Background and Objectives: Nonpharmacologic interventions have demonstrated benefits for people living with dementia and their caregivers. Few studies have evaluated their implementation in real-world settings. Using normalization process theory (NPT), an implementation science framework, this study evaluated the acceptability of the care of persons with dementia in their environments (COPE) intervention by care managers and interventionists implemented in a Medicaid and state-revenue funded home and community-based services (HCBS) program., Research Design and Methods: NPT and data from 9 care manager focus groups (n = 61) and 2 interventionist focus groups (n = 8) were utilized to understand COPE acceptability to program care managers and interventionists. NPT's 4 criteria, coherence, cognitive participation, collective action, and reflexive monitoring, framed the research questions used to evaluate the intervention's implementation., Results: Care managers and interventionists demonstrated a shared understanding of COPE aims and the value of practices implemented (coherence). Training by national experts facilitated program buy-in to meet COPE goals and was demonstrated by care managers and interventionists as they used the training to broaden their program involvement (cognitive participation). Operational work done by care managers and interventionists to implement the intervention (collective action) and their shared perceptions of program benefits (reflexive monitoring) contributed to program implementation, families' positive responses to COPE and enhanced sustainability., Discussion and Implications: Introducing evidence-based dementia care interventions into HCBS programs strongly depends upon building shared understandings between care managers and interventionists and valuing the contributions of all stakeholders involved in delivering care innovations to people living with dementia and their caregivers., (© The Author(s) 2022. Published by Oxford University Press on behalf of The Gerontological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)