Healthcare provider profile · identity verified

David C Ahern, M.D.

Family Practice · SHREWSBURY, MA · NPI 1720425598

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	658	199
Amlodipine Besylate	Amlodipine Besylate	372	102
Lisinopril	Lisinopril	329	97
Losartan Potassium	Losartan Potassium	241	77
Omeprazole	Omeprazole	229	62
Rosuvastatin Calcium	Rosuvastatin Calcium	185	58
Hydrochlorothiazide	Hydrochlorothiazide	170	51
Oxycodone Hcl	Oxycodone Hcl	163	34
Levothyroxine Sodium	Levothyroxine Sodium	151	45
Tamsulosin Hcl	Tamsulosin Hcl	146	46
Gabapentin	Gabapentin	143	41
Metoprolol Succinate	Metoprolol Succinate	136	36
Lorazepam	Lorazepam	133	42
Pantoprazole Sodium	Pantoprazole Sodium	112	35
Eliquis	Apixaban	99	24
Allopurinol	Allopurinol	94	27
Lovastatin	Lovastatin	92	26
Fluticasone Propionate	Fluticasone Propionate	87	30
Celecoxib	Celecoxib	84	19
Sertraline Hcl	Sertraline Hcl	82	20
Escitalopram Oxalate	Escitalopram Oxalate	80	19
Famotidine	Famotidine	78	28
Metformin Hcl	Metformin Hcl	78	24
Simvastatin	Simvastatin	78	25
Metformin Hcl Er	Metformin Hcl	77	24
Finasteride	Finasteride	69	23
Furosemide	Furosemide	67	28
Trazodone Hcl	Trazodone Hcl	66	27
Spironolactone	Spironolactone	56	18
Prednisone	Prednisone	55	42
Atenolol	Atenolol	54	17
Duloxetine Hcl	Duloxetine Hcl	54	14
Jardiance	Empagliflozin	54	suppressed
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	49	25
Bupropion Xl	Bupropion Hcl	48	19
Carvedilol	Carvedilol	48	14
Ipratropium Bromide	Ipratropium Bromide	46	26
Venlafaxine Hcl Er	Venlafaxine Hcl	46	suppressed
Albuterol Sulfate Hfa	Albuterol Sulfate	43	22
Tramadol Hcl	Tramadol Hcl	42	19
Alprazolam	Alprazolam	41	suppressed
Pravastatin Sodium	Pravastatin Sodium	41	17
Fluoxetine Hcl	Fluoxetine Hcl	40	14
Valsartan	Valsartan	40	15
Metoprolol Tartrate	Metoprolol Tartrate	37	14
Amitriptyline Hcl	Amitriptyline Hcl	36	suppressed
Citalopram Hbr	Citalopram Hydrobromide	36	14
Doxycycline Monohydrate	Doxycycline Monohydrate	36	27
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	36	suppressed
Synthroid	Levothyroxine Sodium	35	suppressed
Oxycontin	Oxycodone Hcl	33	suppressed
Azithromycin	Azithromycin	32	26
Ezetimibe	Ezetimibe	32	12
Montelukast Sodium	Montelukast Sodium	32	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	32	suppressed
Clonazepam	Clonazepam	31	suppressed
Wixela Inhub	Fluticasone Propion/Salmeterol	31	suppressed
Clopidogrel	Clopidogrel Bisulfate	29	suppressed
Alendronate Sodium	Alendronate Sodium	28	12
Meloxicam	Meloxicam	28	suppressed
Diazepam	Diazepam	27	13
Linzess	Linaclotide	27	suppressed
Testosterone	Testosterone	27	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	26	22
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	25	suppressed
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	25	suppressed
Amoxicillin	Amoxicillin	24	14
Glipizide	Glipizide	24	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	24	21
Betamethasone Dipropionate	Betamethasone Dipropionate	23	suppressed
Myrbetriq	Mirabegron	23	suppressed
Nystatin	Nystatin	23	12
Terazosin Hcl	Terazosin Hcl	23	suppressed
Topiramate	Topiramate	23	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	23	16
Valacyclovir	Valacyclovir Hcl	22	13
Cephalexin	Cephalexin	20	12
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	20	18
Paxlovid	Nirmatrelvir/Ritonavir	20	20
Breo Ellipta	Fluticasone/Vilanterol	19	suppressed
Butalbital-Acetaminophen-Caffe	Butalb/Acetaminophen/Caffeine	19	suppressed
Fenofibrate	Fenofibrate	19	suppressed
Ketoconazole	Ketoconazole	19	suppressed
Propranolol Hcl Er	Propranolol Hcl	19	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	19	suppressed
Buspirone Hcl	Buspirone Hcl	18	suppressed
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	18	suppressed
Mounjaro	Tirzepatide	18	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	18	suppressed
Naproxen	Naproxen	17	suppressed
Pregabalin	Pregabalin	17	suppressed
Spironolactone-Hctz	Spironolact/Hydrochlorothiazid	17	suppressed
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	16	suppressed
Carvedilol Er	Carvedilol Phosphate	16	suppressed
Januvia	Sitagliptin Phosphate	16	suppressed
Meclizine Hcl	Meclizine Hcl	16	suppressed
Chlorthalidone	Chlorthalidone	15	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	15	suppressed
Klor-Con M10	Potassium Chloride	15	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	15	suppressed
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	15	suppressed
Ozempic	Semaglutide	15	suppressed
Solifenacin Succinate	Solifenacin Succinate	15	suppressed
Torsemide	Torsemide	15	suppressed
Azelastine Hcl	Azelastine Hcl	14	suppressed
Clonidine Hcl	Clonidine Hcl	14	suppressed
Diclofenac Sodium	Diclofenac Sodium	13	suppressed
Enalapril Maleate	Enalapril Maleate	13	suppressed
Estradiol	Estradiol	13	suppressed
Glipizide Er	Glipizide	13	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	13	suppressed
Lactulose	Lactulose	13	suppressed
Lansoprazole	Lansoprazole	13	suppressed
Nifedipine Er	Nifedipine	13	suppressed
Tamoxifen Citrate	Tamoxifen Citrate	13	suppressed
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	13	suppressed
Ventolin Hfa	Albuterol Sulfate	13	suppressed
Alfuzosin Hcl Er	Alfuzosin Hcl	12	suppressed
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	12	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	12	suppressed
Eplerenone	Eplerenone	12	suppressed
Ibuprofen	Ibuprofen	12	suppressed
Irbesartan	Irbesartan	12	suppressed
Methocarbamol	Methocarbamol	12	suppressed
Xarelto	Rivaroxaban	12	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	11	suppressed
Fluconazole	Fluconazole	11	suppressed
Mometasone Furoate	Mometasone Furoate	11	suppressed
Morphine Sulfate	Morphine Sulfate	11	suppressed
Spiriva Handihaler	Tiotropium Bromide	11	suppressed
Stiolto Respimat	Tiotropium Br/Olodaterol Hcl	11	suppressed
Wegovy	Semaglutide	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