Payment overview · 2025
General Payments
$5,854.87
209 reported records · 16 companies
Healthcare provider profile · identity verified
David Dai Dang, M.D.
Allopathic & Osteopathic Physicians|Internal Medicine|Rheumatology · GARDEN GROVE, CA · NPI 1932162385
Verified facts
What the public records show
CMS Open Payments records show David Dai Dang, M.D. received $5,854.87 in general payments during 2025 across 209 reported records.
ABBVIE INC. accounted for 29.8% of that reported general-payment amount.
The Open Payments records used for this analysis explicitly named 26 associated products.
A separate comparison found the same explicitly named product in public Medicare Part D data: Creon, Enbrel, Kevzara, Linzess, Otezla, Prolia, Rinvoq, Xeljanz, Zenpep.
ABBVIE 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 CREON as an associated drug or biological on 91561 records involving 20616 distinct recipient NPIs. Public Medicare Part D data also shows 42 claims for Creon by this doctor in 2024.
ABBVIE 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 LINZESS as an associated drug or biological on 87954 records involving 21815 distinct recipient NPIs. Public Medicare Part D data also shows 33 claims for Linzess by this doctor in 2024.
ABBVIE 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 RINVOQ as an associated drug or biological on 279238 records involving 34343 distinct recipient NPIs. Public Medicare Part D data also shows 404 claims for Rinvoq by this doctor in 2024.
Aimmune Therapeutics, 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 ZENPEP as an associated drug or biological on 32144 records involving 12432 distinct recipient NPIs. Public Medicare Part D data also shows 97 claims for Zenpep by this doctor in 2024.
Amgen 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 ENBREL as an associated drug or biological on 9330 records involving 2094 distinct recipient NPIs. Public Medicare Part D data also shows 13 claims for Enbrel by this doctor in 2024.
Amgen 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 OTEZLA as an associated drug or biological on 177267 records involving 48600 distinct recipient NPIs. Public Medicare Part D data also shows 36 claims for Otezla by this doctor in 2024.
Amgen 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 PROLIA as an associated drug or biological on 20867 records involving 11744 distinct recipient NPIs. Public Medicare Part D data also shows 244 claims for Prolia by this doctor in 2024.
GENZYME 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 KEVZARA as an associated drug or biological on 5840 records involving 2002 distinct recipient NPIs. Public Medicare Part D data also shows 149 claims for Kevzara by this doctor in 2024.
Janssen Biotech, 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 SIMPONI as an associated drug or biological on 23185 records involving 7011 distinct recipient NPIs. Public Medicare Part D data also shows 18 claims for Simponi by this doctor in 2024.
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 XELJANZ as an associated drug or biological on 32588 records involving 8614 distinct recipient NPIs. Public Medicare Part D data also shows 18 claims for Xeljanz by this doctor in 2024.
SANOFI-AVENTIS U.S. 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 KEVZARA as an associated drug or biological on 83 records involving 83 distinct recipient NPIs. Public Medicare Part D data also shows 149 claims for Kevzara 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 |
|---|---|---|---|---|---|
| ABBVIE INC. | Unresolved — no canonical attribution shown | $1,742.86 | 29.8% | 63 | 2025 |
| Amgen Inc. | Unresolved — no canonical attribution shown | $945.58 | 16.1% | 36 | 2025 |
| GENZYME CORPORATION | Unresolved — no canonical attribution shown | $679.31 | 11.6% | 14 | 2025 |
| Janssen Biotech, Inc. | Unresolved — no canonical attribution shown | $614.52 | 10.5% | 19 | 2025 |
| Aimmune Therapeutics, Inc. | Unresolved — no canonical attribution shown | $422.70 | 7.2% | 26 | 2025 |
| Novartis Pharmaceuticals Corporation | Unresolved — no canonical attribution shown | $343.19 | 5.9% | 15 | 2025 |
| Lilly USA, LLC | Unresolved — no canonical attribution shown | $318.99 | 5.5% | 13 | 2025 |
| PFIZER INC. | Unresolved — no canonical attribution shown | $291.92 | 5.0% | 11 | 2025 |
| UCB, Inc. | Unresolved — no canonical attribution shown | $165.84 | 2.8% | 2 | 2025 |
| SANOFI-AVENTIS U.S. LLC | Unresolved — no canonical attribution shown | $88.60 | 1.5% | 1 | 2025 |
| ANI Pharmaceuticals, Inc. | Unresolved — no canonical attribution shown | $63.45 | 1.1% | 2 | 2025 |
| AstraZeneca Pharmaceuticals LP | Unresolved — no canonical attribution shown | $52.93 | 0.9% | 2 | 2025 |
| E.R. Squibb & Sons, L.L.C. | Unresolved — no canonical attribution shown | $48.94 | 0.8% | 2 | 2025 |
| Fresenius Kabi USA, LLC | Unresolved — no canonical attribution shown | $28.40 | 0.5% | 1 | 2025 |
| Radius Health, Inc. | Unresolved — no canonical attribution shown | $26.61 | 0.5% | 1 | 2025 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | Unresolved — no canonical attribution shown | $21.03 | 0.4% | 1 | 2025 |
What were the payments for?
Payment categories
| Category | Amount | Records |
|---|---|---|
| Food and Beverage | $5,766.27 | 208 |
| Education | $88.60 | 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 |
|---|---|---|---|---|---|
| RINVOQ Normalized: rinvoq |
Biological | ABBVIE INC. | $1,032.97 | 36 | 2025 |
Source payment records
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| KEVZARA Normalized: kevzara |
Biological | GENZYME CORPORATION, SANOFI-AVENTIS U.S. LLC | $767.91 | 15 | 2025 |
Source payment records
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| TREMFYA Normalized: tremfya |
Drug | Janssen Biotech, Inc. | $614.52 | 19 | 2025 |
Source payment records
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| SKYRIZI Normalized: skyrizi |
Biological | ABBVIE INC. | $471.49 | 16 | 2025 |
Source payment records
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| ZENPEP Normalized: zenpep |
Drug | Aimmune Therapeutics, Inc. | $422.70 | 26 | 2025 |
Source payment records
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| OTEZLA Normalized: otezla |
Drug | Amgen Inc. | $413.81 | 15 | 2025 |
Source payment records
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| COSENTYX Normalized: cosentyx |
Drug | Novartis Pharmaceuticals Corporation | $343.19 | 15 | 2025 |
Source payment records
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| TALTZ Normalized: taltz |
Drug | Lilly USA, LLC | $293.86 | 12 | 2025 |
Source payment records
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| XELJANZ Normalized: xeljanz |
Drug | PFIZER INC. | $291.92 | 11 | 2025 |
Source payment records
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| ZEPBOUND Normalized: zepbound |
Drug | Lilly USA, LLC | $254.75 | 10 | 2025 |
Source payment records
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| CREON Normalized: creon |
Drug | ABBVIE INC. | $219.42 | 10 | 2025 |
Source payment records
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| LINZESS Normalized: linzess |
Drug | ABBVIE INC. | $188.68 | 9 | 2025 |
Source payment records
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| EVENITY Normalized: evenity |
Biological | Amgen Inc. | $169.36 | 11 | 2025 |
Source payment records
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| Bimzelx Normalized: bimzelx |
Biological | UCB, Inc. | $165.84 | 2 | 2025 |
Source payment records
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| ENBREL Normalized: enbrel |
Biological | Amgen Inc. | $165.41 | 6 | 2025 |
Source payment records
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| SIMPONI ARIA Normalized: simponi aria |
Biological | Janssen Biotech, Inc. | $144.75 | 1 | 2025 |
Source payment records
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| UPLIZNA Normalized: uplizna |
Biological | Amgen Inc. | $132.27 | 5 | 2025 |
Source payment records
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| PURIFIED CORTROPHIN GEL Normalized: purified cortrophin gel |
Drug | ANI Pharmaceuticals, Inc. | $63.45 | 2 | 2025 |
Source payment records
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| TAVNEOS Normalized: tavneos |
Drug | Amgen Inc. | $55.90 | 2 | 2025 |
Source payment records
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| SAPHNELO Normalized: saphnelo |
Biological | AstraZeneca Pharmaceuticals LP | $52.93 | 2 | 2025 |
Source payment records
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| ORENCIA Normalized: orencia |
Biological | E.R. Squibb & Sons, L.L.C. | $48.94 | 2 | 2025 |
Source payment records
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| Tymlos Normalized: tymlos |
Drug | Radius Health, Inc. | $26.61 | 1 | 2025 |
Source payment records
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| PROLIA Normalized: prolia |
Biological | Amgen Inc. | $21.83 | 1 | 2025 |
Source payment records
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| OFEV Normalized: ofev |
Drug | Boehringer Ingelheim Pharmaceuticals, Inc. | $21.03 | 1 | 2025 |
Source payment records
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| BOTOX Normalized: botox |
Biological | ABBVIE INC. | $18.98 | 1 | 2025 |
Source payment records
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| QULIPTA Normalized: qulipta |
Drug | ABBVIE INC. | $18.98 | 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 |
|---|---|---|---|---|---|---|
| CREON creon |
2025 | Creon | 2024 | 42 | exact normalized | Medicare Part D |
| ENBREL enbrel |
2025 | Enbrel | 2024 | 13 Beneficiary count suppressed |
exact normalized | Medicare Part D |
| KEVZARA kevzara |
2025 | Kevzara | 2024 | 149 | exact normalized | Medicare Part D |
| LINZESS linzess |
2025 | Linzess | 2024 | 33 Beneficiary count suppressed |
exact normalized | Medicare Part D |
| OTEZLA otezla |
2025 | Otezla | 2024 | 36 Beneficiary count suppressed |
exact normalized | Medicare Part D |
| PROLIA prolia |
2025 | Prolia | 2024 | 244 | exact normalized | Medicare Part D |
| RINVOQ rinvoq |
2025 | Rinvoq | 2024 | 404 | exact normalized | Medicare Part D |
| XELJANZ xeljanz |
2025 | Xeljanz | 2024 | 18 Beneficiary count suppressed |
exact normalized | Medicare Part D |
| ZENPEP zenpep |
2025 | Zenpep | 2024 | 97 | 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 |
|---|---|---|---|---|---|---|
| ABBVIE INC. Exact reporting entity; no affiliate inference |
2025 | CREON open payments reported associated product |
CMS Open Payments — General Payments 91561 supporting records · 20616 recipient NPIs · example record 1201352608 |
Creon · 2024 Exact normalized brand match · 1 Part D row |
42 | 14 |
| ABBVIE INC. Exact reporting entity; no affiliate inference |
2025 | LINZESS open payments reported associated product |
CMS Open Payments — General Payments 87954 supporting records · 21815 recipient NPIs · example record 1201352608 |
Linzess · 2024 Exact normalized brand match · 1 Part D row |
33 | suppressed by CMS |
| ABBVIE INC. Exact reporting entity; no affiliate inference |
2025 | RINVOQ open payments reported associated product |
CMS Open Payments — General Payments 279238 supporting records · 34343 recipient NPIs · example record 1201352600 |
Rinvoq · 2024 Exact normalized brand match · 1 Part D row |
404 | 43 |
| Aimmune Therapeutics, Inc. Exact reporting entity; no affiliate inference |
2025 | ZENPEP open payments reported associated product |
CMS Open Payments — General Payments 32144 supporting records · 12432 recipient NPIs · example record 1249641927 |
Zenpep · 2024 Exact normalized brand match · 1 Part D row |
97 | 19 |
| Amgen Inc. Exact reporting entity; no affiliate inference |
2025 | ENBREL open payments reported associated product |
CMS Open Payments — General Payments 9330 supporting records · 2094 recipient NPIs · example record 1226877474 |
Enbrel · 2024 Exact normalized brand match · 1 Part D row |
13 | suppressed by CMS |
| Amgen Inc. Exact reporting entity; no affiliate inference |
2025 | OTEZLA open payments reported associated product |
CMS Open Payments — General Payments 177267 supporting records · 48600 recipient NPIs · example record 1226871616 |
Otezla · 2024 Exact normalized brand match · 1 Part D row |
36 | suppressed by CMS |
| Amgen Inc. Exact reporting entity; no affiliate inference |
2025 | PROLIA open payments reported associated product |
CMS Open Payments — General Payments 20867 supporting records · 11744 recipient NPIs · example record 1226874448 |
Prolia · 2024 Exact normalized brand match · 1 Part D row |
244 | 136 |
| GENZYME CORPORATION Exact reporting entity; no affiliate inference |
2025 | KEVZARA open payments reported associated product |
CMS Open Payments — General Payments 5840 supporting records · 2002 recipient NPIs · example record 1233195032 |
Kevzara · 2024 Exact normalized brand match · 1 Part D row |
149 | 16 |
| Janssen Biotech, Inc. Exact reporting entity; no affiliate inference |
2025 | SIMPONI open payments reported associated product |
CMS Open Payments — General Payments 23185 supporting records · 7011 recipient NPIs · example record 1174257377 |
Simponi · 2024 Exact normalized brand match · 1 Part D row |
18 | suppressed by CMS |
| PFIZER INC. Exact reporting entity; no affiliate inference |
2025 | XELJANZ open payments reported associated product |
CMS Open Payments — General Payments 32588 supporting records · 8614 recipient NPIs · example record 1228794176 |
Xeljanz · 2024 Exact normalized brand match · 1 Part D row |
18 | suppressed by CMS |
| SANOFI-AVENTIS U.S. LLC Exact reporting entity; no affiliate inference |
2025 | KEVZARA open payments reported associated product |
CMS Open Payments — General Payments 83 supporting records · 83 recipient NPIs · example record 1233198104 |
Kevzara · 2024 Exact normalized brand match · 1 Part D row |
149 | 16 |
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 |
|---|---|---|---|
| Gabapentin | Gabapentin | 1101 | 275 |
| Celecoxib | Celecoxib | 920 | 214 |
| Famotidine | Famotidine | 818 | 273 |
| Tramadol Hcl | Tramadol Hcl | 641 | 161 |
| Methotrexate | Methotrexate Sodium | 505 | 69 |
| Diclofenac Sodium | Diclofenac Sodium | 409 | 94 |
| Rinvoq | Upadacitinib | 404 | 43 |
| Hydroxychloroquine Sulfate | Hydroxychloroquine Sulfate | 402 | 94 |
| Enbrel Sureclick | Etanercept | 372 | 39 |
| Allopurinol | Allopurinol | 307 | 88 |
| Tizanidine Hcl | Tizanidine Hcl | 277 | 71 |
| Alendronate Sodium | Alendronate Sodium | 272 | 58 |
| Prolia | Denosumab | 244 | 136 |
| Ibuprofen | Ibuprofen | 212 | 73 |
| Prednisone | Prednisone | 200 | 67 |
| Meloxicam | Meloxicam | 173 | 62 |
| Pregabalin | Pregabalin | 155 | 28 |
| Humira(Cf) Pen | Adalimumab | 150 | 15 |
| Kevzara | Sarilumab | 149 | 16 |
| Sulfasalazine | Sulfasalazine | 145 | 34 |
| Leucovorin Calcium | Leucovorin Calcium | 139 | 19 |
| Azathioprine | Azathioprine | 129 | 27 |
| Acetaminophen-Codeine | Acetaminophen With Codeine | 123 | 34 |
| Triamcinolone Acetonide | Triamcinolone Acetonide | 114 | 57 |
| Naproxen | Naproxen | 107 | 37 |
| Colchicine | Colchicine | 102 | 33 |
| Xeljanz Xr | Tofacitinib Citrate | 97 | 13 |
| Zenpep | Lipase/Protease/Amylase | 97 | 19 |
| Zolpidem Tartrate | Zolpidem Tartrate | 95 | 30 |
| Cyclobenzaprine Hcl | Cyclobenzaprine Hcl | 81 | 28 |
| Lidocaine | Lidocaine | 78 | 17 |
| Pilocarpine Hcl | Pilocarpine Hcl | 73 | 22 |
| Taltz Autoinjector | Ixekizumab | 69 | suppressed |
| Baclofen | Baclofen | 59 | 15 |
| Cimzia (2 Pack) | Certolizumab Pegol | 46 | suppressed |
| Humira Pen | Adalimumab | 46 | suppressed |
| Piroxicam | Piroxicam | 44 | 11 |
| Creon | Lipase/Protease/Amylase | 42 | 14 |
| Mycophenolate Mofetil | Mycophenolate Mofetil | 40 | suppressed |
| Otezla | Apremilast | 36 | suppressed |
| Linzess | Linaclotide | 33 | suppressed |
| Folic Acid | Folic Acid | 32 | suppressed |
| Alprazolam | Alprazolam | 26 | suppressed |
| Ibu | Ibuprofen | 24 | suppressed |
| Mometasone Furoate | Mometasone Furoate | 24 | suppressed |
| Febuxostat | Febuxostat | 22 | suppressed |
| Evenity (2 Syringes) | Romosozumab-Aqqg | 19 | suppressed |
| Simponi | Golimumab | 18 | suppressed |
| Xeljanz | Tofacitinib Citrate | 18 | suppressed |
| Enbrel Mini | Etanercept | 17 | suppressed |
| Lorazepam | Lorazepam | 17 | suppressed |
| Mitigare | Colchicine | 16 | suppressed |
| Omeprazole | Omeprazole | 16 | suppressed |
| Duloxetine Hcl | Duloxetine Hcl | 15 | suppressed |
| Skyrizi Pen | Risankizumab-Rzaa | 14 | suppressed |
| Diclofenac Epolamine | Diclofenac Epolamine | 13 | suppressed |
| Enbrel | Etanercept | 13 | suppressed |
| Ropinirole Hcl | Ropinirole Hcl | 13 | suppressed |
| Actemra Actpen | Tocilizumab | 12 | suppressed |
| Benlysta | Belimumab | 12 | suppressed |
| Clotrimazole-Betamethasone | Clotrimazole/Betamethasone Dip | 12 | suppressed |
| Fluoxetine Hcl | Fluoxetine Hcl | 12 | suppressed |
| Sulfasalazine Dr | Sulfasalazine | 12 | suppressed |
| Betamethasone Dipropionate | Betamethasone Dipropionate | 11 | suppressed |
| Nitro-Bid | Nitroglycerin | 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 | $5,854.87 · 209 records | ABBVIE INC. | BOTOX, Bimzelx, COSENTYX, CREON, ENBREL, EVENITY, KEVZARA, LINZESS, OFEV, ORENCIA, OTEZLA, PROLIA, PURIFIED CORTROPHIN GEL, QULIPTA, RINVOQ, SAPHNELO, SIMPONI ARIA, SKYRIZI, TALTZ, TAVNEOS, TREMFYA, Tymlos, UPLIZNA, XELJANZ, ZENPEP, ZEPBOUND | 11 | — |
| 2024 | — | — | — | — | Complete |
Questions to ask
Questions you could discuss with your doctor
- What role, if any, does Creon play in your treatment recommendations for me?
- How do you evaluate evidence when you have a financial relationship with ABBVIE 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