Healthcare provider profile · identity verified

Patrick Chen, MD

Family Practice · OAKLAND, CA · NPI 1285933275

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	405	144
Amlodipine Besylate	Amlodipine Besylate	240	92
Lisinopril	Lisinopril	135	57
Levothyroxine Sodium	Levothyroxine Sodium	125	46
Losartan Potassium	Losartan Potassium	110	46
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	109	29
Tamsulosin Hcl	Tamsulosin Hcl	98	39
Hydrochlorothiazide	Hydrochlorothiazide	94	40
Albuterol Sulfate Hfa	Albuterol Sulfate	91	51
Gabapentin	Gabapentin	80	34
Meloxicam	Meloxicam	75	26
Metoprolol Tartrate	Metoprolol Tartrate	69	27
Simvastatin	Simvastatin	67	24
Alvesco	Ciclesonide	60	23
Famotidine	Famotidine	56	26
Pradaxa	Dabigatran Etexilate Mesylate	55	20
Ibuprofen	Ibuprofen	53	24
Pantoprazole Sodium	Pantoprazole Sodium	53	25
Alendronate Sodium	Alendronate Sodium	51	20
Fluticasone Propionate	Fluticasone Propionate	51	27
Metformin Hcl	Metformin Hcl	50	22
Zolpidem Tartrate	Zolpidem Tartrate	47	11
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	46	18
Trazodone Hcl	Trazodone Hcl	45	18
Lidocaine	Lidocaine	44	16
Sertraline Hcl	Sertraline Hcl	44	15
Wixela Inhub	Fluticasone Propion/Salmeterol	43	13
Furosemide	Furosemide	42	15
Lorazepam	Lorazepam	40	13
Acyclovir	Acyclovir	39	15
Montelukast Sodium	Montelukast Sodium	39	17
Triamcinolone Acetonide	Triamcinolone Acetonide	39	19
Spiriva Respimat	Tiotropium Bromide	37	11
Allopurinol	Allopurinol	36	13
Fluocinonide	Fluocinonide	35	21
Atenolol	Atenolol	34	14
Prednisone	Prednisone	33	13
Cefadroxil	Cefadroxil	32	24
Citalopram Hbr	Citalopram Hydrobromide	31	12
Glipizide	Glipizide	31	11
Hydrocortisone	Hydrocortisone	30	15
Carvedilol	Carvedilol	29	suppressed
Terazosin Hcl	Terazosin Hcl	28	suppressed
Clopidogrel	Clopidogrel Bisulfate	26	suppressed
Finasteride	Finasteride	26	suppressed
Lovastatin	Lovastatin	26	suppressed
Metoprolol Succinate	Metoprolol Succinate	26	12
Naproxen	Naproxen	26	11
Omeprazole	Omeprazole	26	14
Mirtazapine	Mirtazapine	23	suppressed
Mupirocin	Mupirocin	23	suppressed
Hydralazine Hcl	Hydralazine Hcl	22	11
Dorzolamide-Timolol	Dorzolamide Hcl/Timolol Maleat	21	suppressed
Tizanidine Hcl	Tizanidine Hcl	20	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	19	suppressed
Adacel Tdap	Diph,pertuss(Acell),tet Vac/Pf	18	18
Bupropion Hcl Sr	Bupropion Hcl	18	suppressed
Doxycycline Monohydrate	Doxycycline Monohydrate	18	15
Escitalopram Oxalate	Escitalopram Oxalate	18	suppressed
Latanoprost	Latanoprost	18	suppressed
Levetiracetam	Levetiracetam	18	suppressed
Metformin Hcl Er	Metformin Hcl	17	suppressed
Colchicine	Colchicine	16	suppressed
Pilocarpine Hcl	Pilocarpine Hcl	16	suppressed
Bupropion Xl	Bupropion Hcl	15	suppressed
Chlorthalidone	Chlorthalidone	15	suppressed
Clindamycin Hcl	Clindamycin Hcl	15	suppressed
Insulin Glargine-Yfgn	Insulin Glargine-Yfgn	15	suppressed
Lokelma	Sodium Zirconium Cyclosilicate	15	suppressed
Valacyclovir	Valacyclovir Hcl	15	suppressed
Mesalamine	Mesalamine	14	suppressed
Rosuvastatin Calcium	Rosuvastatin Calcium	14	suppressed
Alprazolam	Alprazolam	13	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	13	11
Potassium Chloride	Potassium Chloride	13	suppressed
Spironolactone	Spironolactone	13	suppressed
Temazepam	Temazepam	13	suppressed
Acetaminophen-Codeine	Acetaminophen With Codeine	12	suppressed
Hydromorphone Hcl	Hydromorphone Hcl	12	suppressed
Pravastatin Sodium	Pravastatin Sodium	12	suppressed
Buspirone Hcl	Buspirone Hcl	11	suppressed
Carbidopa-Levodopa	Carbidopa/Levodopa	11	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	11	suppressed
Humulin R	Insulin Regular, Human	11	suppressed
Oxycodone Hcl	Oxycodone Hcl	11	suppressed
Phenytoin Sodium Extended	Phenytoin Sodium Extended	11	suppressed
Tramadol Hcl	Tramadol 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

Full methodology · Questions & answers · Report a possible error