BackgroundThe role of rural family physicians continues to evolve to accommodate the comprehensive care needs of aging societies. For older individuals in rural areas, rehabilitation is vital to ensure that they can continue to perform activities of daily living. In this population, a smooth discharge following periods of hospitalization is essential and requires management of multimorbidity, and rehabilitation therapists may require support from family physicians to achieve optimal outcomes. Therefore, this study aimed to investigate changes in the roles of rural family physicians in patient rehabilitation.MethodsAn ethnographic analysis was conducted with rural family physicians and rehabilitation therapists at a rural Japanese hospital. A constructivist grounded theory approach was applied as a qualitative research method. Data were collected from the participants via field notes and semi-structured interviews.ResultsUsing a grounded theory approach, the following three themes were developed regarding the establishment of effective interprofessional collaboration between family physicians and therapists in the rehabilitation of older patients in rural communities: 1) establishment of mutual understanding and the perception of psychological safety; 2) improvement of relationships between healthcare professionals and their patients; and 3) creation of new roles in rural family medicine to meet evolving needs.ConclusionEnsuring continual dialogue between family medicine and rehabilitation departments helped to establish understanding, enhance knowledge, and heighten mutual respect among healthcare workers, making the work more enjoyable. Continuous collaboration between departments also improved relationships between professionals and their patients, establishing trust in collaborative treatment paradigms and supporting patient-centered approaches to family medicine. Within this framework, understanding the capabilities of family physicians can lead to the establishment of new roles for them in rural hospitals. Family medicine plays a vital role in geriatric care in community hospitals, especially in rural primary care settings. The role of family medicine in hospitals should be investigated in other settings to improve geriatric care and promote mutual learning and improvement among healthcare professionals.