Healthcare provider profile · identity verified

Calvin K Lei, MD

Internal Medicine · PLEASANTON, CA · NPI 1265432967

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	349	135
Amlodipine Besylate	Amlodipine Besylate	241	92
Losartan Potassium	Losartan Potassium	216	83
Zolpidem Tartrate	Zolpidem Tartrate	188	43
Levothyroxine Sodium	Levothyroxine Sodium	182	71
Alprazolam	Alprazolam	152	32
Lisinopril	Lisinopril	126	50
Metoprolol Succinate	Metoprolol Succinate	123	46
Albuterol Sulfate Hfa	Albuterol Sulfate	122	44
Tamsulosin Hcl	Tamsulosin Hcl	105	43
Gabapentin	Gabapentin	101	31
Rosuvastatin Calcium	Rosuvastatin Calcium	100	38
Pantoprazole Sodium	Pantoprazole Sodium	98	38
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	93	28
Metformin Hcl Er	Metformin Hcl	91	33
Omeprazole	Omeprazole	88	36
Simvastatin	Simvastatin	87	29
Alendronate Sodium	Alendronate Sodium	82	30
Furosemide	Furosemide	82	27
Azithromycin	Azithromycin	77	68
Metformin Hcl	Metformin Hcl	75	32
Tramadol Hcl	Tramadol Hcl	74	19
Hydrochlorothiazide	Hydrochlorothiazide	72	28
Eliquis	Apixaban	70	19
Potassium Chloride	Potassium Chloride	63	23
Montelukast Sodium	Montelukast Sodium	57	21
Lorazepam	Lorazepam	55	15
Atenolol	Atenolol	51	14
Escitalopram Oxalate	Escitalopram Oxalate	51	22
Allopurinol	Allopurinol	50	19
Trazodone Hcl	Trazodone Hcl	50	15
Fluticasone Propionate	Fluticasone Propionate	48	21
Doxycycline Hyclate	Doxycycline Hyclate	45	39
Finasteride	Finasteride	44	12
Pravastatin Sodium	Pravastatin Sodium	42	16
Methylprednisolone	Methylprednisolone	40	33
Olmesartan Medoxomil	Olmesartan Medoxomil	40	13
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	40	suppressed
Jardiance	Empagliflozin	39	14
Glipizide	Glipizide	36	13
Clonazepam	Clonazepam	34	suppressed
Prednisone	Prednisone	34	24
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	33	suppressed
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	33	suppressed
Xarelto	Rivaroxaban	33	suppressed
Synthroid	Levothyroxine Sodium	32	11
Pregabalin	Pregabalin	31	suppressed
Januvia	Sitagliptin Phosphate	30	11
Paxlovid	Nirmatrelvir/Ritonavir	30	30
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	28	21
Breo Ellipta	Fluticasone/Vilanterol	28	suppressed
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	28	suppressed
Terbinafine Hcl	Terbinafine Hcl	28	12
Mirtazapine	Mirtazapine	27	suppressed
Citalopram Hbr	Citalopram Hydrobromide	26	suppressed
Azelastine Hcl	Azelastine Hcl	25	18
Benazepril Hcl	Benazepril Hcl	25	suppressed
Celecoxib	Celecoxib	25	suppressed
Famotidine	Famotidine	24	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	24	14
Warfarin Sodium	Warfarin Sodium	24	suppressed
Donepezil Hcl	Donepezil Hcl	23	suppressed
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	23	suppressed
Ventolin Hfa	Albuterol Sulfate	23	suppressed
Glimepiride	Glimepiride	22	suppressed
Ibuprofen	Ibuprofen	22	11
Cephalexin	Cephalexin	21	18
Valsartan	Valsartan	21	suppressed
Ondansetron Odt	Ondansetron	20	14
Wixela Inhub	Fluticasone Propion/Salmeterol	20	suppressed
Duloxetine Hcl	Duloxetine Hcl	19	suppressed
Lovastatin	Lovastatin	19	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	19	suppressed
Carvedilol	Carvedilol	18	suppressed
Clotrimazole-Betamethasone	Clotrimazole/Betamethasone Dip	18	13
Lamotrigine	Lamotrigine	18	suppressed
Memantine Hcl	Memantine Hcl	18	suppressed
Solifenacin Succinate	Solifenacin Succinate	18	suppressed
Ezetimibe	Ezetimibe	17	suppressed
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	17	suppressed
Tizanidine Hcl	Tizanidine Hcl	17	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	16	14
Meloxicam	Meloxicam	16	suppressed
Mupirocin	Mupirocin	16	suppressed
Temazepam	Temazepam	16	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	15	suppressed
Buspirone Hcl	Buspirone Hcl	14	suppressed
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	14	suppressed
Diclofenac Sodium	Diclofenac Sodium	14	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	14	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	14	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	14	suppressed
Metoprolol Tartrate	Metoprolol Tartrate	14	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	14	suppressed
Verapamil Er	Verapamil Hcl	14	suppressed
Chlorthalidone	Chlorthalidone	13	suppressed
Dutasteride	Dutasteride	13	suppressed
Eszopiclone	Eszopiclone	13	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	13	suppressed
Gemfibrozil	Gemfibrozil	13	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	13	suppressed
Oxycontin	Oxycodone Hcl	13	suppressed
Ozempic	Semaglutide	13	suppressed
Paroxetine Hcl	Paroxetine Hcl	13	suppressed
Trospium Chloride	Trospium Chloride	13	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	13	suppressed
Clonidine Hcl	Clonidine Hcl	12	suppressed
Colchicine	Colchicine	12	suppressed
Glipizide Er	Glipizide	12	suppressed
Rayaldee	Calcifediol	12	suppressed
Sertraline Hcl	Sertraline Hcl	12	suppressed
Alfuzosin Hcl Er	Alfuzosin Hcl	11	suppressed
Bupropion Xl	Bupropion Hcl	11	suppressed
Febuxostat	Febuxostat	11	suppressed
Ipratropium Bromide	Ipratropium Bromide	11	suppressed
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	11	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	11	suppressed
Symbicort	Budesonide/Formoterol Fumarate	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