UnitedHealth Group, through its subsidiary Change Healthcare, has faced a cyberattack resulting in over $2 billion in advanced payments to healthcare providers. The company is testing the restored claims platform, with ongoing concerns about the impact on healthcare services and financial assistance provided. Federal officials and industry executives were aware of vulnerabilities but failed to prevent the attack, leading to disruptions in medical treatment, billing, and pharmacy claims. The US government has launched an investigation into UnitedHealth.