Healthcare provider profile · identity verified

David P Chamberlain, M.D.

Allopathic & Osteopathic Physicians|Internal Medicine · BUTTE, MT · NPI 1861423071

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 David P Chamberlain, M.D. received $1,150.47 in general payments during 2025 across 52 reported records.

ABBVIE INC. accounted for 20.8% of that reported general-payment amount.

The Open Payments records used for this analysis explicitly named 29 associated products.

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

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 LINZESS as an associated drug or biological on 87954 records involving 21815 distinct recipient NPIs. Public Medicare Part D data also shows 24 claims for Linzess 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 SYNTHROID as an associated drug or biological on 10655 records involving 4881 distinct recipient NPIs. Public Medicare Part D data also shows 17 claims for Synthroid 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 FARXIGA as an associated drug or biological on 106133 records involving 42906 distinct recipient NPIs. Public Medicare Part D data also shows 24 claims for Farxiga 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 35 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 95 claims for Eliquis by this doctor in 2024.

GlaxoSmithKline, 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 TRELEGY ELLIPTA as an associated drug or biological on 131532 records involving 37148 distinct recipient NPIs. Public Medicare Part D data also shows 29 claims for Trelegy Ellipta 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 43 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 95 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

$1,150.47

52 reported records · 17 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
ABBVIE INC. Unresolved — no canonical attribution shown $239.7920.8%132025
PFIZER INC. Unresolved — no canonical attribution shown $181.7715.8%62025
AstraZeneca Pharmaceuticals LP Unresolved — no canonical attribution shown $160.7014.0%32025
Amgen Inc. Unresolved — no canonical attribution shown $150.9113.1%92025
Novartis Pharmaceuticals Corporation Unresolved — no canonical attribution shown $52.814.6%22025
Boehringer Ingelheim Pharmaceuticals, Inc. Unresolved — no canonical attribution shown $51.234.5%32025
Exact Sciences Corporation Unresolved — no canonical attribution shown $50.784.4%22025
Medtronic, Inc. Medtronic, Inc.
exact · evidence 2025-07-22
$47.624.1%22025
ABIOMED Unresolved — no canonical attribution shown $41.283.6%22025
Corcept Therapeutics Unresolved — no canonical attribution shown $33.372.9%22025
Bayer Healthcare Pharmaceuticals Inc. Unresolved — no canonical attribution shown $30.142.6%22025
E.R. Squibb & Sons, L.L.C. Unresolved — no canonical attribution shown $23.062.0%12025
Inspire Medical Systems, Inc. Unresolved — no canonical attribution shown $20.101.8%12025
ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) Unresolved — no canonical attribution shown $17.461.5%12025
GlaxoSmithKline, LLC. Unresolved — no canonical attribution shown $17.051.5%12025
KYOWA KIRIN, INC. Unresolved — no canonical attribution shown $16.291.4%12025
Novo Nordisk Inc Unresolved — no canonical attribution shown $16.111.4%12025

What were the payments for?

Payment categories

CategoryAmountRecords
Food and Beverage$1,150.4752

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
FARXIGA
Normalized: farxiga
Drug AstraZeneca Pharmaceuticals LP $151.85 2 2025
Source payment records
AIRSUPRA
Normalized: airsupra
Drug AstraZeneca Pharmaceuticals LP $146.91 2 2025
Source payment records
BEVESPI AEROSPHERE
Normalized: bevespi aerosphere
Drug AstraZeneca Pharmaceuticals LP $138.06 1 2025
Source payment records
REPATHA
Normalized: repatha
Biological Amgen Inc. $134.04 8 2025
Source payment records
VELSIPITY
Normalized: velsipity
Drug PFIZER INC. $133.15 3 2025
Source payment records
UBRELVY
Normalized: ubrelvy
Drug ABBVIE INC. $123.73 5 2025
Source payment records
OTEZLA
Normalized: otezla
Drug Amgen Inc. $116.60 7 2025
Source payment records
QULIPTA
Normalized: qulipta
Drug ABBVIE INC. $91.23 4 2025
Source payment records
LEQVIO
Normalized: leqvio
Drug Novartis Pharmaceuticals Corporation $52.81 2 2025
Source payment records
JARDIANCE
Normalized: jardiance
Drug Boehringer Ingelheim Pharmaceuticals, Inc. $51.23 3 2025
Source payment records
Cologuard Collection Kit
Normalized: cologuard collection kit
Device Exact Sciences Corporation $50.78 2 2025
Source payment records
NURTEC ODT
Normalized: nurtec odt
Drug PFIZER INC. $48.62 3 2025
Source payment records
ZAVZPRET
Normalized: zavzpret
Drug PFIZER INC. $48.62 3 2025
Source payment records
EMBLAVEO
Normalized: emblaveo
Drug ABBVIE INC. $46.44 1 2025
Source payment records
DALVANCE
Normalized: dalvance
Drug ABBVIE INC. $45.20 5 2025
Source payment records
Korlym
Normalized: korlym
Drug Corcept Therapeutics $33.37 2 2025
Source payment records
Kerendia
Normalized: kerendia
Drug Bayer Healthcare Pharmaceuticals Inc. $30.14 2 2025
Source payment records
MINIMED 780G
Normalized: minimed 780g
Device Medtronic, Inc. $28.86 1 2025
Source payment records
VRAYLAR
Normalized: vraylar
Drug ABBVIE INC. $24.42 2 2025
Source payment records
CAMZYOS
Normalized: camzyos
Drug E.R. Squibb & Sons, L.L.C. $23.06 1 2025
Source payment records
INSPIRE
Normalized: inspire
Device Inspire Medical Systems, Inc. $20.10 1 2025
Source payment records
INCEPTIV
Normalized: inceptiv
Device Medtronic, Inc. $18.76 1 2025
Source payment records
CAPLYTA
Normalized: caplyta
Drug ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) $17.46 1 2025
Source payment records
TRELEGY ELLIPTA
Normalized: trelegy ellipta
Drug GlaxoSmithKline, LLC. $17.05 1 2025
Source payment records
EVENITY
Normalized: evenity
Biological Amgen Inc. $16.87 1 2025
Source payment records
CRYSVITA
Normalized: crysvita
Drug KYOWA KIRIN, INC. $16.29 1 2025
Source payment records
Ozempic
Normalized: ozempic
Drug Novo Nordisk Inc $16.11 1 2025
Source payment records
Rybelsus
Normalized: rybelsus
Drug Novo Nordisk Inc $16.11 1 2025
Source payment records
XELJANZ
Normalized: xeljanz
Drug PFIZER INC. $3.20 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
FARXIGA
farxiga
2025 Farxiga 2024 24
Beneficiary count suppressed
exact normalized Medicare Part D
JARDIANCE
jardiance
2025 Jardiance 2024 35
Beneficiary count suppressed
exact normalized Medicare Part D
Ozempic
ozempic
2025 Ozempic 2024 43
Beneficiary count suppressed
exact normalized Medicare Part D
TRELEGY ELLIPTA
trelegy ellipta
2025 Trelegy Ellipta 2024 29
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 LINZESS
open payments reported associated product
CMS Open Payments — General Payments
87954 supporting records · 21815 recipient NPIs · example record 1201352608
Linzess · 2024
Exact normalized brand match · 1 Part D row
24 suppressed by CMS
ABBVIE INC.
Exact reporting entity; no affiliate inference
2025 SYNTHROID
open payments reported associated product
CMS Open Payments — General Payments
10655 supporting records · 4881 recipient NPIs · example record 1201352636
Synthroid · 2024
Exact normalized brand match · 1 Part D row
17 suppressed by CMS
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
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
35 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
95 25
GlaxoSmithKline, LLC.
Exact reporting entity; no affiliate inference
2025 TRELEGY ELLIPTA
open payments reported associated product
CMS Open Payments — General Payments
131532 supporting records · 37148 recipient NPIs · example record 1190332369
Trelegy Ellipta · 2024
Exact normalized brand match · 1 Part D row
29 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
43 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
95 25

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 Calcium642171
Levothyroxine SodiumLevothyroxine Sodium41499
Amlodipine BesylateAmlodipine Besylate39698
LisinoprilLisinopril32282
GabapentinGabapentin31780
OmeprazoleOmeprazole24463
Tamsulosin HclTamsulosin Hcl21954
Metformin HclMetformin Hcl20863
Potassium ChloridePotassium Chloride19760
Losartan PotassiumLosartan Potassium19453
Pantoprazole SodiumPantoprazole Sodium18245
Metoprolol SuccinateMetoprolol Succinate17942
MeloxicamMeloxicam16650
FurosemideFurosemide15943
SimvastatinSimvastatin15743
AllopurinolAllopurinol14540
Zolpidem TartrateZolpidem Tartrate14519
Albuterol Sulfate HfaAlbuterol Sulfate13743
Rosuvastatin CalciumRosuvastatin Calcium12940
CelecoxibCelecoxib11234
Sertraline HclSertraline Hcl11128
EliquisApixaban9525
IrbesartanIrbesartan8927
Lantus SolostarInsulin Glargine,hum.Rec.Anlog8721
Tramadol HclTramadol Hcl8518
Metoprolol TartrateMetoprolol Tartrate8420
CarvedilolCarvedilol8022
MethocarbamolMethocarbamol7723
LorazepamLorazepam7513
Warfarin SodiumWarfarin Sodium7413
Duloxetine HclDuloxetine Hcl7018
Citalopram HbrCitalopram Hydrobromide6715
Ropinirole HclRopinirole Hcl6312
Fluoxetine HclFluoxetine Hcl58suppressed
Pravastatin SodiumPravastatin Sodium5817
HydrochlorothiazideHydrochlorothiazide5717
SpironolactoneSpironolactone5417
FinasterideFinasteride4812
GlipizideGlipizide4815
Montelukast SodiumMontelukast Sodium4712
Triamterene-HydrochlorothiazidTriamterene/Hydrochlorothiazid4712
ValsartanValsartan4712
PregabalinPregabalin46suppressed
Esomeprazole MagnesiumEsomeprazole Magnesium4312
OzempicSemaglutide43suppressed
Venlafaxine Hcl ErVenlafaxine Hcl43suppressed
Paroxetine HclParoxetine Hcl42suppressed
EzetimibeEzetimibe40suppressed
FamotidineFamotidine4015
FenofibrateFenofibrate40suppressed
Metformin Hcl ErMetformin Hcl40suppressed
ClopidogrelClopidogrel Bisulfate39suppressed
GlyxambiEmpagliflozin/Linagliptin36suppressed
JardianceEmpagliflozin35suppressed
Propranolol HclPropranolol Hcl34suppressed
Amoxicillin-Clavulanate PotassAmoxicillin/Potassium Clav3331
GlimepirideGlimepiride33suppressed
Methadone HclMethadone Hcl32suppressed
XareltoRivaroxaban32suppressed
ClonazepamClonazepam31suppressed
Escitalopram OxalateEscitalopram Oxalate30suppressed
LevofloxacinLevofloxacin3023
AtenololAtenolol29suppressed
JanuviaSitagliptin Phosphate29suppressed
LansoprazoleLansoprazole29suppressed
TorsemideTorsemide29suppressed
Trelegy ElliptaFluticasone/Umeclidin/Vilanter29suppressed
AlprazolamAlprazolam28suppressed
Fluticasone PropionateFluticasone Propionate2713
Losartan-HydrochlorothiazideLosartan/Hydrochlorothiazide27suppressed
Breo ElliptaFluticasone/Vilanterol25suppressed
Cyclobenzaprine HclCyclobenzaprine Hcl25suppressed
DigoxinDigoxin25suppressed
Diltiazem 24hr Er (Cd)Diltiazem Hcl25suppressed
MirtazapineMirtazapine25suppressed
Nitrofurantoin Mono-MacroNitrofurantoin Monohyd/M-Cryst25suppressed
FarxigaDapagliflozin Propanediol24suppressed
Hydrocodone-AcetaminophenHydrocodone/Acetaminophen24suppressed
LinzessLinaclotide24suppressed
TopiramateTopiramate24suppressed
ValacyclovirValacyclovir Hcl24suppressed
Irbesartan-HydrochlorothiazideIrbesartan/Hydrochlorothiazide23suppressed
Novolog FlexpenInsulin Aspart22suppressed
Methenamine HippurateMethenamine Hippurate21suppressed
Stiolto RespimatTiotropium Br/Olodaterol Hcl21suppressed
Buspirone HclBuspirone Hcl20suppressed
Memantine HclMemantine Hcl20suppressed
MethylprednisoloneMethylprednisolone2018
MounjaroTirzepatide20suppressed
Alendronate SodiumAlendronate Sodium19suppressed
Divalproex SodiumDivalproex Sodium19suppressed
LantusInsulin Glargine,hum.Rec.Anlog19suppressed
Lisinopril-HydrochlorothiazideLisinopril/Hydrochlorothiazide19suppressed
Sumatriptan SuccinateSumatriptan Succinate19suppressed
Donepezil HclDonepezil Hcl18suppressed
Doxycycline HyclateDoxycycline Hyclate1816
Bupropion XlBupropion Hcl17suppressed
FluconazoleFluconazole17suppressed
Glipizide ErGlipizide17suppressed
Prazosin HclPrazosin Hcl17suppressed
SynthroidLevothyroxine Sodium17suppressed
DiazepamDiazepam16suppressed
Diltiazem 24hr ErDiltiazem Hcl16suppressed
Enalapril MaleateEnalapril Maleate16suppressed
EstradiolEstradiol16suppressed
Humalog Kwikpen U-100Insulin Lispro16suppressed
Bupropion Hcl SrBupropion Hcl15suppressed
Ipratropium BromideIpratropium Bromide15suppressed
LamotrigineLamotrigine15suppressed
LatanoprostLatanoprost15suppressed
BaclofenBaclofen14suppressed
MupirocinMupirocin1412
NovologInsulin Aspart14suppressed
Ultra-Fine Mini Pen NeedlePen Needle, Diabetic14suppressed
Ultra-Fine Short Pen NeedlePen Needle, Diabetic14suppressed
Ventolin HfaAlbuterol Sulfate14suppressed
Amitriptyline HclAmitriptyline Hcl13suppressed
ColchicineColchicine13suppressed
Dicyclomine HclDicyclomine Hcl13suppressed
Klor-Con 10Potassium Chloride13suppressed
LactuloseLactulose13suppressed
NabumetoneNabumetone13suppressed
CarisoprodolCarisoprodol12suppressed
Dexlansoprazole DrDexlansoprazole12suppressed
Galantamine HbrGalantamine Hbr12suppressed
Mesalamine ErMesalamine12suppressed
Nifedipine ErNifedipine12suppressed
NystatinNystatin12suppressed
Pioglitazone HclPioglitazone Hcl12suppressed
Verapamil HclVerapamil Hcl12suppressed
Isosorbide Mononitrate ErIsosorbide Mononitrate11suppressed
KetoconazoleKetoconazole11suppressed
Liothyronine SodiumLiothyronine Sodium11suppressed
LivaloPitavastatin Calcium11suppressed
MesalamineMesalamine11suppressed
Oxybutynin Chloride ErOxybutynin Chloride11suppressed
PrednisonePrednisone11suppressed
Propranolol Hcl ErPropranolol Hcl11suppressed
Quetiapine FumarateQuetiapine Fumarate11suppressed
TemazepamTemazepam11suppressed
Trazodone HclTrazodone Hcl11suppressed
Verapamil ErVerapamil 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 $1,150.47 · 52 records ABBVIE INC. AIRSUPRA, BEVESPI AEROSPHERE, CAMZYOS, CAPLYTA, CRYSVITA, Cologuard Collection Kit, DALVANCE, EMBLAVEO, EVENITY, FARXIGA, INCEPTIV, INSPIRE, JARDIANCE, Kerendia, Korlym, LEQVIO, MINIMED 780G, NURTEC ODT, OTEZLA, Ozempic, QULIPTA, REPATHA, Rybelsus, TRELEGY ELLIPTA, UBRELVY, VELSIPITY, VRAYLAR, XELJANZ, ZAVZPRET 8
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