Healthcare provider profile · identity verified

Alexander King Chen, M.D.

Internal Medicine · WOODLAND, CA · NPI 1164537858

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	1186	267
Levothyroxine Sodium	Levothyroxine Sodium	793	163
Losartan Potassium	Losartan Potassium	771	201
Amlodipine Besylate	Amlodipine Besylate	713	188
Lisinopril	Lisinopril	682	157
Gabapentin	Gabapentin	586	119
Metoprolol Succinate	Metoprolol Succinate	532	138
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	500	87
Omeprazole	Omeprazole	478	97
Xarelto	Rivaroxaban	372	57
Tamsulosin Hcl	Tamsulosin Hcl	361	85
Simvastatin	Simvastatin	351	85
Furosemide	Furosemide	322	75
Metformin Hcl Er	Metformin Hcl	285	74
Trazodone Hcl	Trazodone Hcl	283	64
Pantoprazole Sodium	Pantoprazole Sodium	276	72
Metformin Hcl	Metformin Hcl	263	72
Hydrochlorothiazide	Hydrochlorothiazide	258	66
Sertraline Hcl	Sertraline Hcl	251	49
Albuterol Sulfate Hfa	Albuterol Sulfate	246	79
Spironolactone	Spironolactone	240	50
Famotidine	Famotidine	238	57
Pravastatin Sodium	Pravastatin Sodium	238	53
Carvedilol	Carvedilol	221	52
Finasteride	Finasteride	220	51
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	211	53
Duloxetine Hcl	Duloxetine Hcl	204	38
Eliquis	Apixaban	203	39
Mirtazapine	Mirtazapine	193	47
Tramadol Hcl	Tramadol Hcl	193	33
Clopidogrel	Clopidogrel Bisulfate	186	35
Donepezil Hcl	Donepezil Hcl	183	37
Escitalopram Oxalate	Escitalopram Oxalate	181	46
Alendronate Sodium	Alendronate Sodium	175	42
Atenolol	Atenolol	169	43
Lovastatin	Lovastatin	162	39
Citalopram Hbr	Citalopram Hydrobromide	156	37
Montelukast Sodium	Montelukast Sodium	154	41
Pioglitazone Hcl	Pioglitazone Hcl	154	40
Potassium Chloride	Potassium Chloride	152	33
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	149	20
Venlafaxine Hcl Er	Venlafaxine Hcl	149	32
Alprazolam	Alprazolam	146	31
Pregabalin	Pregabalin	146	30
Jardiance	Empagliflozin	136	27
Fluoxetine Hcl	Fluoxetine Hcl	134	25
Fluticasone Propionate	Fluticasone Propionate	129	37
Rosuvastatin Calcium	Rosuvastatin Calcium	128	35
Baclofen	Baclofen	118	25
Ozempic	Semaglutide	116	22
Bupropion Hcl Sr	Bupropion Hcl	115	32
Lorazepam	Lorazepam	114	25
Metoprolol Tartrate	Metoprolol Tartrate	108	23
Torsemide	Torsemide	108	25
Valsartan	Valsartan	106	28
Hydralazine Hcl	Hydralazine Hcl	105	25
Allopurinol	Allopurinol	99	27
Quetiapine Fumarate	Quetiapine Fumarate	99	22
Tizanidine Hcl	Tizanidine Hcl	97	19
Warfarin Sodium	Warfarin Sodium	96	25
Benazepril Hcl	Benazepril Hcl	92	21
Memantine Hcl	Memantine Hcl	88	19
Zolpidem Tartrate	Zolpidem Tartrate	88	19
Myrbetriq	Mirabegron	87	13
Ropinirole Hcl	Ropinirole Hcl	86	13
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	80	20
Ezetimibe	Ezetimibe	79	23
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	78	25
Diclofenac Sodium	Diclofenac Sodium	76	24
Clonazepam	Clonazepam	74	suppressed
Morphine Sulfate Er	Morphine Sulfate	74	suppressed
Rybelsus	Semaglutide	69	20
Ondansetron Hcl	Ondansetron Hcl	67	15
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	67	24
Estradiol	Estradiol	66	21
Cephalexin	Cephalexin	65	46
Irbesartan	Irbesartan	64	13
Glipizide	Glipizide	63	11
Carbidopa-Levodopa	Carbidopa/Levodopa	62	11
Diazepam	Diazepam	61	12
Glimepiride	Glimepiride	59	15
Oxycodone Hcl	Oxycodone Hcl	59	14
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	57	12
Celecoxib	Celecoxib	56	17
Chlorthalidone	Chlorthalidone	55	15
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	55	16
Ibuprofen	Ibuprofen	55	21
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	53	12
Lidocaine	Lidocaine	53	suppressed
Latanoprost	Latanoprost	52	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	51	11
Buspirone Hcl	Buspirone Hcl	51	13
Propranolol Hcl	Propranolol Hcl	50	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	50	33
Bupropion Xl	Bupropion Hcl	48	11
Hydroxyzine Hcl	Hydroxyzine Hcl	48	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	47	16
Synthroid	Levothyroxine Sodium	47	14
Ondansetron Odt	Ondansetron	46	20
Raloxifene Hcl	Raloxifene Hcl	46	11
Acetaminophen-Codeine	Acetaminophen With Codeine	45	12
Aripiprazole	Aripiprazole	45	suppressed
Januvia	Sitagliptin Phosphate	45	13
Nortriptyline Hcl	Nortriptyline Hcl	45	11
Prednisone	Prednisone	45	14
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	45	suppressed
Clonidine Hcl	Clonidine Hcl	44	suppressed
Digoxin	Digoxin	44	11
Propranolol Hcl Er	Propranolol Hcl	43	12
Doxazosin Mesylate	Doxazosin Mesylate	42	11
Azithromycin	Azithromycin	41	38
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	41	13
Levetiracetam	Levetiracetam	41	suppressed
Bumetanide	Bumetanide	39	suppressed
Felodipine Er	Felodipine	39	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	37	suppressed
Linzess	Linaclotide	37	suppressed
Methylprednisolone	Methylprednisolone	37	32
Farxiga	Dapagliflozin Propanediol	36	suppressed
Lactulose	Lactulose	36	suppressed
Amiodarone Hcl	Amiodarone Hcl	35	suppressed
Nystatin	Nystatin	35	26
Incruse Ellipta	Umeclidinium Bromide	34	suppressed
Labetalol Hcl	Labetalol Hcl	34	12
Ventolin Hfa	Albuterol Sulfate	34	suppressed
Combivent Respimat	Ipratropium/Albuterol Sulfate	33	suppressed
Ipratropium Bromide	Ipratropium Bromide	33	15
Telmisartan	Telmisartan	33	11
Fenofibrate	Fenofibrate	32	suppressed
Galantamine Hbr	Galantamine Hbr	32	suppressed
Nifedipine Er	Nifedipine	32	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	31	suppressed
Wixela Inhub	Fluticasone Propion/Salmeterol	31	suppressed
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	30	12
Trulicity	Dulaglutide	30	suppressed
Acyclovir	Acyclovir	29	12
Divalproex Sodium	Divalproex Sodium	29	suppressed
Glipizide Er	Glipizide	29	suppressed
Meclizine Hcl	Meclizine Hcl	29	13
Promethazine Hcl	Promethazine Hcl	29	suppressed
Butalbital-Acetaminophen-Caffe	Butalb/Acetaminophen/Caffeine	28	suppressed
Lamotrigine	Lamotrigine	28	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	27	21
Calcitonin-Salmon	Calcitonin,salmon,synthetic	27	suppressed
Morphine Sulfate	Morphine Sulfate	27	suppressed
Primidone	Primidone	27	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	26	23
Comfort Ez Pen Needle	Pen Needle, Diabetic	26	suppressed
Lantus	Insulin Glargine,hum.Rec.Anlog	26	suppressed
Liothyronine Sodium	Liothyronine Sodium	26	suppressed
Paxlovid	Nirmatrelvir/Ritonavir	26	26
Meloxicam	Meloxicam	25	suppressed
Breo Ellipta	Fluticasone/Vilanterol	24	suppressed
Paroxetine Hcl	Paroxetine Hcl	24	suppressed
Desipramine Hcl	Desipramine Hcl	23	suppressed
Dilt-Xr	Diltiazem Hcl	23	suppressed
Methenamine Hippurate	Methenamine Hippurate	23	suppressed
Naproxen	Naproxen	23	suppressed
Ezetimibe-Simvastatin	Ezetimibe/Simvastatin	22	suppressed
Humalog	Insulin Lispro	22	suppressed
Methadone Hcl	Methadone Hcl	22	suppressed
Mometasone Furoate	Mometasone Furoate	22	suppressed
Ramipril	Ramipril	22	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	22	suppressed
Creon	Lipase/Protease/Amylase	21	suppressed
Insulin Glargine-Yfgn	Insulin Glargine-Yfgn	21	suppressed
Terazosin Hcl	Terazosin Hcl	21	suppressed
Venlafaxine Hcl	Venlafaxine Hcl	21	suppressed
Diltiazem 24hr Er (Xr)	Diltiazem Hcl	20	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	20	suppressed
Fenofibrate	Fenofibrate Nanocrystallized	20	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	20	11
Calcitriol	Calcitriol	19	suppressed
Carisoprodol	Carisoprodol	19	suppressed
Diltiazem 24hr Er	Diltiazem Hcl	19	suppressed
Entresto	Sacubitril/Valsartan	19	suppressed
Lyrica	Pregabalin	19	suppressed
Olanzapine	Olanzapine	19	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	19	13
Topiramate	Topiramate	19	suppressed
Fluconazole	Fluconazole	18	12
Hydroxychloroquine Sulfate	Hydroxychloroquine Sulfate	18	suppressed
Ibandronate Sodium	Ibandronate Sodium	18	suppressed
Insulin Lispro	Insulin Lispro	18	suppressed
Nitroglycerin	Nitroglycerin	18	13
Bisoprolol Fumarate	Bisoprolol Fumarate	17	suppressed
Bupropion Hcl	Bupropion Hcl	17	suppressed
Humalog Mix 75-25 Kwikpen	Insulin Lispro Protamin/Lispro	17	suppressed
Novolog Mix 70-30 Flexpen	Insulin Aspart Prot/Insuln Asp	17	suppressed
Oxcarbazepine	Oxcarbazepine	17	suppressed
Anastrozole	Anastrozole	16	suppressed
Breyna	Budesonide/Formoterol Fumarate	16	suppressed
Candesartan Cilexetil	Candesartan Cilexetil	16	suppressed
Fluticasone Propionate Hfa	Fluticasone Propionate	15	suppressed
Hydrocortisone	Hydrocortisone	15	suppressed
Invokana	Canagliflozin	15	suppressed
Metoclopramide Hcl	Metoclopramide Hcl	15	suppressed
Sildenafil Citrate	Sildenafil Citrate	15	suppressed
Spironolactone-Hctz	Spironolact/Hydrochlorothiazid	15	suppressed
Tresiba Flextouch U-100	Insulin Degludec	15	suppressed
Valacyclovir	Valacyclovir Hcl	15	12
Victoza 2-Pak	Liraglutide	15	suppressed
Clotrimazole-Betamethasone	Clotrimazole/Betamethasone Dip	14	suppressed
Insulin Lispro Kwikpen U-100	Insulin Lispro	14	suppressed
Prochlorperazine Maleate	Prochlorperazine Maleate	14	suppressed
Spiriva Handihaler	Tiotropium Bromide	14	suppressed
Azelastine Hcl	Azelastine Hcl	13	suppressed
Buprenorphine	Buprenorphine	13	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	13	suppressed
Dotti	Estradiol	13	suppressed
Emsam	Selegiline	13	suppressed
Sucralfate	Sucralfate	13	suppressed
Testosterone Cypionate	Testosterone Cypionate	13	suppressed
Veozah	Fezolinetant	13	suppressed
Betamethasone Dipropionate	Betamethasone Dipropionate	12	suppressed
Clotrimazole	Clotrimazole	12	suppressed
Flecainide Acetate	Flecainide Acetate	12	suppressed
Gemfibrozil	Gemfibrozil	12	suppressed
Hydrocodone Bitartrate Er	Hydrocodone Bitartrate	12	suppressed
Hydromorphone Hcl	Hydromorphone Hcl	12	suppressed
Loperamide	Loperamide Hcl	12	suppressed
Menest	Estrogens,esterified	12	suppressed
Mupirocin	Mupirocin	12	suppressed
Olmesartan Medoxomil	Olmesartan Medoxomil	12	suppressed
Potassium Citrate Er	Potassium Citrate	12	suppressed
Progesterone	Progesterone, Micronized	12	suppressed
Repaglinide	Repaglinide	12	suppressed
Tramadol Hcl Er	Tramadol Hcl	12	suppressed
Armodafinil	Armodafinil	11	suppressed
Cartia Xt	Diltiazem Hcl	11	suppressed
Diclofenac Epolamine	Diclofenac Epolamine	11	suppressed
Diphenoxylate-Atropine	Diphenoxylate Hcl/Atropine	11	suppressed
Enoxaparin Sodium	Enoxaparin Sodium	11	suppressed
Fenofibrate	Fenofibrate,micronized	11	suppressed
Ipratropium-Albuterol	Ipratropium/Albuterol Sulfate	11	suppressed
Metronidazole	Metronidazole	11	suppressed
Midodrine Hcl	Midodrine Hcl	11	suppressed
Propafenone Hcl Er	Propafenone Hcl	11	suppressed
Ultra-Fine Mini Pen Needle	Pen Needle, Diabetic	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