient NPIs. Public Medicare Part D data also shows 21 claims for Xtandi 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 14 claims for Calquence 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 80 claims for Eliquis 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 80 claims for Eliquis by this doctor in 2024.

GENZYME 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 AYVAKIT as an associated drug or biological on 4791 records involving 3585 distinct recipient NPIs. Public Medicare Part D data also shows 12 claims for Ayvakit 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 13 claims for Imbruvica 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 18 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 ABRYSVO as an associated drug or biological on 55380 records involving 31565 distinct recipient NPIs. Public Medicare Part D data also shows 32 claims for Abrysvo 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 80 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 XTANDI as an associated drug or biological on 19368 records involving 7657 distinct recipient NPIs. Public Medicare Part D data also shows 21 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

$3,701.13

63 reported records · 30 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
AstraZeneca Pharmaceuticals LP Unresolved — no canonical attribution shown $2,661.2171.9%72025
Daiichi Sankyo Inc. Unresolved — no canonical attribution shown $114.013.1%42025
Regeneron Healthcare Solutions, Inc. Unresolved — no canonical attribution shown $111.293.0%42025
PFIZER INC. Unresolved — no canonical attribution shown $78.002.1%52025
Bayer Healthcare Pharmaceuticals Inc. Unresolved — no canonical attribution shown $70.501.9%42025
GENZYME CORPORATION Unresolved — no canonical attribution shown $62.301.7%32025
Janssen Biotech, Inc. Unresolved — no canonical attribution shown $50.241.4%22025
Merck Sharp & Dohme LLC Unresolved — no canonical attribution shown $46.751.3%32025
Iovance Biotherapeutics, Inc. Unresolved — no canonical attribution shown $46.031.2%32025
Celgene Corporation Unresolved — no canonical attribution shown $45.221.2%32025
Syndax Pharmaceuticals, Inc. Unresolved — no canonical attribution shown $34.350.9%12025
Novartis Pharmaceuticals Corporation Unresolved — no canonical attribution shown $33.690.9%22025
PUMA BIOTECHNOLOGY, INC. Unresolved — no canonical attribution shown $30.910.8%22025
Apellis Pharmaceuticals, Inc. Unresolved — no canonical attribution shown $30.290.8%12025
Karyopharm Therapeutics Inc. Unresolved — no canonical attribution shown $28.260.8%22025
Incyte Corporation Unresolved — no canonical attribution shown $27.700.8%22025
Eisai Inc. Unresolved — no canonical attribution shown $27.140.7%22025
SOBI, INC Unresolved — no canonical attribution shown $22.410.6%12025
E.R. Squibb & Sons, L.L.C. Unresolved — no canonical attribution shown $17.420.5%12025
Immunocore Limited Unresolved — no canonical attribution shown $16.350.4%12025
Genmab U.S., Inc. Unresolved — no canonical attribution shown $15.990.4%12025
Acrotech Biopharma Inc. Unresolved — no canonical attribution shown $15.980.4%12025
KYOWA KIRIN, INC. Unresolved — no canonical attribution shown $15.870.4%12025
Lilly USA, LLC Unresolved — no canonical attribution shown $15.250.4%12025
JAZZ PHARMACEUTICALS INC. Unresolved — no canonical attribution shown $15.240.4%12025
Fennec Pharmaceuticals, Inc. Unresolved — no canonical attribution shown $13.970.4%12025
Astellas Pharma US Inc Unresolved — no canonical attribution shown $13.840.4%12025
ABBVIE INC. Unresolved — no canonical attribution shown $13.810.4%12025
Ipsen Biopharmaceuticals, Inc Unresolved — no canonical attribution shown $13.650.4%12025
Spectrum Pharmaceuticals Inc. Unresolved — no canonical attribution shown $13.460.4%12025

What were the payments for?

Payment categories

CategoryAmountRecords
Consulting Fee$2,200.001
Food and Beverage$1,147.9060
Travel and Lodging$322.941
Education$30.291

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
ENHERTU
Normalized: enhertu
Biological, Drug AstraZeneca Pharmaceuticals LP, Daiichi Sankyo Inc. $132.97 6 2025
Source payment records
LIBTAYO
Normalized: libtayo
Biological Regeneron Healthcare Solutions, Inc. $111.29 4 2025
Source payment records
Nubeqa
Normalized: nubeqa
Drug Bayer Healthcare Pharmaceuticals Inc. $70.50 4 2025
Source payment records
KEYTRUDA
Normalized: keytruda
Biological Merck Sharp & Dohme LLC $46.75 3 2025
Source payment records
IBRANCE
Normalized: ibrance
Drug PFIZER INC. $46.74 3 2025
Source payment records
TUKYSA
Normalized: tukysa
Drug PFIZER INC. $46.74 3 2025
Source payment records
Amtagvi
Normalized: amtagvi
Drug Iovance Biotherapeutics, Inc. $46.03 3 2025
Source payment records
REBLOZYL
Normalized: reblozyl
Biological Celgene Corporation $45.22 3 2025
Source payment records
IMFINZI
Normalized: imfinzi
Biological AstraZeneca Pharmaceuticals LP $39.74 1 2025
Source payment records
AYVAKIT
Normalized: ayvakit
Biological GENZYME CORPORATION $35.00 2 2025
Source payment records
WELIREG
Normalized: welireg
Drug Merck Sharp & Dohme LLC $31.49 2 2025
Source payment records
ADCETRIS
Normalized: adcetris
Biological PFIZER INC. $31.26 2 2025
Source payment records
ELREXFIO
Normalized: elrexfio
Drug PFIZER INC. $31.26 2 2025
Source payment records
NERLYNX
Normalized: nerlynx
Drug PUMA BIOTECHNOLOGY, INC. $30.91 2 2025
Source payment records
Stivarga
Normalized: stivarga
Drug Bayer Healthcare Pharmaceuticals Inc. $30.67 2 2025
Source payment records
Empaveli
Normalized: empaveli
Drug Apellis Pharmaceuticals, Inc. $30.29 1 2025
Source payment records
DATROWAY
Normalized: datroway
Drug Daiichi Sankyo Inc. $29.57 1 2025
Source payment records
CARVYKTI
Normalized: carvykti
Drug Janssen Biotech, Inc. $29.51 1 2025
Source payment records
Vitrakvi
Normalized: vitrakvi
Drug Bayer Healthcare Pharmaceuticals Inc. $28.71 2 2025
Source payment records
XPOVIO
Normalized: xpovio
Drug Karyopharm Therapeutics Inc. $28.26 2 2025
Source payment records
SARCLISA
Normalized: sarclisa
Biological GENZYME CORPORATION $27.30 1 2025
Source payment records
Lenvima
Normalized: lenvima
Drug Eisai Inc. $27.14 2 2025
Source payment records
Xofigo
Normalized: xofigo
Drug Bayer Healthcare Pharmaceuticals Inc. $26.37 1 2025
Source payment records
Vonjo
Normalized: vonjo
Drug SOBI, INC $22.41 1 2025
Source payment records
RYBREVANT
Normalized: rybrevant
Drug Janssen Biotech, Inc. $20.73 1 2025
Source payment records
KISQALI
Normalized: kisqali
Drug Novartis Pharmaceuticals Corporation $19.69 1 2025
Source payment records
OPDIVO
Normalized: opdivo
Biological E.R. Squibb & Sons, L.L.C. $17.42 1 2025
Source payment records
KEYTRUDA QLEX
Normalized: keytruda qlex
Biological Merck Sharp & Dohme LLC $17.35 1 2025
Source payment records
KIMMTRAK
Normalized: kimmtrak
Drug Immunocore Limited $16.35 1 2025
Source payment records
BOSULIF
Normalized: bosulif
Drug PFIZER INC. $16.15 1 2025
Source payment records
Epkinly
Normalized: epkinly
Drug Genmab U.S., Inc. $15.99 1 2025
Source payment records
BELEODAQ
Normalized: beleodaq
Drug Acrotech Biopharma Inc. $15.98 1 2025
Source payment records
POTELIGEO
Normalized: poteligeo
Drug KYOWA KIRIN, INC. $15.87 1 2025
Source payment records
JAYPIRCA
Normalized: jaypirca
Drug Lilly USA, LLC $15.25 1 2025
Source payment records
VERZENIO
Normalized: verzenio
Drug Lilly USA, LLC $15.25 1 2025
Source payment records
ZEPZELCA
Normalized: zepzelca
Drug JAZZ PHARMACEUTICALS INC. $15.24 1 2025
Source payment records
SCEMBLIX
Normalized: scemblix
Drug Novartis Pharmaceuticals Corporation $14.00 1 2025
Source payment records
Fyarro
Normalized: fyarro
Drug Fennec Pharmaceuticals, Inc. $13.97 1 2025
Source payment records
MONJUVI
Normalized: monjuvi
Drug Incyte Corporation $13.93 1 2025
Source payment records
Vyloy
Normalized: vyloy
Drug Astellas Pharma US Inc $13.84 1 2025
Source payment records
ELAHERE
Normalized: elahere
Drug ABBVIE INC. $13.81 1 2025
Source payment records
ZYNYZ
Normalized: zynyz
Drug Incyte Corporation $13.77 1 2025
Source payment records
Onivyde
Normalized: onivyde
Drug Ipsen Biopharmaceuticals, Inc $13.65 1 2025
Source payment records
ROLVEDON
Normalized: rolvedon
Drug Spectrum Pharmaceuticals Inc. $13.46 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
AYVAKIT
ayvakit
2025 Ayvakit 2024 12
Beneficiary count suppressed
exact normalized Medicare Part D
VERZENIO
verzenio
2025 Verzenio 2024 18
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 CREON
open payments reported associated product
CMS Open Payments — General Payments
91561 supporting records · 20616 recipient NPIs · example record 1201352608
Creon · 2024
Exact normalized brand match · 1 Part D row
18 suppressed by CMS
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
13 suppressed by CMS
Astellas Pharma US Inc
Exact reporting entity; no affiliate inference
2025 Xtandi
open payments reported associated product
CMS Open Payments — General Payments
11345 supporting records · 5418 recipient NPIs · example record 1238560686
Xtandi · 2024
Exact normalized brand match · 1 Part D row
21 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
14 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
80 22
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
80 22
GENZYME CORPORATION
Exact reporting entity; no affiliate inference
2025 AYVAKIT
open payments reported associated product
CMS Open Payments — General Payments
4791 supporting records · 3585 recipient NPIs · example record 1233194960
Ayvakit · 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
13 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
18 suppressed by CMS
PFIZER INC.
Exact reporting entity; no affiliate inference
2025 ABRYSVO
open payments reported associated product
CMS Open Payments — General Payments
55380 supporting records · 31565 recipient NPIs · example record 1228794147
Abrysvo · 2024
Exact normalized brand match · 1 Part D row
32 32
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
80 22
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
21 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
AnastrozoleAnastrozole17451
Hydrocodone-AcetaminophenHydrocodone/Acetaminophen15069
LansoprazoleLansoprazole13365
Ondansetron HclOndansetron Hcl127102
DexamethasoneDexamethasone9149
FentanylFentanyl8728
Oxycodone HclOxycodone Hcl8228
EliquisApixaban8022
Lidocaine-PrilocaineLidocaine/Prilocaine7761
ScopolamineScopolamine7546
Potassium ChloridePotassium Chloride6938
AcyclovirAcyclovir6619
LetrozoleLetrozole5318
HydroxyureaHydroxyurea5011
OmeprazoleOmeprazole4312
Pantoprazole SodiumPantoprazole Sodium35suppressed
Prochlorperazine MaleateProchlorperazine Maleate3425
PrednisonePrednisone3313
AbrysvoRsv Vacc, Pref A And Pref B/Pf3232
Oxycodone-AcetaminophenOxycodone Hcl/Acetaminophen3115
GabapentinGabapentin2912
AlprazolamAlprazolam24suppressed
Ondansetron OdtOndansetron2420
Tamoxifen CitrateTamoxifen Citrate21suppressed
XtandiEnzalutamide21suppressed
FluconazoleFluconazole20suppressed
CreonLipase/Protease/Amylase18suppressed
VerzenioAbemaciclib18suppressed
Morphine Sulfate ErMorphine Sulfate17suppressed
TemazepamTemazepam17suppressed
AllopurinolAllopurinol15suppressed
Hydromorphone HclHydromorphone Hcl15suppressed
LevofloxacinLevofloxacin15suppressed
LorazepamLorazepam1511
Tramadol HclTramadol Hcl1512
CalquenceAcalabrutinib Maleate14suppressed
ImbruvicaIbrutinib13suppressed
RevlimidLenalidomide13suppressed
AyvakitAvapritinib12suppressed
CabometyxCabozantinib S-Malate12suppressed

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 $3,701.13 · 63 records AstraZeneca Pharmaceuticals LP ADCETRIS, AYVAKIT, Amtagvi, BELEODAQ, BOSULIF, CARVYKTI, DATROWAY, ELAHERE, ELREXFIO, ENHERTU, Empaveli, Epkinly, Fyarro, IBRANCE, IMFINZI, JAYPIRCA, KEYTRUDA, KEYTRUDA QLEX, KIMMTRAK, KISQALI, LIBTAYO, Lenvima, MONJUVI, NERLYNX, Nubeqa, OPDIVO, Onivyde, POTELIGEO, REBLOZYL, ROLVEDON, RYBREVANT, SARCLISA, SCEMBLIX, Stivarga, TUKYSA, VERZENIO, Vitrakvi, Vonjo, Vyloy, WELIREG, XPOVIO, Xofigo, ZEPZELCA, ZYNYZ 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