Healthcare provider profile · identity verified

Michael I. Park, MD

Internal Medicine · WALNUT CREEK, CA · NPI 1598843690

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	1205	421
Amlodipine Besylate	Amlodipine Besylate	601	208
Fluticasone Propionate	Fluticasone Propionate	406	207
Lisinopril	Lisinopril	393	140
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	386	129
Losartan Potassium	Losartan Potassium	318	120
Levothyroxine Sodium	Levothyroxine Sodium	295	105
Alendronate Sodium	Alendronate Sodium	286	97
Tamsulosin Hcl	Tamsulosin Hcl	279	103
Simvastatin	Simvastatin	250	85
Atenolol	Atenolol	212	83
Famotidine	Famotidine	204	67
Hydrochlorothiazide	Hydrochlorothiazide	204	81
Gabapentin	Gabapentin	194	85
Arexvy	Rsvpref3 Antigen/As01e/Pf	170	170
Terazosin Hcl	Terazosin Hcl	162	49
Ipratropium Bromide	Ipratropium Bromide	160	97
Pantoprazole Sodium	Pantoprazole Sodium	154	42
Trazodone Hcl	Trazodone Hcl	147	52
Metformin Hcl	Metformin Hcl	146	56
Metformin Hcl Er	Metformin Hcl	146	58
Allopurinol	Allopurinol	140	49
Metoprolol Tartrate	Metoprolol Tartrate	136	46
Rosuvastatin Calcium	Rosuvastatin Calcium	133	48
Albuterol Sulfate Hfa	Albuterol Sulfate	128	79
Tizanidine Hcl	Tizanidine Hcl	124	44
Wixela Inhub	Fluticasone Propion/Salmeterol	118	43
Furosemide	Furosemide	107	43
Azithromycin	Azithromycin	104	91
Glipizide	Glipizide	99	35
Pradaxa	Dabigatran Etexilate Mesylate	98	33
Omeprazole	Omeprazole	90	33
Hydralazine Hcl	Hydralazine Hcl	88	36
Lovastatin	Lovastatin	85	30
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	82	27
Pravastatin Sodium	Pravastatin Sodium	82	27
Metoprolol Succinate	Metoprolol Succinate	78	33
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	75	23
Meloxicam	Meloxicam	75	35
Temazepam	Temazepam	75	21
Citalopram Hbr	Citalopram Hydrobromide	71	26
Triamcinolone Acetonide	Triamcinolone Acetonide	70	48
Chlorthalidone	Chlorthalidone	66	31
Hydrocortisone	Hydrocortisone	64	45
Clobetasol Propionate	Clobetasol Propionate	63	28
Finasteride	Finasteride	61	23
Ibuprofen	Ibuprofen	60	32
Sertraline Hcl	Sertraline Hcl	60	24
Azelastine Hcl	Azelastine Hcl	59	13
Shingrix	Varicella-Zoster Ge/As01b/Pf	59	44
Ondansetron Odt	Ondansetron	56	suppressed
Colchicine	Colchicine	55	30
Carvedilol	Carvedilol	54	19
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	53	51
Lorazepam	Lorazepam	53	26
Potassium Chloride	Potassium Chloride	53	20
Glipizide Er	Glipizide	46	18
Bupropion Xl	Bupropion Hcl	43	16
Jardiance	Empagliflozin	43	15
Duloxetine Hcl	Duloxetine Hcl	42	15
Alvesco	Ciclesonide	40	23
Boostrix Tdap	Diphth,pertuss(Acell),tet Vac	40	40
Montelukast Sodium	Montelukast Sodium	40	12
Ciclopirox	Ciclopirox	39	22
Fluocinonide	Fluocinonide	39	26
Humulin N	Insulin Nph Human Isophane	39	13
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	38	15
Acetaminophen-Codeine	Acetaminophen With Codeine	37	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	37	12
Isosorbide Mononitrate Er	Isosorbide Mononitrate	37	14
Breyna	Budesonide/Formoterol Fumarate	36	18
Clopidogrel	Clopidogrel Bisulfate	35	13
Cephalexin	Cephalexin	34	28
Doxycycline Monohydrate	Doxycycline Monohydrate	34	28
Lactulose	Lactulose	34	suppressed
Prednisone	Prednisone	34	28
Sucralfate	Sucralfate	34	suppressed
Acyclovir	Acyclovir	32	19
Quetiapine Fumarate	Quetiapine Fumarate	29	suppressed
Adacel Tdap	Diph,pertuss(Acell),tet Vac/Pf	28	28
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	27	23
Propranolol Hcl	Propranolol Hcl	27	suppressed
Amoxicillin	Amoxicillin	26	16
Ciprofloxacin Hcl	Ciprofloxacin Hcl	26	22
Ozempic	Semaglutide	25	suppressed
Clindamycin Phosphate	Clindamycin Phosphate	24	19
Insulin Glargine-Yfgn	Insulin Glargine-Yfgn	23	11
Oxybutynin Chloride Er	Oxybutynin Chloride	23	11
Mirtazapine	Mirtazapine	22	suppressed
Veo Insulin Syringe	Syringe-Needle,insulin,0.5 Ml	22	suppressed
Eliquis	Apixaban	21	suppressed
Ondansetron Hcl	Ondansetron Hcl	21	14
Bisoprolol Fumarate	Bisoprolol Fumarate	20	suppressed
Nitroglycerin	Nitroglycerin	20	12
Paxlovid	Nirmatrelvir/Ritonavir	20	20
Venlafaxine Hcl Er	Venlafaxine Hcl	20	suppressed
Buspirone Hcl	Buspirone Hcl	19	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	19	suppressed
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	19	suppressed
Clonidine Hcl	Clonidine Hcl	17	suppressed
Fenofibrate	Fenofibrate	17	suppressed
Ibandronate Sodium	Ibandronate Sodium	17	suppressed
Mupirocin	Mupirocin	17	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	17	16
Bupropion Hcl Sr	Bupropion Hcl	16	suppressed
Dextroamphetamine-Amphet Er	Dextroamphetamine/Amphetamine	16	suppressed
Propranolol Hcl Er	Propranolol Hcl	16	suppressed
Verapamil Er	Verapamil Hcl	16	suppressed
Digoxin	Digoxin	15	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	15	suppressed
Prochlorperazine Maleate	Prochlorperazine Maleate	15	suppressed
Clonazepam	Clonazepam	14	suppressed
Polymyxin B Sul-Trimethoprim	Polymyxin B Sulf/Trimethoprim	14	14
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	14	suppressed
Spiriva Respimat	Tiotropium Bromide	14	suppressed
Tramadol Hcl	Tramadol Hcl	13	suppressed
Celecoxib	Celecoxib	12	suppressed
Neomycin-Polymyxin-Dexameth	Neomycin/Polymyxin B/Dexametha	12	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	12	suppressed
Spironolactone	Spironolactone	12	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	12	suppressed
Ketoconazole	Ketoconazole	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