With growing interest in and use of administrative data to study populations of interest, there is a need to ensure that those populations are easily identified in such data. Our new study reveals that modern terminology is not consistently used in health records to identify presence of an IDD. Just under 1% of the home care population had a diagnostic entry related to IDD. Ambiguous terms were most commonly used (61%), and this group tended to be older and less impaired than the group with more acceptable terms used to describe their IDD. See the full study here: https://bit.ly/2DiLIEV