CBO’s analyses of the health care legislation passed during the 111th Congress began in early 2009 and continued past the enactment of the Affordable Care Act (ACA, which consists of P.L. 111-148 as amended by P.L. 111-152) in March 2010. The agency's previous and ongoing work on ACA covers a wide range of topics, some related to specific legislative proposals and some with a broader perspective.