Payment overview · 2025
General Payments
$24.58
1 reported records · 1 companies
Healthcare provider profile · identity verified
Allen J Hamaker, MD
Allopathic & Osteopathic Physicians|Internal Medicine · OKC, OK · NPI 1326028663
Verified facts
What the public records show
CMS Open Payments records show Allen J Hamaker, MD received $24.58 in general payments during 2025 across 1 reported records.
Amgen Inc. accounted for 100.0% of that reported general-payment amount.
The Open Payments records used for this analysis explicitly named 1 associated product.
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 | $24.58 | 100.0% | 1 | 2025 |
What were the payments for?
Payment categories
| Category | Amount | Records |
|---|---|---|
| Food and Beverage | $24.58 | 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 |
|---|---|---|---|---|---|
| REPATHA Normalized: repatha |
Biological | Amgen Inc. | $24.58 | 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 |
|---|---|---|---|
| Rosuvastatin Calcium | Rosuvastatin Calcium | 248 | 69 |
| Levothyroxine Sodium | Levothyroxine Sodium | 147 | 40 |
| Amlodipine Besylate | Amlodipine Besylate | 121 | 36 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 121 | 18 |
| Atorvastatin Calcium | Atorvastatin Calcium | 118 | 32 |
| Lisinopril | Lisinopril | 97 | 29 |
| Metoprolol Succinate | Metoprolol Succinate | 86 | 21 |
| Furosemide | Furosemide | 81 | 24 |
| Eliquis | Apixaban | 65 | 12 |
| Gabapentin | Gabapentin | 63 | 17 |
| Metformin Hcl Er | Metformin Hcl | 60 | 19 |
| Losartan Potassium | Losartan Potassium | 58 | 20 |
| Pantoprazole Sodium | Pantoprazole Sodium | 57 | 21 |
| Tramadol Hcl | Tramadol Hcl | 54 | suppressed |
| Clopidogrel | Clopidogrel Bisulfate | 53 | suppressed |
| Oxycodone-Acetaminophen | Oxycodone Hcl/Acetaminophen | 52 | suppressed |
| Omeprazole | Omeprazole | 51 | 11 |
| Potassium Chloride | Potassium Chloride | 51 | 20 |
| Celecoxib | Celecoxib | 49 | 18 |
| Fluticasone Propionate | Fluticasone Propionate | 47 | 14 |
| Metoprolol Tartrate | Metoprolol Tartrate | 46 | suppressed |
| Ezetimibe | Ezetimibe | 45 | 16 |
| Pioglitazone Hcl | Pioglitazone Hcl | 45 | 13 |
| Oxycodone Hcl | Oxycodone Hcl | 40 | suppressed |
| Trazodone Hcl | Trazodone Hcl | 40 | suppressed |
| Trulicity | Dulaglutide | 40 | suppressed |
| Escitalopram Oxalate | Escitalopram Oxalate | 37 | suppressed |
| Ozempic | Semaglutide | 37 | suppressed |
| Diclofenac Sodium | Diclofenac Sodium | 35 | suppressed |
| Famotidine | Famotidine | 35 | suppressed |
| Alprazolam | Alprazolam | 34 | suppressed |
| Duloxetine Hcl | Duloxetine Hcl | 33 | suppressed |
| Hydrochlorothiazide | Hydrochlorothiazide | 33 | 11 |
| Hydroxyzine Hcl | Hydroxyzine Hcl | 30 | suppressed |
| Temazepam | Temazepam | 30 | suppressed |
| Montelukast Sodium | Montelukast Sodium | 29 | 11 |
| Torsemide | Torsemide | 29 | suppressed |
| Zolpidem Tartrate | Zolpidem Tartrate | 29 | suppressed |
| Linzess | Linaclotide | 28 | suppressed |
| Tamsulosin Hcl | Tamsulosin Hcl | 28 | suppressed |
| Acetaminophen-Codeine | Acetaminophen With Codeine | 27 | suppressed |
| Alendronate Sodium | Alendronate Sodium | 26 | suppressed |
| Pregabalin | Pregabalin | 26 | suppressed |
| Lisinopril-Hydrochlorothiazide | Lisinopril/Hydrochlorothiazide | 25 | suppressed |
| Hydralazine Hcl | Hydralazine Hcl | 24 | suppressed |
| Hydromorphone Hcl | Hydromorphone Hcl | 24 | suppressed |
| Modafinil | Modafinil | 24 | suppressed |
| Nebivolol Hcl | Nebivolol Hcl | 24 | suppressed |
| Benazepril Hcl | Benazepril Hcl | 23 | suppressed |
| Ondansetron Odt | Ondansetron | 23 | 14 |
| Allopurinol | Allopurinol | 22 | suppressed |
| Amoxicillin-Clavulanate Potass | Amoxicillin/Potassium Clav | 22 | 17 |
| Jardiance | Empagliflozin | 22 | suppressed |
| Paroxetine Hcl | Paroxetine Hcl | 22 | suppressed |
| Warfarin Sodium | Warfarin Sodium | 21 | suppressed |
| Atenolol | Atenolol | 20 | suppressed |
| Meloxicam | Meloxicam | 20 | suppressed |
| Metaxalone | Metaxalone | 20 | suppressed |
| Diltiazem 24hr Er (Cd) | Diltiazem Hcl | 19 | suppressed |
| Fluoxetine Hcl | Fluoxetine Hcl | 19 | suppressed |
| Liothyronine Sodium | Liothyronine Sodium | 19 | suppressed |
| Ramipril | Ramipril | 19 | suppressed |
| Synthroid | Levothyroxine Sodium | 19 | suppressed |
| Azelastine Hcl | Azelastine Hcl | 18 | suppressed |
| Metformin Hcl | Metformin Hcl | 18 | suppressed |
| Pravastatin Sodium | Pravastatin Sodium | 18 | suppressed |
| Butalbital-Acetaminophen-Caffe | Butalb/Acetaminophen/Caffeine | 17 | suppressed |
| Memantine Hcl | Memantine Hcl | 17 | suppressed |
| Trelegy Ellipta | Fluticasone/Umeclidin/Vilanter | 17 | suppressed |
| Xarelto | Rivaroxaban | 17 | suppressed |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 16 | suppressed |
| Amitriptyline Hcl | Amitriptyline Hcl | 16 | suppressed |
| Cyclobenzaprine Hcl | Cyclobenzaprine Hcl | 16 | suppressed |
| Esomeprazole Magnesium | Esomeprazole Magnesium | 16 | suppressed |
| Eszopiclone | Eszopiclone | 16 | suppressed |
| Jantoven | Warfarin Sodium | 16 | suppressed |
| Amlodipine-Valsartan | Amlodipine Besylate/Valsartan | 15 | suppressed |
| Bupropion Xl | Bupropion Hcl | 15 | suppressed |
| Ciprofloxacin Hcl | Ciprofloxacin Hcl | 15 | suppressed |
| Finasteride | Finasteride | 15 | suppressed |
| Levetiracetam | Levetiracetam | 15 | suppressed |
| Methylprednisolone | Methylprednisolone | 15 | 13 |
| Repatha Sureclick | Evolocumab | 15 | suppressed |
| Synjardy Xr | Empagliflozin/Metformin Hcl | 15 | suppressed |
| Topiramate | Topiramate | 15 | suppressed |
| Carvedilol | Carvedilol | 14 | suppressed |
| Cefuroxime | Cefuroxime Axetil | 14 | 12 |
| Digoxin | Digoxin | 14 | suppressed |
| Doxazosin Mesylate | Doxazosin Mesylate | 14 | suppressed |
| Glimepiride | Glimepiride | 14 | suppressed |
| Sertraline Hcl | Sertraline Hcl | 14 | suppressed |
| Venlafaxine Hcl Er | Venlafaxine Hcl | 14 | suppressed |
| Chlorthalidone | Chlorthalidone | 13 | suppressed |
| Lorazepam | Lorazepam | 13 | suppressed |
| Oxycontin | Oxycodone Hcl | 13 | suppressed |
| Hydroxychloroquine Sulfate | Hydroxychloroquine Sulfate | 12 | suppressed |
| Morphine Sulfate Er | Morphine Sulfate | 12 | suppressed |
| Naproxen | Naproxen | 12 | suppressed |
| Nifedipine Er | Nifedipine | 12 | suppressed |
| Promethazine Hcl | Promethazine Hcl | 12 | suppressed |
| Roflumilast | Roflumilast | 12 | suppressed |
| Amlodipine Besylate-Benazepril | Amlodipine Besylate/Benazepril | 11 | suppressed |
| Citalopram Hbr | Citalopram Hydrobromide | 11 | suppressed |
| Donepezil Hcl | Donepezil Hcl | 11 | suppressed |
| Fenofibrate | Fenofibrate | 11 | suppressed |
| Ipratropium Bromide | Ipratropium Bromide | 11 | suppressed |
| Quetiapine Fumarate | Quetiapine Fumarate | 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 | $24.58 · 1 records | Amgen Inc. | REPATHA | — | — |
| 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