Participants will be recruited from their regularly scheduled HIV care appointments at the CCP at which current viral load and CD4 counts are evaluated. Any HIV+ patient with a substance use disorder will be told by their CCP doctor about our research study and given a recruitment flyer that explains the benefits of participation. If they express interest, the doctor will immediately contact the CCP Medical Case Manager who is in charge of study recruitment and assessment (hereafter, outreach coordinator). The outreach coordinator will briefly explain the intake interview process and basic purpose of the study. If the patient agrees to move forward they will begin with a formal consent process. During this process, the outreach coordinator will read the consent form aloud in its entirety while the participant follows along. After signing the consent form, the patient will proceed immediately to the intake interview unless their schedule precludes it, in which case they will provide contact information and schedule the intake interview for a time on the next day or as soon as possible. Participants who have signed consent but who have not returned to CCP will be given reminder calls related to their scheduled intake interview. They will also receive follow up calls if they fail to show up for their scheduled appointment time.