Healthcare provider profile · identity verified

William S Baek, M.D..

Allopathic & Osteopathic Physicians|Psychiatry & Neurology|Neurology · UPLAND, CA · NPI 1326095977

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 William S Baek, M.D.. received $11,261.59 in general payments during 2025 across 124 reported records.

ABBVIE INC. accounted for 62.9% of that reported general-payment amount.

The Open Payments records used for this analysis explicitly named 33 associated products.

A separate comparison found the same explicitly named product in public Medicare Part D data: Austedo Xr, Inbrija, Nurtec Odt, Qulipta, Ubrelvy, Vumerity.

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 QULIPTA as an associated drug or biological on 298617 records involving 58957 distinct recipient NPIs. Public Medicare Part D data also shows 22 claims for Qulipta 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 UBRELVY as an associated drug or biological on 299803 records involving 61203 distinct recipient NPIs. Public Medicare Part D data also shows 31 claims for Ubrelvy by this doctor in 2024.

Biogen, 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 VUMERITY as an associated drug or biological on 16193 records involving 4044 distinct recipient NPIs. Public Medicare Part D data also shows 15 claims for Vumerity by this doctor in 2024.

Merz Pharmaceuticals, 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 INBRIJA as an associated drug or biological on 4307 records involving 2211 distinct recipient NPIs. Public Medicare Part D data also shows 32 claims for Inbrija 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 NURTEC ODT as an associated drug or biological on 217574 records involving 54025 distinct recipient NPIs. Public Medicare Part D data also shows 11 claims for Nurtec Odt by this doctor in 2024.

Teva Pharmaceuticals USA, 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 AUSTEDO XR as an associated drug or biological on 86263 records involving 23643 distinct recipient NPIs. Public Medicare Part D data also shows 19 claims for Austedo Xr by this doctor in 2024.

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

Payment overview · 2025

General Payments

$11,261.59

124 reported records · 20 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 $7,087.0862.9%252025
Lundbeck LLC Unresolved — no canonical attribution shown $1,578.0414.0%152025
Biogen, Inc. Unresolved — no canonical attribution shown $653.235.8%142025
UCB, Inc. Unresolved — no canonical attribution shown $569.865.1%172025
PFIZER INC. Unresolved — no canonical attribution shown $222.812.0%122025
Alexion Pharmaceuticals, Inc. Unresolved — no canonical attribution shown $187.781.7%72025
Genentech USA, Inc. Unresolved — no canonical attribution shown $134.551.2%62025
Merz Pharmaceuticals, LLC Unresolved — no canonical attribution shown $124.591.1%42025
Curonix LLC Unresolved — no canonical attribution shown $102.810.9%12025
Genentech, Inc. Unresolved — no canonical attribution shown $91.550.8%22025
Novartis Pharmaceuticals Corporation Unresolved — no canonical attribution shown $78.470.7%42025
Amgen Inc. Unresolved — no canonical attribution shown $70.480.6%22025
Axsome Therapeutics, Inc. Unresolved — no canonical attribution shown $68.110.6%42025
Teva Pharmaceuticals USA, Inc. Unresolved — no canonical attribution shown $65.130.6%32025
ARGENX US, INC. Unresolved — no canonical attribution shown $59.460.5%22025
Celgene Corporation Unresolved — no canonical attribution shown $52.920.5%22025
Janssen Biotech, Inc. Unresolved — no canonical attribution shown $36.060.3%12025
SK Life Science, Inc. SK Life Science, Inc.
exact · evidence 2025-04-03
$29.460.3%12025
CATALYST PHARMACEUTICALS, INC. Unresolved — no canonical attribution shown $29.020.3%12025
JAZZ PHARMACEUTICALS INC. Unresolved — no canonical attribution shown $20.180.2%12025

What were the payments for?

Payment categories

CategoryAmountRecords
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$6,500.002
Food and Beverage$3,324.69118
Consulting Fee$1,425.002
Travel and Lodging$11.902

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
QULIPTA
Normalized: qulipta
Drug ABBVIE INC. $7,056.43 23 2025
Source payment records
UBRELVY
Normalized: ubrelvy
Drug ABBVIE INC. $3,582.21 18 2025
Source payment records
VYEPTI
Normalized: vyepti
Biological Lundbeck LLC $1,562.22 14 2025
Source payment records
VUMERITY
Normalized: vumerity
Drug Biogen, Inc. $399.84 9 2025
Source payment records
Nayzilam
Normalized: nayzilam
Drug UCB, Inc. $264.79 10 2025
Source payment records
TYSABRI
Normalized: tysabri
Biological Biogen, Inc. $245.06 3 2025
Source payment records
NURTEC ODT
Normalized: nurtec odt
Drug PFIZER INC. $198.09 11 2025
Source payment records
ULTOMIRIS
Normalized: ultomiris
Biological Alexion Pharmaceuticals, Inc. $187.78 7 2025
Source payment records
Ocrevus
Normalized: ocrevus
Biological Genentech USA, Inc., Genentech, Inc. $149.62 5 2025
Source payment records
ZAVZPRET
Normalized: zavzpret
Drug PFIZER INC. $149.15 10 2025
Source payment records
SKYCLARYS
Normalized: skyclarys
Drug Biogen, Inc. $115.68 4 2025
Source payment records
PNS FREEDOM-4A PERMANENT NEUROSTIMULATOR RECEIVER KIT CHANNEL A
Normalized: pns freedom 4a permanent neurostimulator receiver kit channel a
Device Curonix LLC $102.81 1 2025
Source payment records
INBRIJA
Normalized: inbrija
Drug Merz Pharmaceuticals, LLC $101.31 3 2025
Source payment records
Fintepla
Normalized: fintepla
Drug UCB, Inc. $98.29 4 2025
Source payment records
Ocrevus Zunovo
Normalized: ocrevus zunovo
Biological Genentech USA, Inc. $97.18 4 2025
Source payment records
BOTOX
Normalized: botox
Biological ABBVIE INC. $95.48 3 2025
Source payment records
KESIMPTA
Normalized: kesimpta
Drug Novartis Pharmaceuticals Corporation $78.47 4 2025
Source payment records
UPLIZNA
Normalized: uplizna
Biological Amgen Inc. $70.48 2 2025
Source payment records
Rystiggo
Normalized: rystiggo
Drug UCB, Inc. $68.94 2 2025
Source payment records
Symbravo
Normalized: symbravo
Drug Axsome Therapeutics, Inc. $68.11 4 2025
Source payment records
AUSTEDO XR
Normalized: austedo xr
Drug Teva Pharmaceuticals USA, Inc. $65.13 3 2025
Source payment records
VYVGART HYTRULO
Normalized: vyvgart hytrulo
Drug ARGENX US, INC. $59.46 2 2025
Source payment records
ZEPOSIA
Normalized: zeposia
Drug Celgene Corporation $52.92 2 2025
Source payment records
QALSODY
Normalized: qalsody
Drug Biogen, Inc. $29.73 1 2025
Source payment records
SPINRAZA
Normalized: spinraza
Biological Biogen, Inc. $29.73 1 2025
Source payment records
FIRDAPSE
Normalized: firdapse
Drug CATALYST PHARMACEUTICALS, INC. $29.02 1 2025
Source payment records
VYALEV
Normalized: vyalev
Drug ABBVIE INC. $28.36 1 2025
Source payment records
LEQEMBI
Normalized: leqembi
Drug Biogen, Inc. $27.28 1 2025
Source payment records
OCTAGAM IMMUNE GLOBULIN (HUMAN)
Normalized: octagam immune globulin human
Drug PFIZER INC. $24.72 1 2025
Source payment records
PANZYGA
Normalized: panzyga
Biological PFIZER INC. $24.72 1 2025
Source payment records
Xeomin
Normalized: xeomin
Biological Merz Pharmaceuticals, LLC $23.28 1 2025
Source payment records
EPIDIOLEX
Normalized: epidiolex
Drug JAZZ PHARMACEUTICALS INC. $20.18 1 2025
Source payment records
REXULTI
Normalized: rexulti
Drug Lundbeck LLC $15.82 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
AUSTEDO XR
austedo xr
2025 Austedo Xr 2024 19
Beneficiary count suppressed
exact normalized Medicare Part D
INBRIJA
inbrija
2025 Inbrija 2024 32
Beneficiary count suppressed
exact normalized Medicare Part D
NURTEC ODT
nurtec odt
2025 Nurtec Odt 2024 11
Beneficiary count suppressed
exact normalized Medicare Part D
QULIPTA
qulipta
2025 Qulipta 2024 22
Beneficiary count suppressed
exact normalized Medicare Part D
UBRELVY
ubrelvy
2025 Ubrelvy 2024 31
Beneficiary count suppressed
exact normalized Medicare Part D
VUMERITY
vumerity
2025 Vumerity 2024 15
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 QULIPTA
open payments reported associated product
CMS Open Payments — General Payments
298617 supporting records · 58957 recipient NPIs · example record 1201352530
Qulipta · 2024
Exact normalized brand match · 1 Part D row
22 suppressed by CMS
ABBVIE INC.
Exact reporting entity; no affiliate inference
2025 UBRELVY
open payments reported associated product
CMS Open Payments — General Payments
299803 supporting records · 61203 recipient NPIs · example record 1201352530
Ubrelvy · 2024
Exact normalized brand match · 1 Part D row
31 suppressed by CMS
Biogen, Inc.
Exact reporting entity; no affiliate inference
2025 VUMERITY
open payments reported associated product
CMS Open Payments — General Payments
16193 supporting records · 4044 recipient NPIs · example record 1208299697
Vumerity · 2024
Exact normalized brand match · 1 Part D row
15 suppressed by CMS
Merz Pharmaceuticals, LLC
Exact reporting entity; no affiliate inference
2025 INBRIJA
open payments reported associated product
CMS Open Payments — General Payments
4307 supporting records · 2211 recipient NPIs · example record 1232555387
Inbrija · 2024
Exact normalized brand match · 1 Part D row
32 suppressed by CMS
PFIZER INC.
Exact reporting entity; no affiliate inference
2025 NURTEC ODT
open payments reported associated product
CMS Open Payments — General Payments
217574 supporting records · 54025 recipient NPIs · example record 1228794063
Nurtec Odt · 2024
Exact normalized brand match · 1 Part D row
11 suppressed by CMS
Teva Pharmaceuticals USA, Inc.
Exact reporting entity; no affiliate inference
2025 AUSTEDO XR
open payments reported associated product
CMS Open Payments — General Payments
86263 supporting records · 23643 recipient NPIs · example record 1247244228
Austedo Xr · 2024
Exact normalized brand match · 1 Part D row
19 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
Donepezil HclDonepezil Hcl303121
Carbidopa-LevodopaCarbidopa/Levodopa20961
LevetiracetamLevetiracetam19654
Memantine HclMemantine Hcl18353
Citalopram HbrCitalopram Hydrobromide17360
GabapentinGabapentin14566
RizatriptanRizatriptan Benzoate11934
LamotrigineLamotrigine11335
PrimidonePrimidone11137
Ropinirole HclRopinirole Hcl9925
TopiramateTopiramate9636
Selegiline HclSelegiline Hcl8722
ClonazepamClonazepam77suppressed
Quetiapine FumarateQuetiapine Fumarate6927
BaclofenBaclofen5322
Sumatriptan SuccinateSumatriptan Succinate4913
Sodium Chloride0.9 % Sodium Chloride38suppressed
LacosamideLacosamide36suppressed
Divalproex SodiumDivalproex Sodium33suppressed
InbrijaLevodopa32suppressed
UbrelvyUbrogepant31suppressed
NeuproRotigotine28suppressed
Pramipexole DihydrochloridePramipexole Di-Hcl28suppressed
Trazodone HclTrazodone Hcl27suppressed
VimpatLacosamide26suppressed
Oxybutynin ChlorideOxybutynin Chloride25suppressed
Rasagiline MesylateRasagiline Mesylate24suppressed
ClobazamClobazam23suppressed
DiazepamDiazepam2221
QuliptaAtogepant22suppressed
Ondansetron HclOndansetron Hcl20suppressed
ZonisamideZonisamide20suppressed
Austedo XrDeutetrabenazine19suppressed
Bupropion XlBupropion Hcl19suppressed
Divalproex Sodium ErDivalproex Sodium19suppressed
PregabalinPregabalin19suppressed
RivastigmineRivastigmine19suppressed
GocovriAmantadine Hcl18suppressed
PrivigenImmun Glob G(Igg)/Pro/Iga 0-5018suppressed
Amitriptyline HclAmitriptyline Hcl17suppressed
Carbamazepine ErCarbamazepine17suppressed
Gammagard LiquidImmun Glob G(Igg)/Gly/Iga Ov5017suppressed
MirtazapineMirtazapine17suppressed
AmantadineAmantadine Hcl15suppressed
OxcarbazepineOxcarbazepine15suppressed
VumerityDiroximel Fumarate15suppressed
CarbamazepineCarbamazepine14suppressed
BanzelRufinamide13suppressed
NuplazidPimavanserin Tartrate13suppressed
Zolpidem TartrateZolpidem Tartrate13suppressed
OctagamImmun Globg(Igg)/Malt/Iga Ov5012suppressed
Propranolol HclPropranolol Hcl12suppressed
Bupropion Hcl SrBupropion Hcl11suppressed
Nurtec OdtRimegepant Sulfate11suppressed
Valproic AcidValproic Acid (As Sodium Salt)11suppressed

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 $11,261.59 · 124 records ABBVIE INC. AUSTEDO XR, BOTOX, EPIDIOLEX, FIRDAPSE, Fintepla, INBRIJA, KESIMPTA, LEQEMBI, NURTEC ODT, Nayzilam, OCTAGAM IMMUNE GLOBULIN (HUMAN), Ocrevus, Ocrevus Zunovo, PANZYGA, PNS FREEDOM-4A PERMANENT NEUROSTIMULATOR RECEIVER KIT CHANNEL A, QALSODY, QULIPTA, REXULTI, Rystiggo, SKYCLARYS, SPINRAZA, Symbravo, TYSABRI, UBRELVY, ULTOMIRIS, UPLIZNA, VUMERITY, VYALEV, VYEPTI, VYVGART HYTRULO, Xeomin, ZAVZPRET, ZEPOSIA 6
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