Healthcare provider profile · identity verified

Eric Khau, MD

Internal Medicine · TUSTIN, CA · NPI 1437654134

Profile state: partd only 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

We did not find matching Open Payments records for this doctor in 2025.

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

Payment overview · 2025

General Payments

We did not find matching Open Payments records for this doctor in the selected program year.

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.

Analysis 1 · Payment-linked products

Products named in Open Payments records

No payment-linked product analysis is available because no matching General Payment records were found for the selected year.

Public prescribing for products named in payments

There is no explicit payment-product set available for a Part D comparison.

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.

There is no payer-company set available for this comparison.

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

Brand	Generic	Claims	Beneficiaries
Atorvastatin Calcium	Atorvastatin Calcium	271	98
Levothyroxine Sodium	Levothyroxine Sodium	231	65
Losartan Potassium	Losartan Potassium	210	73
Amlodipine Besylate	Amlodipine Besylate	205	68
Rosuvastatin Calcium	Rosuvastatin Calcium	188	72
Lisinopril	Lisinopril	174	52
Metformin Hcl	Metformin Hcl	158	54
Tamsulosin Hcl	Tamsulosin Hcl	130	49
Omeprazole	Omeprazole	108	40
Simvastatin	Simvastatin	92	26
Hydrochlorothiazide	Hydrochlorothiazide	81	28
Pravastatin Sodium	Pravastatin Sodium	80	27
Alendronate Sodium	Alendronate Sodium	71	19
Metoprolol Succinate	Metoprolol Succinate	69	24
Escitalopram Oxalate	Escitalopram Oxalate	62	21
Zolpidem Tartrate	Zolpidem Tartrate	62	17
Allopurinol	Allopurinol	60	17
Fluticasone Propionate	Fluticasone Propionate	53	29
Gabapentin	Gabapentin	53	22
Pantoprazole Sodium	Pantoprazole Sodium	51	21
Ezetimibe	Ezetimibe	50	18
Temazepam	Temazepam	50	suppressed
Valsartan	Valsartan	46	17
Finasteride	Finasteride	42	15
Atenolol	Atenolol	40	13
Alprazolam	Alprazolam	38	12
Metformin Hcl Er	Metformin Hcl	38	17
Carvedilol	Carvedilol	37	12
Meloxicam	Meloxicam	36	17
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	35	12
Clopidogrel	Clopidogrel Bisulfate	34	suppressed
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	34	15
Duloxetine Hcl	Duloxetine Hcl	32	suppressed
Montelukast Sodium	Montelukast Sodium	31	11
Mounjaro	Tirzepatide	31	suppressed
Sertraline Hcl	Sertraline Hcl	30	suppressed
Trazodone Hcl	Trazodone Hcl	30	11
Benazepril Hcl	Benazepril Hcl	29	suppressed
Furosemide	Furosemide	29	13
Ipratropium Bromide	Ipratropium Bromide	28	suppressed
Jardiance	Empagliflozin	28	11
Metoprolol Tartrate	Metoprolol Tartrate	28	suppressed
Methocarbamol	Methocarbamol	25	suppressed
Lovastatin	Lovastatin	23	suppressed
Azithromycin	Azithromycin	22	22
Glipizide	Glipizide	21	suppressed
Synthroid	Levothyroxine Sodium	21	suppressed
Tramadol Hcl	Tramadol Hcl	21	suppressed
Ozempic	Semaglutide	20	suppressed
Donepezil Hcl	Donepezil Hcl	19	suppressed
Famotidine	Famotidine	19	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	19	suppressed
Olmesartan Medoxomil	Olmesartan Medoxomil	19	suppressed
Wixela Inhub	Fluticasone Propion/Salmeterol	19	suppressed
Albuterol Sulfate Hfa	Albuterol Sulfate	18	suppressed
Bupropion Xl	Bupropion Hcl	18	suppressed
Eliquis	Apixaban	18	suppressed
Potassium Chloride	Potassium Chloride	18	suppressed
Spironolactone	Spironolactone	18	suppressed
Fenofibrate	Fenofibrate Nanocrystallized	17	suppressed
Janumet Xr	Sitagliptin Phos/Metformin Hcl	17	suppressed
Glipizide Er	Glipizide	16	suppressed
Irbesartan	Irbesartan	16	suppressed
Terazosin Hcl	Terazosin Hcl	16	suppressed
Valacyclovir	Valacyclovir Hcl	16	suppressed
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	16	suppressed
Diclofenac Sodium	Diclofenac Sodium	15	suppressed
Ibuprofen	Ibuprofen	15	suppressed
Mirtazapine	Mirtazapine	15	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	15	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	15	12
Pregabalin	Pregabalin	14	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	13	suppressed
Breo Ellipta	Fluticasone/Vilanterol	13	suppressed
Chlorthalidone	Chlorthalidone	13	suppressed
Estradiol	Estradiol	13	suppressed
Januvia	Sitagliptin Phosphate	13	suppressed
Ketoconazole	Ketoconazole	13	suppressed
Naproxen	Naproxen	13	suppressed
Paxlovid	Nirmatrelvir/Ritonavir	13	13
Ropinirole Hcl	Ropinirole Hcl	13	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	12	12
Clonazepam	Clonazepam	11	suppressed
Humalog Kwikpen U-100	Insulin Lispro	11	suppressed
Hydralazine Hcl	Hydralazine Hcl	11	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	11	suppressed
Trulicity	Dulaglutide	11	suppressed

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.

Year	General Payments	Main payer	Explicit products	Company overlaps	Part D coverage
2025	—	—	—	—	—
2024	—	—	—	—	Complete

Questions to ask

Questions you could discuss with your doctor

Are there reasonable alternatives I should understand when we discuss treatment options?
How should I interpret the industry-payment records shown here in the context of my care?

These are general questions generated from reviewed templates. They are not personalized medical advice.

Sources and limitations

How to read this page

Payment and Medicare prescribing data can cover different years; every comparison shows both years explicitly.
Part D does not represent a doctor’s entire practice; it excludes many patients and is subject to CMS public-release thresholds.
Company–drug relationships must have an auditable source, a precise relationship type, and a valid evidence period. Unresolved mappings are not published.
Generic drug claims are not attributed to a specific manufacturer without manufacturer-level evidence.
When a source extract is incomplete, missing rows are never treated as proof of no payments or no prescriptions.

Loaded source releases

Dataset	Year	Publication	Source
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