A brief self-reported measure of the Personality Assessment Questionnaire for the 11th edition of the World Health Organization's International Classification of Disease (ICD-11) (PAQ-11) was developed to evaluate ICD-11 personality traits. The aim of this study was to investigate the validity of the revised PAQ-11 version (PAQ-11R) with an additional item in the Dissociality domain and thresholds for the severity of personality dysfunction and domains. Study 1 examined the construct validity of the PAQ-11R in 192 university students in Korea. Study 2 estimated tentative reference scores of personality dysfunction and domains of the PAQ-11R in 91 patients in Korea. In study 1, the PAQ-11R had a five-factor structure and the revised Dissociality scale had better convergent and discriminant validities than the previous version. In study 2, the receiver operating characteristic (ROC) curve of the PAQ-11R identified a threshold score of 35. Reference scores for domains were estimated as 15 for Negative Affectivity, 10 for Detachment, 8 for Anankastia, and 5 each for Disinhibition and Dissociality. These scores contribute to severity of personality disturbance but remain qualifiers only; they are not diagnostic. The results suggest that the PAQ-11R is useful as a quick assessment tool for identifying the domains of personality dysfunction in clinical practice in harmony with the ICD-11 guidelines.