Healthcare provider profile · identity verified

Katrina Diederichs, ARNP

Nurse Practitioner · DOVER, NH · NPI 1821023607

Profile state: partd only Open Payments: 2025 Medicare Part D: 2024 Last identity check: 2026-08-10 Page data build: 2026-08-12

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.

Payment overview · 2025

General Payments

We did not find matching Open Payments records for this doctor in the selected program year.

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	410	127
Levothyroxine Sodium	Levothyroxine Sodium	328	95
Lisinopril	Lisinopril	278	75
Amlodipine Besylate	Amlodipine Besylate	269	77
Metoprolol Succinate	Metoprolol Succinate	233	75
Omeprazole	Omeprazole	183	55
Rosuvastatin Calcium	Rosuvastatin Calcium	164	51
Losartan Potassium	Losartan Potassium	146	47
Pantoprazole Sodium	Pantoprazole Sodium	145	39
Gabapentin	Gabapentin	142	40
Hydrochlorothiazide	Hydrochlorothiazide	138	48
Metformin Hcl Er	Metformin Hcl	129	36
Sertraline Hcl	Sertraline Hcl	126	41
Albuterol Sulfate Hfa	Albuterol Sulfate	112	41
Simvastatin	Simvastatin	95	31
Trazodone Hcl	Trazodone Hcl	91	20
Famotidine	Famotidine	78	20
Duloxetine Hcl	Duloxetine Hcl	73	21
Escitalopram Oxalate	Escitalopram Oxalate	71	22
Metformin Hcl	Metformin Hcl	68	22
Eliquis	Apixaban	67	20
Pravastatin Sodium	Pravastatin Sodium	66	22
Fluticasone Propionate	Fluticasone Propionate	65	16
Clonazepam	Clonazepam	63	suppressed
Carvedilol	Carvedilol	60	20
Fluoxetine Hcl	Fluoxetine Hcl	60	17
Atenolol	Atenolol	58	17
Bupropion Xl	Bupropion Hcl	56	14
Trulicity	Dulaglutide	56	suppressed
Furosemide	Furosemide	54	22
Lorazepam	Lorazepam	54	27
Celecoxib	Celecoxib	53	11
Metoprolol Tartrate	Metoprolol Tartrate	52	16
Synthroid	Levothyroxine Sodium	52	17
Tamsulosin Hcl	Tamsulosin Hcl	49	14
Alendronate Sodium	Alendronate Sodium	48	18
Finasteride	Finasteride	47	suppressed
Montelukast Sodium	Montelukast Sodium	46	13
Ozempic	Semaglutide	45	11
Tramadol Hcl	Tramadol Hcl	42	15
Potassium Chloride	Potassium Chloride	41	13
Januvia	Sitagliptin Phosphate	39	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	37	suppressed
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	37	11
Pregabalin	Pregabalin	37	suppressed
Farxiga	Dapagliflozin Propanediol	36	suppressed
Alprazolam	Alprazolam	35	12
Memantine Hcl	Memantine Hcl	35	suppressed
Citalopram Hbr	Citalopram Hydrobromide	32	11
Jardiance	Empagliflozin	32	suppressed
Lovastatin	Lovastatin	31	suppressed
Ropinirole Hcl	Ropinirole Hcl	31	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	30	11
Anoro Ellipta	Umeclidinium Brm/Vilanterol Tr	30	suppressed
Dextroamphetamine-Amphetamine	Dextroamphetamine/Amphetamine	29	suppressed
Valsartan	Valsartan	29	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	27	12
Venlafaxine Hcl Er	Venlafaxine Hcl	27	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	26	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	26	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	25	suppressed
Tresiba Flextouch U-100	Insulin Degludec	25	suppressed
Buspirone Hcl	Buspirone Hcl	24	suppressed
Chlorthalidone	Chlorthalidone	24	suppressed
Clopidogrel	Clopidogrel Bisulfate	24	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	24	suppressed
Nystatin	Nystatin	24	suppressed
Spironolactone	Spironolactone	24	suppressed
Xarelto	Rivaroxaban	24	suppressed
Ramipril	Ramipril	23	suppressed
Topiramate	Topiramate	22	suppressed
Ventolin Hfa	Albuterol Sulfate	22	suppressed
Allopurinol	Allopurinol	21	suppressed
Benazepril Hcl	Benazepril Hcl	21	suppressed
Paroxetine Hcl	Paroxetine Hcl	21	suppressed
Meloxicam	Meloxicam	20	suppressed
Ultra-Fine Short Pen Needle	Pen Needle, Diabetic	20	suppressed
Donepezil Hcl	Donepezil Hcl	19	suppressed
Estradiol	Estradiol	19	suppressed
Lamotrigine	Lamotrigine	19	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	19	suppressed
Prednisone	Prednisone	19	16
Doxycycline Monohydrate	Doxycycline Monohydrate	18	18
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	18	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	18	15
Dextroamphetamine-Amphet Er	Dextroamphetamine/Amphetamine	17	suppressed
Diclofenac Sodium	Diclofenac Sodium	17	suppressed
Glipizide	Glipizide	17	suppressed
Mirtazapine	Mirtazapine	17	suppressed
Mounjaro	Tirzepatide	17	suppressed
Spiriva Handihaler	Tiotropium Bromide	17	suppressed
Temazepam	Temazepam	17	suppressed
Wixela Inhub	Fluticasone Propion/Salmeterol	17	suppressed
Armour Thyroid	Thyroid,pork	16	suppressed
Baclofen	Baclofen	16	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	16	suppressed
Ezetimibe	Ezetimibe	16	suppressed
Irbesartan	Irbesartan	16	suppressed
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	16	suppressed
Tradjenta	Linagliptin	16	suppressed
Glipizide Er	Glipizide	15	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	15	suppressed
Febuxostat	Febuxostat	14	suppressed
Novolin 70-30	Insulin Nph Hum/Reg Insulin Hm	14	suppressed
Fenofibrate	Fenofibrate	13	suppressed
Midodrine Hcl	Midodrine Hcl	13	suppressed
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	13	suppressed
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	13	suppressed
Azelastine Hcl	Azelastine Hcl	12	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	12	suppressed
Ibandronate Sodium	Ibandronate Sodium	12	suppressed
Incruse Ellipta	Umeclidinium Bromide	12	suppressed
Lansoprazole	Lansoprazole	12	suppressed
Nortriptyline Hcl	Nortriptyline Hcl	12	suppressed
Solifenacin Succinate	Solifenacin Succinate	12	suppressed
Advair Hfa	Fluticasone Propion/Salmeterol	11	suppressed
Klor-Con M20	Potassium Chloride	11	suppressed
Meclizine Hcl	Meclizine Hcl	11	suppressed
Praluent Pen	Alirocumab	11	suppressed
Prazosin Hcl	Prazosin Hcl	11	suppressed
Torsemide	Torsemide	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

Methodology version: 2.1

Editorial template version: 2.4

Product contract version: 2.0

Schema version: 0.7.0

Page data build: 2026-08-12T23:34:59.370714+00:00

Publication policy: eligible for indexing after public-launch controls are enabled

Full methodology · Questions & answers · Report a possible error