Healthcare provider profile · identity verified

William L. Guy, PH.D., M.D.

Allopathic & Osteopathic Physicians|Psychiatry & Neurology|Psychiatry · SOUTHFIELD, MI · NPI 1295748101

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 L. Guy, PH.D., M.D. received $169,193.76 in general payments during 2025 across 206 reported records.

ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) accounted for 71.6% of that reported general-payment amount.

The Open Payments records used for this analysis explicitly named 9 associated products.

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

Otsuka America Pharmaceutical, 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 REXULTI as an associated drug or biological on 160756 records involving 46288 distinct recipient NPIs. Public Medicare Part D data also shows 14 claims for Rexulti by this doctor in 2024.

Vanda 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 FANAPT as an associated drug or biological on 95605 records involving 21383 distinct recipient NPIs. Public Medicare Part D data also shows 12 claims for Fanapt by this doctor in 2024.

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

Payment overview · 2025

General Payments

$169,193.76

206 reported records · 7 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 $121,153.5571.6%1542025
Teva Pharmaceuticals USA, Inc. Unresolved — no canonical attribution shown $18,968.1311.2%122025
Axsome Therapeutics, Inc. Unresolved — no canonical attribution shown $14,910.478.8%182025
Otsuka America Pharmaceutical, Inc. Unresolved — no canonical attribution shown $8,003.844.7%142025
Vanda Pharmaceuticals Inc. Unresolved — no canonical attribution shown $6,106.283.6%62025
Alkermes, Inc. Unresolved — no canonical attribution shown $28.330.0%12025
E.R. Squibb & Sons, L.L.C. Unresolved — no canonical attribution shown $23.160.0%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$129,013.0041
Travel and Lodging$20,370.8096
Honoraria$11,800.005
Consulting Fee$4,080.002
Food and Beverage$3,922.4561
Education$7.511

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.) $121,153.55 154 2025
Source payment records
AUSTEDO XR
Normalized: austedo xr
Drug Teva Pharmaceuticals USA, Inc. $18,968.13 12 2025
Source payment records
Auvelity
Normalized: auvelity
Drug Axsome Therapeutics, Inc. $14,910.47 18 2025
Source payment records
REXULTI
Normalized: rexulti
Drug Otsuka America Pharmaceutical, Inc. $7,996.33 13 2025
Source payment records
FANAPT
Normalized: fanapt
Drug Vanda Pharmaceuticals Inc. $6,106.28 6 2025
Source payment records
ARISTADA
Normalized: aristada
Drug Alkermes, Inc. $28.33 1 2025
Source payment records
LYBALVI
Normalized: lybalvi
Drug Alkermes, Inc. $28.33 1 2025
Source payment records
COBENFY
Normalized: cobenfy
Drug E.R. Squibb & Sons, L.L.C. $23.16 1 2025
Source payment records
ABILIFY MAINTENA
Normalized: abilify maintena
Drug Otsuka America Pharmaceutical, Inc. $7.51 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
FANAPT
fanapt
2025 Fanapt 2024 12
Beneficiary count suppressed
exact normalized Medicare Part D
REXULTI
rexulti
2025 Rexulti 2024 14
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
Otsuka America Pharmaceutical, Inc.
Exact reporting entity; no affiliate inference
2025 REXULTI
open payments reported associated product
CMS Open Payments — General Payments
160756 supporting records · 46288 recipient NPIs · example record 1227267708
Rexulti · 2024
Exact normalized brand match · 1 Part D row
14 suppressed by CMS
Vanda Pharmaceuticals Inc.
Exact reporting entity; no affiliate inference
2025 FANAPT
open payments reported associated product
CMS Open Payments — General Payments
95605 supporting records · 21383 recipient NPIs · example record 1232940535
Fanapt · 2024
Exact normalized brand match · 1 Part D row
12 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
Quetiapine FumarateQuetiapine Fumarate12025
GabapentinGabapentin9424
Bupropion XlBupropion Hcl7311
LamotrigineLamotrigine5712
AlprazolamAlprazolam5614
ClonazepamClonazepam54suppressed
Trazodone HclTrazodone Hcl4814
Duloxetine HclDuloxetine Hcl4511
Vilazodone HclVilazodone Hcl45suppressed
Lurasidone HclLurasidone Hcl44suppressed
PregabalinPregabalin4412
Dextroamphetamine-Amphet ErDextroamphetamine/Amphetamine43suppressed
Sertraline HclSertraline Hcl35suppressed
EszopicloneEszopiclone33suppressed
Quetiapine Fumarate ErQuetiapine Fumarate33suppressed
Ziprasidone HclZiprasidone Hcl31suppressed
Dextroamphetamine-AmphetamineDextroamphetamine/Amphetamine28suppressed
Venlafaxine Hcl ErVenlafaxine Hcl27suppressed
Bupropion Hcl SrBupropion Hcl26suppressed
Fluvoxamine MaleateFluvoxamine Maleate26suppressed
Hydroxyzine HclHydroxyzine Hcl26suppressed
Methylphenidate HclMethylphenidate Hcl23suppressed
Desvenlafaxine Succinate ErDesvenlafaxine Succinate22suppressed
OlanzapineOlanzapine21suppressed
Methylphenidate ErMethylphenidate Hcl20suppressed
Buspirone HclBuspirone Hcl19suppressed
Divalproex Sodium ErDivalproex Sodium19suppressed
Escitalopram OxalateEscitalopram Oxalate18suppressed
Zolpidem TartrateZolpidem Tartrate17suppressed
AripiprazoleAripiprazole16suppressed
Benztropine MesylateBenztropine Mesylate16suppressed
Donepezil HclDonepezil Hcl15suppressed
Propranolol HclPropranolol Hcl15suppressed
RexultiBrexpiprazole14suppressed
Citalopram HbrCitalopram Hydrobromide12suppressed
FanaptIloperidone12suppressed
Fluphenazine HclFluphenazine Hcl12suppressed
Paliperidone ErPaliperidone12suppressed
ConcertaMethylphenidate Hcl11suppressed
Prazosin HclPrazosin 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 $169,193.76 · 206 records ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) ABILIFY MAINTENA, ARISTADA, AUSTEDO XR, Auvelity, CAPLYTA, COBENFY, FANAPT, LYBALVI, REXULTI 2
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