Abstract Background Advance Healthcare Directives became legal in Ireland on 26th April 2023. While Advance Healthcare Directives are primarily rooted in patients’ legally binding refusal of treatments or interventions, they also encourage patients to set out their care preferences for the future (Government of Ireland 2015). Despite care of the older adult broadly transitioning from acute hospital to community, and a greater than ever focus on keeping older adults living at home for longer, low awareness of, and professional uncertainty around, Advance Healthcare Directives and how to integrate them into the care of the older adult has been widely expressed by Irish hospital physicians (Crowley and Doran 2022). Methods In this implementation study, Group Concept Mapping, using the relatively novel ‘GroupWisdom™’ software, is used to collect and analyse data from multiple healthcare professions to identify contextual issues that affect the implementation of Advance Healthcare Directives. 44 frontline healthcare professionals including Hospital Consultants (n=6), General Practitioners (n=5), Paramedics (n=7), Advance Nurse Practitioners (n=4), Clinical Nurse Specialists (n=4), Public Health Nurses (n=5), Critical Care Nurses (n=3), Nurse Managers (n=2), Healthcare Managers (n=2), Occupational Therapists (n=2) and Social Workers (n=4) participate in this mixed method study. Policymakers and other stakeholders are also involved throughout. Results The main implementation issues for Advance Healthcare Directives in order of importance as outlined by Healthcare Professionals are: 1) Public Education; 2) Homecare Services; 3) Timing and Location; 4) Family Members; 5) Lack of Education for the Healthcare Professional; 6) Complications for the Healthcare Professional; 7) Individual and Cultural Beliefs. Conclusion This study contributes a valuable understanding of where the implementation issues reside for healthcare professionals and policymakers, and how these can be addressed to ensure successful implementation. This implementation study focuses on practical considerations, offering multiple workable solutions to help to resolve these implementation issues on the ground.