Payment overview · 2025
General Payments
$66.48
3 reported records · 3 companies
Healthcare provider profile · identity verified
David Knowlton, MD
Allopathic & Osteopathic Physicians|Family Medicine · SPRINGFIELD, OR · NPI 1902975741
Verified facts
What the public records show
CMS Open Payments records show David Knowlton, MD received $66.48 in general payments during 2025 across 3 reported records.
Amgen Inc. accounted for 48.5% of that reported general-payment amount.
The Open Payments records used for this analysis explicitly named 5 associated products.
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 |
|---|---|---|---|---|---|
| Amgen Inc. | Unresolved — no canonical attribution shown | $32.25 | 48.5% | 1 | 2025 |
| Hologic Sales and Service, LLC | Unresolved — no canonical attribution shown | $20.00 | 30.1% | 1 | 2025 |
| Sumitomo Pharma America, Inc. | Unresolved — no canonical attribution shown | $14.23 | 21.4% | 1 | 2025 |
What were the payments for?
Payment categories
| Category | Amount | Records |
|---|---|---|
| Food and Beverage | $66.48 | 3 |
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 |
|---|---|---|---|---|---|
| OTEZLA Normalized: otezla |
Drug | Amgen Inc. | $32.25 | 1 | 2025 |
Source payment records
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| REPATHA Normalized: repatha |
Biological | Amgen Inc. | $32.25 | 1 | 2025 |
Source payment records
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| APTIMA Normalized: aptima |
Device | Hologic Sales and Service, LLC | $20.00 | 1 | 2025 |
Source payment records
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| THINPREP 2000 PROCESSOR Normalized: thinprep 2000 processor |
Device | Hologic Sales and Service, LLC | $20.00 | 1 | 2025 |
Source payment records
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| GEMTESA Normalized: gemtesa |
Drug | Sumitomo Pharma America, Inc. | $14.23 | 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.
No publishable same-company prescribing overlap was found in the loaded Part D year. This does not mean the doctor never prescribed a drug reported elsewhere by a paying company.
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 |
|---|---|---|---|
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 257 | 30 |
| Atorvastatin Calcium | Atorvastatin Calcium | 246 | 74 |
| Levothyroxine Sodium | Levothyroxine Sodium | 232 | 60 |
| Gabapentin | Gabapentin | 215 | 51 |
| Lisinopril | Lisinopril | 212 | 64 |
| Omeprazole | Omeprazole | 171 | 44 |
| Tamsulosin Hcl | Tamsulosin Hcl | 143 | 40 |
| Amlodipine Besylate | Amlodipine Besylate | 137 | 41 |
| Losartan Potassium | Losartan Potassium | 134 | 35 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 128 | 45 |
| Oxycodone Hcl | Oxycodone Hcl | 123 | 22 |
| Metformin Hcl | Metformin Hcl | 121 | 34 |
| Alprazolam | Alprazolam | 112 | 19 |
| Metoprolol Tartrate | Metoprolol Tartrate | 104 | 21 |
| Carvedilol | Carvedilol | 103 | 32 |
| Trazodone Hcl | Trazodone Hcl | 98 | 23 |
| Zolpidem Tartrate | Zolpidem Tartrate | 93 | 15 |
| Furosemide | Furosemide | 90 | 23 |
| Hydrochlorothiazide | Hydrochlorothiazide | 88 | 24 |
| Montelukast Sodium | Montelukast Sodium | 84 | 18 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 80 | 22 |
| Tramadol Hcl | Tramadol Hcl | 80 | suppressed |
| Simvastatin | Simvastatin | 77 | 22 |
| Sertraline Hcl | Sertraline Hcl | 71 | 18 |
| Metformin Hcl Er | Metformin Hcl | 70 | 15 |
| Citalopram Hbr | Citalopram Hydrobromide | 67 | 20 |
| Metoprolol Succinate | Metoprolol Succinate | 66 | 21 |
| Spironolactone | Spironolactone | 60 | 18 |
| Eliquis | Apixaban | 57 | 18 |
| Lorazepam | Lorazepam | 57 | suppressed |
| Cyclobenzaprine Hcl | Cyclobenzaprine Hcl | 55 | 22 |
| Allopurinol | Allopurinol | 53 | 15 |
| Pantoprazole Sodium | Pantoprazole Sodium | 53 | 19 |
| Atenolol | Atenolol | 52 | 15 |
| Oxycodone-Acetaminophen | Oxycodone Hcl/Acetaminophen | 52 | suppressed |
| Warfarin Sodium | Warfarin Sodium | 52 | suppressed |
| Duloxetine Hcl | Duloxetine Hcl | 51 | 13 |
| Buprenorphine-Naloxone | Buprenorphine Hcl/Naloxone Hcl | 50 | suppressed |
| Potassium Chloride | Potassium Chloride | 50 | 12 |
| Ozempic | Semaglutide | 47 | suppressed |
| Lovastatin | Lovastatin | 46 | suppressed |
| Lisinopril-Hydrochlorothiazide | Lisinopril/Hydrochlorothiazide | 45 | 13 |
| Pravastatin Sodium | Pravastatin Sodium | 41 | 14 |
| Testosterone Cypionate | Testosterone Cypionate | 40 | 11 |
| Amitriptyline Hcl | Amitriptyline Hcl | 39 | suppressed |
| Irbesartan | Irbesartan | 38 | suppressed |
| Bupropion Xl | Bupropion Hcl | 36 | suppressed |
| Tizanidine Hcl | Tizanidine Hcl | 36 | 12 |
| Glimepiride | Glimepiride | 35 | suppressed |
| Lantus Solostar | Insulin Glargine,hum.Rec.Anlog | 35 | suppressed |
| Pioglitazone Hcl | Pioglitazone Hcl | 34 | suppressed |
| Ezetimibe | Ezetimibe | 33 | suppressed |
| Ibuprofen | Ibuprofen | 33 | 11 |
| Jardiance | Empagliflozin | 32 | 11 |
| Alendronate Sodium | Alendronate Sodium | 31 | suppressed |
| Triamcinolone Acetonide | Triamcinolone Acetonide | 31 | 19 |
| Buspirone Hcl | Buspirone Hcl | 30 | suppressed |
| Lamotrigine | Lamotrigine | 30 | suppressed |
| Estradiol | Estradiol | 28 | suppressed |
| Fluoxetine Hcl | Fluoxetine Hcl | 28 | 11 |
| Prednisone | Prednisone | 28 | 12 |
| Meloxicam | Meloxicam | 27 | suppressed |
| Baclofen | Baclofen | 26 | suppressed |
| Clopidogrel | Clopidogrel Bisulfate | 26 | suppressed |
| Mirtazapine | Mirtazapine | 26 | suppressed |
| Propranolol Hcl | Propranolol Hcl | 26 | suppressed |
| Torsemide | Torsemide | 26 | suppressed |
| Clonazepam | Clonazepam | 25 | suppressed |
| Sumatriptan Succinate | Sumatriptan Succinate | 25 | suppressed |
| Mupirocin | Mupirocin | 24 | suppressed |
| Clonidine Hcl | Clonidine Hcl | 22 | suppressed |
| Glipizide | Glipizide | 22 | suppressed |
| Hydroxyzine Hcl | Hydroxyzine Hcl | 22 | suppressed |
| Xarelto | Rivaroxaban | 22 | suppressed |
| Diclofenac Sodium | Diclofenac Sodium | 21 | suppressed |
| Januvia | Sitagliptin Phosphate | 21 | suppressed |
| Quetiapine Fumarate | Quetiapine Fumarate | 21 | suppressed |
| Terbinafine Hcl | Terbinafine Hcl | 21 | suppressed |
| Spiriva Handihaler | Tiotropium Bromide | 20 | suppressed |
| Venlafaxine Hcl Er | Venlafaxine Hcl | 20 | suppressed |
| Cephalexin | Cephalexin | 19 | suppressed |
| Levetiracetam | Levetiracetam | 19 | suppressed |
| Solifenacin Succinate | Solifenacin Succinate | 19 | suppressed |
| Temazepam | Temazepam | 19 | suppressed |
| Fluticasone Propionate | Fluticasone Propionate | 18 | suppressed |
| Fluticasone-Salmeterol | Fluticasone Propion/Salmeterol | 18 | suppressed |
| Ondansetron Hcl | Ondansetron Hcl | 18 | suppressed |
| Diazepam | Diazepam | 17 | suppressed |
| Pramipexole Dihydrochloride | Pramipexole Di-Hcl | 17 | suppressed |
| Risperidone | Risperidone | 17 | suppressed |
| Azithromycin | Azithromycin | 16 | 11 |
| Celecoxib | Celecoxib | 16 | suppressed |
| Escitalopram Oxalate | Escitalopram Oxalate | 16 | suppressed |
| Morphine Sulfate Er | Morphine Sulfate | 16 | suppressed |
| Oxybutynin Chloride | Oxybutynin Chloride | 16 | suppressed |
| Ropinirole Hcl | Ropinirole Hcl | 16 | suppressed |
| Divalproex Sodium | Divalproex Sodium | 15 | suppressed |
| Famotidine | Famotidine | 15 | suppressed |
| Methocarbamol | Methocarbamol | 15 | suppressed |
| Promethazine Hcl | Promethazine Hcl | 15 | suppressed |
| Advair Hfa | Fluticasone Propion/Salmeterol | 14 | suppressed |
| Diltiazem 24hr Er (Cd) | Diltiazem Hcl | 14 | suppressed |
| Valsartan | Valsartan | 14 | suppressed |
| Venlafaxine Hcl | Venlafaxine Hcl | 14 | suppressed |
| Dextroamphetamine-Amphet Er | Dextroamphetamine/Amphetamine | 13 | suppressed |
| Latanoprost | Latanoprost | 13 | suppressed |
| Losartan-Hydrochlorothiazide | Losartan/Hydrochlorothiazide | 13 | suppressed |
| Naproxen | Naproxen | 13 | suppressed |
| Varenicline Tartrate | Varenicline Tartrate | 13 | suppressed |
| Buprenorphine Hcl | Buprenorphine Hcl | 12 | suppressed |
| Dicyclomine Hcl | Dicyclomine Hcl | 12 | suppressed |
| Estazolam | Estazolam | 12 | suppressed |
| Isosorbide Mononitrate Er | Isosorbide Mononitrate | 12 | suppressed |
| Sulfamethoxazole-Trimethoprim | Sulfamethoxazole/Trimethoprim | 12 | suppressed |
| Benazepril Hcl | Benazepril Hcl | 11 | suppressed |
| Hydrocortisone | Hydrocortisone | 11 | suppressed |
| Nystatin | Nystatin | 11 | suppressed |
| Tramadol Hcl-Acetaminophen | Tramadol Hcl/Acetaminophen | 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 | $66.48 · 3 records | Amgen Inc. | APTIMA, GEMTESA, OTEZLA, REPATHA, THINPREP 2000 PROCESSOR | — | — |
| 2024 | — | — | — | — | Complete |
Questions to ask
Questions you could discuss with your doctor
- 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