Partner Plan Choices and Medicare Advantage Enrollment Decisions Among Older Adults.

In 2023, 50% of Medicare beneficiaries were enrolled in Medicare Advantage (MA).1 While enrollment is common, so is disenrollment: between 2011 and 2018, 12% to 20% of enrollees left their MA contract within 1 year.2 Beneficiary- and plan-level characteristics, including Medicare-Medicaid dual eligibility, functional limitations, health care needs, and plan star rating, are associated with disenrollment.3-6 For working-age adults, spouses or partners (hereafter, partners) often share insurance coverage under the same plan; whether this pattern occurs in MA is unknown. This study considered dyadic MA enrollment decisions, examining the association of respondent plan changes with partner plan changes and other beneficiary and plan characteristics.