The aim of this scoping review is to identify barriers and facilitators that affect families with children with neurodevelopmental disorders (NDDs) in accessing primary, rehabilitation (intervention) services and specialist health care services and their availability in crises. Ten peer-reviewed studies conducted in different regions of the world during the COVID-19 pandemic and an armed conflict were reviewed. The selection of articles was carried out according to the inclusion and exclusion criteria based on PEO approach. Data were extracted and analysed by thematic categories according to Bronfenbrenner’s ecological model. In most studies, key barriers were lack of information about available services, financial difficulties, geographical isolation, excessive psycho-emotional stress of parents, and a gap in the availability of qualified professionals for diagnosis and provision of rehabilitation services. Mitigating factors included telemedicine and remote consultations, community support and high parental involvement. Further research should focus more on different types of crises (military, natural) and search for new approaches in delivering healthcare to children with NDD in challenging circumstances.