The Patient Protection and Affordable Care Act was a bill in the United States. It was signed into law by President Barack Obama on March 23, 2010. It is also known as Obamacare. The law addresses health insurance coverage, health care costs, and preventive care. The law was enacted in two parts: The Patient Protection and Affordable Care Act was signed into law on March 23, 2010 and was amended by the Health Care and Education Reconciliation Act on March 30, 2010.