Payment overview · 2025
General Payments
$407.08
17 reported records · 13 companies
Healthcare provider profile · identity verified
Michael Lin Zhang, M.D.
Allopathic & Osteopathic Physicians|Urology · STOCKTON, CA · NPI 1275920977
Verified facts
What the public records show
CMS Open Payments records show Michael Lin Zhang, M.D. received $407.08 in general payments during 2025 across 17 reported records.
Janssen Biotech, Inc. accounted for 23.9% of that reported general-payment amount.
The Open Payments records used for this analysis explicitly named 13 associated products.
A separate comparison found the same explicitly named product in public Medicare Part D data: Xtandi.
PFIZER INC. reported payments to this doctor in 2025. Across the 2025 Open Payments General Payment records loaded for this analysis, that same reporting entity reported XTANDI as an associated drug or biological on 19368 records involving 7657 distinct recipient NPIs. Public Medicare Part D data also shows 23 claims for Xtandi by this doctor in 2024.
These records do not establish that a payment influenced prescribing or medical care.
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.
Who paid this doctor?
Companies in 2025 General Payments
| Reported company | Canonical company | Amount | Share | Records | Year |
|---|---|---|---|---|---|
| Janssen Biotech, Inc. | Unresolved — no canonical attribution shown | $97.15 | 23.9% | 3 | 2025 |
| Cook Medical LLC | Unresolved — no canonical attribution shown | $50.28 | 12.3% | 2 | 2025 |
| ConvaTec Inc. | Unresolved — no canonical attribution shown | $41.36 | 10.2% | 1 | 2025 |
| Teleflex LLC | Unresolved — no canonical attribution shown | $38.63 | 9.5% | 2 | 2025 |
| Ambu Inc. | Unresolved — no canonical attribution shown | $25.14 | 6.2% | 1 | 2025 |
| DENTSPLY IH AB | Unresolved — no canonical attribution shown | $23.27 | 5.7% | 1 | 2025 |
| Merck Sharp & Dohme LLC | Unresolved — no canonical attribution shown | $22.45 | 5.5% | 1 | 2025 |
| PFIZER INC. | Unresolved — no canonical attribution shown | $21.55 | 5.3% | 1 | 2025 |
| ABBVIE INC. | Unresolved — no canonical attribution shown | $20.82 | 5.1% | 1 | 2025 |
| ACCORD HEALTHCARE, INC. | Unresolved — no canonical attribution shown | $19.36 | 4.8% | 1 | 2025 |
| Ethicon US, LLC | Unresolved — no canonical attribution shown | $19.16 | 4.7% | 1 | 2025 |
| ViiV Healthcare Company | Unresolved — no canonical attribution shown | $14.33 | 3.5% | 1 | 2025 |
| COLOPLAST CORP | Unresolved — no canonical attribution shown | $13.58 | 3.3% | 1 | 2025 |
What were the payments for?
Payment categories
| Category | Amount | Records |
|---|---|---|
| Food and Beverage | $407.08 | 17 |
A meal, consulting fee, royalty, and travel payment describe different kinds of reported relationships and should not be interpreted as equivalent.
Analysis 1 · Payment-linked products
Products named in Open Payments records
| Reported product | Type | Reported company | Related amount* | Records | Year |
|---|---|---|---|---|---|
| ERLEADA Normalized: erleada |
Drug | Janssen Biotech, Inc. | $97.15 | 3 | 2025 |
Source payment records
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| COOK Normalized: cook |
Device | Cook Medical LLC | $50.28 | 2 | 2025 |
Source payment records
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| GENTLECATH Normalized: gentlecath |
Device | ConvaTec Inc. | $41.36 | 1 | 2025 |
Source payment records
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| BARRIGEL Normalized: barrigel |
Device | Teleflex LLC | $38.63 | 2 | 2025 |
Source payment records
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| LOFRIC Normalized: lofric |
Device | DENTSPLY IH AB | $23.27 | 1 | 2025 |
Source payment records
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| ZERBAXA Normalized: zerbaxa |
Drug | Merck Sharp & Dohme LLC | $22.45 | 1 | 2025 |
Source payment records
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| XTANDI Normalized: xtandi |
Drug | PFIZER INC. | $21.55 | 1 | 2025 |
Source payment records
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| BOTOX Normalized: botox |
Biological | ABBVIE INC. | $20.82 | 1 | 2025 |
Source payment records
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| Camcevi Normalized: camcevi |
Drug | ACCORD HEALTHCARE, INC. | $19.36 | 1 | 2025 |
Source payment records
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| EVARREST Normalized: evarrest |
Biological | Ethicon US, LLC | $19.16 | 1 | 2025 |
Source payment records
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| STRATAFIX Normalized: stratafix |
Device | Ethicon US, LLC | $19.16 | 1 | 2025 |
Source payment records
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| RUKOBIA Normalized: rukobia |
Drug | ViiV Healthcare Company | $14.33 | 1 | 2025 |
Source payment records
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| Coloplast TFL Drive Normalized: coloplast tfl drive |
Device | COLOPLAST CORP | $13.58 | 1 | 2025 |
Source payment records
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* Product-associated amounts are non-additive because one payment record may name more than one product.
These products were named on specific Open Payments records. A named product does not show that the payment influenced treatment or prescribing.
Public prescribing for products named in payments
| Open Payments product | Payment year | Part D brand | Part D year | Claims | Match method | Source |
|---|---|---|---|---|---|---|
| XTANDI xtandi |
2025 | Xtandi | 2024 | 23 Beneficiary count suppressed |
exact normalized | Medicare Part D |
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.
| Paying company | Payment year | Drug reported by same entity | Open Payments evidence | Part D | Claims | Beneficiaries |
|---|---|---|---|---|---|---|
| PFIZER INC. Exact reporting entity; no affiliate inference |
2025 | XTANDI open payments reported associated product |
CMS Open Payments — General Payments 19368 supporting records · 7657 recipient NPIs · example record 1228794230 |
Xtandi · 2024 Exact normalized brand match · 1 Part D row |
23 | suppressed by CMS |
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 |
|---|---|---|---|
| Finasteride | Finasteride | 480 | 195 |
| Tamsulosin Hcl | Tamsulosin Hcl | 466 | 197 |
| Myrbetriq | Mirabegron | 333 | 104 |
| Oxybutynin Chloride Er | Oxybutynin Chloride | 202 | 73 |
| Ciprofloxacin Hcl | Ciprofloxacin Hcl | 97 | 81 |
| Cephalexin | Cephalexin | 77 | 66 |
| Estradiol | Estradiol | 72 | 36 |
| Sulfamethoxazole-Trimethoprim | Sulfamethoxazole/Trimethoprim | 58 | 47 |
| Bicalutamide | Bicalutamide | 49 | 22 |
| Nitrofurantoin Mono-Macro | Nitrofurantoin Monohyd/M-Cryst | 44 | 35 |
| Sildenafil Citrate | Sildenafil Citrate | 43 | 17 |
| Solifenacin Succinate | Solifenacin Succinate | 40 | 18 |
| Methenamine Hippurate | Methenamine Hippurate | 39 | 13 |
| Trospium Chloride Er | Trospium Chloride | 39 | 15 |
| Testosterone Cypionate | Testosterone Cypionate | 35 | suppressed |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 33 | 31 |
| Mirabegron Er | Mirabegron | 32 | 14 |
| Oxybutynin Chloride | Oxybutynin Chloride | 25 | 11 |
| Tolterodine Tartrate Er | Tolterodine Tartrate | 24 | suppressed |
| Xtandi | Enzalutamide | 23 | suppressed |
| Gemtesa | Vibegron | 21 | suppressed |
| Dutasteride | Dutasteride | 20 | suppressed |
| Oxycodone-Acetaminophen | Oxycodone Hcl/Acetaminophen | 16 | 15 |
| Potassium Citrate Er | Potassium Citrate | 14 | suppressed |
| Doxazosin Mesylate | Doxazosin Mesylate | 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 | $407.08 · 17 records | Janssen Biotech, Inc. | BARRIGEL, BOTOX, COOK, Camcevi, Coloplast TFL Drive, ERLEADA, EVARREST, GENTLECATH, LOFRIC, RUKOBIA, STRATAFIX, XTANDI, ZERBAXA | 1 | — |
| 2024 | — | — | — | — | Complete |
Questions to ask
Questions you could discuss with your doctor
- What role, if any, does Xtandi play in your treatment recommendations for me?
- How do you evaluate evidence when you have a financial relationship with PFIZER INC.?
- 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 |
Full methodology · Questions & answers · Report a possible error