Congress remains deeply divided over implementation of the Patient Protection and Affordable Care Act (ACA), the health reform law enacted in March 2010. Since the ACA’s enactment, lawmakers opposed to specific provisions in the ACA or the entire law have repeatedly debated its implementation and considered bills to repeal, defund, delay, or otherwise amend the law. This book summarizes legislative actions taken to repeal, defund, delay, or otherwise amend the ACA since it was enacted; the ACA-related language added to annual appropriations legislation by congressional appropriators since the ACA was signed into law; and all the mandatory appropriations and Medicare trust fund transfers in the ACA and provides details on the status of obligation of these funds.