Objectives This study examined the admission type and its related factors among patients with psychotic disorders defined based on the revised mental health welfare law. Methods This study was conducted on a total of 100 patients diagnosed on the schizophrenia spectrum and other psychotic disorders. The admission type and sociodemographic characteristics were examined. Social support, psychopathology, excitement, insight, and social functioning were evaluated using the Social Support Scale, Positive and Negative Syndrome Scale (PANSS), PANSS excitement component, Brief Psychiatric Rating Scale, Global Assessment Functioning Scale, Strauss-Carpenter scale, Korean version of the Scale to Assess Unawareness of Mental Disorder, and Korean version of Beck Cognitive Insight Scale. Results The severity of psychotic symptoms, excitement, social functioning, and insight were significantly different between involuntary and voluntary admissions (p<0.05). Excitement and insight were found to be factors affecting the admission type (p<0.05). Conclusion Excitement and insight were factors mainly accounting for the admission type in patients with psychotic disorder. This study could be helpful in improving clinical decision-making and community mental health care.