Healthcare provider profile · identity verified

Fang Guo, MD

Internal Medicine · STOCKTON, CA · NPI 1598843401

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	388	152
Losartan Potassium	Losartan Potassium	196	82
Amlodipine Besylate	Amlodipine Besylate	184	76
Lisinopril	Lisinopril	154	61
Levothyroxine Sodium	Levothyroxine Sodium	153	59
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	137	34
Hydrochlorothiazide	Hydrochlorothiazide	109	48
Metoprolol Tartrate	Metoprolol Tartrate	107	41
Metformin Hcl	Metformin Hcl	103	41
Ibuprofen	Ibuprofen	95	37
Famotidine	Famotidine	84	32
Trazodone Hcl	Trazodone Hcl	82	26
Fluticasone Propionate	Fluticasone Propionate	81	36
Alendronate Sodium	Alendronate Sodium	79	30
Terazosin Hcl	Terazosin Hcl	71	20
Gabapentin	Gabapentin	70	29
Atenolol	Atenolol	67	25
Rosuvastatin Calcium	Rosuvastatin Calcium	65	25
Omeprazole	Omeprazole	61	25
Metformin Hcl Er	Metformin Hcl	60	22
Albuterol Sulfate Hfa	Albuterol Sulfate	57	35
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	56	26
Metoprolol Succinate	Metoprolol Succinate	56	25
Potassium Chloride	Potassium Chloride	55	19
Tamsulosin Hcl	Tamsulosin Hcl	51	21
Simvastatin	Simvastatin	50	22
Hydrocortisone	Hydrocortisone	49	23
Alvesco	Ciclesonide	48	25
Jardiance	Empagliflozin	48	18
Glipizide	Glipizide	46	21
Montelukast Sodium	Montelukast Sodium	42	16
Furosemide	Furosemide	41	21
Humulin N	Insulin Nph Human Isophane	40	18
Ozempic	Semaglutide	37	11
Pantoprazole Sodium	Pantoprazole Sodium	37	17
Azithromycin	Azithromycin	36	32
Amoxicillin	Amoxicillin	34	21
Colchicine	Colchicine	32	15
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	32	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	30	17
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	29	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	28	14
Allopurinol	Allopurinol	27	14
Humulin R	Insulin Regular, Human	27	suppressed
Clobetasol Propionate	Clobetasol Propionate	26	15
Carvedilol	Carvedilol	25	15
Fluocinonide	Fluocinonide	24	suppressed
Glipizide Er	Glipizide	23	suppressed
Hydralazine Hcl	Hydralazine Hcl	23	15
Lovastatin	Lovastatin	23	suppressed
Buspirone Hcl	Buspirone Hcl	22	suppressed
Tizanidine Hcl	Tizanidine Hcl	22	suppressed
Acetaminophen-Codeine	Acetaminophen With Codeine	21	suppressed
Baclofen	Baclofen	21	11
Clopidogrel	Clopidogrel Bisulfate	21	suppressed
Prednisone	Prednisone	20	18
Veo Insulin Syringe	Syringe And Needle,insulin,1ml	20	suppressed
Doxycycline Monohydrate	Doxycycline Monohydrate	19	15
Veo Insulin Syringe	Syringe-Needle,insulin,0.5 Ml	19	suppressed
Wixela Inhub	Fluticasone Propion/Salmeterol	19	suppressed
Duloxetine Hcl	Duloxetine Hcl	18	11
Naproxen	Naproxen	18	suppressed
Spironolactone	Spironolactone	18	suppressed
Cefadroxil	Cefadroxil	17	suppressed
Insulin Glargine-Yfgn	Insulin Glargine-Yfgn	17	suppressed
Temazepam	Temazepam	17	suppressed
Citalopram Hbr	Citalopram Hydrobromide	16	suppressed
Sertraline Hcl	Sertraline Hcl	16	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	15	12
Combivent Respimat	Ipratropium/Albuterol Sulfate	15	suppressed
Pravastatin Sodium	Pravastatin Sodium	15	suppressed
Nabumetone	Nabumetone	14	suppressed
Nystatin	Nystatin	14	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	14	suppressed
Lantus	Insulin Glargine,hum.Rec.Anlog	13	suppressed
Alprazolam	Alprazolam	12	suppressed
Pradaxa	Dabigatran Etexilate Mesylate	12	suppressed
Ritalin	Methylphenidate Hcl	12	suppressed
Ultra-Fine Mini Pen Needle	Pen Needle, Diabetic	12	suppressed
Bupropion Hcl Sr	Bupropion Hcl	11	suppressed
Ketoconazole	Ketoconazole	11	suppressed
Lidocaine	Lidocaine	11	suppressed
Propranolol Hcl	Propranolol Hcl	11	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	11	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	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