Payment overview · 2025
General Payments
$23.53
1 reported records · 1 companies
Healthcare provider profile · identity verified
Duncan Chapman, MD
Allopathic & Osteopathic Physicians|Family Medicine · PORTAGE, MI · NPI 1437474152
Verified facts
What the public records show
CMS Open Payments records show Duncan Chapman, MD received $23.53 in general payments during 2025 across 1 reported records.
PFIZER INC. accounted for 100.0% of that reported general-payment amount.
The Open Payments records used for this analysis explicitly named 2 associated products.
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 46 claims for Eliquis 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 PAXLOVID as an associated drug or biological on 24465 records involving 15715 distinct recipient NPIs. Public Medicare Part D data also shows 17 claims for Paxlovid 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 |
|---|---|---|---|---|---|
| PFIZER INC. | Unresolved — no canonical attribution shown | $23.53 | 100.0% | 1 | 2025 |
What were the payments for?
Payment categories
| Category | Amount | Records |
|---|---|---|
| Food and Beverage | $23.53 | 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 |
|---|---|---|---|---|---|
| NURTEC ODT Normalized: nurtec odt |
Drug | PFIZER INC. | $23.53 | 1 | 2025 |
Source payment records
|
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| ZAVZPRET Normalized: zavzpret |
Drug | PFIZER INC. | $23.53 | 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
No exact normalized or approved-alias overlap was found in the loaded Part D year. This does not mean the doctor never prescribed the product.
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 | 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 |
46 | 17 |
| PFIZER INC. Exact reporting entity; no affiliate inference |
2025 | PAXLOVID open payments reported associated product |
CMS Open Payments — General Payments 24465 supporting records · 15715 recipient NPIs · example record 1228794432 |
Paxlovid · 2024 Exact normalized brand match · 1 Part D row |
17 | 17 |
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 | 1003 | 275 |
| Lisinopril | Lisinopril | 521 | 148 |
| Amlodipine Besylate | Amlodipine Besylate | 489 | 127 |
| Levothyroxine Sodium | Levothyroxine Sodium | 371 | 99 |
| Omeprazole | Omeprazole | 359 | 108 |
| Gabapentin | Gabapentin | 325 | 72 |
| Metoprolol Succinate | Metoprolol Succinate | 300 | 86 |
| Alprazolam | Alprazolam | 283 | 46 |
| Losartan Potassium | Losartan Potassium | 254 | 77 |
| Tamsulosin Hcl | Tamsulosin Hcl | 251 | 85 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 250 | 47 |
| Ezetimibe | Ezetimibe | 213 | 65 |
| Metformin Hcl | Metformin Hcl | 203 | 58 |
| Simvastatin | Simvastatin | 194 | 49 |
| Hydrochlorothiazide | Hydrochlorothiazide | 192 | 61 |
| Pravastatin Sodium | Pravastatin Sodium | 185 | 49 |
| Fluticasone Propionate | Fluticasone Propionate | 175 | 75 |
| Citalopram Hbr | Citalopram Hydrobromide | 158 | 50 |
| Trulicity | Dulaglutide | 140 | 31 |
| Pantoprazole Sodium | Pantoprazole Sodium | 133 | 46 |
| Metoprolol Tartrate | Metoprolol Tartrate | 128 | 40 |
| Tramadol Hcl | Tramadol Hcl | 125 | 20 |
| Jardiance | Empagliflozin | 114 | 28 |
| Alendronate Sodium | Alendronate Sodium | 110 | 36 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 109 | 47 |
| Pioglitazone Hcl | Pioglitazone Hcl | 106 | 29 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 106 | 34 |
| Allopurinol | Allopurinol | 101 | 29 |
| Trazodone Hcl | Trazodone Hcl | 89 | 28 |
| Repaglinide | Repaglinide | 86 | 22 |
| Baclofen | Baclofen | 82 | 32 |
| Atenolol | Atenolol | 80 | 19 |
| Lisinopril-Hydrochlorothiazide | Lisinopril/Hydrochlorothiazide | 80 | 23 |
| Azithromycin | Azithromycin | 79 | 66 |
| Zolpidem Tartrate | Zolpidem Tartrate | 79 | 13 |
| Farxiga | Dapagliflozin Propanediol | 77 | 18 |
| Oxycodone-Acetaminophen | Oxycodone Hcl/Acetaminophen | 74 | 12 |
| Montelukast Sodium | Montelukast Sodium | 73 | 23 |
| Glipizide | Glipizide | 66 | 17 |
| Finasteride | Finasteride | 65 | 18 |
| Carvedilol | Carvedilol | 64 | 17 |
| Fluoxetine Hcl | Fluoxetine Hcl | 64 | 19 |
| Mounjaro | Tirzepatide | 64 | suppressed |
| Duloxetine Hcl | Duloxetine Hcl | 60 | 21 |
| Celecoxib | Celecoxib | 59 | 18 |
| Furosemide | Furosemide | 57 | 18 |
| Azelastine Hcl | Azelastine Hcl | 55 | 23 |
| Januvia | Sitagliptin Phosphate | 55 | 11 |
| Potassium Chloride | Potassium Chloride | 52 | 16 |
| Escitalopram Oxalate | Escitalopram Oxalate | 51 | 20 |
| Sertraline Hcl | Sertraline Hcl | 49 | 15 |
| Amoxicillin-Clavulanate Potass | Amoxicillin/Potassium Clav | 47 | 37 |
| Eliquis | Apixaban | 46 | 17 |
| Hydralazine Hcl | Hydralazine Hcl | 46 | 14 |
| Triamcinolone Acetonide | Triamcinolone Acetonide | 45 | 32 |
| Donepezil Hcl | Donepezil Hcl | 41 | suppressed |
| Clopidogrel | Clopidogrel Bisulfate | 40 | 12 |
| Ciprofloxacin Hcl | Ciprofloxacin Hcl | 39 | 34 |
| Cyclobenzaprine Hcl | Cyclobenzaprine Hcl | 39 | 15 |
| Ventolin Hfa | Albuterol Sulfate | 38 | 18 |
| Triamterene-Hydrochlorothiazid | Triamterene/Hydrochlorothiazid | 37 | suppressed |
| Fenofibrate | Fenofibrate Nanocrystallized | 36 | 11 |
| Hydroxyzine Hcl | Hydroxyzine Hcl | 34 | 12 |
| Ondansetron Hcl | Ondansetron Hcl | 34 | 18 |
| Bupropion Hcl Sr | Bupropion Hcl | 33 | suppressed |
| Fentanyl | Fentanyl | 33 | suppressed |
| Famotidine | Famotidine | 32 | 11 |
| Losartan-Hydrochlorothiazide | Losartan/Hydrochlorothiazide | 32 | 11 |
| Lovastatin | Lovastatin | 32 | suppressed |
| Meclizine Hcl | Meclizine Hcl | 32 | 12 |
| Propranolol Hcl | Propranolol Hcl | 32 | suppressed |
| Lansoprazole | Lansoprazole | 31 | suppressed |
| Glipizide Er | Glipizide | 30 | suppressed |
| Ipratropium Bromide | Ipratropium Bromide | 30 | 17 |
| Xarelto | Rivaroxaban | 30 | suppressed |
| Irbesartan | Irbesartan | 29 | suppressed |
| Chlorthalidone | Chlorthalidone | 27 | suppressed |
| Lantus Solostar | Insulin Glargine,hum.Rec.Anlog | 27 | 12 |
| Buspirone Hcl | Buspirone Hcl | 26 | suppressed |
| Cephalexin | Cephalexin | 26 | 20 |
| Meloxicam | Meloxicam | 26 | 11 |
| Prednisone | Prednisone | 26 | 23 |
| Spironolactone | Spironolactone | 26 | suppressed |
| Bupropion Xl | Bupropion Hcl | 25 | suppressed |
| Metformin Hcl Er | Metformin Hcl | 25 | suppressed |
| Sumatriptan Succinate | Sumatriptan Succinate | 24 | suppressed |
| Amitriptyline Hcl | Amitriptyline Hcl | 23 | suppressed |
| Ozempic | Semaglutide | 23 | suppressed |
| Memantine Hcl | Memantine Hcl | 22 | suppressed |
| Symbicort | Budesonide/Formoterol Fumarate | 22 | suppressed |
| Fenofibrate | Fenofibrate | 21 | suppressed |
| Gemfibrozil | Gemfibrozil | 21 | suppressed |
| Glimepiride | Glimepiride | 20 | suppressed |
| Ibuprofen | Ibuprofen | 20 | 11 |
| Naproxen | Naproxen | 20 | suppressed |
| Trelegy Ellipta | Fluticasone/Umeclidin/Vilanter | 20 | suppressed |
| Ultra-Fine Short Pen Needle | Pen Needle, Diabetic | 20 | suppressed |
| Valsartan | Valsartan | 20 | suppressed |
| Budesonide-Formoterol Fumarate | Budesonide/Formoterol Fumarate | 19 | suppressed |
| Clonazepam | Clonazepam | 19 | suppressed |
| Estradiol | Estradiol | 19 | suppressed |
| Nifedipine Er | Nifedipine | 19 | suppressed |
| Tizanidine Hcl | Tizanidine Hcl | 19 | suppressed |
| Topiramate | Topiramate | 19 | suppressed |
| Tresiba Flextouch U-200 | Insulin Degludec | 19 | suppressed |
| Acetaminophen-Codeine | Acetaminophen With Codeine | 18 | suppressed |
| Nortriptyline Hcl | Nortriptyline Hcl | 18 | suppressed |
| Ropinirole Hcl | Ropinirole Hcl | 18 | suppressed |
| Amoxicillin | Amoxicillin | 17 | 16 |
| Dicyclomine Hcl | Dicyclomine Hcl | 17 | suppressed |
| Paxlovid | Nirmatrelvir/Ritonavir | 17 | 17 |
| Propranolol Hcl Er | Propranolol Hcl | 17 | suppressed |
| Doxycycline Monohydrate | Doxycycline Monohydrate | 16 | 11 |
| Esomeprazole Magnesium | Esomeprazole Magnesium | 16 | suppressed |
| Hydrocortisone | Hydrocortisone | 16 | suppressed |
| Isosorbide Mononitrate Er | Isosorbide Mononitrate | 16 | suppressed |
| Ketoconazole | Ketoconazole | 16 | suppressed |
| Myrbetriq | Mirabegron | 16 | suppressed |
| Oxybutynin Chloride Er | Oxybutynin Chloride | 16 | suppressed |
| Sildenafil Citrate | Sildenafil Citrate | 16 | suppressed |
| Torsemide | Torsemide | 16 | suppressed |
| Diltiazem 24hr Er (Cd) | Diltiazem Hcl | 15 | suppressed |
| Fluticasone-Salmeterol | Fluticasone Propion/Salmeterol | 15 | suppressed |
| Nitroglycerin | Nitroglycerin | 15 | 12 |
| Oxybutynin Chloride | Oxybutynin Chloride | 15 | suppressed |
| Atenolol-Chlorthalidone | Atenolol/Chlorthalidone | 14 | suppressed |
| Morphine Sulfate Er | Morphine Sulfate | 14 | suppressed |
| Pregabalin | Pregabalin | 14 | suppressed |
| Amlodipine Besylate-Benazepril | Amlodipine Besylate/Benazepril | 13 | suppressed |
| Betamethasone Valerate | Betamethasone Valerate | 13 | suppressed |
| Desvenlafaxine Succinate Er | Desvenlafaxine Succinate | 13 | suppressed |
| Enalapril Maleate | Enalapril Maleate | 13 | suppressed |
| Epinephrine | Epinephrine | 13 | suppressed |
| Fenofibrate | Fenofibrate,micronized | 13 | suppressed |
| Invokana | Canagliflozin | 13 | suppressed |
| Lantus | Insulin Glargine,hum.Rec.Anlog | 13 | suppressed |
| Mirtazapine | Mirtazapine | 13 | suppressed |
| Paroxetine Hcl | Paroxetine Hcl | 13 | suppressed |
| Tolterodine Tartrate Er | Tolterodine Tartrate | 13 | suppressed |
| Clonidine Hcl | Clonidine Hcl | 12 | suppressed |
| Diphenoxylate-Atropine | Diphenoxylate Hcl/Atropine | 12 | suppressed |
| Ibu | Ibuprofen | 12 | suppressed |
| Lorazepam | Lorazepam | 12 | suppressed |
| Methylphenidate Hcl | Methylphenidate Hcl | 12 | suppressed |
| Olmesartan Medoxomil | Olmesartan Medoxomil | 12 | suppressed |
| Acyclovir | Acyclovir | 11 | suppressed |
| Basaglar Kwikpen U-100 | Insulin Glargine,hum.Rec.Anlog | 11 | suppressed |
| Fludrocortisone Acetate | Fludrocortisone Acetate | 11 | suppressed |
| Oxazepam | Oxazepam | 11 | suppressed |
| Sulfamethoxazole-Trimethoprim | Sulfamethoxazole/Trimethoprim | 11 | 11 |
| Tramadol Hcl-Acetaminophen | Tramadol Hcl/Acetaminophen | 11 | suppressed |
| Valacyclovir | Valacyclovir Hcl | 11 | suppressed |
| Warfarin Sodium | Warfarin Sodium | 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 | $23.53 · 1 records | PFIZER INC. | NURTEC ODT, ZAVZPRET | 2 | — |
| 2024 | — | — | — | — | Complete |
Questions to ask
Questions you could discuss with your doctor
- 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