Cigna Corporation is considering the sale of its Medicare Advantage business, which could be worth billions. The decision comes after a decade of expansion in the sector and may be a response to a challenging reimbursement environment. Profit margins have fallen short of Cigna's 4% to 5% target, and changes to the government's star rating system are expected to decrease the ratings of Cigna's Medicare Advantage plans in 2024. Despite this, Cigna has expanded its Medicare Advantage footprint, now covering over 40% of eligible individuals.