Methods summary: Health departments will generate an out-of-care list using HIV laboratory surveillance data; collaborating clinics will concurrently generate out-of-care lists using appointment data. The combined out-of-care list will be reconciled by the health department and clinics, and discussed at monthly case conferences. All individuals determined to be out-of care will be randomized to receive either: (1) usual linkage and engagement in care services (standard of care [SOC]); or (2) an active health department field services intervention in addition to SOC. The active intervention activities will vary among jurisdictions; however all sites will include field services to locate, contact, and provide assistance, including a same-day appointment, to access HIV medical care.