Healthcare provider profile · identity verified

Janice K Ko, M.D.

Family Practice · HOFFMAN ESTATES, IL · NPI 1124348339

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	797	226
Levothyroxine Sodium	Levothyroxine Sodium	500	136
Amlodipine Besylate	Amlodipine Besylate	417	128
Lisinopril	Lisinopril	360	102
Losartan Potassium	Losartan Potassium	357	111
Rosuvastatin Calcium	Rosuvastatin Calcium	321	95
Metoprolol Succinate	Metoprolol Succinate	259	76
Hydrochlorothiazide	Hydrochlorothiazide	185	56
Metformin Hcl	Metformin Hcl	159	49
Omeprazole	Omeprazole	156	57
Metformin Hcl Er	Metformin Hcl	148	44
Alprazolam	Alprazolam	133	34
Simvastatin	Simvastatin	123	38
Lorazepam	Lorazepam	119	27
Pantoprazole Sodium	Pantoprazole Sodium	117	47
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	116	31
Pravastatin Sodium	Pravastatin Sodium	106	33
Alendronate Sodium	Alendronate Sodium	102	34
Sertraline Hcl	Sertraline Hcl	96	28
Montelukast Sodium	Montelukast Sodium	94	28
Tamsulosin Hcl	Tamsulosin Hcl	92	29
Gabapentin	Gabapentin	88	35
Escitalopram Oxalate	Escitalopram Oxalate	86	29
Tramadol Hcl	Tramadol Hcl	86	28
Metoprolol Tartrate	Metoprolol Tartrate	79	24
Zolpidem Tartrate	Zolpidem Tartrate	73	29
Furosemide	Furosemide	64	24
Fluticasone Propionate	Fluticasone Propionate	62	19
Glimepiride	Glimepiride	62	19
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	62	20
Clonazepam	Clonazepam	58	12
Bupropion Hcl Sr	Bupropion Hcl	56	19
Synthroid	Levothyroxine Sodium	56	13
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	56	18
Hydralazine Hcl	Hydralazine Hcl	54	20
Albuterol Sulfate Hfa	Albuterol Sulfate	53	33
Meloxicam	Meloxicam	53	28
Clopidogrel	Clopidogrel Bisulfate	51	15
Atenolol	Atenolol	50	14
Potassium Chloride	Potassium Chloride	50	21
Allopurinol	Allopurinol	48	15
Carvedilol	Carvedilol	46	15
Glipizide Er	Glipizide	46	15
Famotidine	Famotidine	44	13
Trazodone Hcl	Trazodone Hcl	43	17
Fenofibrate	Fenofibrate	42	11
Fluoxetine Hcl	Fluoxetine Hcl	42	14
Glipizide	Glipizide	42	12
Valsartan	Valsartan	42	15
Eliquis	Apixaban	41	15
Pioglitazone Hcl	Pioglitazone Hcl	41	12
Triamcinolone Acetonide	Triamcinolone Acetonide	40	25
Mounjaro	Tirzepatide	39	suppressed
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	38	26
Irbesartan	Irbesartan	37	suppressed
Jardiance	Empagliflozin	36	11
Duloxetine Hcl	Duloxetine Hcl	34	12
Mirtazapine	Mirtazapine	34	13
Oxybutynin Chloride Er	Oxybutynin Chloride	34	13
Lovastatin	Lovastatin	33	suppressed
Chlorthalidone	Chlorthalidone	31	suppressed
Citalopram Hbr	Citalopram Hydrobromide	31	suppressed
Risedronate Sodium	Risedronate Sodium	31	suppressed
Donepezil Hcl	Donepezil Hcl	30	suppressed
Finasteride	Finasteride	29	suppressed
Ozempic	Semaglutide	29	11
Meclizine Hcl	Meclizine Hcl	28	suppressed
Nifedipine Er	Nifedipine	28	suppressed
Valacyclovir	Valacyclovir Hcl	27	15
Dropsafe Prep Pads	Alcohol Antiseptic Pads	26	suppressed
Estradiol	Estradiol	26	11
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	26	22
Bupropion Xl	Bupropion Hcl	25	suppressed
Paxlovid	Nirmatrelvir/Ritonavir	25	22
Ezetimibe	Ezetimibe	24	suppressed
Ramipril	Ramipril	24	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	23	suppressed
Azithromycin	Azithromycin	23	21
Irbesartan-Hydrochlorothiazide	Irbesartan/Hydrochlorothiazide	23	suppressed
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	23	13
Amoxicillin	Amoxicillin	22	20
Celecoxib	Celecoxib	22	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	22	suppressed
Hydromorphone Hcl	Hydromorphone Hcl	22	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	22	suppressed
Methylprednisolone	Methylprednisolone	22	18
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	22	18
Ipratropium Bromide	Ipratropium Bromide	20	11
Paroxetine Hcl	Paroxetine Hcl	20	suppressed
Ropinirole Hcl	Ropinirole Hcl	20	suppressed
Terazosin Hcl	Terazosin Hcl	20	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	20	suppressed
Buspirone Hcl	Buspirone Hcl	19	suppressed
Lamotrigine	Lamotrigine	19	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	18	suppressed
Naproxen	Naproxen	18	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	18	suppressed
Zenpep	Lipase/Protease/Amylase	18	suppressed
Fluconazole	Fluconazole	17	11
Myrbetriq	Mirabegron	17	suppressed
Novolog	Insulin Aspart	17	suppressed
Ondansetron Hcl	Ondansetron Hcl	16	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	15	suppressed
Fenofibrate	Fenofibrate Nanocrystallized	15	suppressed
Novolog Flexpen	Insulin Aspart	15	suppressed
Prednisone	Prednisone	15	14
Quetiapine Fumarate	Quetiapine Fumarate	15	suppressed
Sildenafil Citrate	Sildenafil Citrate	15	suppressed
Belsomra	Suvorexant	14	suppressed
Clonidine Hcl	Clonidine Hcl	14	suppressed
Januvia	Sitagliptin Phosphate	14	suppressed
Propranolol Hcl	Propranolol Hcl	14	suppressed
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	14	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	13	suppressed
Eszopiclone	Eszopiclone	13	suppressed
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	13	suppressed
Naltrexone Hcl	Naltrexone Hcl	12	suppressed
Spironolactone	Spironolactone	12	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	11	suppressed
Butalb-Acetaminoph-Caff-Codein	Butalbit/Acetamin/Caff/Codeine	11	suppressed
Cephalexin	Cephalexin	11	suppressed
Enalapril Maleate	Enalapril Maleate	11	suppressed
Fentanyl	Fentanyl	11	suppressed
Hydrocortisone	Hydrocortisone	11	suppressed
Lantus	Insulin Glargine,hum.Rec.Anlog	11	suppressed
Olmesartan Medoxomil	Olmesartan Medoxomil	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