ABSTRACT Traumatic brain injury (TBI) is a leading cause of death and disability among older adults. Currently, there is a lack of evidence to inform long-term care management of TBI in older adults. Once older adults return to their community, it is unclear what type of rehabilitation services are received in the community setting. Significant research has been conducted regarding the care received during inpatient rehabilitation and skilled nursing facility care; however, it is unclear what type of home health and outpatient rehabilitation services are provided to this growing population. Furthermore, social determinants of health (SDoH) are not well understood, as well as their impact on utilization of rehabilitation services. Therefore, this Mentored Research Scientist Development Award (K01) administrative supplement will extend the work done in the parent grant to understand what rehabilitation services are provided to older adults once discharged to community and whether differences in utilization are driven by SDoH. Dr. Pappadis is committed to conducting health disparities research and is an advocate for diversity, equity, inclusion, and accessibility (DEIA). This supplement will be used to address the following aims: (1) Characterize the utilization of rehabilitation services during home health care or outpatient care in older adults with TBI following discharge to the community, and (2) Examine the association between social determinants of health (SDoH) and utilization of rehabilitation services during home health care or outpatient care in older adults with TBI following discharge to the community. In addition, Dr. Pappadis will work with two student trainees who are interested in health disparities and rehabilitation care delivery among older adults with TBI. During the supplement period, Dr. Pappadis, the student trainees, and a network of rehabilitation professionals within a large rehabilitation medicine organization will develop learning modules on inclusive mentoring for mentors and mentees. Dr. Pappadis will also attend workshops and trainings to enhance her experiences in DEIA leadership and mentoring to improve the mentor-mentee relationship and research environment for both. The findings from the work, as well as the developed learning modules, will be disseminated within and outside of the institution in collaboration with the student trainees.