ArticleHealth services research2011
Does medication adherence following a copayment increase differ by disease burden?
Article in Health services research, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers, 1 of them a synthesis that pooled it.
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Who cites it
16 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Pooled it
- Zero Dollar Drug Copay program improves antidiabetic medication adherence and medication use patterns among Blue Cross and Blue Shield of Louisiana members with diabetes in Louisiana.BMJ open diabetes research & care · 2026Article
- Illness Perception and Medication Adherence Trajectories in Patients with Acute Coronary Syndrome: A 6-Month Longitudinal Study.Patient preference and adherence · 2026Article
- Evaluating Financial Incentives as a Tool to Increase Medication Adherence for Patients with Type 2 Diabetes Mellitus: A Systematic Review and Meta-Analysis.Diabetes therapy : research, treatment and education of diabetes and related disorders · 2025Article
- Impact of list price changes on out-of-pocket costs and adherence in four high-rebate specialty drugs.PloS one · 2023Article
- Association Between Copayment Amount and Filling of Medications for Angiotensin Receptor Neprilysin Inhibitors in Patients With Heart Failure.Journal of the American Heart Association · 2022Article
- The distributive fairness of out-of-pocket healthcare expenditure in the Russian Federation.International journal of health economics and management · 2020Article
- Co-payment for Unfunded Additional Care in Publicly Funded Healthcare Systems: Ethical Issues.Journal of bioethical inquiry · 2019Review
- The Effect of Zero Copayments on Medication Adherence in a Community Pharmacy Setting.Innovations in pharmacy · 2019Article
- Improving adherence to high-value medications through prescription cost-sharing policies.BMJ quality & safety · 2018Article
- Effect of Medicaid Policy Changes on Medication Adherence: Differences by Baseline Adherence.Journal of managed care & specialty pharmacy · 2017Article
- High Out-of-Pocket Medical Spending among the Poor and Elderly in Nine Developed Countries.Health services research · 2016Article
- Persistence with secondary prevention medications after acute myocardial infarction: Insights from the TRANSLATE-ACS study.American heart journal · 2015Observational
- Potential bias in medication adherence studies of prevalent users.Health services research · 2013Article
- Cost sharing and decreased branded oral anti-diabetic medication adherence among elderly Part D Medicare beneficiaries.Journal of general internal medicine · 2013Article
- Cost Analysis on Total Cost Incurred (Including Out-of-pocket Expenditure and Social Cost) During Palliative Care in Cases of Head-and-Neck Cancer at a Government Regional Cancer Centre in North India.Indian journal of palliative careArticle
Corrections and comments
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Authors and funding
5 authors.
Funding
Abstract
objectivesTo compare changes in medication adherence between patients with high- or low-comorbidity burden after a copayment increase.
methodsWe conducted a retrospective observational study at four Veterans Affairs (VA) medical centers by comparing veterans with hypertension or diabetes required to pay copayments with propensity score-matched veterans exempt from copayments. Disease cohorts were stratified by Diagnostic Cost Group risk score: low- (<1) and high-comorbidity (>1) burden. Medication adherence from February 2001 to December 2003, constructed from VA pharmacy claims data based on the ReComp algorithm, were assessed using generalized estimating equations.
resultsVeterans with lower comorbidity were more responsive to a U.S.$5 copayment increase than higher comorbidity veterans. In the lower comorbidity groups, veterans with diabetes had a greater reduction in adherence than veterans with hypertension. Adherence trends were similar for copayment-exempt and nonexempt veterans with higher comorbidity.
conclusionMedication copayment increases are associated with different impacts for low- and high-risk patients. High-risk patients incur greater out-of-pocket costs from continued adherence, while low-risk patients put themselves at increased risk for adverse health events due to greater nonadherence.
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