Healthcare provider profile · identity verified

Gary P Fontan, MD

Family Practice · CHINO HILLS, CA · NPI 1760482731

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	391	149
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	314	54
Losartan Potassium	Losartan Potassium	277	108
Levothyroxine Sodium	Levothyroxine Sodium	218	75
Amlodipine Besylate	Amlodipine Besylate	206	88
Lisinopril	Lisinopril	179	69
Metformin Hcl Er	Metformin Hcl	156	63
Rosuvastatin Calcium	Rosuvastatin Calcium	155	59
Albuterol Sulfate Hfa	Albuterol Sulfate	145	56
Omeprazole	Omeprazole	142	64
Ibuprofen	Ibuprofen	141	63
Hydrochlorothiazide	Hydrochlorothiazide	134	53
Atenolol	Atenolol	124	44
Trazodone Hcl	Trazodone Hcl	121	48
Furosemide	Furosemide	116	54
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	113	15
Tamsulosin Hcl	Tamsulosin Hcl	106	40
Lorazepam	Lorazepam	105	27
Pantoprazole Sodium	Pantoprazole Sodium	100	38
Simvastatin	Simvastatin	96	36
Metformin Hcl	Metformin Hcl	94	38
Metoprolol Tartrate	Metoprolol Tartrate	94	34
Terazosin Hcl	Terazosin Hcl	88	32
Alendronate Sodium	Alendronate Sodium	86	31
Pradaxa	Dabigatran Etexilate Mesylate	85	26
Potassium Chloride	Potassium Chloride	83	36
Glipizide	Glipizide	79	37
Gabapentin	Gabapentin	78	36
Acetaminophen-Codeine	Acetaminophen With Codeine	73	24
Meloxicam	Meloxicam	73	28
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	72	27
Alprazolam	Alprazolam	70	15
Ozempic	Semaglutide	64	13
Sertraline Hcl	Sertraline Hcl	64	27
Prednisone	Prednisone	58	25
Triamcinolone Acetonide	Triamcinolone Acetonide	58	32
Morphine Sulfate Er	Morphine Sulfate	56	suppressed
Carvedilol	Carvedilol	53	18
Ezetimibe	Ezetimibe	48	20
Hydroxyzine Hcl	Hydroxyzine Hcl	48	suppressed
Baclofen	Baclofen	44	17
Hydralazine Hcl	Hydralazine Hcl	42	18
Ondansetron Odt	Ondansetron	41	13
Spironolactone	Spironolactone	41	16
Humulin N	Insulin Nph Human Isophane	36	12
Bisoprolol Fumarate	Bisoprolol Fumarate	35	15
Famotidine	Famotidine	34	18
Hydrocortisone	Hydrocortisone	33	21
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	33	27
Fluticasone Propionate	Fluticasone Propionate	32	17
Jardiance	Empagliflozin	32	11
Valacyclovir	Valacyclovir Hcl	32	11
Wixela Inhub	Fluticasone Propion/Salmeterol	32	13
Buspirone Hcl	Buspirone Hcl	31	suppressed
Tramadol Hcl	Tramadol Hcl	31	suppressed
Allopurinol	Allopurinol	30	suppressed
Clopidogrel	Clopidogrel Bisulfate	30	15
Duloxetine Hcl	Duloxetine Hcl	30	13
Fluoxetine Hcl	Fluoxetine Hcl	30	11
Finasteride	Finasteride	29	suppressed
Lactulose	Lactulose	29	suppressed
Nitroglycerin	Nitroglycerin	29	17
Azithromycin	Azithromycin	28	22
Diphenoxylate-Atropine	Diphenoxylate Hcl/Atropine	28	suppressed
Naproxen	Naproxen	28	11
Arexvy	Rsvpref3 Antigen/As01e/Pf	26	26
Temazepam	Temazepam	26	suppressed
Adacel Tdap	Diph,pertuss(Acell),tet Vac/Pf	25	25
Terbinafine Hcl	Terbinafine Hcl	25	17
Venlafaxine Hcl Er	Venlafaxine Hcl	25	suppressed
Methocarbamol	Methocarbamol	24	12
Montelukast Sodium	Montelukast Sodium	24	12
Veo Insulin Syringe	Syringe-Needle,insulin,0.5 Ml	23	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	21	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	20	16
Oxybutynin Chloride Er	Oxybutynin Chloride	20	suppressed
Primidone	Primidone	20	suppressed
Warfarin Sodium	Warfarin Sodium	20	suppressed
Cephalexin	Cephalexin	19	14
Colchicine	Colchicine	19	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	19	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	19	suppressed
Retin-A	Tretinoin	19	suppressed
Veo Insulin Syringe	Syringe And Needle,insulin,1ml	19	suppressed
Citalopram Hbr	Citalopram Hydrobromide	18	suppressed
Humulin R	Insulin Regular, Human	18	suppressed
Benazepril Hcl	Benazepril Hcl	17	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	17	suppressed
Rizatriptan	Rizatriptan Benzoate	17	suppressed
Amoxicillin	Amoxicillin	16	12
Azelastine Hcl	Azelastine Hcl	16	suppressed
Clonazepam	Clonazepam	16	suppressed
Latanoprost	Latanoprost	16	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	16	suppressed
Tizanidine Hcl	Tizanidine Hcl	16	suppressed
Eliquis	Apixaban	15	suppressed
Fluconazole	Fluconazole	15	suppressed
Methenamine Hippurate	Methenamine Hippurate	15	suppressed
Pregabalin	Pregabalin	15	suppressed
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	15	suppressed
Fenofibrate	Fenofibrate	14	suppressed
Lidocaine	Lidocaine	14	suppressed
Morphine Sulfate	Morphine Sulfate	14	suppressed
Oxycodone Hcl	Oxycodone Hcl	14	suppressed
Buprenorphine-Naloxone	Buprenorphine Hcl/Naloxone Hcl	13	suppressed
Chlorhexidine Gluconate	Chlorhexidine Gluconate	13	suppressed
Estradiol	Estradiol	13	suppressed
Humalog	Insulin Lispro	13	suppressed
Metoprolol Succinate	Metoprolol Succinate	13	suppressed
Repatha Sureclick	Evolocumab	13	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	13	suppressed
Torsemide	Torsemide	13	suppressed
Humulin 70-30	Insulin Nph Hum/Reg Insulin Hm	12	suppressed
Insulin Glargine-Yfgn	Insulin Glargine-Yfgn	12	suppressed
Neomycin-Polymyxin-Dexameth	Neomycin/Polymyxin B/Dexametha	12	suppressed
Nystatin	Nystatin	12	suppressed
Trospium Chloride	Trospium Chloride	12	suppressed
Alvesco	Ciclesonide	11	suppressed
Bupropion Xl	Bupropion Hcl	11	suppressed
Clobetasol Propionate	Clobetasol Propionate	11	suppressed
Doxycycline Monohydrate	Doxycycline Monohydrate	11	suppressed
Lovastatin	Lovastatin	11	suppressed
Naloxone Hcl	Naloxone Hcl	11	11
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	11	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	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

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