Plaintiffs' lawyers are seeking to consolidate six cases against UnitedHealth, stemming from a cyberattack on Change Healthcare, a subsidiary of UnitedHealth Group, which built a natural monopoly in claim processing. Described as the 'biggest cyber attack on the US health care system,' a Russian-speaking ransomware group named Blackcat allegedly stole sensitive medical records. The lawsuits allege UnitedHealth failed to protect millions of people's personal data. Option Care Health warned the hack may impact its financials, and a doctor affected by the attack said recovery could take months. The US government is investigating whether Change Healthcare complied with laws protecting patient data, with the Federal Office of Civil Rights also investigating. The attack has caused significant disruptions, affecting hospitals, pharmacies, and medical groups' ability to process insurance billing and payments. Three-quarters of hospitals reported a direct impact on patient care, and 94% experienced financial impacts. Medical providers have filed class action lawsuits against Change Healthcare over the data breach, and US officials are expected to meet with health insurers to discuss assistance for affected medical practices. Senators are seeking answers from the Biden administration regarding the cyberattack.