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Background Adolescents and young adults (AYA) with HIV experience worse health outcomes than adults with HIV in the United States. Little is known about AYA patterns of utilization of costly healthcare resources. Methods We estimated utilization of outpatient, emergency department (ED), and inpatient care among 13–30 year-olds from 2006–2015. We stratified outpatient visits, ED visits and inpatient days per person-year (PY) by transmission mode (perinatal (PHIVY), non-perinatal (NPHIVY), age (13–17, 18–23, 24–30 years), CD4 strata (&lt; 200, 200–499, ≥ 500 cells/µL) and presence or absence of viral load (VL) suppression (&lt;, ≥ 400 copies/mL[c/mL]) combined with antiretroviral (ARV) use. We also quantified outpatient, ED, and inpatient care associated with specific AIDS-defining conditions. Results Among 4,450 AYA (PHIVY: 15%; NPHIVY: 85%), mean (SD) follow-up was 2.8 years (2.5) [PHIVY: 4.2 years (3.1); NPHIVY: 2.5 years (2.3)]. Mean age was 21.4 years (PHIVY: 16.9 years; NPHIVY: 22.3 years) and female sex was 28% (PHIVY: 52%; NPHIVY: 23%). Among PHIVY, most person-time (PT) was spent between ages 13–23 years (13–17 years: 43%; 18–23 years: 45%), CD4 ≥ 500/µL (61%), and VL &lt; 400 c/mL (69%). Among NPHIVY, most PT was spent between ages 24 and 30 years (56%), CD4 ≥ 500/µL (54%), and VL &lt; 400 c/mL (66%). PT spent while prescribed ARVs and VL ≥ 400 c/mL was 30% (PHIVY) and 24% (NPHIVY). For both PHIVY and NPHIVY, outpatient visit rates were higher at younger ages (13–17 years and 18–23 years), lower CD4 (&lt; 200, 200–499/µL), and among those prescribed ARVs (Figure 1). Rates of ED visits and inpatient days were higher during PT spent at older ages (18–23 years, 24–30 years), lower CD4 (&lt; 200, 200–499/µL), and VL ≥ 400 c/mL (Figures 2 and 3). Overall, utilization was higher among PHIVY than NPHIVY (outpatient: 12.1 vs. 6.0/PY; ED: 0.4 vs. 0.3/PY; inpatient: 1.5 vs. 0.8/PY). The overall rate of AIDS-defining conditions was 4.5/100 PY (Figure 4). Conclusion Among AYA with HIV, more ED visits and inpatient days were observed during time spent at older ages, lower CD4 counts, and VL ≥ 400 c/mL. While AIDS-defining conditions were rare, associated resource utilization was substantial. Interventions to improve retention in care, virologic suppression, and immune response may improve outcomes, and thus decrease costly resource utilization, for AYA with HIV as they transition to adulthood. Disclosures All authors: No reported disclosures.

2520. Resource utilization in adolescents and young adults with HIV in the HIV Research Network