UnitedHealthcare, Humana and Aetna "have bastardized the system and they have ruined Medicare Advantage,” one Republican said.

A single insurer covered at least half of Medicare Advantage enrollees in 44% of counties in 2024, according to a KFF analysis.

Dr. Bruce Siegel, outgoing president and CEO of America's Essential Hospitals, will focus on trying to limit the tax law’s potential damage to providers.

The confirmation of the investigations adds to mounting troubles at UnitedHealth, which has replaced its top executive and withdrawn its guidance.