Healthcare provider profile · identity verified

Alexander Y Chan, M.D.

Internal Medicine · STOCKTON, CA · NPI 1386722296

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	1270	214
Levothyroxine Sodium	Levothyroxine Sodium	1162	143
Gabapentin	Gabapentin	1046	146
Furosemide	Furosemide	998	150
Potassium Chloride	Potassium Chloride	709	108
Amlodipine Besylate	Amlodipine Besylate	698	100
Eliquis	Apixaban	686	88
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	630	111
Lisinopril	Lisinopril	599	88
Carvedilol	Carvedilol	473	61
Tamsulosin Hcl	Tamsulosin Hcl	454	91
Famotidine	Famotidine	430	63
Clopidogrel	Clopidogrel Bisulfate	410	62
Metoprolol Tartrate	Metoprolol Tartrate	396	83
Pantoprazole Sodium	Pantoprazole Sodium	354	71
Lorazepam	Lorazepam	341	77
Levetiracetam	Levetiracetam	310	33
Buspirone Hcl	Buspirone Hcl	309	49
Ipratropium-Albuterol	Ipratropium/Albuterol Sulfate	294	84
Duloxetine Hcl	Duloxetine Hcl	289	34
Simvastatin	Simvastatin	288	29
Metoprolol Succinate	Metoprolol Succinate	282	54
Hydralazine Hcl	Hydralazine Hcl	275	66
Tradjenta	Linagliptin	253	20
Sertraline Hcl	Sertraline Hcl	252	32
Allopurinol	Allopurinol	245	37
Xarelto	Rivaroxaban	245	26
Losartan Potassium	Losartan Potassium	241	58
Divalproex Sodium	Divalproex Sodium	235	27
Amiodarone Hcl	Amiodarone Hcl	227	35
Metformin Hcl	Metformin Hcl	223	40
Quetiapine Fumarate	Quetiapine Fumarate	219	34
Tramadol Hcl	Tramadol Hcl	216	50
Bumetanide	Bumetanide	209	30
Mirtazapine	Mirtazapine	202	52
Donepezil Hcl	Donepezil Hcl	187	37
Spironolactone	Spironolactone	183	29
Trazodone Hcl	Trazodone Hcl	180	40
Januvia	Sitagliptin Phosphate	178	28
Jardiance	Empagliflozin	168	21
Citalopram Hbr	Citalopram Hydrobromide	165	20
Atenolol	Atenolol	145	suppressed
Latanoprost	Latanoprost	144	37
Namzaric	Memantine Hcl/Donepezil Hcl	136	suppressed
Prednisone	Prednisone	130	42
Baclofen	Baclofen	126	27
Lacosamide	Lacosamide	126	13
Enulose	Lactulose	121	16
Midodrine Hcl	Midodrine Hcl	121	26
Pravastatin Sodium	Pravastatin Sodium	120	17
Carbidopa-Levodopa	Carbidopa/Levodopa	119	15
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	117	18
Klor-Con 10	Potassium Chloride	112	21
Ropinirole Hcl	Ropinirole Hcl	109	13
Escitalopram Oxalate	Escitalopram Oxalate	106	25
Oxycodone Hcl	Oxycodone Hcl	103	29
Nystatin	Nystatin	98	49
Alprazolam	Alprazolam	97	17
Finasteride	Finasteride	97	21
Aripiprazole	Aripiprazole	96	11
Ondansetron Hcl	Ondansetron Hcl	96	49
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	94	22
Montelukast Sodium	Montelukast Sodium	93	23
Lactulose	Lactulose	92	31
Insulin Lispro Kwikpen U-100	Insulin Lispro	91	24
Ceftriaxone	Ceftriaxone Sodium	89	49
Paroxetine Hcl	Paroxetine Hcl	89	14
Omeprazole	Omeprazole	88	27
Isosorbide Mononitrate Er	Isosorbide Mononitrate	86	15
Hydrochlorothiazide	Hydrochlorothiazide	85	12
Albuterol Sulfate Hfa	Albuterol Sulfate	81	51
Levofloxacin	Levofloxacin	81	50
Clonidine Hcl	Clonidine Hcl	80	suppressed
Cephalexin	Cephalexin	78	38
Memantine Hcl	Memantine Hcl	76	21
Morphine Sulfate Er	Morphine Sulfate	75	suppressed
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	75	18
Rosuvastatin Calcium	Rosuvastatin Calcium	75	20
Trulicity	Dulaglutide	75	13
Sodium Chloride	0.9 % Sodium Chloride	74	32
Glipizide	Glipizide	72	13
Klor-Con 8	Potassium Chloride	70	suppressed
Alendronate Sodium	Alendronate Sodium	69	21
Combivent Respimat	Ipratropium/Albuterol Sulfate	68	40
Digoxin	Digoxin	66	suppressed
Oxcarbazepine	Oxcarbazepine	64	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	63	32
Doxazosin Mesylate	Doxazosin Mesylate	63	suppressed
Tolterodine Tartrate	Tolterodine Tartrate	61	suppressed
Azithromycin	Azithromycin	57	32
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	57	suppressed
Topiramate	Topiramate	57	suppressed
Autoshield Duo Pen Needle	Pen Needle,dual Safety,diabetc	55	16
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	55	11
Triamcinolone Acetonide	Triamcinolone Acetonide	54	17
Valproic Acid	Valproic Acid (As Sodium Salt)	54	suppressed
Pregabalin	Pregabalin	53	12
Risperidone	Risperidone	53	suppressed
Diclofenac Sodium	Diclofenac Sodium	52	19
Mupirocin	Mupirocin	52	32
Xifaxan	Rifaximin	52	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	52	11
Divalproex Sodium Er	Divalproex Sodium	51	suppressed
Fluticasone Propionate	Fluticasone Propionate	51	26
Nifedipine Er	Nifedipine	51	11
Methimazole	Methimazole	49	suppressed
Ranolazine Er	Ranolazine	49	suppressed
Humalog Kwikpen U-100	Insulin Lispro	48	24
Procrit	Epoetin Alfa	48	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	47	13
Lantus	Insulin Glargine,hum.Rec.Anlog	46	17
Memantine Hcl Er	Memantine Hcl	46	suppressed
Venlafaxine Hcl	Venlafaxine Hcl	46	suppressed
Chlorpromazine Hcl	Chlorpromazine Hcl	45	suppressed
Letrozole	Letrozole	45	suppressed
Linzess	Linaclotide	45	suppressed
Olanzapine	Olanzapine	45	suppressed
Doxycycline Hyclate	Doxycycline Hyclate	44	18
Morphine Sulfate	Morphine Sulfate	44	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	41	19
Methenamine Hippurate	Methenamine Hippurate	40	11
Minoxidil	Minoxidil	40	suppressed
Ramipril	Ramipril	39	suppressed
Zonisamide	Zonisamide	39	suppressed
Metoclopramide Hcl	Metoclopramide Hcl	38	16
Sps	Sodium Polystyrene Sulfon/Sorb	38	19
Brimonidine Tartrate	Brimonidine Tartrate	37	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	37	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	37	13
Ezetimibe	Ezetimibe	36	suppressed
Metronidazole	Metronidazole	36	18
Benztropine Mesylate	Benztropine Mesylate	35	suppressed
Breo Ellipta	Fluticasone/Vilanterol	35	13
Ketoconazole	Ketoconazole	35	11
Fluoxetine Hcl	Fluoxetine Hcl	34	14
Bupropion Hcl Sr	Bupropion Hcl	33	suppressed
Carbamazepine Er	Carbamazepine	33	suppressed
Glycopyrrolate	Glycopyrrolate	33	suppressed
Humalog	Insulin Lispro	33	20
Insulin Lispro	Insulin Lispro	33	14
Lamotrigine	Lamotrigine	33	suppressed
Lidocaine Hcl	Lidocaine Hcl/Pf	33	20
Incruse Ellipta	Umeclidinium Bromide	31	suppressed
Amantadine	Amantadine Hcl	29	suppressed
Glipizide Er	Glipizide	28	suppressed
Insulin Glargine-Yfgn	Insulin Glargine-Yfgn	28	14
Oxybutynin Chloride	Oxybutynin Chloride	28	suppressed
Phenytoin Sodium Extended	Phenytoin Sodium Extended	28	suppressed
Warfarin Sodium	Warfarin Sodium	28	suppressed
Acetaminophen-Codeine	Acetaminophen With Codeine	27	suppressed
Ceftriaxone	Ceftriaxone In Is-Osm Dextrose	27	18
Fluticasone-Vilanterol	Fluticasone/Vilanterol	27	suppressed
Atropine Sulfate	Atropine Sulfate	26	suppressed
Spiriva Handihaler	Tiotropium Bromide	26	suppressed
Diltiazem Hcl	Diltiazem Hcl	25	suppressed
Scopolamine	Scopolamine	25	suppressed
Carbamazepine	Carbamazepine	24	suppressed
Hydromorphone Hcl	Hydromorphone Hcl	24	suppressed
Nitroglycerin	Nitroglycerin	24	19
Fluconazole	Fluconazole	23	11
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	23	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	22	suppressed
Gemfibrozil	Gemfibrozil	22	suppressed
Insulin Aspart Flexpen	Insulin Aspart	22	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	22	suppressed
Benazepril Hcl	Benazepril Hcl	21	suppressed
Butalbital-Aspirin-Caffeine	Butalbital/Aspirin/Caffeine	21	suppressed
Dorzolamide Hcl	Dorzolamide Hcl	21	suppressed
Folic Acid	Folic Acid	21	suppressed
Methadone Hcl	Methadone Hcl	21	suppressed
Carbidopa-Levodopa Er	Carbidopa/Levodopa	20	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	20	suppressed
Myrbetriq	Mirabegron	20	suppressed
Wixela Inhub	Fluticasone Propion/Salmeterol	20	suppressed
Meclizine Hcl	Meclizine Hcl	19	suppressed
Novolog	Insulin Aspart	19	suppressed
Albuterol Sulfate	Albuterol Sulfate	18	suppressed
Clonazepam	Clonazepam	18	suppressed
Daptomycin	Daptomycin	18	suppressed
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	18	14
Hydroxychloroquine Sulfate	Hydroxychloroquine Sulfate	18	suppressed
Lansoprazole	Lansoprazole	18	suppressed
Belsomra	Suvorexant	17	suppressed
Bicalutamide	Bicalutamide	17	suppressed
Enoxaparin Sodium	Enoxaparin Sodium	17	11
Erythromycin	Erythromycin Base	17	suppressed
Fenofibrate	Fenofibrate Nanocrystallized	17	suppressed
Vancomycin Hcl	Vancomycin/Water For Inj (Peg)	17	suppressed
Fludrocortisone Acetate	Fludrocortisone Acetate	16	suppressed
Ibuprofen	Ibuprofen	16	suppressed
Permethrin	Permethrin	16	suppressed
Pradaxa	Dabigatran Etexilate Mesylate	16	suppressed
Valproic Acid	Valproic Acid	16	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	15	suppressed
Chlorhexidine Gluconate	Chlorhexidine Gluconate	15	suppressed
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	15	suppressed
Farxiga	Dapagliflozin Propanediol	15	11
Hydrocortisone	Hydrocortisone	15	suppressed
Ipratropium Bromide	Ipratropium Bromide	15	suppressed
Lurasidone Hcl	Lurasidone Hcl	15	suppressed
Ondansetron Odt	Ondansetron	15	11
Temazepam	Temazepam	15	suppressed
Zenpep	Lipase/Protease/Amylase	15	suppressed
Brilinta	Ticagrelor	14	suppressed
Dapagliflozin	Dapagliflozin Propanediol	14	suppressed
Enalapril Maleate	Enalapril Maleate	14	suppressed
Mesalamine	Mesalamine	14	suppressed
Metolazone	Metolazone	14	suppressed
Nystop	Nystatin	14	13
Silver Sulfadiazine	Silver Sulfadiazine	14	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	14	suppressed
Ertapenem	Ertapenem Sodium	13	suppressed
Formoterol Fumarate	Formoterol Fumarate	13	suppressed
Leflunomide	Leflunomide	13	suppressed
Lidocaine Hcl	Lidocaine Hcl	13	12
Novolog Flexpen	Insulin Aspart	13	suppressed
Nuplazid	Pimavanserin Tartrate	13	suppressed
Sodium Chloride	Sodium Chloride 0.45 %	13	suppressed
Tolterodine Tartrate Er	Tolterodine Tartrate	13	suppressed
Trihexyphenidyl Hcl	Trihexyphenidyl Hcl	13	suppressed
Arnuity Ellipta	Fluticasone Furoate	12	suppressed
Clotrimazole	Clotrimazole	12	suppressed
Demeclocycline Hcl	Demeclocycline Hcl	12	suppressed
Glimepiride	Glimepiride	12	suppressed
Omega-3 Acid Ethyl Esters	Omega-3 Acid Ethyl Esters	12	suppressed
Timolol Maleate	Timolol Maleate	12	suppressed
Tizanidine Hcl	Tizanidine Hcl	12	suppressed
Tresiba Flextouch U-100	Insulin Degludec	12	suppressed
Vancomycin Hcl	Vancomycin Hcl	12	suppressed
Ventolin Hfa	Albuterol Sulfate	12	suppressed
Acetazolamide	Acetazolamide	11	suppressed
Anastrozole	Anastrozole	11	suppressed
Doxepin Hcl	Doxepin Hcl	11	suppressed
Ingrezza	Valbenazine Tosylate	11	suppressed
Invega Sustenna	Paliperidone Palmitate	11	suppressed
Irbesartan	Irbesartan	11	suppressed
Jantoven	Warfarin Sodium	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