Payment overview · 2025
General Payments
$313.42
18 reported records · 10 companies
Healthcare provider profile · identity verified
Robert A Chang, MD
Allopathic & Osteopathic Physicians|Internal Medicine · MOUNT CLEMENS, MI · NPI 1093712093
Verified facts
What the public records show
CMS Open Payments records show Robert A Chang, MD received $313.42 in general payments during 2025 across 18 reported records.
Aimmune Therapeutics, Inc. accounted for 24.1% of that reported general-payment amount.
The Open Payments records used for this analysis explicitly named 15 associated products.
A separate comparison found the same explicitly named product in public Medicare Part D data: Mounjaro.
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 49 claims for Trelegy Ellipta by this doctor in 2024.
Lilly USA, 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 JARDIANCE as an associated drug or biological on 47708 records involving 23833 distinct recipient NPIs. Public Medicare Part D data also shows 78 claims for Jardiance by this doctor in 2024.
Lilly USA, 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 MOUNJARO as an associated drug or biological on 186719 records involving 66436 distinct recipient NPIs. Public Medicare Part D data also shows 44 claims for Mounjaro by this doctor in 2024.
Lilly USA, 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 TRULICITY as an associated drug or biological on 71 records involving 57 distinct recipient NPIs. Public Medicare Part D data also shows 42 claims for Trulicity by this doctor in 2024.
Novo Nordisk 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 Ozempic as an associated drug or biological on 261625 records involving 77793 distinct recipient NPIs. Public Medicare Part D data also shows 54 claims for Ozempic by this doctor in 2024.
Novo Nordisk 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 Rybelsus as an associated drug or biological on 161257 records involving 55409 distinct recipient NPIs. Public Medicare Part D data also shows 26 claims for Rybelsus 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 ELIQUIS as an associated drug or biological on 87112 records involving 36032 distinct recipient NPIs. Public Medicare Part D data also shows 158 claims for Eliquis 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 |
|---|---|---|---|---|---|
| Aimmune Therapeutics, Inc. | Unresolved — no canonical attribution shown | $75.50 | 24.1% | 4 | 2025 |
| PFIZER INC. | Unresolved — no canonical attribution shown | $46.52 | 14.8% | 2 | 2025 |
| Amgen Inc. | Unresolved — no canonical attribution shown | $44.57 | 14.2% | 3 | 2025 |
| Novo Nordisk Inc | Unresolved — no canonical attribution shown | $34.70 | 11.1% | 2 | 2025 |
| GlaxoSmithKline, LLC. | Unresolved — no canonical attribution shown | $32.55 | 10.4% | 2 | 2025 |
| Boston Scientific Corporation | Unresolved — no canonical attribution shown | $18.42 | 5.9% | 1 | 2025 |
| AstraZeneca Pharmaceuticals LP | Unresolved — no canonical attribution shown | $17.00 | 5.4% | 1 | 2025 |
| Exact Sciences Corporation | Unresolved — no canonical attribution shown | $15.94 | 5.1% | 1 | 2025 |
| Abbott Laboratories | Unresolved — no canonical attribution shown | $14.73 | 4.7% | 1 | 2025 |
| Lilly USA, LLC | Unresolved — no canonical attribution shown | $13.49 | 4.3% | 1 | 2025 |
What were the payments for?
Payment categories
| Category | Amount | Records |
|---|---|---|
| Food and Beverage | $313.42 | 18 |
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 |
|---|---|---|---|---|---|
| ZENPEP Normalized: zenpep |
Drug | Aimmune Therapeutics, Inc. | $75.50 | 4 | 2025 |
Source payment records
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| REPATHA Normalized: repatha |
Biological | Amgen Inc. | $44.57 | 3 | 2025 |
Source payment records
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| SHINGRIX Normalized: shingrix |
Biological | GlaxoSmithKline, LLC. | $32.55 | 2 | 2025 |
Source payment records
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| OTEZLA Normalized: otezla |
Drug | Amgen Inc. | $29.57 | 2 | 2025 |
Source payment records
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| ABRYSVO Normalized: abrysvo |
Biological | PFIZER INC. | $24.98 | 1 | 2025 |
Source payment records
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| COMIRNATY Normalized: comirnaty |
Biological | PFIZER INC. | $24.98 | 1 | 2025 |
Source payment records
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| PREVNAR 20 Normalized: prevnar 20 |
Biological | PFIZER INC. | $24.98 | 1 | 2025 |
Source payment records
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| VYNDAQEL Normalized: vyndaqel |
Drug | PFIZER INC. | $21.54 | 1 | 2025 |
Source payment records
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| WATCHMAN FLX Normalized: watchman flx |
Device | Boston Scientific Corporation | $18.42 | 1 | 2025 |
Source payment records
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| BREZTRI Normalized: breztri |
Drug | AstraZeneca Pharmaceuticals LP | $17.00 | 1 | 2025 |
Source payment records
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| Cologuard Collection Kit Normalized: cologuard collection kit |
Device | Exact Sciences Corporation | $15.94 | 1 | 2025 |
Source payment records
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| Wegovy Normalized: wegovy |
Drug | Novo Nordisk Inc | $14.97 | 1 | 2025 |
Source payment records
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| FREESTYLE LIBRE 3 Normalized: freestyle libre 3 |
Device | Abbott Laboratories | $14.73 | 1 | 2025 |
Source payment records
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| MOUNJARO Normalized: mounjaro |
Drug | Lilly USA, LLC | $13.49 | 1 | 2025 |
Source payment records
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| ZEPBOUND Normalized: zepbound |
Drug | Lilly USA, LLC | $13.49 | 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 |
|---|---|---|---|---|---|---|
| MOUNJARO mounjaro |
2025 | Mounjaro | 2024 | 44 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 |
|---|---|---|---|---|---|---|
| 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 |
49 | 15 |
| Lilly USA, LLC Exact reporting entity; no affiliate inference |
2025 | JARDIANCE open payments reported associated product |
CMS Open Payments — General Payments 47708 supporting records · 23833 recipient NPIs · example record 1186464557 |
Jardiance · 2024 Exact normalized brand match · 1 Part D row |
78 | 25 |
| Lilly USA, LLC Exact reporting entity; no affiliate inference |
2025 | MOUNJARO open payments reported associated product |
CMS Open Payments — General Payments 186719 supporting records · 66436 recipient NPIs · example record 1186464455 |
Mounjaro · 2024 Exact normalized brand match · 1 Part D row |
44 | suppressed by CMS |
| Lilly USA, LLC Exact reporting entity; no affiliate inference |
2025 | TRULICITY open payments reported associated product |
CMS Open Payments — General Payments 71 supporting records · 57 recipient NPIs · example record 1186464601 |
Trulicity · 2024 Exact normalized brand match · 1 Part D row |
42 | suppressed by CMS |
| Novo Nordisk Inc Exact reporting entity; no affiliate inference |
2025 | Ozempic open payments reported associated product |
CMS Open Payments — General Payments 261625 supporting records · 77793 recipient NPIs · example record 1188130076 |
Ozempic · 2024 Exact normalized brand match · 1 Part D row |
54 | 14 |
| Novo Nordisk Inc Exact reporting entity; no affiliate inference |
2025 | Rybelsus open payments reported associated product |
CMS Open Payments — General Payments 161257 supporting records · 55409 recipient NPIs · example record 1188130076 |
Rybelsus · 2024 Exact normalized brand match · 1 Part D row |
26 | suppressed by CMS |
| PFIZER INC. Exact reporting entity; no affiliate inference |
2025 | ELIQUIS open payments reported associated product |
CMS Open Payments — General Payments 87112 supporting records · 36032 recipient NPIs · example record 1228794063 |
Eliquis · 2024 Exact normalized brand match · 1 Part D row |
158 | 46 |
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 | 700 | 196 |
| Levothyroxine Sodium | Levothyroxine Sodium | 671 | 161 |
| Losartan Potassium | Losartan Potassium | 544 | 156 |
| Amlodipine Besylate | Amlodipine Besylate | 431 | 122 |
| Metoprolol Succinate | Metoprolol Succinate | 383 | 101 |
| Lisinopril | Lisinopril | 293 | 90 |
| Omeprazole | Omeprazole | 276 | 83 |
| Metformin Hcl | Metformin Hcl | 271 | 79 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 266 | 44 |
| Hydrochlorothiazide | Hydrochlorothiazide | 258 | 74 |
| Metoprolol Tartrate | Metoprolol Tartrate | 216 | 62 |
| Simvastatin | Simvastatin | 197 | 58 |
| Alprazolam | Alprazolam | 178 | 46 |
| Gabapentin | Gabapentin | 174 | 40 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 166 | 45 |
| Furosemide | Furosemide | 159 | 44 |
| Tamsulosin Hcl | Tamsulosin Hcl | 159 | 48 |
| Eliquis | Apixaban | 158 | 46 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 148 | 46 |
| Duloxetine Hcl | Duloxetine Hcl | 146 | 30 |
| Carvedilol | Carvedilol | 125 | 38 |
| Pantoprazole Sodium | Pantoprazole Sodium | 106 | 39 |
| Potassium Chloride | Potassium Chloride | 105 | 34 |
| Metformin Hcl Er | Metformin Hcl | 102 | 29 |
| Trazodone Hcl | Trazodone Hcl | 102 | 35 |
| Famotidine | Famotidine | 97 | 29 |
| Fluticasone Propionate | Fluticasone Propionate | 95 | 43 |
| Zolpidem Tartrate | Zolpidem Tartrate | 92 | 27 |
| Xarelto | Rivaroxaban | 91 | 22 |
| Allopurinol | Allopurinol | 90 | 24 |
| Tramadol Hcl | Tramadol Hcl | 90 | 27 |
| Ezetimibe | Ezetimibe | 88 | 21 |
| Oxycodone-Acetaminophen | Oxycodone Hcl/Acetaminophen | 85 | 14 |
| Glimepiride | Glimepiride | 84 | 24 |
| Montelukast Sodium | Montelukast Sodium | 84 | 25 |
| Pravastatin Sodium | Pravastatin Sodium | 84 | 24 |
| Ibuprofen | Ibuprofen | 83 | 17 |
| Pregabalin | Pregabalin | 81 | 20 |
| Torsemide | Torsemide | 79 | 28 |
| Jardiance | Empagliflozin | 78 | 25 |
| Meloxicam | Meloxicam | 76 | 22 |
| Alendronate Sodium | Alendronate Sodium | 75 | 23 |
| Cyclobenzaprine Hcl | Cyclobenzaprine Hcl | 75 | 16 |
| Hydralazine Hcl | Hydralazine Hcl | 75 | 21 |
| Atenolol | Atenolol | 73 | 22 |
| Sertraline Hcl | Sertraline Hcl | 73 | 23 |
| Citalopram Hbr | Citalopram Hydrobromide | 69 | 18 |
| Nifedipine Er | Nifedipine | 69 | 17 |
| Spironolactone | Spironolactone | 68 | 20 |
| Methocarbamol | Methocarbamol | 67 | 28 |
| Clopidogrel | Clopidogrel Bisulfate | 66 | 19 |
| Escitalopram Oxalate | Escitalopram Oxalate | 61 | 23 |
| Diazepam | Diazepam | 57 | 15 |
| Donepezil Hcl | Donepezil Hcl | 56 | 13 |
| Ozempic | Semaglutide | 54 | 14 |
| Trelegy Ellipta | Fluticasone/Umeclidin/Vilanter | 49 | 15 |
| Baclofen | Baclofen | 44 | 11 |
| Mounjaro | Tirzepatide | 44 | suppressed |
| Diltiazem 24hr Er (Cd) | Diltiazem Hcl | 42 | 14 |
| Lantus Solostar | Insulin Glargine,hum.Rec.Anlog | 42 | 14 |
| Trulicity | Dulaglutide | 42 | suppressed |
| Methylprednisolone | Methylprednisolone | 41 | 37 |
| Losartan-Hydrochlorothiazide | Losartan/Hydrochlorothiazide | 39 | 12 |
| Mirtazapine | Mirtazapine | 39 | 13 |
| Benazepril Hcl | Benazepril Hcl | 35 | suppressed |
| Fenofibrate | Fenofibrate | 35 | 12 |
| Januvia | Sitagliptin Phosphate | 35 | 11 |
| Isosorbide Mononitrate Er | Isosorbide Mononitrate | 34 | suppressed |
| Lansoprazole | Lansoprazole | 34 | suppressed |
| Temazepam | Temazepam | 34 | suppressed |
| Memantine Hcl | Memantine Hcl | 33 | suppressed |
| Synthroid | Levothyroxine Sodium | 33 | 11 |
| Ventolin Hfa | Albuterol Sulfate | 33 | 11 |
| Warfarin Sodium | Warfarin Sodium | 33 | 11 |
| Glipizide Er | Glipizide | 31 | suppressed |
| Pioglitazone Hcl | Pioglitazone Hcl | 31 | suppressed |
| Bupropion Xl | Bupropion Hcl | 30 | suppressed |
| Clonazepam | Clonazepam | 29 | suppressed |
| Finasteride | Finasteride | 29 | suppressed |
| Lovastatin | Lovastatin | 29 | suppressed |
| Solifenacin Succinate | Solifenacin Succinate | 29 | suppressed |
| Triamterene-Hydrochlorothiazid | Triamterene/Hydrochlorothiazid | 29 | suppressed |
| Anoro Ellipta | Umeclidinium Brm/Vilanterol Tr | 28 | suppressed |
| Celecoxib | Celecoxib | 28 | suppressed |
| Lorazepam | Lorazepam | 28 | 11 |
| Amoxicillin-Clavulanate Potass | Amoxicillin/Potassium Clav | 27 | 23 |
| Azelastine Hcl | Azelastine Hcl | 26 | 12 |
| Repatha Sureclick | Evolocumab | 26 | suppressed |
| Rybelsus | Semaglutide | 26 | suppressed |
| Janumet | Sitagliptin Phos/Metformin Hcl | 25 | suppressed |
| Azithromycin | Azithromycin | 24 | 22 |
| Glipizide | Glipizide | 24 | suppressed |
| Tizanidine Hcl | Tizanidine Hcl | 24 | 12 |
| Dextroamphetamine-Amphetamine | Dextroamphetamine/Amphetamine | 23 | suppressed |
| Diclofenac Sodium | Diclofenac Sodium | 23 | suppressed |
| Nitrofurantoin Mono-Macro | Nitrofurantoin Monohyd/M-Cryst | 22 | 21 |
| Nitroglycerin | Nitroglycerin | 22 | 15 |
| Aripiprazole | Aripiprazole | 21 | suppressed |
| Breo Ellipta | Fluticasone/Vilanterol | 21 | suppressed |
| Ipratropium Bromide | Ipratropium Bromide | 21 | suppressed |
| Oxybutynin Chloride Er | Oxybutynin Chloride | 21 | suppressed |
| Meclizine Hcl | Meclizine Hcl | 20 | 14 |
| Ondansetron Hcl | Ondansetron Hcl | 20 | 13 |
| Varenicline Tartrate | Varenicline Tartrate | 20 | suppressed |
| Bupropion Hcl Sr | Bupropion Hcl | 19 | suppressed |
| Clonidine Hcl | Clonidine Hcl | 19 | suppressed |
| Buspirone Hcl | Buspirone Hcl | 18 | suppressed |
| Dextroamphetamine-Amphet Er | Dextroamphetamine/Amphetamine | 17 | suppressed |
| Fluoxetine Hcl | Fluoxetine Hcl | 17 | suppressed |
| Galantamine Hbr | Galantamine Hbr | 17 | suppressed |
| Ropinirole Hcl | Ropinirole Hcl | 17 | suppressed |
| Amitriptyline Hcl | Amitriptyline Hcl | 16 | suppressed |
| Amoxicillin | Amoxicillin | 16 | 13 |
| Fenofibrate | Fenofibrate Nanocrystallized | 16 | suppressed |
| Cephalexin | Cephalexin | 15 | suppressed |
| Colchicine | Colchicine | 15 | suppressed |
| Doxazosin Mesylate | Doxazosin Mesylate | 15 | suppressed |
| Lisinopril-Hydrochlorothiazide | Lisinopril/Hydrochlorothiazide | 15 | suppressed |
| Omega-3 Acid Ethyl Esters | Omega-3 Acid Ethyl Esters | 15 | suppressed |
| Quetiapine Fumarate | Quetiapine Fumarate | 15 | suppressed |
| Sulfamethoxazole-Trimethoprim | Sulfamethoxazole/Trimethoprim | 15 | 13 |
| Ultra-Fine Short Pen Needle | Pen Needle, Diabetic | 15 | suppressed |
| Valsartan | Valsartan | 15 | suppressed |
| Acyclovir | Acyclovir | 14 | suppressed |
| Digoxin | Digoxin | 14 | suppressed |
| Nano 2nd Gen Pen Needle | Pen Needle, Diabetic | 14 | suppressed |
| Tramadol Hcl-Acetaminophen | Tramadol Hcl/Acetaminophen | 14 | suppressed |
| Valacyclovir | Valacyclovir Hcl | 14 | suppressed |
| Amiodarone Hcl | Amiodarone Hcl | 13 | suppressed |
| Belsomra | Suvorexant | 13 | suppressed |
| Oxybutynin Chloride | Oxybutynin Chloride | 13 | suppressed |
| Acetaminophen-Codeine | Acetaminophen With Codeine | 12 | suppressed |
| Diclofenac Sodium-Misoprostol | Diclofenac Sodium/Misoprostol | 12 | suppressed |
| Enalapril Maleate | Enalapril Maleate | 12 | suppressed |
| Oxycodone Hcl | Oxycodone Hcl | 12 | suppressed |
| Terazosin Hcl | Terazosin Hcl | 12 | suppressed |
| Klor-Con M20 | Potassium Chloride | 11 | suppressed |
| Verapamil Er | Verapamil 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 | $313.42 · 18 records | Aimmune Therapeutics, Inc. | ABRYSVO, BREZTRI, COMIRNATY, Cologuard Collection Kit, FREESTYLE LIBRE 3, MOUNJARO, OTEZLA, PREVNAR 20, REPATHA, SHINGRIX, VYNDAQEL, WATCHMAN FLX, Wegovy, ZENPEP, ZEPBOUND | 7 | — |
| 2024 | — | — | — | — | Complete |
Questions to ask
Questions you could discuss with your doctor
- What role, if any, does Mounjaro play in your treatment recommendations for me?
- How do you evaluate evidence when you have a financial relationship with GlaxoSmithKline, LLC.?
- 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