Naturalistic developmental behavioral interventions are an empirically supported intervention approach for young autistic children. Despite the prevalence of disruptive behaviors among autistic children, most manualized caregiver-mediated naturalistic developmental behavioral interventions include limited formal guidance on when and how to manage disruptive behavior. The present study sought to characterize how clinicians address disruptive behaviors within the caregiver-mediated naturalistic developmental behavioral intervention, Project ImPACT, the effect of disruptive behavior on Project ImPACT delivery, and the extent to which disruptive behavior impacts social communication outcomes. Data collection was embedded within outpatient early intervention services and included clinicians' report of adaptations to address behavior within the electronic medical record, child social communication outcomes from 124 children and their caregivers, and interviews with certified Project ImPACT coaches and trainers. Results indicate that close to one-third of Project ImPACT sessions included adaptations made to address behavior and regulation. Furthermore, adaptations made to address disruptive behavior were associated with more adaptations to Project ImPACT overall, although behavior adaptations were not associated with child social communication outcomes. Qualitatively, clinicians described using a flexible approach to integrate content and coaching related to behavior and regulation. The present study indicates several future directions for supporting clinicians in addressing behavior and regulation within the naturalistic developmental behavioral intervention framework.