Peltier MR, Sofuoglu M, Petrakis JL, et al. - This study was carried out to evaluate gender differences in opioid use disorder prevalence and multimorbidity nationally in the veteran's health administration. Researchers applied a data set that included all veterans receiving Veterans Health Administration health care during Fiscal Year (FY) 2012 (October 1, 2011, through September 30, 2012), who were diagnosed during the year with opioid dependence or abuse. In this study, 48,408 veterans were diagnosed with opioid use disorder (OUD) during FY 2012, 5.77% of whom were women. Among veterans with OUD, there are substantial gender-specific differences in patterns of multimorbidity, spanning medical, psychiatric, and pain-related diagnoses. The findings indicate the need to view OUD as a multimorbid condition and design interventions to target such multimorbidities. The data demonstrate the potential advantages of gender-specific treatment and prevention efforts among female veterans with OUD and related co-occurring disorders.