Evaluating a novel online behavioural intervention to encourage cost-conscious strategies among US adults with chronic conditions who are enrolled in a high-deductible health plan: a proof-of-concept pilot study.

Our novel behavioural intervention was acceptable to HDHP enrollees with chronic conditions, feasible to deliver and associated with increased health insurance literacy and confidence in using cost-conscious strategies. This intervention should be tested in a definitive randomised controlled trial that is fully powered to evaluate its effects on cost-related access barriers, out-of-pocket spending and health outcomes in this growing patient population.