Healthcare provider profile · identity verified

Brian Leish, M.D.

Family Practice · LAGUNA HILLS, CA · NPI 1417087073

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	460	152
Amlodipine Besylate	Amlodipine Besylate	376	105
Levothyroxine Sodium	Levothyroxine Sodium	282	87
Simvastatin	Simvastatin	190	56
Lisinopril	Lisinopril	188	58
Gabapentin	Gabapentin	186	56
Metformin Hcl	Metformin Hcl	176	52
Alprazolam	Alprazolam	172	45
Losartan Potassium	Losartan Potassium	165	51
Tamsulosin Hcl	Tamsulosin Hcl	163	52
Hydrochlorothiazide	Hydrochlorothiazide	140	39
Prednisone	Prednisone	131	80
Albuterol Sulfate Hfa	Albuterol Sulfate	130	56
Omeprazole	Omeprazole	125	42
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	109	33
Azithromycin	Azithromycin	108	89
Finasteride	Finasteride	105	31
Zolpidem Tartrate	Zolpidem Tartrate	105	32
Donepezil Hcl	Donepezil Hcl	104	23
Rosuvastatin Calcium	Rosuvastatin Calcium	104	36
Furosemide	Furosemide	93	32
Metoprolol Tartrate	Metoprolol Tartrate	86	21
Ciprofloxacin Hcl	Ciprofloxacin Hcl	84	65
Allopurinol	Allopurinol	83	27
Metoprolol Succinate	Metoprolol Succinate	83	26
Januvia	Sitagliptin Phosphate	81	23
Duloxetine Hcl	Duloxetine Hcl	79	20
Pantoprazole Sodium	Pantoprazole Sodium	79	26
Fluticasone Propionate	Fluticasone Propionate	76	29
Lorazepam	Lorazepam	76	16
Alendronate Sodium	Alendronate Sodium	73	23
Memantine Hcl	Memantine Hcl	71	16
Temazepam	Temazepam	70	12
Trazodone Hcl	Trazodone Hcl	65	25
Clopidogrel	Clopidogrel Bisulfate	64	22
Potassium Chloride	Potassium Chloride	62	14
Escitalopram Oxalate	Escitalopram Oxalate	61	18
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	58	37
Tramadol Hcl	Tramadol Hcl	58	23
Triamcinolone Acetonide	Triamcinolone Acetonide	56	36
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	49	33
Cephalexin	Cephalexin	46	35
Methocarbamol	Methocarbamol	46	14
Doxycycline Hyclate	Doxycycline Hyclate	44	29
Atenolol	Atenolol	43	13
Azelastine Hcl	Azelastine Hcl	41	11
Meloxicam	Meloxicam	40	12
Clonazepam	Clonazepam	39	12
Glipizide	Glipizide	39	13
Synthroid	Levothyroxine Sodium	39	15
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	38	suppressed
Montelukast Sodium	Montelukast Sodium	37	14
Bupropion Xl	Bupropion Hcl	36	suppressed
Paxlovid	Nirmatrelvir/Ritonavir	35	35
Pravastatin Sodium	Pravastatin Sodium	35	11
Citalopram Hbr	Citalopram Hydrobromide	34	11
Metformin Hcl Er	Metformin Hcl	34	12
Eszopiclone	Eszopiclone	33	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	33	suppressed
Levofloxacin	Levofloxacin	32	25
Carvedilol	Carvedilol	31	suppressed
Eliquis	Apixaban	31	suppressed
Valsartan	Valsartan	31	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	28	suppressed
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	27	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	27	suppressed
Warfarin Sodium	Warfarin Sodium	27	suppressed
Valacyclovir	Valacyclovir Hcl	26	13
Wixela Inhub	Fluticasone Propion/Salmeterol	26	suppressed
Benazepril Hcl	Benazepril Hcl	25	suppressed
Mirtazapine	Mirtazapine	25	suppressed
Ozempic	Semaglutide	25	suppressed
Sertraline Hcl	Sertraline Hcl	25	suppressed
Diazepam	Diazepam	24	suppressed
Meclizine Hcl	Meclizine Hcl	24	19
Celecoxib	Celecoxib	23	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	23	suppressed
Buspirone Hcl	Buspirone Hcl	22	suppressed
Carisoprodol	Carisoprodol	22	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	22	suppressed
Lovastatin	Lovastatin	22	suppressed
Ondansetron Hcl	Ondansetron Hcl	22	15
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	21	suppressed
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	21	suppressed
Acyclovir	Acyclovir	20	suppressed
Ibuprofen	Ibuprofen	20	suppressed
Oxycodone Hcl	Oxycodone Hcl	20	suppressed
Acetaminophen-Codeine	Acetaminophen With Codeine	19	suppressed
Hydrocortisone	Hydrocortisone	19	suppressed
Jardiance	Empagliflozin	19	suppressed
Olmesartan Medoxomil	Olmesartan Medoxomil	19	suppressed
Spironolactone	Spironolactone	19	suppressed
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	19	suppressed
Zolpidem Tartrate Er	Zolpidem Tartrate	19	suppressed
Clonidine Hcl	Clonidine Hcl	18	suppressed
Ketoconazole	Ketoconazole	18	13
Ramipril	Ramipril	18	suppressed
Ventolin Hfa	Albuterol Sulfate	18	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	17	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	17	suppressed
Glipizide Er	Glipizide	16	suppressed
Topiramate	Topiramate	16	suppressed
Trulicity	Dulaglutide	16	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	15	14
Famotidine	Famotidine	15	suppressed
Premarin	Estrogens, Conjugated	15	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	15	suppressed
Butalbital-Acetaminophen-Caffe	Butalb/Acetaminophen/Caffeine	14	suppressed
Carbidopa-Levodopa	Carbidopa/Levodopa	14	suppressed
Divalproex Sodium	Divalproex Sodium	14	suppressed
Dutasteride	Dutasteride	14	suppressed
Pregabalin	Pregabalin	13	suppressed
Janumet Xr	Sitagliptin Phos/Metformin Hcl	12	suppressed
Mupirocin	Mupirocin	12	suppressed
Breo Ellipta	Fluticasone/Vilanterol	11	suppressed
Brilinta	Ticagrelor	11	suppressed
Gemtesa	Vibegron	11	suppressed
Hydralazine Hcl	Hydralazine Hcl	11	suppressed
Methylprednisolone	Methylprednisolone	11	suppressed
Nifedipine Er	Nifedipine	11	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	11	suppressed
Sildenafil Citrate	Sildenafil Citrate	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