2025 Medicare Advantage reimbursement rates unchanged, causing 4-9% decline in US health insurers' shares.

US health insurers' shares declined between 4-9% following the CMS' announcement that Medicare Advantage reimbursement rates for providers were unchanged from the initial proposal for 2025, raising fears of a margin squeeze. The CMS expects Medicare Advantage plans to increase by 3.7% on average in 2025, consistent with the January proposal. This announcement led to share price declines for major health insurers, including UnitedHealth Group, Humana, and CVS Health.