Payment overview · 2025
General Payments
We did not find matching Open Payments records for this doctor in the selected program year.
Healthcare provider profile · identity verified
Michael Palchak, M.D.
Emergency Medicine · DAVIS, CA · NPI 1316970338
Verified facts
What the public records show
We did not find matching Open Payments records for this doctor in 2025.
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.
Analysis 1 · Payment-linked products
Products named in Open Payments records
No payment-linked product analysis is available because no matching General Payment records were found for the selected year.
Public prescribing for products named in payments
There is no explicit payment-product set available for a Part D comparison.
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.
There is no payer-company set available for this comparison.
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 | 274 | 33 |
| Levothyroxine Sodium | Levothyroxine Sodium | 165 | 19 |
| Losartan Potassium | Losartan Potassium | 148 | 21 |
| Furosemide | Furosemide | 126 | 20 |
| Donepezil Hcl | Donepezil Hcl | 113 | 11 |
| Amlodipine Besylate | Amlodipine Besylate | 104 | 14 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 97 | 68 |
| Gabapentin | Gabapentin | 96 | 12 |
| Metformin Hcl | Metformin Hcl | 95 | 11 |
| Omeprazole | Omeprazole | 92 | suppressed |
| Quetiapine Fumarate | Quetiapine Fumarate | 89 | 11 |
| Famotidine | Famotidine | 72 | 18 |
| Lisinopril | Lisinopril | 69 | 11 |
| Risperidone | Risperidone | 69 | 13 |
| Cephalexin | Cephalexin | 65 | 49 |
| Trazodone Hcl | Trazodone Hcl | 65 | suppressed |
| Pantoprazole Sodium | Pantoprazole Sodium | 61 | suppressed |
| Potassium Chloride | Potassium Chloride | 61 | suppressed |
| Eliquis | Apixaban | 60 | 12 |
| Tamsulosin Hcl | Tamsulosin Hcl | 59 | suppressed |
| Carvedilol | Carvedilol | 54 | suppressed |
| Ezetimibe | Ezetimibe | 49 | suppressed |
| Prednisone | Prednisone | 47 | 41 |
| Memantine Hcl | Memantine Hcl | 45 | suppressed |
| Isosorbide Mononitrate Er | Isosorbide Mononitrate | 44 | suppressed |
| Loperamide | Loperamide Hcl | 40 | 22 |
| Metoprolol Tartrate | Metoprolol Tartrate | 38 | suppressed |
| Ondansetron Odt | Ondansetron | 38 | 36 |
| Lantus Solostar | Insulin Glargine,hum.Rec.Anlog | 37 | suppressed |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 35 | 21 |
| Allopurinol | Allopurinol | 35 | suppressed |
| Sertraline Hcl | Sertraline Hcl | 34 | suppressed |
| Ibuprofen | Ibuprofen | 32 | 32 |
| Oxybutynin Chloride Er | Oxybutynin Chloride | 31 | suppressed |
| Breo Ellipta | Fluticasone/Vilanterol | 30 | suppressed |
| Januvia | Sitagliptin Phosphate | 30 | suppressed |
| Jardiance | Empagliflozin | 30 | suppressed |
| Fluoxetine Hcl | Fluoxetine Hcl | 28 | suppressed |
| Alcohol Swab | Alcohol Antiseptic Pads | 27 | suppressed |
| Myrbetriq | Mirabegron | 27 | suppressed |
| Oxybutynin Chloride | Oxybutynin Chloride | 27 | suppressed |
| Metoprolol Succinate | Metoprolol Succinate | 26 | suppressed |
| Insulin Lispro Kwikpen U-100 | Insulin Lispro | 25 | suppressed |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 25 | suppressed |
| Armour Thyroid | Thyroid,pork | 24 | suppressed |
| Buspirone Hcl | Buspirone Hcl | 24 | suppressed |
| Ondansetron Hcl | Ondansetron Hcl | 24 | 17 |
| Bupropion Xl | Bupropion Hcl | 23 | suppressed |
| Doxepin Hcl | Doxepin Hcl | 22 | suppressed |
| Montelukast Sodium | Montelukast Sodium | 22 | suppressed |
| Sulfamethoxazole-Trimethoprim | Sulfamethoxazole/Trimethoprim | 22 | 15 |
| Benazepril Hcl | Benazepril Hcl | 21 | suppressed |
| Citalopram Hbr | Citalopram Hydrobromide | 21 | suppressed |
| Divalproex Sodium | Divalproex Sodium | 21 | suppressed |
| Tramadol Hcl | Tramadol Hcl | 21 | 14 |
| Doxycycline Hyclate | Doxycycline Hyclate | 20 | 20 |
| Hydrocortisone | Hydrocortisone | 20 | suppressed |
| Nitrofurantoin Mono-Macro | Nitrofurantoin Monohyd/M-Cryst | 20 | suppressed |
| Phenobarbital | Phenobarbital | 20 | suppressed |
| Basaglar Kwikpen U-100 | Insulin Glargine,hum.Rec.Anlog | 19 | suppressed |
| Carbidopa-Levodopa | Carbidopa/Levodopa | 19 | suppressed |
| Levetiracetam | Levetiracetam | 19 | suppressed |
| Spironolactone | Spironolactone | 19 | suppressed |
| Amoxicillin-Clavulanate Potass | Amoxicillin/Potassium Clav | 18 | 16 |
| Calcitriol | Calcitriol | 18 | suppressed |
| Pregabalin | Pregabalin | 18 | suppressed |
| Lactulose | Lactulose | 17 | suppressed |
| Olanzapine | Olanzapine | 16 | suppressed |
| Hydrochlorothiazide | Hydrochlorothiazide | 15 | suppressed |
| Ciprofloxacin Hcl | Ciprofloxacin Hcl | 14 | 13 |
| Hydroxyzine Hcl | Hydroxyzine Hcl | 14 | suppressed |
| Lorazepam | Lorazepam | 14 | suppressed |
| Zaleplon | Zaleplon | 14 | suppressed |
| Amitriptyline Hcl | Amitriptyline Hcl | 13 | suppressed |
| Bumetanide | Bumetanide | 13 | suppressed |
| Buprenorphine-Naloxone | Buprenorphine Hcl/Naloxone Hcl | 13 | suppressed |
| Diltiazem 24hr Er (Cd) | Diltiazem Hcl | 13 | suppressed |
| Fluticasone Propionate | Fluticasone Propionate | 13 | suppressed |
| Gemfibrozil | Gemfibrozil | 13 | suppressed |
| Nystop | Nystatin | 13 | suppressed |
| Alfuzosin Hcl Er | Alfuzosin Hcl | 12 | suppressed |
| Anastrozole | Anastrozole | 12 | suppressed |
| Autoshield Duo Pen Needle | Pen Needle,dual Safety,diabetc | 12 | suppressed |
| Clopidogrel | Clopidogrel Bisulfate | 12 | suppressed |
| Diltiazem Hcl | Diltiazem Hcl | 12 | suppressed |
| Divalproex Sodium Er | Divalproex Sodium | 12 | suppressed |
| Dutasteride | Dutasteride | 12 | suppressed |
| Enalapril Maleate | Enalapril Maleate | 12 | suppressed |
| Fenofibrate | Fenofibrate | 12 | suppressed |
| Lubiprostone | Lubiprostone | 12 | suppressed |
| Memantine Hcl Er | Memantine Hcl | 12 | suppressed |
| Nifedipine Er | Nifedipine | 12 | suppressed |
| Pramipexole Dihydrochloride | Pramipexole Di-Hcl | 12 | suppressed |
| Trueplus Insulin Syringe | Syringe-Needle,insulin,0.5 Ml | 12 | suppressed |
| Dilt-Xr | Diltiazem Hcl | 11 | suppressed |
| Icosapent Ethyl | Icosapent Ethyl | 11 | suppressed |
| Nebivolol Hcl | Nebivolol Hcl | 11 | suppressed |
| Oxycodone-Acetaminophen | Oxycodone Hcl/Acetaminophen | 11 | 11 |
| Ozempic | Semaglutide | 11 | suppressed |
| Synthroid | Levothyroxine 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 | — | — | — | — | — |
| 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