Health insurers are denying doctor-recommended care, affecting a significant portion of the US population, with reports suggesting that up to 70% or at least 1 in 5 adults have been denied such care. The denials are reportedly causing delays and preventing care for millions of Americans, leading to negative health and financial consequences. The issue has sparked investigations and proposed legislation, including a lawsuit and a bill that would require insurers to disclose claim denials and prior authorization data.