The National Center for Health Statistics (NCHS) made a number of changes to the National Health Interview Survey questionnaire in response to new data requirements generated by the need to monitor the impacts of the Affordable Care Act on the health care system.  These changes were first implemented in the 2011 survey, were slightly modified in the 2012 survey, and are intended to be included in future year of the NHIS. SHADAC Issue Brief #34 describes these changes and how they will assist researchers and policymakers monitor and inform health reform.