Payment overview · 2025
General Payments
$935.57
42 reported records · 8 companies
Healthcare provider profile · identity verified
Judith Ann Hahn, NP
Physician Assistants & Advanced Practice Nursing Providers|Nurse Practitioner|Psychiatric/Mental Health · PHOENIX, AZ · NPI 1700974581
Verified facts
What the public records show
CMS Open Payments records show Judith Ann Hahn, NP received $935.57 in general payments during 2025 across 42 reported records.
Lundbeck LLC accounted for 25.8% of that reported general-payment amount.
The Open Payments records used for this analysis explicitly named 9 associated products.
A separate comparison found the same explicitly named product in public Medicare Part D data: Aristada, Austedo Xr, Caplyta, Fanapt, Ingrezza, Lybalvi, Rexulti, Vraylar.
ABBVIE 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 VRAYLAR as an associated drug or biological on 377741 records involving 62704 distinct recipient NPIs. Public Medicare Part D data also shows 46 claims for Vraylar by this doctor in 2024.
Alkermes, 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 ARISTADA as an associated drug or biological on 76041 records involving 17486 distinct recipient NPIs. Public Medicare Part D data also shows 23 claims for Aristada by this doctor in 2024.
Alkermes, 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 LYBALVI as an associated drug or biological on 93784 records involving 20135 distinct recipient NPIs. Public Medicare Part D data also shows 71 claims for Lybalvi by this doctor in 2024.
ITI, Inc. (d/b/a Intra-Cellular Therapies, 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 CAPLYTA as an associated drug or biological on 211855 records involving 46143 distinct recipient NPIs. Public Medicare Part D data also shows 74 claims for Caplyta by this doctor in 2024.
Lundbeck 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 ABILIFY MAINTENA as an associated drug or biological on 2902 records involving 986 distinct recipient NPIs. Public Medicare Part D data also shows 13 claims for Abilify Maintena by this doctor in 2024.
Lundbeck 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 REXULTI as an associated drug or biological on 71829 records involving 25812 distinct recipient NPIs. Public Medicare Part D data also shows 239 claims for Rexulti by this doctor in 2024.
Neurocrine BioSciences, 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 INGREZZA as an associated drug or biological on 126456 records involving 27390 distinct recipient NPIs. Public Medicare Part D data also shows 65 claims for Ingrezza by this doctor in 2024.
Otsuka America Pharmaceutical, 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 ABILIFY MAINTENA as an associated drug or biological on 27924 records involving 10497 distinct recipient NPIs. Public Medicare Part D data also shows 13 claims for Abilify Maintena by this doctor in 2024.
Otsuka America Pharmaceutical, 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 NUEDEXTA as an associated drug or biological on 393 records involving 285 distinct recipient NPIs. Public Medicare Part D data also shows 57 claims for Nuedexta by this doctor in 2024.
Otsuka America Pharmaceutical, 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 REXULTI as an associated drug or biological on 160756 records involving 46288 distinct recipient NPIs. Public Medicare Part D data also shows 239 claims for Rexulti by this doctor in 2024.
Teva Pharmaceuticals USA, 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 AUSTEDO as an associated drug or biological on 28 records involving 15 distinct recipient NPIs. Public Medicare Part D data also shows 17 claims for Austedo by this doctor in 2024.
Teva Pharmaceuticals USA, 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 AUSTEDO XR as an associated drug or biological on 86263 records involving 23643 distinct recipient NPIs. Public Medicare Part D data also shows 38 claims for Austedo Xr by this doctor in 2024.
Vanda Pharmaceuticals 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 FANAPT as an associated drug or biological on 95605 records involving 21383 distinct recipient NPIs. Public Medicare Part D data also shows 36 claims for Fanapt 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 |
|---|---|---|---|---|---|
| Lundbeck LLC | Unresolved — no canonical attribution shown | $241.41 | 25.8% | 16 | 2025 |
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) | Unresolved — no canonical attribution shown | $189.73 | 20.3% | 8 | 2025 |
| Neurocrine BioSciences, Inc. | Unresolved — no canonical attribution shown | $148.49 | 15.9% | 5 | 2025 |
| Teva Pharmaceuticals USA, Inc. | Unresolved — no canonical attribution shown | $127.83 | 13.7% | 3 | 2025 |
| Alkermes, Inc. | Unresolved — no canonical attribution shown | $102.75 | 11.0% | 4 | 2025 |
| Vanda Pharmaceuticals Inc. | Unresolved — no canonical attribution shown | $57.74 | 6.2% | 2 | 2025 |
| ABBVIE INC. | Unresolved — no canonical attribution shown | $45.04 | 4.8% | 3 | 2025 |
| Otsuka America Pharmaceutical, Inc. | Unresolved — no canonical attribution shown | $22.58 | 2.4% | 1 | 2025 |
What were the payments for?
Payment categories
| Category | Amount | Records |
|---|---|---|
| Food and Beverage | $860.07 | 41 |
| Education | $75.50 | 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 |
|---|---|---|---|---|---|
| REXULTI Normalized: rexulti |
Drug | Lundbeck LLC, Otsuka America Pharmaceutical, Inc. | $263.99 | 17 | 2025 |
Source payment records
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| CAPLYTA Normalized: caplyta |
Drug | ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) | $189.73 | 8 | 2025 |
Source payment records
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| INGREZZA Normalized: ingrezza |
Drug | Neurocrine BioSciences, Inc. | $148.49 | 5 | 2025 |
Source payment records
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| LYBALVI Normalized: lybalvi |
Drug | Alkermes, Inc. | $102.75 | 4 | 2025 |
Source payment records
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| FANAPT Normalized: fanapt |
Drug | Vanda Pharmaceuticals Inc. | $57.74 | 2 | 2025 |
Source payment records
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| AUSTEDO XR Normalized: austedo xr |
Drug | Teva Pharmaceuticals USA, Inc. | $52.33 | 2 | 2025 |
Source payment records
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| ARISTADA Normalized: aristada |
Drug | Alkermes, Inc. | $49.98 | 2 | 2025 |
Source payment records
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| VRAYLAR Normalized: vraylar |
Drug | ABBVIE INC. | $45.04 | 3 | 2025 |
Source payment records
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| HETLIOZ Normalized: hetlioz |
Drug | Vanda Pharmaceuticals Inc. | $35.50 | 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 |
|---|---|---|---|---|---|---|
| ARISTADA aristada |
2025 | Aristada | 2024 | 23 Beneficiary count suppressed |
exact normalized | Medicare Part D |
| AUSTEDO XR austedo xr |
2025 | Austedo Xr | 2024 | 38 Beneficiary count suppressed |
exact normalized | Medicare Part D |
| CAPLYTA caplyta |
2025 | Caplyta | 2024 | 74 Beneficiary count suppressed |
exact normalized | Medicare Part D |
| FANAPT fanapt |
2025 | Fanapt | 2024 | 36 Beneficiary count suppressed |
exact normalized | Medicare Part D |
| INGREZZA ingrezza |
2025 | Ingrezza | 2024 | 65 Beneficiary count suppressed |
exact normalized | Medicare Part D |
| LYBALVI lybalvi |
2025 | Lybalvi | 2024 | 71 Beneficiary count suppressed |
exact normalized | Medicare Part D |
| REXULTI rexulti |
2025 | Rexulti | 2024 | 239 | exact normalized | Medicare Part D |
| VRAYLAR vraylar |
2025 | Vraylar | 2024 | 46 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 |
|---|---|---|---|---|---|---|
| ABBVIE INC. Exact reporting entity; no affiliate inference |
2025 | VRAYLAR open payments reported associated product |
CMS Open Payments — General Payments 377741 supporting records · 62704 recipient NPIs · example record 1201352550 |
Vraylar · 2024 Exact normalized brand match · 1 Part D row |
46 | suppressed by CMS |
| Alkermes, Inc. Exact reporting entity; no affiliate inference |
2025 | ARISTADA open payments reported associated product |
CMS Open Payments — General Payments 76041 supporting records · 17486 recipient NPIs · example record 1222428566 |
Aristada · 2024 Exact normalized brand match · 1 Part D row |
23 | suppressed by CMS |
| Alkermes, Inc. Exact reporting entity; no affiliate inference |
2025 | LYBALVI open payments reported associated product |
CMS Open Payments — General Payments 93784 supporting records · 20135 recipient NPIs · example record 1222428566 |
Lybalvi · 2024 Exact normalized brand match · 1 Part D row |
71 | suppressed by CMS |
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) Exact reporting entity; no affiliate inference |
2025 | CAPLYTA open payments reported associated product |
CMS Open Payments — General Payments 211855 supporting records · 46143 recipient NPIs · example record 1241243071 |
Caplyta · 2024 Exact normalized brand match · 1 Part D row |
74 | suppressed by CMS |
| Lundbeck LLC Exact reporting entity; no affiliate inference |
2025 | ABILIFY MAINTENA open payments reported associated product |
CMS Open Payments — General Payments 2902 supporting records · 986 recipient NPIs · example record 1251759994 |
Abilify Maintena · 2024 Exact normalized brand match · 1 Part D row |
13 | suppressed by CMS |
| Lundbeck LLC Exact reporting entity; no affiliate inference |
2025 | REXULTI open payments reported associated product |
CMS Open Payments — General Payments 71829 supporting records · 25812 recipient NPIs · example record 1251759986 |
Rexulti · 2024 Exact normalized brand match · 1 Part D row |
239 | 37 |
| Neurocrine BioSciences, Inc. Exact reporting entity; no affiliate inference |
2025 | INGREZZA open payments reported associated product |
CMS Open Payments — General Payments 126456 supporting records · 27390 recipient NPIs · example record 1242766729 |
Ingrezza · 2024 Exact normalized brand match · 1 Part D row |
65 | suppressed by CMS |
| Otsuka America Pharmaceutical, Inc. Exact reporting entity; no affiliate inference |
2025 | ABILIFY MAINTENA open payments reported associated product |
CMS Open Payments — General Payments 27924 supporting records · 10497 recipient NPIs · example record 1227267721 |
Abilify Maintena · 2024 Exact normalized brand match · 1 Part D row |
13 | suppressed by CMS |
| Otsuka America Pharmaceutical, Inc. Exact reporting entity; no affiliate inference |
2025 | NUEDEXTA open payments reported associated product |
CMS Open Payments — General Payments 393 supporting records · 285 recipient NPIs · example record 1227268901 |
Nuedexta · 2024 Exact normalized brand match · 1 Part D row |
57 | suppressed by CMS |
| Otsuka America Pharmaceutical, Inc. Exact reporting entity; no affiliate inference |
2025 | REXULTI open payments reported associated product |
CMS Open Payments — General Payments 160756 supporting records · 46288 recipient NPIs · example record 1227267708 |
Rexulti · 2024 Exact normalized brand match · 1 Part D row |
239 | 37 |
| Teva Pharmaceuticals USA, Inc. Exact reporting entity; no affiliate inference |
2025 | AUSTEDO open payments reported associated product |
CMS Open Payments — General Payments 28 supporting records · 15 recipient NPIs · example record 1247249192 |
Austedo · 2024 Exact normalized brand match · 1 Part D row |
17 | suppressed by CMS |
| Teva Pharmaceuticals USA, Inc. Exact reporting entity; no affiliate inference |
2025 | AUSTEDO XR open payments reported associated product |
CMS Open Payments — General Payments 86263 supporting records · 23643 recipient NPIs · example record 1247244228 |
Austedo Xr · 2024 Exact normalized brand match · 1 Part D row |
38 | suppressed by CMS |
| Vanda Pharmaceuticals Inc. Exact reporting entity; no affiliate inference |
2025 | FANAPT open payments reported associated product |
CMS Open Payments — General Payments 95605 supporting records · 21383 recipient NPIs · example record 1232940535 |
Fanapt · 2024 Exact normalized brand match · 1 Part D row |
36 | suppressed by CMS |
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 |
|---|---|---|---|
| Trazodone Hcl | Trazodone Hcl | 920 | 123 |
| Quetiapine Fumarate | Quetiapine Fumarate | 787 | 82 |
| Divalproex Sodium | Divalproex Sodium | 674 | 73 |
| Divalproex Sodium Er | Divalproex Sodium | 619 | 54 |
| Sertraline Hcl | Sertraline Hcl | 568 | 70 |
| Mirtazapine | Mirtazapine | 454 | 55 |
| Clonazepam | Clonazepam | 370 | 49 |
| Lorazepam | Lorazepam | 369 | 61 |
| Donepezil Hcl | Donepezil Hcl | 363 | 52 |
| Risperidone | Risperidone | 346 | 54 |
| Lamotrigine | Lamotrigine | 335 | 43 |
| Memantine Hcl | Memantine Hcl | 269 | 39 |
| Aripiprazole | Aripiprazole | 251 | 31 |
| Gabapentin | Gabapentin | 247 | 35 |
| Rexulti | Brexpiprazole | 239 | 37 |
| Olanzapine | Olanzapine | 195 | 27 |
| Doxepin Hcl | Doxepin Hcl | 193 | 28 |
| Duloxetine Hcl | Duloxetine Hcl | 181 | 34 |
| Venlafaxine Hcl Er | Venlafaxine Hcl | 174 | 20 |
| Buspirone Hcl | Buspirone Hcl | 172 | 30 |
| Clozapine | Clozapine | 164 | suppressed |
| Hydroxyzine Hcl | Hydroxyzine Hcl | 149 | 28 |
| Escitalopram Oxalate | Escitalopram Oxalate | 134 | 20 |
| Paroxetine Hcl | Paroxetine Hcl | 128 | 15 |
| Fluoxetine Hcl | Fluoxetine Hcl | 127 | 19 |
| Levetiracetam | Levetiracetam | 120 | 17 |
| Naltrexone Hcl | Naltrexone Hcl | 118 | 16 |
| Citalopram Hbr | Citalopram Hydrobromide | 116 | 16 |
| Lurasidone Hcl | Lurasidone Hcl | 114 | 21 |
| Invega Sustenna | Paliperidone Palmitate | 102 | 12 |
| Amantadine | Amantadine Hcl | 96 | suppressed |
| Propranolol Hcl | Propranolol Hcl | 77 | 11 |
| Amitriptyline Hcl | Amitriptyline Hcl | 74 | suppressed |
| Caplyta | Lumateperone Tosylate | 74 | suppressed |
| Prazosin Hcl | Prazosin Hcl | 74 | suppressed |
| Lybalvi | Olanzapine/Samidorphan Malate | 71 | suppressed |
| Bupropion Hcl Sr | Bupropion Hcl | 70 | 11 |
| Ingrezza | Valbenazine Tosylate | 65 | suppressed |
| Bupropion Xl | Bupropion Hcl | 62 | 15 |
| Nuedexta | Dextromethorphan Hbr/Quinidine | 57 | suppressed |
| Carbamazepine | Carbamazepine | 54 | suppressed |
| Benztropine Mesylate | Benztropine Mesylate | 52 | 11 |
| Hydroxyzine Pamoate | Hydroxyzine Pamoate | 52 | 11 |
| Loxapine | Loxapine Succinate | 49 | suppressed |
| Temazepam | Temazepam | 49 | suppressed |
| Clonidine Hcl | Clonidine Hcl | 48 | suppressed |
| Vraylar | Cariprazine Hcl | 46 | suppressed |
| Carbamazepine Er | Carbamazepine | 45 | suppressed |
| Topiramate | Topiramate | 43 | suppressed |
| Lithium Carbonate Er | Lithium Carbonate | 41 | suppressed |
| Austedo Xr | Deutetrabenazine | 38 | suppressed |
| Risperidone Odt | Risperidone | 38 | suppressed |
| Tamsulosin Hcl | Tamsulosin Hcl | 38 | suppressed |
| Fanapt | Iloperidone | 36 | suppressed |
| Lithium Carbonate | Lithium Carbonate | 36 | suppressed |
| Alprazolam | Alprazolam | 34 | suppressed |
| Dextroamphetamine-Amphetamine | Dextroamphetamine/Amphetamine | 34 | suppressed |
| Nortriptyline Hcl | Nortriptyline Hcl | 34 | suppressed |
| Desvenlafaxine Succinate Er | Desvenlafaxine Succinate | 33 | suppressed |
| Belsomra | Suvorexant | 32 | suppressed |
| Guanfacine Hcl | Guanfacine Hcl | 32 | suppressed |
| Memantine Hcl Er | Memantine Hcl | 32 | suppressed |
| Valproic Acid | Valproic Acid (As Sodium Salt) | 31 | suppressed |
| Ziprasidone Hcl | Ziprasidone Hcl | 31 | suppressed |
| Haloperidol | Haloperidol | 30 | suppressed |
| Briviact | Brivaracetam | 29 | suppressed |
| Dayvigo | Lemborexant | 29 | suppressed |
| Chlorpromazine Hcl | Chlorpromazine Hcl | 28 | suppressed |
| Trihexyphenidyl Hcl | Trihexyphenidyl Hcl | 27 | suppressed |
| Methylphenidate Hcl | Methylphenidate Hcl | 26 | suppressed |
| Olanzapine Odt | Olanzapine | 25 | suppressed |
| Trintellix | Vortioxetine Hydrobromide | 24 | suppressed |
| Aristada | Aripiprazole Lauroxil | 23 | suppressed |
| Diazepam | Diazepam | 22 | suppressed |
| Lactulose | Lactulose | 22 | suppressed |
| Atorvastatin Calcium | Atorvastatin Calcium | 21 | suppressed |
| Fluphenazine Hcl | Fluphenazine Hcl | 21 | suppressed |
| Namzaric | Memantine Hcl/Donepezil Hcl | 21 | suppressed |
| Omeprazole | Omeprazole | 21 | suppressed |
| Pantoprazole Sodium | Pantoprazole Sodium | 21 | suppressed |
| Phenytoin Sodium Extended | Phenytoin Sodium Extended | 20 | suppressed |
| Atropine Sulfate | Atropine Sulfate | 19 | suppressed |
| Fluvoxamine Maleate | Fluvoxamine Maleate | 19 | suppressed |
| Lacosamide | Lacosamide | 19 | suppressed |
| Metoprolol Tartrate | Metoprolol Tartrate | 19 | suppressed |
| Oxcarbazepine | Oxcarbazepine | 19 | suppressed |
| Paliperidone Er | Paliperidone | 19 | suppressed |
| Primidone | Primidone | 19 | suppressed |
| Austedo | Deutetrabenazine | 17 | suppressed |
| Fluphenazine Decanoate | Fluphenazine Decanoate | 17 | suppressed |
| Venlafaxine Hcl | Venlafaxine Hcl | 16 | suppressed |
| Abilify Maintena | Aripiprazole | 13 | suppressed |
| Carbidopa-Levodopa | Carbidopa/Levodopa | 13 | suppressed |
| Galantamine Hbr | Galantamine Hbr | 13 | suppressed |
| Vilazodone Hcl | Vilazodone Hcl | 13 | suppressed |
| Constulose | Lactulose | 12 | suppressed |
| Dexmethylphenidate Hcl Er | Dexmethylphenidate Hcl | 12 | suppressed |
| Phenobarbital | Phenobarbital | 12 | suppressed |
| Ramelteon | Ramelteon | 12 | suppressed |
| Depakote Er | Divalproex Sodium | 11 | suppressed |
| Guanfacine Hcl Er | Guanfacine Hcl | 11 | suppressed |
| Invega Trinza | Paliperidone Palmitate | 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 | $935.57 · 42 records | Lundbeck LLC | ARISTADA, AUSTEDO XR, CAPLYTA, FANAPT, HETLIOZ, INGREZZA, LYBALVI, REXULTI, VRAYLAR | 13 | — |
| 2024 | — | — | — | — | Complete |
Questions to ask
Questions you could discuss with your doctor
- What role, if any, does Aristada play in your treatment recommendations for me?
- How do you evaluate evidence when you have a financial relationship with ABBVIE 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