Healthcare provider profile · identity verified

Woo Sung Ahn, MD

Allopathic & Osteopathic Physicians|Internal Medicine · LAKEWOOD, CA · NPI 1396807806

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 Woo Sung Ahn, MD received $1,041.14 in general payments during 2025 across 59 reported records.

Aimmune Therapeutics, Inc. accounted for 28.7% of that reported general-payment amount.

The Open Payments records used for this analysis explicitly named 11 associated products.

A separate comparison found the same explicitly named product in public Medicare Part D data: Creon, Farxiga, Jardiance, Kerendia, Linzess, Ozempic, Zenpep.

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 298 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 LINZESS as an associated drug or biological on 87954 records involving 21815 distinct recipient NPIs. Public Medicare Part D data also shows 22 claims for Linzess by this doctor in 2024.

Aimmune Therapeutics, 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 ZENPEP as an associated drug or biological on 32144 records involving 12432 distinct recipient NPIs. Public Medicare Part D data also shows 53 claims for Zenpep by this doctor in 2024.

Amgen 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 PROLIA as an associated drug or biological on 20867 records involving 11744 distinct recipient NPIs. Public Medicare Part D data also shows 109 claims for Prolia 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 BRILINTA as an associated drug or biological on 993 records involving 512 distinct recipient NPIs. Public Medicare Part D data also shows 28 claims for Brilinta 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 110 claims for Farxiga by this doctor in 2024.

Bayer Healthcare 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 Kerendia as an associated drug or biological on 138674 records involving 48458 distinct recipient NPIs. Public Medicare Part D data also shows 66 claims for Kerendia 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 52 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 TRULICITY as an associated drug or biological on 71 records involving 57 distinct recipient NPIs. Public Medicare Part D data also shows 192 claims for Trulicity 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 29 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 111 claims for Rybelsus by this doctor in 2024.

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

Payment overview · 2025

General Payments

$1,041.14

59 reported records · 8 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
Aimmune Therapeutics, Inc. Unresolved — no canonical attribution shown $299.1028.7%202025
Bayer Healthcare Pharmaceuticals Inc. Unresolved — no canonical attribution shown $273.3726.3%132025
Amgen Inc. Unresolved — no canonical attribution shown $173.4416.7%132025
Sumitomo Pharma America, Inc. Unresolved — no canonical attribution shown $87.888.4%42025
ABBVIE INC. Unresolved — no canonical attribution shown $76.497.3%32025
Novo Nordisk Inc Unresolved — no canonical attribution shown $67.936.5%32025
AstraZeneca Pharmaceuticals LP Unresolved — no canonical attribution shown $44.064.2%22025
Lilly USA, LLC Unresolved — no canonical attribution shown $18.871.8%12025

What were the payments for?

Payment categories

CategoryAmountRecords
Food and Beverage$1,041.1459

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
ZENPEP
Normalized: zenpep
Drug Aimmune Therapeutics, Inc. $299.10 20 2025
Source payment records
Kerendia
Normalized: kerendia
Drug Bayer Healthcare Pharmaceuticals Inc. $273.37 13 2025
Source payment records
EVENITY
Normalized: evenity
Biological Amgen Inc. $130.44 10 2025
Source payment records
GEMTESA
Normalized: gemtesa
Drug Sumitomo Pharma America, Inc. $87.88 4 2025
Source payment records
CREON
Normalized: creon
Drug ABBVIE INC. $76.49 3 2025
Source payment records
LINZESS
Normalized: linzess
Drug ABBVIE INC. $76.49 3 2025
Source payment records
Ozempic
Normalized: ozempic
Drug Novo Nordisk Inc $46.82 2 2025
Source payment records
FARXIGA
Normalized: farxiga
Drug AstraZeneca Pharmaceuticals LP $44.06 2 2025
Source payment records
OTEZLA
Normalized: otezla
Drug Amgen Inc. $43.00 3 2025
Source payment records
REPATHA
Normalized: repatha
Biological Amgen Inc. $43.00 3 2025
Source payment records
JARDIANCE
Normalized: jardiance
Drug Lilly USA, LLC $18.87 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
CREON
creon
2025 Creon 2024 298 exact normalized Medicare Part D
FARXIGA
farxiga
2025 Farxiga 2024 110 exact normalized Medicare Part D
JARDIANCE
jardiance
2025 Jardiance 2024 52 exact normalized Medicare Part D
Kerendia
kerendia
2025 Kerendia 2024 66 exact normalized Medicare Part D
LINZESS
linzess
2025 Linzess 2024 22
Beneficiary count suppressed
exact normalized Medicare Part D
Ozempic
ozempic
2025 Ozempic 2024 29
Beneficiary count suppressed
exact normalized Medicare Part D
ZENPEP
zenpep
2025 Zenpep 2024 53
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
298 64
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
22 suppressed by CMS
Aimmune Therapeutics, Inc.
Exact reporting entity; no affiliate inference
2025 ZENPEP
open payments reported associated product
CMS Open Payments — General Payments
32144 supporting records · 12432 recipient NPIs · example record 1249641927
Zenpep · 2024
Exact normalized brand match · 1 Part D row
53 suppressed by CMS
Amgen Inc.
Exact reporting entity; no affiliate inference
2025 PROLIA
open payments reported associated product
CMS Open Payments — General Payments
20867 supporting records · 11744 recipient NPIs · example record 1226874448
Prolia · 2024
Exact normalized brand match · 1 Part D row
109 61
AstraZeneca Pharmaceuticals LP
Exact reporting entity; no affiliate inference
2025 BRILINTA
open payments reported associated product
CMS Open Payments — General Payments
993 supporting records · 512 recipient NPIs · example record 1206131430
Brilinta · 2024
Exact normalized brand match · 1 Part D row
28 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
110 21
Bayer Healthcare Pharmaceuticals Inc.
Exact reporting entity; no affiliate inference
2025 Kerendia
open payments reported associated product
CMS Open Payments — General Payments
138674 supporting records · 48458 recipient NPIs · example record 1225434663
Kerendia · 2024
Exact normalized brand match · 1 Part D row
66 26
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
52 12
Lilly USA, LLC
Exact reporting entity; no affiliate inference
2025 TRULICITY
open payments reported associated product
CMS Open Payments — General Payments
71 supporting records · 57 recipient NPIs · example record 1186464601
Trulicity · 2024
Exact normalized brand match · 1 Part D row
192 27
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
29 suppressed by CMS
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
111 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
Rosuvastatin CalciumRosuvastatin Calcium1160311
Atorvastatin CalciumAtorvastatin Calcium821208
Losartan-HydrochlorothiazideLosartan/Hydrochlorothiazide800188
Amlodipine BesylateAmlodipine Besylate732187
VascepaIcosapent Ethyl588115
Metformin Hcl ErMetformin Hcl580134
Losartan PotassiumLosartan Potassium559143
Glipizide ErGlipizide496104
ClopidogrelClopidogrel Bisulfate409104
Tamsulosin HclTamsulosin Hcl34282
TradjentaLinagliptin33354
Metoprolol SuccinateMetoprolol Succinate32373
CreonLipase/Protease/Amylase29864
CelecoxibCelecoxib25595
Icosapent EthylIcosapent Ethyl25172
CarvedilolCarvedilol22357
MyrbetriqMirabegron21440
AzithromycinAzithromycin202155
TrulicityDulaglutide19227
Alendronate SodiumAlendronate Sodium19051
FinasterideFinasteride19045
GabapentinGabapentin18454
Levothyroxine SodiumLevothyroxine Sodium17946
AllopurinolAllopurinol17140
LisinoprilLisinopril15844
LidocaineLidocaine15330
FamotidineFamotidine15075
Donepezil HclDonepezil Hcl14330
Repatha SureclickEvolocumab14127
Levocetirizine DihydrochlorideLevocetirizine Dihydrochloride13441
Triamcinolone AcetonideTriamcinolone Acetonide13376
JanuviaSitagliptin Phosphate12118
Pitavastatin CalciumPitavastatin Calcium11842
FenofibrateFenofibrate Nanocrystallized11425
Alcohol SwabsAlcohol Antiseptic Pads11239
RybelsusSemaglutide11125
FarxigaDapagliflozin Propanediol11021
ProliaDenosumab10961
Diclofenac SodiumDiclofenac Sodium10730
Lisinopril-HydrochlorothiazideLisinopril/Hydrochlorothiazide10723
CephalexinCephalexin10679
Sildenafil CitrateSildenafil Citrate9833
Montelukast SodiumMontelukast Sodium9722
Sulfamethoxazole-TrimethoprimSulfamethoxazole/Trimethoprim9169
GlimepirideGlimepiride8417
Pioglitazone HclPioglitazone Hcl8319
SimvastatinSimvastatin8317
AtenololAtenolol7919
MeloxicamMeloxicam7929
Potassium ChloridePotassium Chloride7534
OmeprazoleOmeprazole7424
FurosemideFurosemide7133
KerendiaFinerenone6626
XareltoRivaroxaban65suppressed
HydrochlorothiazideHydrochlorothiazide6419
LivaloPitavastatin Calcium6321
KetoconazoleKetoconazole5517
EliquisApixaban5312
ZenpepLipase/Protease/Amylase53suppressed
JardianceEmpagliflozin5212
Metformin HclMetformin Hcl5115
Isosorbide Mononitrate ErIsosorbide Mononitrate50suppressed
Memantine HclMemantine Hcl4812
AcyclovirAcyclovir4628
Nifedipine ErNifedipine4413
Oxybutynin Chloride ErOxybutynin Chloride4416
Fluticasone PropionateFluticasone Propionate4219
Omega-3 Acid Ethyl EstersOmega-3 Acid Ethyl Esters4215
Ranolazine ErRanolazine41suppressed
Olmesartan MedoxomilOlmesartan Medoxomil40suppressed
Lantus SolostarInsulin Glargine,hum.Rec.Anlog3911
EzetimibeEzetimibe3812
Memantine Hcl ErMemantine Hcl38suppressed
Repatha PushtronexEvolocumab37suppressed
Duloxetine HclDuloxetine Hcl3611
SotalolSotalol Hcl36suppressed
Acetaminophen-CodeineAcetaminophen With Codeine3517
Metoclopramide HclMetoclopramide Hcl35suppressed
Clonidine HclClonidine Hcl3411
Tenofovir Disoproxil FumarateTenofovir Disoproxil Fumarate34suppressed
DutasterideDutasteride33suppressed
Doxazosin MesylateDoxazosin Mesylate32suppressed
Repatha SyringeEvolocumab32suppressed
Hydralazine HclHydralazine Hcl3111
Pantoprazole SodiumPantoprazole Sodium31suppressed
Clotrimazole-BetamethasoneClotrimazole/Betamethasone Dip3017
MirtazapineMirtazapine3012
TadalafilTadalafil30suppressed
JanumetSitagliptin Phos/Metformin Hcl29suppressed
LovastatinLovastatin29suppressed
OzempicSemaglutide29suppressed
PaxlovidNirmatrelvir/Ritonavir2929
BrilintaTicagrelor28suppressed
TelmisartanTelmisartan28suppressed
Olmesartan-HydrochlorothiazideOlmesartan/Hydrochlorothiazide27suppressed
Ultra-Fine Mini Pen NeedlePen Needle, Diabetic27suppressed
Valsartan-HydrochlorothiazideValsartan/Hydrochlorothiazide26suppressed
Verapamil ErVerapamil Hcl26suppressed
Alcohol Prep PadsAlcohol Antiseptic Pads25suppressed
AmoxicillinAmoxicillin2317
GlipizideGlipizide23suppressed
RepaglinideRepaglinide23suppressed
Trelegy ElliptaFluticasone/Umeclidin/Vilanter23suppressed
Ciprofloxacin HclCiprofloxacin Hcl2221
LinzessLinaclotide22suppressed
Nebivolol HclNebivolol Hcl22suppressed
NitroglycerinNitroglycerin2216
Semglee (Yfgn) PenInsulin Glargine-Yfgn22suppressed
Sertraline HclSertraline Hcl22suppressed
ShingrixVaricella-Zoster Ge/As01b/Pf2216
Trazodone HclTrazodone Hcl22suppressed
Hydroxychloroquine SulfateHydroxychloroquine Sulfate2118
Metoprolol TartrateMetoprolol Tartrate21suppressed
Tramadol HclTramadol Hcl21suppressed
MethylprednisoloneMethylprednisolone2017
Calcium AcetateCalcium Acetate19suppressed
FlectorDiclofenac Epolamine19suppressed
Albuterol Sulfate HfaAlbuterol Sulfate18suppressed
Diclofenac EpolamineDiclofenac Epolamine18suppressed
AlbendazoleAlbendazole1716
Bethanechol ChlorideBethanechol Chloride17suppressed
ClotrimazoleClotrimazole1711
ColchicineColchicine17suppressed
MupirocinMupirocin17suppressed
Praluent PenAlirocumab17suppressed
SpironolactoneSpironolactone17suppressed
Betamethasone DipropionateBetamethasone Dipropionate16suppressed
LevetiracetamLevetiracetam16suppressed
Meclizine HclMeclizine Hcl16suppressed
Terazosin HclTerazosin Hcl16suppressed
UrsodiolUrsodiol16suppressed
Zolpidem TartrateZolpidem Tartrate16suppressed
EntecavirEntecavir15suppressed
EntrestoSacubitril/Valsartan15suppressed
HydrocortisoneHydrocortisone15suppressed
CilostazolCilostazol14suppressed
Pravastatin SodiumPravastatin Sodium14suppressed
PremarinEstrogens, Conjugated14suppressed
Procto-Med HcHydrocortisone14suppressed
ValsartanValsartan14suppressed
Amiodarone HclAmiodarone Hcl13suppressed
CyclosporineCyclosporine13suppressed
IbuprofenIbuprofen13suppressed
Sevelamer CarbonateSevelamer Carbonate13suppressed
Benazepril HclBenazepril Hcl12suppressed
Econazole NitrateEconazole Nitrate12suppressed
FenofibrateFenofibrate,micronized12suppressed
Galantamine HbrGalantamine Hbr12suppressed
MultaqDronedarone Hcl12suppressed
Chlorhexidine GluconateChlorhexidine Gluconate11suppressed
EdarbiAzilsartan Medoxomil11suppressed
LatanoprostLatanoprost11suppressed
MethazolamideMethazolamide11suppressed
NaproxenNaproxen11suppressed
RisperidoneRisperidone11suppressed

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 $1,041.14 · 59 records Aimmune Therapeutics, Inc. CREON, EVENITY, FARXIGA, GEMTESA, JARDIANCE, Kerendia, LINZESS, OTEZLA, Ozempic, REPATHA, ZENPEP 11
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