UnitedHealth and Humana shares dropped over 10% in after-hours trading on Monday following the Trump administration's proposal to reduce Medicare payment increases. This dramatic plunge reflects investor concerns about the financial impact on these major health insurers, which rely heavily on government healthcare programs. The proposed cuts could lead to reduced revenues and profit margins, posing challenges for these companies' growth strategies.

Investors are eying the potential ripple effects across the healthcare sector. UnitedHealth, the largest US health insurer, and Humana, a major player in Medicare Advantage plans, are particularly vulnerable. The proposal could force these companies to reassess their business models and potentially seek new revenue streams to offset the expected losses. Market analysts predict a shift in focus towards cost-cutting measures and exploration of private health insurance markets.

The administration's plan aims to curb rising healthcare costs by adjusting payment rates. However, the move has sparked debate over its potential to destabilize the health insurance market. Some experts argue that reduced payments could strain insurers' ability to provide comprehensive coverage, potentially leading to higher premiums for consumers. As the proposal moves through regulatory channels, investors and industry leaders will watch closely for any signs of compromise or revision.