As adolescents with intellectual disability (ID) transition to adulthood, there is a need to plan for effective community-based supports that address the post-school life. There is also a need to plan for the impact of factors (e.g., medical/behavioral support needs) on supports needed for community participation. Data from the "Supports Intensity Scale-Adult Version" ("SIS-A") was used to examine relations between medical/behavior support needs and support needs assessed in the standardized portion of the "SIS-A." Results suggested that the presence of medical/behavioral needs had a strong impact on supports needed to participate in the community activities, and that more intensive medical support needs were related to higher support needs in the Home Living, Community Living, and Health and Safety domains.