In order to demonstrate meaningful use, eligible professionals (EPs) who practice in multiple locations will need at least 50 percent of their patient encounters during the reporting period to take place at locations with certified EHR technology. An EP who does not conduct at least 50 percent of their patient encounters in any one practice/location would have to meet the 50 percent threshold through a combination of practices/locations equipped with CEHRT. Eligible professionals who meet this requirement need to calculate their meaningful use data using only patient encounters at locations with certified EHR technology.