Payment overview · 2025
General Payments
$426.68
35 reported records · 4 companies
Healthcare provider profile · identity verified
Tammy T Chen, M.D.
Allopathic & Osteopathic Physicians|Psychiatry & Neurology|Psychiatry · ROCK HILL, SC · NPI 1013055706
Verified facts
What the public records show
CMS Open Payments records show Tammy T Chen, M.D. received $426.68 in general payments during 2025 across 35 reported records.
ABBVIE INC. accounted for 53.9% of that reported general-payment amount.
The Open Payments records used for this analysis explicitly named 4 associated products.
A separate comparison found the same explicitly named product in public Medicare Part D data: Ingrezza, 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 109 claims for Vraylar 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 16 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 19 claims for Ingrezza 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 |
|---|---|---|---|---|---|
| ABBVIE INC. | Unresolved — no canonical attribution shown | $230.15 | 53.9% | 24 | 2025 |
| Neurocrine BioSciences, Inc. | Unresolved — no canonical attribution shown | $160.69 | 37.7% | 9 | 2025 |
| Lundbeck LLC | Unresolved — no canonical attribution shown | $20.80 | 4.9% | 1 | 2025 |
| Neos Therapeutics, LP | Unresolved — no canonical attribution shown | $15.04 | 3.5% | 1 | 2025 |
What were the payments for?
Payment categories
| Category | Amount | Records |
|---|---|---|
| Food and Beverage | $426.68 | 35 |
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 |
|---|---|---|---|---|---|
| VRAYLAR Normalized: vraylar |
Drug | ABBVIE INC. | $230.15 | 24 | 2025 |
Source payment records
|
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| INGREZZA Normalized: ingrezza |
Drug | Neurocrine BioSciences, Inc. | $160.69 | 9 | 2025 |
Source payment records
|
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| REXULTI Normalized: rexulti |
Drug | Lundbeck LLC | $20.80 | 1 | 2025 |
Source payment records
|
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| Adzenys XR-ODT Normalized: adzenys xr odt |
Drug | Neos Therapeutics, LP | $15.04 | 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 |
|---|---|---|---|---|---|---|
| INGREZZA ingrezza |
2025 | Ingrezza | 2024 | 19 Beneficiary count suppressed |
exact normalized | Medicare Part D |
| REXULTI rexulti |
2025 | Rexulti | 2024 | 16 Beneficiary count suppressed |
exact normalized | Medicare Part D |
| VRAYLAR vraylar |
2025 | Vraylar | 2024 | 109 | 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 |
109 | 12 |
| 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 |
16 | suppressed by CMS |
| 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 |
19 | 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 |
|---|---|---|---|
| Alprazolam | Alprazolam | 496 | 57 |
| Clonazepam | Clonazepam | 325 | 46 |
| Dextroamphetamine-Amphetamine | Dextroamphetamine/Amphetamine | 311 | 36 |
| Trazodone Hcl | Trazodone Hcl | 283 | 62 |
| Fluoxetine Hcl | Fluoxetine Hcl | 186 | 41 |
| Lorazepam | Lorazepam | 167 | 23 |
| Zolpidem Tartrate | Zolpidem Tartrate | 121 | 23 |
| Duloxetine Hcl | Duloxetine Hcl | 111 | 25 |
| Venlafaxine Hcl Er | Venlafaxine Hcl | 110 | 21 |
| Vraylar | Cariprazine Hcl | 109 | 12 |
| Bupropion Xl | Bupropion Hcl | 108 | 20 |
| Quetiapine Fumarate | Quetiapine Fumarate | 96 | 14 |
| Gabapentin | Gabapentin | 88 | 24 |
| Dextroamphetamine-Amphet Er | Dextroamphetamine/Amphetamine | 82 | 12 |
| Diazepam | Diazepam | 79 | 12 |
| Desvenlafaxine Succinate Er | Desvenlafaxine Succinate | 70 | 13 |
| Aripiprazole | Aripiprazole | 69 | 12 |
| Escitalopram Oxalate | Escitalopram Oxalate | 59 | 15 |
| Temazepam | Temazepam | 57 | suppressed |
| Sertraline Hcl | Sertraline Hcl | 54 | 13 |
| Amitriptyline Hcl | Amitriptyline Hcl | 51 | suppressed |
| Tizanidine Hcl | Tizanidine Hcl | 51 | suppressed |
| Lisdexamfetamine Dimesylate | Lisdexamfetamine Dimesylate | 46 | suppressed |
| Buspirone Hcl | Buspirone Hcl | 43 | suppressed |
| Vyvanse | Lisdexamfetamine Dimesylate | 40 | suppressed |
| Buprenorphine Hcl | Buprenorphine Hcl | 39 | suppressed |
| Mirtazapine | Mirtazapine | 36 | suppressed |
| Benztropine Mesylate | Benztropine Mesylate | 34 | suppressed |
| Propranolol Hcl | Propranolol Hcl | 34 | 11 |
| Olanzapine | Olanzapine | 33 | suppressed |
| Divalproex Sodium Er | Divalproex Sodium | 32 | suppressed |
| Invega Sustenna | Paliperidone Palmitate | 32 | suppressed |
| Topiramate | Topiramate | 32 | suppressed |
| Ziprasidone Hcl | Ziprasidone Hcl | 32 | suppressed |
| Armodafinil | Armodafinil | 27 | suppressed |
| Trintellix | Vortioxetine Hydrobromide | 26 | suppressed |
| Belsomra | Suvorexant | 25 | suppressed |
| Oxcarbazepine | Oxcarbazepine | 25 | suppressed |
| Bupropion Hcl Sr | Bupropion Hcl | 24 | suppressed |
| Citalopram Hbr | Citalopram Hydrobromide | 24 | suppressed |
| Cyclobenzaprine Hcl | Cyclobenzaprine Hcl | 24 | suppressed |
| Lurasidone Hcl | Lurasidone Hcl | 24 | suppressed |
| Xanax | Alprazolam | 24 | suppressed |
| Ondansetron Odt | Ondansetron | 21 | suppressed |
| Lamotrigine | Lamotrigine | 20 | suppressed |
| Ingrezza | Valbenazine Tosylate | 19 | suppressed |
| Methylphenidate Hcl | Methylphenidate Hcl | 19 | suppressed |
| Atomoxetine Hcl | Atomoxetine Hcl | 18 | suppressed |
| Vilazodone Hcl | Vilazodone Hcl | 18 | suppressed |
| Eszopiclone | Eszopiclone | 17 | suppressed |
| Prazosin Hcl | Prazosin Hcl | 17 | suppressed |
| Zolpidem Tartrate Er | Zolpidem Tartrate | 17 | suppressed |
| Hydroxyzine Pamoate | Hydroxyzine Pamoate | 16 | suppressed |
| Rexulti | Brexpiprazole | 16 | suppressed |
| Methylphenidate Er | Methylphenidate Hcl | 15 | suppressed |
| Asenapine Maleate | Asenapine Maleate | 14 | suppressed |
| Risperdal | Risperidone | 14 | suppressed |
| Buprenorphine-Naloxone | Buprenorphine Hcl/Naloxone Hcl | 12 | suppressed |
| Clomipramine Hcl | Clomipramine Hcl | 12 | suppressed |
| Clozapine | Clozapine | 12 | suppressed |
| Hydroxyzine Hcl | Hydroxyzine Hcl | 12 | suppressed |
| Paroxetine Hcl | Paroxetine Hcl | 12 | suppressed |
| Promethazine Hcl | Promethazine Hcl | 12 | suppressed |
| Methocarbamol | Methocarbamol | 11 | suppressed |
| Nuedexta | Dextromethorphan Hbr/Quinidine | 11 | suppressed |
| Saphris | Asenapine Maleate | 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 | $426.68 · 35 records | ABBVIE INC. | Adzenys XR-ODT, INGREZZA, REXULTI, VRAYLAR | 3 | — |
| 2024 | — | — | — | — | Complete |
Questions to ask
Questions you could discuss with your doctor
- What role, if any, does Ingrezza 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