Healthcare provider profile · identity verified

Murugesan M Siddhappan, MD

Allopathic & Osteopathic Physicians|Family Medicine · DENTON, TX · NPI 1104096437

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 Murugesan M Siddhappan, MD received $371.32 in general payments during 2025 across 16 reported records.

ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) accounted for 26.6% of that reported general-payment amount.

The Open Payments records used for this analysis explicitly named 12 associated products.

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

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 Myrbetriq as an associated drug or biological on 16 records involving 16 distinct recipient NPIs. Public Medicare Part D data also shows 41 claims for Myrbetriq 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 80 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 41 claims for Mounjaro 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 110 claims for Ozempic 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 Rybelsus as an associated drug or biological on 161257 records involving 55409 distinct recipient NPIs. Public Medicare Part D data also shows 16 claims for Rybelsus 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 162 claims for Eliquis by this doctor in 2024.

Salix Pharmaceuticals, a division of Bausch Health US, 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 XIFAXAN as an associated drug or biological on 101901 records involving 33018 distinct recipient NPIs. Public Medicare Part D data also shows 11 claims for Xifaxan by this doctor in 2024.

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

Payment overview · 2025

General Payments

$371.32

16 reported records · 11 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
ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) Unresolved — no canonical attribution shown $98.6026.6%52025
Astellas Pharma US Inc Unresolved — no canonical attribution shown $68.9918.6%12025
Novo Nordisk Inc Unresolved — no canonical attribution shown $40.3410.9%22025
Corcept Therapeutics Unresolved — no canonical attribution shown $30.858.3%12025
Exact Sciences Corporation Unresolved — no canonical attribution shown $22.186.0%12025
Tonix Medicines, Inc. Unresolved — no canonical attribution shown $20.695.6%12025
Medtronic, Inc. Medtronic, Inc.
exact · evidence 2025-07-22
$19.005.1%12025
Lilly USA, LLC Unresolved — no canonical attribution shown $18.865.1%12025
Lundbeck LLC Unresolved — no canonical attribution shown $18.835.1%12025
Salix Pharmaceuticals, a division of Bausch Health US, LLC Unresolved — no canonical attribution shown $17.354.7%12025
PFIZER INC. Unresolved — no canonical attribution shown $15.634.2%12025

What were the payments for?

Payment categories

CategoryAmountRecords
Food and Beverage$302.3315
Education$68.991

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
CAPLYTA
Normalized: caplyta
Drug ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) $98.60 5 2025
Source payment records
Ozempic
Normalized: ozempic
Drug Novo Nordisk Inc $40.34 2 2025
Source payment records
Korlym
Normalized: korlym
Drug Corcept Therapeutics $30.85 1 2025
Source payment records
The Cologuard Plus Collection Kit
Normalized: the cologuard plus collection kit
Device Exact Sciences Corporation $22.18 1 2025
Source payment records
TONMYA
Normalized: tonmya
Drug Tonix Medicines, Inc. $20.69 1 2025
Source payment records
Rybelsus
Normalized: rybelsus
Drug Novo Nordisk Inc $20.11 1 2025
Source payment records
INCEPTIV
Normalized: inceptiv
Device Medtronic, Inc. $19.00 1 2025
Source payment records
MOUNJARO
Normalized: mounjaro
Drug Lilly USA, LLC $18.86 1 2025
Source payment records
ZEPBOUND
Normalized: zepbound
Drug Lilly USA, LLC $18.86 1 2025
Source payment records
VYEPTI
Normalized: vyepti
Biological Lundbeck LLC $18.83 1 2025
Source payment records
XIFAXAN
Normalized: xifaxan
Drug Salix Pharmaceuticals, a division of Bausch Health US, LLC $17.35 1 2025
Source payment records
  • 2025-06-10 · Salix Pharmaceuticals, a division of Bausch Health US, LLC · $17.35 · Open Payments source
PAXLOVID
Normalized: paxlovid
Drug PFIZER INC. $15.63 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
MOUNJARO
mounjaro
2025 Mounjaro 2024 41
Beneficiary count suppressed
exact normalized Medicare Part D
Ozempic
ozempic
2025 Ozempic 2024 110 exact normalized Medicare Part D
Rybelsus
rybelsus
2025 Rybelsus 2024 16
Beneficiary count suppressed
exact normalized Medicare Part D
XIFAXAN
xifaxan
2025 Xifaxan 2024 11
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
Astellas Pharma US Inc
Exact reporting entity; no affiliate inference
2025 Myrbetriq
open payments reported associated product
CMS Open Payments — General Payments
16 supporting records · 16 recipient NPIs · example record 1238599014
Myrbetriq · 2024
Exact normalized brand match · 1 Part D row
41 suppressed by CMS
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
80 21
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
41 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
110 18
Novo Nordisk Inc
Exact reporting entity; no affiliate inference
2025 Rybelsus
open payments reported associated product
CMS Open Payments — General Payments
161257 supporting records · 55409 recipient NPIs · example record 1188130076
Rybelsus · 2024
Exact normalized brand match · 1 Part D row
16 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
162 20
Salix Pharmaceuticals, a division of Bausch Health US, LLC
Exact reporting entity; no affiliate inference
2025 XIFAXAN
open payments reported associated product
CMS Open Payments — General Payments
101901 supporting records · 33018 recipient NPIs · example record 1231775337
Xifaxan · 2024
Exact normalized brand match · 1 Part D row
11 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
Atorvastatin CalciumAtorvastatin Calcium535142
Levothyroxine SodiumLevothyroxine Sodium42698
GabapentinGabapentin31280
Amlodipine BesylateAmlodipine Besylate27975
Potassium ChloridePotassium Chloride26767
Hydrocodone-AcetaminophenHydrocodone/Acetaminophen25444
FurosemideFurosemide24768
LisinoprilLisinopril23866
Pantoprazole SodiumPantoprazole Sodium22063
Rosuvastatin CalciumRosuvastatin Calcium19357
Metformin HclMetformin Hcl18348
MethylprednisoloneMethylprednisolone178113
Albuterol Sulfate HfaAlbuterol Sulfate16253
EliquisApixaban16220
OmeprazoleOmeprazole16147
Trazodone HclTrazodone Hcl16044
Montelukast SodiumMontelukast Sodium15940
AzithromycinAzithromycin12888
Tamsulosin HclTamsulosin Hcl12837
Metoprolol SuccinateMetoprolol Succinate12034
Losartan PotassiumLosartan Potassium11826
Tramadol HclTramadol Hcl11832
LevofloxacinLevofloxacin11774
Tizanidine HclTizanidine Hcl11729
Metoprolol TartrateMetoprolol Tartrate11630
MeloxicamMeloxicam11026
OzempicSemaglutide11018
SimvastatinSimvastatin11023
Ondansetron HclOndansetron Hcl10232
Alendronate SodiumAlendronate Sodium9628
CarvedilolCarvedilol9535
Vitamin D2Ergocalciferol (Vitamin D2)8935
Duloxetine HclDuloxetine Hcl8622
AllopurinolAllopurinol8519
ClonazepamClonazepam8013
JardianceEmpagliflozin8021
IbuprofenIbuprofen7819
Clonidine HclClonidine Hcl7735
Lisinopril-HydrochlorothiazideLisinopril/Hydrochlorothiazide7719
LorazepamLorazepam7417
FinasterideFinasteride7222
PregabalinPregabalin7114
Sertraline HclSertraline Hcl7115
LatanoprostLatanoprost69suppressed
ClopidogrelClopidogrel Bisulfate6118
Pravastatin SodiumPravastatin Sodium6015
Fluticasone PropionateFluticasone Propionate5927
Zolpidem TartrateZolpidem Tartrate59suppressed
Cyclobenzaprine HclCyclobenzaprine Hcl5817
JanuviaSitagliptin Phosphate57suppressed
DiazepamDiazepam56suppressed
Meclizine HclMeclizine Hcl5416
Escitalopram OxalateEscitalopram Oxalate53suppressed
Folic AcidFolic Acid5215
PrednisonePrednisone5018
Propranolol HclPropranolol Hcl49suppressed
Ciprofloxacin HclCiprofloxacin Hcl4836
Fluoxetine HclFluoxetine Hcl4811
FenofibrateFenofibrate Nanocrystallized47suppressed
HydrochlorothiazideHydrochlorothiazide4715
AlprazolamAlprazolam46suppressed
Acetaminophen-CodeineAcetaminophen With Codeine45suppressed
Buspirone HclBuspirone Hcl4513
GlimepirideGlimepiride44suppressed
CefuroximeCefuroxime Axetil4233
Oxybutynin ChlorideOxybutynin Chloride42suppressed
MounjaroTirzepatide41suppressed
MyrbetriqMirabegron41suppressed
Toujeo SolostarInsulin Glargine,hum.Rec.Anlog41suppressed
LevetiracetamLevetiracetam38suppressed
Tresiba Flextouch U-200Insulin Degludec3811
Bupropion XlBupropion Hcl3713
Donepezil HclDonepezil Hcl3711
Lantus SolostarInsulin Glargine,hum.Rec.Anlog37suppressed
SucralfateSucralfate3612
Ondansetron OdtOndansetron35suppressed
Amitriptyline HclAmitriptyline Hcl34suppressed
GemfibrozilGemfibrozil34suppressed
Losartan-HydrochlorothiazideLosartan/Hydrochlorothiazide34suppressed
MetronidazoleMetronidazole3424
Triamcinolone AcetonideTriamcinolone Acetonide3425
BumetanideBumetanide32suppressed
EstradiolEstradiol32suppressed
Quetiapine FumarateQuetiapine Fumarate3211
ValsartanValsartan32suppressed
Esomeprazole MagnesiumEsomeprazole Magnesium31suppressed
AcyclovirAcyclovir3011
Breo ElliptaFluticasone/Vilanterol30suppressed
Diclofenac SodiumDiclofenac Sodium30suppressed
AmoxicillinAmoxicillin2922
CelecoxibCelecoxib29suppressed
Dicyclomine HclDicyclomine Hcl2917
Oxybutynin Chloride ErOxybutynin Chloride29suppressed
FebuxostatFebuxostat28suppressed
GlipizideGlipizide28suppressed
Hydroxyzine HclHydroxyzine Hcl2817
Levocetirizine DihydrochlorideLevocetirizine Dihydrochloride28suppressed
LidocaineLidocaine28suppressed
Asa-Butalb-Caffeine-CodeineCodeine/Butalbital/Asa/Caffein27suppressed
MethocarbamolMethocarbamol27suppressed
FluconazoleFluconazole2414
Memantine HclMemantine Hcl24suppressed
Memantine Hcl ErMemantine Hcl24suppressed
NystatinNystatin2414
AripiprazoleAripiprazole23suppressed
MirtazapineMirtazapine23suppressed
Paroxetine HclParoxetine Hcl23suppressed
SpironolactoneSpironolactone23suppressed
Ipratropium BromideIpratropium Bromide22suppressed
Isosorbide Mononitrate ErIsosorbide Mononitrate22suppressed
LovastatinLovastatin22suppressed
Novolog FlexpenInsulin Aspart22suppressed
Sumatriptan SuccinateSumatriptan Succinate22suppressed
TradjentaLinagliptin22suppressed
Amoxicillin-Clavulanate PotassAmoxicillin/Potassium Clav2119
TorsemideTorsemide21suppressed
Doxycycline HyclateDoxycycline Hyclate20suppressed
Sulfamethoxazole-TrimethoprimSulfamethoxazole/Trimethoprim2016
Valsartan-HydrochlorothiazideValsartan/Hydrochlorothiazide20suppressed
Bupropion Hcl SrBupropion Hcl19suppressed
Nifedipine ErNifedipine19suppressed
Pramipexole DihydrochloridePramipexole Di-Hcl19suppressed
Ropinirole HclRopinirole Hcl19suppressed
Venlafaxine HclVenlafaxine Hcl19suppressed
EzetimibeEzetimibe18suppressed
Hydralazine HclHydralazine Hcl18suppressed
Nebivolol HclNebivolol Hcl18suppressed
Brimonidine TartrateBrimonidine Tartrate17suppressed
Colestipol HclColestipol Hcl17suppressed
PhenytoinPhenytoin17suppressed
Terbinafine HclTerbinafine Hcl17suppressed
TopiramateTopiramate17suppressed
RybelsusSemaglutide16suppressed
Amiodarone HclAmiodarone Hcl15suppressed
FarxigaDapagliflozin Propanediol15suppressed
OlanzapineOlanzapine15suppressed
RisperidoneRisperidone15suppressed
AmantadineAmantadine Hcl14suppressed
Clindamycin HclClindamycin Hcl1411
Incruse ElliptaUmeclidinium Bromide14suppressed
MoxifloxacinMoxifloxacin Hcl14suppressed
Nortriptyline HclNortriptyline Hcl14suppressed
Olmesartan MedoxomilOlmesartan Medoxomil14suppressed
SynthroidLevothyroxine Sodium14suppressed
VraylarCariprazine Hcl14suppressed
XareltoRivaroxaban14suppressed
Advair HfaFluticasone Propion/Salmeterol13suppressed
BaclofenBaclofen13suppressed
BiktarvyBictegrav/Emtricit/Tenofov Ala13suppressed
Breztri AerosphereBudesonide/Glycopyr/Formoterol13suppressed
CholestyramineCholestyramine (With Sugar)13suppressed
DexamethasoneDexamethasone13suppressed
Nano 2nd Gen Pen NeedlePen Needle, Diabetic13suppressed
AnastrozoleAnastrozole12suppressed
AtenololAtenolol12suppressed
Basaglar Kwikpen U-100Insulin Glargine,hum.Rec.Anlog12suppressed
Bethanechol ChlorideBethanechol Chloride12suppressed
Dextroamphetamine-AmphetamineDextroamphetamine/Amphetamine12suppressed
Enalapril MaleateEnalapril Maleate12suppressed
EszopicloneEszopiclone12suppressed
FenofibrateFenofibrate12suppressed
Levetiracetam ErLevetiracetam12suppressed
PhenobarbitalPhenobarbital12suppressed
TriazolamTriazolam12suppressed
Vilazodone HclVilazodone Hcl12suppressed
Azelastine HclAzelastine Hcl11suppressed
Butalbital-Acetaminophen-CaffeButalb/Acetaminophen/Caffeine11suppressed
Cyanocobalamin InjectionCyanocobalamin (Vitamin B-12)11suppressed
Diphenoxylate-AtropineDiphenoxylate Hcl/Atropine11suppressed
Warfarin SodiumWarfarin Sodium11suppressed
XifaxanRifaximin11suppressed

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 $371.32 · 16 records ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) CAPLYTA, INCEPTIV, Korlym, MOUNJARO, Ozempic, PAXLOVID, Rybelsus, TONMYA, The Cologuard Plus Collection Kit, VYEPTI, XIFAXAN, ZEPBOUND 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