Revising letters to encourage Low-Income Subsidy (LIS) beneficiaries to make an active choice between Medicare Part D prescription drug plans website website

What was the challenge?

Tens of millions of Americans choose health insurance coverage within federal programs that offer a selection of private plans, including the Medicare Part D prescription drug plan. Medicare Part D Low-Income Subsidy (LIS or “Extra Health”) beneficiaries who previously chose a Medicare Part D prescription drug plan on their own and face increased premiums in the future qualify to pay a $0 premium if they switch to a different plan. However, beneficiaries must actively “opt in” to choose to switch plans. We know from the behavioral science literature that, unless otherwise prompted, individuals often stick to the default rather than make an explicit, opt-in choice, even if the default is not the best option for them.

What did we do?

We partnered with the Centers for Medicare and Medicaid Services (CMS) to redesign the LIS Choosers Notice. The notice is sent to beneficiaries whose premium would increase in the following year and who previously chose a Medicare Part D prescription drug plan on their own, meaning that they would have to actively choose a different plan to avoid a premium increase. The redesigned letters framed the decision to mitigate inertia and encourage active choice, made salient the benefits of picking the plan that best fits the recipient, and summarized the key takeaways using simple language and key action steps using easy-to-digest bullets. The Intervention Pack shows the original and redesigned letters, and highlights the best practices adopted in the re-design for effective communications.

What did we learn?

Starting in 2018, CMS mailed the redesigned letters to roughly 1.2 million LIS Choosers, who faced a Part D premium increase for the next year but had the option to make an active choice to switch to a new $0 premium plan. Although we did not conduct a randomized evaluation, CMS usability testing suggested that the revised notice provided greater clarity but did not increase beneficiaries’ intentions to switch.






Health and Human Services



View Intervention Pack (PDF)