Peer interventions have demonstrated efficacy with improving HIV health outcomes. Yet, little is known about factors associated with their uptake into the clinic setting. Three urban sites in the US were funded to adapt, implement and evaluate a peer intervention to improve HIV health outcomes for 173 out of care and newly diagnosed women of color. Peers worked with cis and transgender women of color for four months to achieve the goals of linkage and retention in HIV case management and medical care. Results were 96% of women were linked to medical care, 73% were retained in care and 81% were virally suppressed post 12 months. The average duration of the peer intervention was seven months. Women who received four peer encounters had a 10% increase in retention in care and viral suppression. The findings highlight key elements such as dose and duration of client interaction for peer staff as part of the health care team.