The annual Medicare and Social Security trustees' report released Monday showed remarkable savings in the Medicare program demonstrating, in part, the effectiveness of the reforms included in the Affordable Care Act. There a nugget in the report though, ferreted out by Vox's Sarah Kliff, that's potentially groundbreaking: the government looks to be paying less to cover more beneficiaries for hospital insurance than a year ago. Medicare's hospital insurance program — known to wonks as Medicare Part A — spent $266.8 billion covering 50.3 million people in 2012.