To amend title XVIII of the Social Security Act to establish a full risk ACO program.

This bill establishes a permanent full risk Accountable Care Organization (ACO) program within Medicare to allow groups of healthcare providers to coordinate care and assume financial responsibility for the costs of treating traditional Medicare beneficiaries. The program creates two specific tracks: a standard track for general patient populations and a complex care track designed for patients with six or more chronic conditions, each with different minimum patient enrollment requirements. Participating organizations would receive payments based on a fixed budget per patient rather than individual service fees, sharing any savings or losses with the government while being exempt from certain existing quality reporting requirements. Providers can form these groups through various arrangements, including partnerships between hospitals and individual practices, and must ensure patients have the option to opt out of the program.