Payment overview · 2025
General Payments
$1,657.11
66 reported records · 19 companies
Healthcare provider profile · identity verified
Leon Kao, MD
Allopathic & Osteopathic Physicians|Allergy & Immunology|Allergy · GERMANTOWN, MD · NPI 1265639728
Verified facts
What the public records show
CMS Open Payments records show Leon Kao, MD received $1,657.11 in general payments during 2025 across 66 reported records.
GENZYME CORPORATION accounted for 18.9% of that reported general-payment amount.
The Open Payments records used for this analysis explicitly named 22 associated products.
A separate comparison found the same explicitly named product in public Medicare Part D data: Trelegy Ellipta, Xolair.
Genentech USA, 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 Xolair as an associated drug or biological on 11057 records involving 4008 distinct recipient NPIs. Public Medicare Part D data also shows 31 claims for Xolair by this doctor in 2024.
GlaxoSmithKline, LLC. reported payments to this doctor in 2025. Across the 2025 Open Payments General Payment records loaded for this analysis, that same reporting entity reported TRELEGY ELLIPTA as an associated drug or biological on 131532 records involving 37148 distinct recipient NPIs. Public Medicare Part D data also shows 40 claims for Trelegy Ellipta by this doctor in 2024.
Novartis Pharmaceuticals Corporation reported payments to this doctor in 2025. Across the 2025 Open Payments General Payment records loaded for this analysis, that same reporting entity reported XOLAIR as an associated drug or biological on 5293 records involving 2861 distinct recipient NPIs. Public Medicare Part D data also shows 31 claims for Xolair 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 |
|---|---|---|---|---|---|
| GENZYME CORPORATION | Unresolved — no canonical attribution shown | $313.63 | 18.9% | 8 | 2025 |
| AstraZeneca Pharmaceuticals LP | Unresolved — no canonical attribution shown | $265.78 | 16.0% | 11 | 2025 |
| Regeneron Healthcare Solutions, Inc. | Unresolved — no canonical attribution shown | $218.70 | 13.2% | 9 | 2025 |
| ARS Pharmaceuticals Operations, Inc. | Unresolved — no canonical attribution shown | $155.86 | 9.4% | 7 | 2025 |
| Takeda Pharmaceuticals U.S.A., Inc. | Unresolved — no canonical attribution shown | $116.28 | 7.0% | 4 | 2025 |
| Grifols USA, LLC | Unresolved — no canonical attribution shown | $81.96 | 5.0% | 3 | 2025 |
| Novartis Pharmaceuticals Corporation | Unresolved — no canonical attribution shown | $80.19 | 4.8% | 4 | 2025 |
| GlaxoSmithKline, LLC. | Unresolved — no canonical attribution shown | $72.76 | 4.4% | 3 | 2025 |
| Genentech USA, Inc. | Unresolved — no canonical attribution shown | $59.30 | 3.6% | 2 | 2025 |
| Galderma Laboratories, L.P. | Unresolved — no canonical attribution shown | $54.15 | 3.3% | 3 | 2025 |
| Greer Laboratories, Inc. | Unresolved — no canonical attribution shown | $41.39 | 2.5% | 2 | 2025 |
| Organon LLC | Unresolved — no canonical attribution shown | $29.84 | 1.8% | 3 | 2025 |
| BioCryst US Sales Co., LLC | Unresolved — no canonical attribution shown | $27.71 | 1.7% | 1 | 2025 |
| Ionis Pharmaceuticals, Inc. | Unresolved — no canonical attribution shown | $26.19 | 1.6% | 1 | 2025 |
| Lilly USA, LLC | Unresolved — no canonical attribution shown | $25.35 | 1.5% | 1 | 2025 |
| ADMA BioManufacturing LLC | Unresolved — no canonical attribution shown | $23.26 | 1.4% | 1 | 2025 |
| Amgen Inc. | Unresolved — no canonical attribution shown | $23.19 | 1.4% | 1 | 2025 |
| Incyte Corporation | Unresolved — no canonical attribution shown | $22.25 | 1.3% | 1 | 2025 |
| Optinose US, Inc. | Unresolved — no canonical attribution shown | $19.32 | 1.2% | 1 | 2025 |
What were the payments for?
Payment categories
| Category | Amount | Records |
|---|---|---|
| Food and Beverage | $1,627.08 | 64 |
| Consulting Fee | $23.26 | 1 |
| Education | $6.77 | 1 |
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 |
|---|---|---|---|---|---|
| DUPIXENT Normalized: dupixent |
Biological | GENZYME CORPORATION, Regeneron Healthcare Solutions, Inc. | $474.94 | 15 | 2025 |
Source payment records
|
|||||
| NEFFY Normalized: neffy |
Drug | ARS Pharmaceuticals Operations, Inc. | $155.86 | 7 | 2025 |
Source payment records
|
|||||
| TEZSPIRE Normalized: tezspire |
Biological | Amgen Inc., AstraZeneca Pharmaceuticals LP | $116.85 | 4 | 2025 |
Source payment records
|
|||||
| CUVITRU Normalized: cuvitru |
Biological | Takeda Pharmaceuticals U.S.A., Inc. | $90.18 | 3 | 2025 |
Source payment records
|
|||||
| AIRSUPRA Normalized: airsupra |
Drug | AstraZeneca Pharmaceuticals LP | $87.66 | 4 | 2025 |
Source payment records
|
|||||
| FASENRA Normalized: fasenra |
Biological | AstraZeneca Pharmaceuticals LP | $84.46 | 4 | 2025 |
Source payment records
|
|||||
| Xembify Normalized: xembify |
Biological | Grifols USA, LLC | $81.96 | 3 | 2025 |
Source payment records
|
|||||
| XOLAIR Normalized: xolair |
Biological, Drug | Genentech USA, Inc., Novartis Pharmaceuticals Corporation | $79.39 | 3 | 2025 |
Source payment records
|
|||||
| AYVAKIT Normalized: ayvakit |
Biological | GENZYME CORPORATION | $57.39 | 2 | 2025 |
Source payment records
|
|||||
| NEMLUVIO Normalized: nemluvio |
Drug | Galderma Laboratories, L.P. | $54.15 | 3 | 2025 |
Source payment records
|
|||||
| NUCALA Normalized: nucala |
Biological | GlaxoSmithKline, LLC. | $53.22 | 2 | 2025 |
Source payment records
|
|||||
| ORALAIR Normalized: oralair |
Biological | Greer Laboratories, Inc. | $41.39 | 2 | 2025 |
Source payment records
|
|||||
| Rhapsido Normalized: rhapsido |
Drug | Novartis Pharmaceuticals Corporation | $39.40 | 2 | 2025 |
Source payment records
|
|||||
| VTAMA Normalized: vtama |
Drug | Organon LLC | $29.84 | 3 | 2025 |
Source payment records
|
|||||
| ORLADEYO Normalized: orladeyo |
Drug | BioCryst US Sales Co., LLC | $27.71 | 1 | 2025 |
Source payment records
|
|||||
| DAWNZERA Normalized: dawnzera |
Drug | Ionis Pharmaceuticals, Inc. | $26.19 | 1 | 2025 |
Source payment records
|
|||||
| TAKHZYRO Normalized: takhzyro |
Biological | Takeda Pharmaceuticals U.S.A., Inc. | $26.10 | 1 | 2025 |
Source payment records
|
|||||
| EBGLYSS Normalized: ebglyss |
Drug | Lilly USA, LLC | $25.35 | 1 | 2025 |
Source payment records
|
|||||
| TALTZ Normalized: taltz |
Drug | Lilly USA, LLC | $25.35 | 1 | 2025 |
Source payment records
|
|||||
| OPZELURA Normalized: opzelura |
Drug | Incyte Corporation | $22.25 | 1 | 2025 |
Source payment records
|
|||||
| TRELEGY ELLIPTA Normalized: trelegy ellipta |
Drug | GlaxoSmithKline, LLC. | $19.54 | 1 | 2025 |
Source payment records
|
|||||
| Xhance Normalized: xhance |
Drug | Optinose US, Inc. | $19.32 | 1 | 2025 |
Source payment records
|
|||||
* 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 |
|---|---|---|---|---|---|---|
| TRELEGY ELLIPTA trelegy ellipta |
2025 | Trelegy Ellipta | 2024 | 40 Beneficiary count suppressed |
exact normalized | Medicare Part D |
| XOLAIR xolair |
2025 | Xolair | 2024 | 31 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 |
|---|---|---|---|---|---|---|
| Genentech USA, Inc. Exact reporting entity; no affiliate inference |
2025 | Xolair open payments reported associated product |
CMS Open Payments — General Payments 11057 supporting records · 4008 recipient NPIs · example record 1211488440 |
Xolair · 2024 Exact normalized brand match · 1 Part D row |
31 | suppressed by CMS |
| GlaxoSmithKline, LLC. Exact reporting entity; no affiliate inference |
2025 | TRELEGY ELLIPTA open payments reported associated product |
CMS Open Payments — General Payments 131532 supporting records · 37148 recipient NPIs · example record 1190332369 |
Trelegy Ellipta · 2024 Exact normalized brand match · 1 Part D row |
40 | suppressed by CMS |
| Novartis Pharmaceuticals Corporation Exact reporting entity; no affiliate inference |
2025 | XOLAIR open payments reported associated product |
CMS Open Payments — General Payments 5293 supporting records · 2861 recipient NPIs · example record 1200005083 |
Xolair · 2024 Exact normalized brand match · 1 Part D row |
31 | 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 |
|---|---|---|---|
| Albuterol Sulfate Hfa | Albuterol Sulfate | 51 | 19 |
| Fluticasone Propionate | Fluticasone Propionate | 50 | 17 |
| Montelukast Sodium | Montelukast Sodium | 46 | 13 |
| Trelegy Ellipta | Fluticasone/Umeclidin/Vilanter | 40 | suppressed |
| Azelastine Hcl | Azelastine Hcl | 35 | 16 |
| Xolair | Omalizumab | 31 | suppressed |
| Breo Ellipta | Fluticasone/Vilanterol | 24 | suppressed |
| Fluticasone-Salmeterol | Fluticasone Propion/Salmeterol | 21 | suppressed |
| Hydroxyzine Hcl | Hydroxyzine Hcl | 19 | suppressed |
| Arnuity Ellipta | Fluticasone Furoate | 18 | suppressed |
| Azelastine-Fluticasone | Azelastine/Fluticasone | 16 | suppressed |
| Ipratropium Bromide | Ipratropium Bromide | 16 | suppressed |
| Levocetirizine Dihydrochloride | Levocetirizine Dihydrochloride | 16 | suppressed |
| Prednisone | Prednisone | 16 | suppressed |
| Gabapentin | Gabapentin | 15 | suppressed |
| Advair Hfa | Fluticasone Propion/Salmeterol | 12 | suppressed |
| Tacrolimus | Tacrolimus | 12 | 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 | $1,657.11 · 66 records | GENZYME CORPORATION | AIRSUPRA, AYVAKIT, CUVITRU, DAWNZERA, DUPIXENT, EBGLYSS, FASENRA, NEFFY, NEMLUVIO, NUCALA, OPZELURA, ORALAIR, ORLADEYO, Rhapsido, TAKHZYRO, TALTZ, TEZSPIRE, TRELEGY ELLIPTA, VTAMA, XOLAIR, Xembify, Xhance | 3 | — |
| 2024 | — | — | — | — | Complete |
Questions to ask
Questions you could discuss with your doctor
- What role, if any, does Trelegy Ellipta play in your treatment recommendations for me?
- How do you evaluate evidence when you have a financial relationship with Genentech USA, 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