PROBLEM: Adolescents and young adults with chronic illnesses continue to face barriers as they transition from pediatric to adult care. An evidence map can help to identify gaps in the transition literature to determine targets for future research. ELIGIBILITY CRITERIA: We searched PubMed, CINAHL, PsycInfo, and Cochrane for systematic reviews published through February 2018. Eligible reviews included at least one comparative study testing a youth-focused intervention for improving transition with at least one quantitative health-related outcome reported. SAMPLE: We identified 431 unique reviews in our search, and 37 reviews (containing 71 eligible primary studies) met inclusion criteria. RESULTS: Most reviews (20 of 37) summarized some aspect of transition across diagnoses. Type 1 diabetes was the most common diagnosis studied (7 of 37 reviews and 24 of 71 primary studies). Only 14 of 71 primary studies focused on care after transfer to adult care. CONCLUSIONS: The literature on interventions to improve transition to adult care has focused on a limited number of diagnoses, most commonly Type 1 diabetes. Common pediatric conditions, such as asthma, have not been studied with regard to transition. Efforts have been mainly targeted on transition preparation, with less focus on transition needs after transfer to adult care. IMPLICATIONS: There is a need for transition research focused on common pediatric conditions and transition needs after transfer to adult care.